OCT scanning method

Abstract

The application relates to an OCT scanning method. The method comprises the following steps: acquiring a target scanning line group for an eye to be examined, the target scanning line group comprising a plurality of scanning line groups, each of the scanning line groups comprising a block scanning group and an encoding scanning group; for any scanning line group in the target scanning line group, scanning the eye to be examined based on each scanning line in the block scanning group in the scanning line group, and scanning a preset position based on the encoding scanning group in the scanning line group when valid information of first scanning data corresponding to the block scanning group is determined; and determining target scanning data of each scanning line group according to the first scanning data of each scanning line group and the valid information of the first scanning data. The method can effectively improve the efficiency of OCT scanning.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of OCT technology, and particularly to an OCT scanning method. BACKGROUND

[0002] Optical coherence tomography (OCT) is a three-dimensional tomographic imaging technology. Based on OCT, a user's eye under examination can be scanned to obtain a three-dimensional image of the user's eye under examination.

[0003] In the prior art, the eye under examination is usually divided into multiple regions, and each region is scanned based on OCT. Finally, a three-dimensional image of the user's eye under examination is determined based on the scanning data of each region.

[0004] However, this scanning method has poor safety and long scanning time, which leads to poor efficiency of OCT scanning. SUMMARY

[0005] Therefore, it is necessary to provide an OCT scanning method with high efficiency to solve the above technical problems.

[0006] In a first aspect, the present application provides an OCT scanning method, comprising:

[0007] obtaining a target scan line group for an eye under examination, the target scan line group comprising a plurality of scan line groups, each scan line group comprising a block scan group and an encoding scan group;

[0008] for any scan line group in the target scan line group, scanning the eye under examination based on each scan line in the block scan group in the scan line group, and when determining valid information of first scanning data corresponding to the block scan group, scanning a preset position based on the encoding scan group in the scan line group;

[0009] determining target scanning data of each scan line group according to the first scanning data of each scan line group and the valid information of the first scanning data.

[0010] In one embodiment, the method further comprises: obtaining scanning order information of each scan line group in the target scan line group; and setting the number of scan lines of the encoding scan group in each scan line group according to the scanning order information.

[0011] In one embodiment, the determining target scanning data of each scan line group according to the first scanning data of each scan line group and the valid information of the first scanning data comprises: determining second scanning data of each scan line group according to the valid information of the first scanning data of each scan line group; and determining target scanning data of each scan line group according to the first scanning data and the second scanning data of each scan line group. Draw Draw ​The target scanning data of each of the scanning line groups is determined according to the first scanning data of each of the scanning line groups and the valid information of the first scanning data.

[0012] In one of the embodiments, after each scanning line in the block scanning group in the scanning line group scans the eye to be examined, the method further comprises determining scanning order information of the scanning line group, and when the scanning order information is determined, scanning the preset position based on the coded scanning group in the scanning line group; and the target scanning data of each of the scanning line groups is determined according to the first scanning data of each of the scanning line groups, the valid information of the first scanning data and the scanning order information.

[0013] In one of the embodiments, the target scanning data of each of the scanning line groups is determined according to the first scanning data of each of the scanning line groups, the valid information of the first scanning data and the scanning order information, comprising: obtaining initial scanning data of the coded scanning group in each of the scanning line groups, and integrating the valid information of the first scanning data of each of the scanning line groups, the scanning order information and the initial scanning data to obtain second scanning data of each of the scanning groups; and determining the target scanning data of each of the scanning line groups according to the second scanning data of each of the scanning groups and the first scanning data of each of the scanning groups.

[0014] In one of the embodiments, the valid information of the first scanning data corresponding to the block scanning group is determined, comprising: determining the motion amount of the eye to be examined in the scanning process of the block scanning group; determining the valid information as invalid when the motion amount is greater than a preset motion amount threshold; and determining the valid information as valid when the motion amount is less than the preset motion amount threshold.

[0015] In one of the embodiments, the second scanning data of each of the scanning line groups is determined according to the valid information of the first scanning data of each of the scanning line groups, comprising: obtaining the valid information of the first scanning data of each of the scanning line groups and the initial scanning data of the coded scanning group in each of the scanning line groups; and integrating the valid information and the initial scanning data to obtain the second scanning data of each of the scanning groups.

[0016] In one of the embodiments, the method further comprises: if the valid information indicates that the first scanning data is invalid, performing again the step of scanning the eye to be examined based on each scanning line in the block scanning group in the scanning line group until the valid information indicates that the first scanning data corresponding to the block scanning group is valid; and performing the step of scanning the eye to be examined based on each scanning line in the block scanning group in the next scanning line group after the valid information indicates that the first scanning data is valid.

[0017] In one of the embodiments, the method further comprises: determining a three-dimensional image of the eye under examination according to the target scan data of each scan line group.

[0018] In one of the embodiments, the determining a three-dimensional image of the eye under examination according to the target scan data of each scan line group comprises: performing splicing processing on the first scan data in the target scan data of each scan line group according to the second scan data in the target scan data of each scan line group, to obtain the three-dimensional image.

[0019] In one of the embodiments, the performing splicing processing on the first scan data in the target scan data of each scan line group according to the second scan data in the target scan data of each scan line group, to obtain the three-dimensional image, comprises: determining valid information of the first scan data in the target scan data of each scan line group according to the second scan data in the target scan data of each scan line group, and performing filtering processing on the first scan data in the target scan data of each scan line group according to the valid information, to obtain the first scan data after filtering processing; determining scan sequence information of each scan line group according to the second scan data in the target scan data of each scan line group, and determining sorting information of the first scan data in the target scan data of each scan line group according to the scan sequence information of each scan line group; performing splicing processing on the first scan data after filtering processing according to the sorting information, to obtain the three-dimensional image.

[0020] In a second aspect, the present application further provides an OCT scanning device, comprising:

[0021] an acquisition module, configured to acquire a target scan line group for an eye under examination, the target scan line group comprising a plurality of scan line groups, each scan line group comprising a block scan group and an encoding scan group;

[0022] an execution module, configured to, for any scan line group in the target scan line group, perform scanning on the eye under examination based on each scan line in the block scan group in the scan line group, and perform scanning on a preset position based on the encoding scan group in the scan line group when valid information of first scan data corresponding to the block scan group is determined;

[0023] a determination module, configured to determine target scan data of each scan line group according to the first scan data of each scan line group and the valid information of the first scan data.

[0024] In a third aspect, the present application further provides a computer device, comprising a memory and a processor, the memory storing a computer program, and the processor implementing the steps of the method in any of the embodiments of the first aspect when executing the computer program.

[0025] In a fourth aspect, the present application also provides a computer readable storage medium, having stored thereon a computer program, which, when executed by a processor, implements the steps of the method according to any one of the embodiments of the first aspect.

[0026] In a fifth aspect, the present application also provides a computer program product, comprising a computer program which, when executed by a processor, implements the steps of the method according to any one of the embodiments of the first aspect.

[0027] The OCT scanning method, device, computer device, computer readable storage medium and computer program product described above first acquire a target scanning line group for the eye under examination, the target scanning line group comprising a plurality of scanning line groups, each of the scanning line groups comprising a block scanning group and an encoding scanning group; for any scanning line group in the target scanning line group, each scanning line in the block scanning group in the scanning line group is used to scan the eye under examination, and when valid information of first scanning data corresponding to the block scanning group is determined, the preset position is scanned based on the encoding scanning group in the scanning line group. Since the preset position can be scanned based on the encoding scanning group when the valid information of the first scanning data corresponding to the block scanning group is determined, compared with the prior art, after performing a block scan, the scanning is stopped, and after the valid information corresponding to the block scan is determined, the next block scan is performed, which can not only avoid the problem of low scanning safety caused by the long time of the scanning light staying in the same area of the eye under examination, but also avoid the problem of long scanning time caused by the long stabilization time required for restarting the scanning after stopping the scanning, thereby effectively improving the efficiency of the OCT scanning. Moreover, since the number of times of starting the device can be reduced, the probability of mechanical damage of the device is reduced, and the service life of the device can be prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the drawings needed to be used in the description of the embodiments of the present application or the related art will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other related drawings can also be obtained without creative labor.

[0029] Figure 1 A flowchart of the OCT scanning method in one embodiment;

[0030] Figure 2 A flowchart of the OCT scanning method in another embodiment;

[0031] Figure 3 A flowchart of the method for determining the target scanning data of each scanning line group in one embodiment;

[0032] Figure 4 a flowchart of a method for determining the first scan data in an embodiment;

[0033] Figure 5 a flowchart of a method for determining the second scan data of each scan line group in an embodiment;

[0034] Figure 6 a flowchart of an OCT scanning method in another embodiment;

[0035] Figure 7 a flowchart of a method for determining a three-dimensional image in an embodiment;

[0036] Figure 8 a structural block diagram of an OCT scanning device in an embodiment;

[0037] Figure 9 an internal structural diagram of a computer device in an embodiment;

[0038] Figure 10 a schematic diagram of a target scan line group in an embodiment;

[0039] Figure 11 a schematic diagram of encoding the number of scan lines of a scan group in an embodiment. DETAILED DESCRIPTION

[0040] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0041] Optical coherence tomography (OCT) is a three-dimensional tomographic imaging technology. Based on OCT, a user's eye under examination can be scanned to obtain a three-dimensional image of the user's eye under examination.

[0042] In the prior art, the eye under examination is usually divided into multiple regions, and each region is scanned based on OCT. Finally, a three-dimensional image of the user's eye under examination is determined based on the scan data of each region.

[0043] However, this scanning method not only has poor safety, but also has a long scanning time, thereby resulting in poor efficiency of OCT scanning.

[0044] Specifically, in the prior art, after a region is scanned based on OCT, the scanning needs to be stopped until the movement amount of the examined eye in the scanning process is determined, and then the scanning of the next region is started. During the stopping of the scanning, the scanning light remains static, and the long-time stay of the scanning light at a certain position of the examined eye can easily cause cell damage of the examined eye, thereby causing a safety problem. Moreover, the OCT needs a long stabilization time during the stopping of the scanning to the restarting of the scanning, which not only leads to a long scanning time, but also easily causes mechanical damage and other problems, thereby causing a poor efficiency of the OCT scanning.

[0045] Therefore, the present application provides an OCT scanning method. While determining the valid information of the first scanning data corresponding to the block scanning group, the preset position is scanned based on the encoding scanning group. Compared with the prior art, after the block scanning is performed once, the scanning is stopped, and after the valid information corresponding to the block scanning is determined, the next block scanning is performed. The present application can not only avoid the problem of long-time stay of the scanning light at the same region of the examined eye, thereby causing low scanning safety, but also avoid the problem of long stabilization time required for restarting the scanning after the stopping of the scanning, thereby causing a long scanning time. Therefore, the efficiency of the OCT scanning is effectively improved. Moreover, the number of times of starting the device is reduced, the probability of mechanical damage of the device is reduced, and the service life of the device is prolonged.

[0046] The scanning method provided by the present application can be performed by a computer device, which can be a terminal, and the terminal can be a device combined with an OCT and a processor.

[0047] In an exemplary embodiment, as shown in Figure 1 An OCT scanning method is provided, which includes the following steps:

[0048] In step 101, a target scanning line group for an examined eye is acquired.

[0049] The target scanning line group includes a plurality of scanning line groups, and each scanning line group includes a block scanning group and an encoding scanning group.

[0050] As described above, when the examined eye is scanned based on the OCT, the examined eye can be divided into a plurality of regions, and each region is scanned based on the OCT. When any region in the plurality of regions is scanned based on the OCT, the set of scanning lines used is the block scanning group.

[0051] It can be understood that, before the examined eye is scanned, the examined eye can be divided to obtain a plurality of block regions, each block region corresponding to a block scanning group, and each block scanning group including at least one scanning line for scanning the block region.

[0052] Further, the present application does not limit the scan protocol of each block scan group, which can be a star scan protocol, a block scan protocol, a linear scan protocol, a radial scan protocol, etc. It should be noted that the block scan group in the present application is a set of scan lines for scanning a certain region of the eye, and is not a scan group using a block scan protocol.

[0053] Optionally, the encoding scan group is a scan group set by the technician according to actual needs, and the scan lines it contains and the scan protocol it uses can all be set by the technician according to actual needs.

[0054] Step 102, for any scan line group in the target scan line group, scan the eye based on each scan line in the block scan group in the scan line group, and when determining the valid information of the first scan data corresponding to the block scan group, scan the preset position based on the encoding scan group in the scan line group.

[0055] Optionally, the first scan data can be the scan data obtained after scanning the eye based on each scan line in the block scan group. The first scan data can be B-scan data, and can also be raw data.

[0056] The valid information can be used to represent the validity of the first scan data. Since there are various factors affecting the quality of the first scan data in the process of scanning the eye based on each scan line in the block scan group in the scan line group to obtain the first scan data. For example, the motion of the eye during scanning, the failure of the optical element of the OCT, and the transmission interference of the first scan data, etc.

[0057] Therefore, in some exemplary embodiments, for any scan line group in the target scan line group, after scanning the eye based on each scan line in the block scan group in the scan line group, the valid information of the first scan data corresponding to the block scan group can be determined first.

[0058] Specifically, the valid information of the first scan data can be determined according to the quality of the first scan data. For example, in the case where the quality of the first scan data meets the preset condition, it can be determined that the valid information of the first scan data is valid; in the case where the quality of the first scan data does not meet the preset condition, it can be determined that the valid information of the first scan data is invalid.

[0059] Further, while determining the valid information of the first scan data, the preset position can be scanned based on the encoding scan group in the scan line group, so that the OCT device will not pause scanning, and thus there will be no problem of the scanning light staying in the same region of the eye for too long.

[0060] Optionally, the preset position can be a position set in advance by a technician according to actual needs. The preset position can be a position on the eye under examination or a position not on the eye under examination. In this application, the preset position is a position not on the eye under examination to ensure safety.

[0061] In order to clearly describe the technical solutions of the present application and facilitate understanding of the technical solutions of the present application, the following will be combined with Figure 10 The process of scanning the eye under examination based on the target scan line group is explained and described.

[0062] Suppose the target scan line group includes three scan line groups, A scan line group, B scan line group and C scan line group. The A scan line group includes A block scan group and A coding scan group. The B scan line group includes B block scan group and B coding scan group. The C scan line group includes C block scan group and C coding scan group. As can be seen, the eye under examination is divided into three block regions, and the three block regions correspond to the three scan line groups respectively. The block scan group in each scan line group is used to scan the corresponding region.

[0063] When scanning the eye under examination based on the target scan line group, each scan line in the A block scan group in the A scan line group can be used to scan the eye under examination first to obtain the first scan data corresponding to the A block scan group. When the valid information of the first scan data corresponding to the A block scan is determined, the preset position is scanned based on the A coding scan in the A scan line group.

[0064] Further, after the valid information of the first scan data corresponding to the A block scan is determined, each scan line in the B block scan group in the B scan line group can be used to scan the eye under examination to obtain the first scan data corresponding to the B block scan group. When the valid information of the first scan data corresponding to the B block scan is determined, the preset position is scanned based on the B coding scan in the B scan line group. The scanning process of the C scan line group can refer to the above process.

[0065] Step 103, determining the target scan data of each scan line group according to the first scan data of each scan line group and the valid information of the first scan data.

[0066] In some exemplary embodiments, for each scan line group in the target scan line group, the first scan data of each scan line group and the valid information of the first scan data can be determined as the target scan data of each scan line group.

[0067] In other exemplary embodiments, for each scan line group in the target scan line group, the first scan data of each scan line group can also be adjusted according to the valid information of the first scan data of each scan line group, and the first scan data of each scan line group after the adjustment is determined as the target scan data of each scan line group.

[0068] The OCT scanning method described above, first acquires a target scan line group for the eye to be examined, the target scan line group includes a plurality of scan line groups, each of the scan line groups includes a block scan group and an encoding scan group; for any scan line group in the target scan line group, each scan line in the block scan group in the scan line group is used to scan the eye to be examined, and when the valid information of the first scan data corresponding to the block scan group is determined, the preset position is scanned based on the encoding scan group in the scan line group. Since the preset position can be scanned based on the encoding scan group when the valid information of the first scan data corresponding to the block scan group is determined, compared with the prior art, after performing a block scan, the scanning is stopped, and after determining the valid information corresponding to the block scan, the next block scan is performed. It can not only avoid the problem of low scanning safety caused by the long time of the scanning light staying in the same area of the eye to be examined, but also avoid the problem of long scanning time caused by the long stabilization time required for restarting the scanning after stopping the scanning, thereby effectively improving the efficiency of the OCT scanning. Moreover, since the number of device start-ups can be reduced, the probability of mechanical damage to the device can be reduced, and the service life of the device can be prolonged.

[0069] In one example embodiment, as shown in Figure 2 the method further includes the following steps:

[0070] Step 201, acquiring the scanning order information of each scan line group in the target scan line group.

[0071] Optionally, the scanning order information is used to represent the scanning order of the scan line group when scanning the eye to be examined.

[0072] In some example embodiments, as described above, before scanning the eye to be examined based on the target scan line group, the eye to be examined can be divided into a plurality of block regions, each block region corresponds to a block scan group in a scan line group in the target scan line group.

[0073] Assuming that the eye to be examined is divided from top to bottom into three block regions, the uppermost block region is the first block region, the middle block region is the second block region, and the lowermost block region is the third block region. The first block region corresponds to the first block scan group in the first scan group, the second block region corresponds to the second block scan group in the second scan group, and the third block region corresponds to the third block scan group in the third scan group. Since the first block region needs to be scanned first, then the second block region, and then the third block region when scanning the eye to be examined, it can be determined that the scanning order information of the first block scan line group corresponding to the first block region is 1, the scanning order information of the second block scan line group corresponding to the second block region is 2, and the scanning order information of the third block scan line group corresponding to the third block region is 3.

[0074] Step 202, setting the number of scan lines of the encoding scan group in each scan line group according to the scan order information.

[0075] In some exemplary embodiments, it can be understood that the number of scan lines in the encoding scan group in each scan line group is related to the scan order information of each scan line group.

[0076] Specifically, as shown in Figure 11 the number of scan lines in the encoding scan group in each scan line group can be the same as the scan order information of each scan line group. For example, if the scan order information of a certain scan line group is 1, it can be determined that the number of scan lines of the encoding scan group in the scan line group is 1; if the scan order information of a certain scan line group is 2, it can be determined that the number of scan lines of the encoding scan group in the scan line group is 2; if the scan order information of a certain scan line group is N, it can be determined that the number of scan lines of the encoding scan group in the scan line group is N, where N is a positive integer.

[0077] The number of scan lines in the encoding scan group in each scan line group can have a correlation with the scan order information of each scan line group. For example, if the scan order information of a certain scan line group is 1, it can be determined that the number of scan lines of the encoding scan group in the scan line group is X-1; if the scan order information of a certain scan line group is 2, it can be determined that the number of scan lines of the encoding scan group in the scan line group is X-2, if the scan order information of a certain scan line group is N, it can be determined that the number of scan lines of the encoding scan group in the scan line group is X-N, where X is a positive integer and X-N>0.

[0078] In order to clearly describe the technical solutions of the present application and facilitate the understanding of the technical solutions of the present application, the above process is explained and described below.

[0079] Obtaining a target scan line group for the eye under examination, comprising: obtaining a plurality of initial scan line groups for the eye under examination, each initial scan line group comprising a block scan group and an initial encoding scan group;

[0080] Determining the scan order information of each initial scan line group, and performing configuration processing on the initial encoding scan group in each initial scan line group according to the scan order information of each initial scan line group, and determining the initial scan line group comprising the initial encoding scan group after configuration processing as a scan line group, and the plurality of scan line groups constitute the target scan line group.

[0081] The configuration processing can be a process of determining the number of scan lines in the initial encoding scan group according to the scan order information, and setting the scan lines corresponding to the number of scan lines in the initial encoding scan group.

[0082] In one exemplary embodiment, as Figure 3As shown, determining the target scan data of each scan line group according to the first scan data of each scan line group and the valid information of the first scan data comprises the following steps:

[0083] Step 301, determining the second scan data of each scan line group according to the valid information of the first scan data of each scan line group.

[0084] In some exemplary embodiments, the valid information of the first scan data in each scan line group can be subjected to data conversion processing, and the valid information after the data conversion processing is determined as the second scan data of each scan line group.

[0085] The data conversion processing can be used to convert the valid information into data in the same format as the first scan data, or data in a format that can be processed by a processor.

[0086] Step 302, determining the target scan data of each scan line group according to the first scan data and the second scan data of each scan line group. Draw Draw data of each scan line group.

[0087] In some exemplary embodiments, after determining the second scan data of each scan line group according to the valid information of the first scan data of each scan line group, the first scan data and the second scan data of each scan line group can be determined as the target scan data of each scan line group.

[0088] The first scan data and the second scan data of each scan line group can also be subjected to integration processing to obtain the target scan data of each scan line group. Draw Draw data of each scan line group.

[0089] In one exemplary embodiment, after each scan line in the block scan group in the scan line group scans the eye to be examined, the method further comprises determining the scan order information of the scan line group, and when the scan order information is determined, the predetermined position is scanned based on the encoding scan group in the scan line group; determining the target scan data of each scan line group according to the first scan data of each scan line group and the valid information of the first scan data comprises determining the target scan data of each scan line group according to the first scan data of each scan line group, the valid information of the first scan data and the scan order information.

[0090] In some exemplary embodiments, after each scan line in the block scan group in the scan line group scans the eye to be examined, the first scan data of the scan line group can be obtained, the scan order information of the scan line group can be determined at the same time as the valid information of the first scan data is determined, and the predetermined position can be scanned based on the encoding scan group in the scan line group at the same time as the valid information and the scan order information are determined. ​​

[0091] Further, for each of the target scan line groups, the scan order information thereof, the first scan data of the block scan group included therein and the valid information of the first scan data can be determined directly as the target scan data of the scan line group.

[0092] The first scan data can also be adjusted according to the valid information and the scan order information, so that the first scan data carries the valid information and the scan order information, and the adjusted first scan data is determined as the target scan data of the scan line group.

[0093] In an exemplary embodiment, as shown in Figure 4 The determination of the valid information of the first scan data corresponding to the block scan group includes the following steps:

[0094] Step 401, determining the motion amount of the examined eye in the scanning process of the block scan group.

[0095] In some exemplary embodiments, the motion amount of the examined eye in the scanning process of the block scan group can be determined based on an ophthalmoscope. The ophthalmoscope can be a confocal scanning system ophthalmoscope (CSSO), a confocal scanning laser ophthalmoscopy (CSLO), a scanning laser ophthalmoscopy (SLO) or a line scan ophthalmoscope (LSO).

[0096] In other exemplary embodiments, the motion amount of the examined eye in the scanning process of the block scan group can also be determined based on a pupil camera.

[0097] In other exemplary embodiments, the motion amount of the examined eye in the scanning process of the block scan group can also be determined according to the first scan data corresponding to the block scan group.

[0098] Step 402, in the case where the motion amount is greater than a preset motion amount threshold, determining that the valid information is invalid.

[0099] Optionally, the preset motion amount threshold can be set by a technician according to actual needs.

[0100] In some exemplary embodiments, after determining the motion amount of the examined eye in the scanning process of the block scan group, it can be determined whether the motion amount is greater than a preset motion amount threshold.

[0101] If the amount of movement exceeds the preset movement threshold, it can be determined that the amount of movement of the examined eye during the scanning process of this scan group may have had a significant impact on the first scan data, resulting in poor quality of the first scan data. Therefore, the valid information of the first scan data can be determined to be invalid.

[0102] Step 403: If the amount of exercise is less than or equal to the preset exercise threshold, the valid information is determined to be valid.

[0103] In some exemplary embodiments, if the amount of movement is less than or equal to a preset movement threshold, it can be determined that the amount of movement of the examined eye during the scanning process of the scan group may have a small impact on the first scan data and the quality of the first scan data is high. Therefore, the effective information of the first scan data can be determined to be valid.

[0104] In one exemplary embodiment, such as Figure 5 As shown, determining the second scan data for each scan line group based on the valid information of the first scan data for each scan line group includes the following steps:

[0105] Step 501: Obtain the valid information of the first scan data of each scan line group and the initial scan data corresponding to the coded scan group in each scan line group;

[0106] Step 502: Integrate the valid information and the initial scan data to obtain the second scan data for each scan group.

[0107] Optionally, this integration process can be used to make the initial scan data carry the valid information.

[0108] In some exemplary embodiments, valid information on the first scan number of the block scan group in each scan line group can be obtained, and the initial scan data of the coded scan group in each scan line group can be obtained.

[0109] Furthermore, after obtaining the valid information of the first scan data of the block scan group and the initial scan data of the coded scan group in each scan line group, the valid information and the initial scan data can be integrated to obtain the second scan data of each scan group.

[0110] In an optional embodiment of this application, the valid information and the initial scan... Draw The data is integrated and processed to obtain the second scan data for each scan group, including:

[0111] If valid information indicates that the first scan data is valid, a first adjustment process is performed on the initial scan data to obtain the second scan data. This first adjustment process is used to adjust the initial scan data. Draw The data carries a first identifier to indicate that the first scan data is valid.

[0112] In the case that the valid information indicates that the first scan data is invalid, a second adjustment process is performed on the initial scan data to obtain second scan data, the second adjustment process being used to make the initial scan data valid. Draw The data carries a second identification used to represent that the first scan data is invalid.

[0113] In an exemplary embodiment, the determination of the target scan data of each scan line group according to the first scan data of each scan line group, the valid information of the first scan data and the scan sequence information comprises: obtaining initial scan data of an encoding scan group in each scan line group, and performing integration processing on the valid information of the first scan data of each scan line group, the scan sequence information and the initial scan data to obtain second scan data of each scan group; and determining the target scan data of each scan line group according to the second scan data of each scan group and the first scan data of each scan group.

[0114] The detailed implementation process of the above method can refer to the related content of the integration processing of the valid information and the initial scan data described above, which will not be described herein again. Draw

[0115] In an exemplary embodiment, as shown in Figure 6 the method further comprises the following steps:

[0116] Step 601: If the valid information indicates that the first scan data is invalid, the step of performing scanning on the examined eye based on each scan line in the block scan group in the scan line group is performed again until the valid information indicates that the first scan data corresponding to the block scan group is valid.

[0117] Step 602: After the valid information indicates that the first scan data is valid, the step of performing scanning on the examined eye based on each scan line in the block scan group in the next scan line group is performed.

[0118] In some exemplary embodiments, after the valid information of the first scan data of the block scan group of the scan line group is determined, if the valid information indicates that the first scan data is invalid, scanning on the examined eye based on each scan line in the block scan group in the scan line group is performed again until the valid information indicates that the first scan data corresponding to the block scan group is valid.

[0119] ​Specifically, as described above, it is assumed that the target scan line groups include three scan line groups, i.e., an A scan line group, a B scan line group, and a C scan line group, the A scan line group includes an A block scan group and an A coding scan group, the B scan line group includes a B block scan group and a B coding scan group, and the C scan line group includes a C block scan group and a C coding scan group. After scanning the eye under examination based on the A block scan group, first scan data corresponding to the A block scan group can be obtained, and the preset position can be scanned based on the A coding scan group when determining valid information of the first scan data corresponding to the A block scan group.

[0120] Further, after determining the valid information of the first scan data corresponding to the A block scan group, if the valid information of the first scan data corresponding to the A block scan group indicates that the first scan data is invalid, the step of scanning the eye under examination based on each scan line in the A block scan group can be performed again until the valid information of the first scan data determined after scanning the eye under examination based on each scan line in the A block scan group indicates that the first scan data is valid, and then the step of scanning the eye under examination based on each scan line in the B block scan group is performed.

[0121] It should be noted that if the valid information of the first scan data corresponding to the A block scan group obtained after performing the step of scanning the eye under examination based on each scan line in the A block scan group for a plurality of times indicates that the first scan data is invalid, the scanning is stopped, and a warning information is output. The above-mentioned process of performing the step of scanning the eye under examination based on each scan line in the A block scan group for a plurality of times can be understood as a process of rescan, and specifically, the number of times of rescan can be limited according to actual needs.

[0122] In an exemplary embodiment, the method further comprises determining a three-dimensional image of the eye under examination according to the target scan data of each of the scan line groups.

[0123] In some exemplary embodiments, the target scan data of each scan group can be input into a pre-trained stitching model to obtain a three-dimensional image of the eye under examination output by the stitching model.

[0124] In an exemplary embodiment, the determination of the three-dimensional image of the eye under examination according to the target scan data of each of the scan line groups comprises: performing stitching processing on the first scan data in the target scan data of each of the scan line groups according to the second scan data in the target scan data of each of the scan line groups to obtain the three-dimensional image.

[0125] In some exemplary embodiments, the valid information and the scan order information can be determined according to the second scan data in the target scan data of each scan line group, and then the valid information, the scan order information, and the first scan data in the target scan data of each scan line group can be input into a pre-trained stitching model to obtain a three-dimensional image output by the stitching model.

[0126] In one example embodiment, as shown in FIG. 8, the root determines the first scan data of the target scan data of each scan line group according to the second scan data of the target scan data of each scan line group, and performs stitching processing on the first scan data of the target scan data of each scan line group to obtain the three-dimensional image, including the following steps: Figure 7

[0127] Step 701, according to the second scan data of the target scan data of each scan line group, determining the valid information of the first scan data of the target scan data of each scan line group, and performing filtering processing on the first scan data of the target scan data of each scan line group according to the valid information to obtain the first scan data after filtering processing.

[0128] In some example embodiments, the second scan data of the target scan data of each scan line group carries the valid information of the first scan data, and the first scan data of the target scan data of each scan line group can be filtered processed according to the valid information of the first scan data to obtain the first scan data after filtering processing.

[0129] Specifically, it is determined whether the second scan data of the target scan data of each scan line group carries the second identifier, if it carries, the first scan data of the target scan data is discarded, if it does not carry, the first scan data of the target scan data is retained.

[0130] Further, after the above operation is performed on the target scan data of each scan line group, the retained first scan data can be determined as the first scan data after filtering processing.

[0131] Step 702, according to the second scan data of the target scan data of each scan line group, determining the scan order information of each scan line group, and determining the sorting information of the first scan data of the target scan data of each scan line group according to the scan order information of each scan line group.

[0132] In some example embodiments, in the case that the number of scan lines of the coded scan is related to the scan order information, the number of scan lines of the coded scan group in each scan line group is determined according to the second scan data of the target scan data of each scan line group, and then the scan order information of each scan line group is determined according to the number of scan lines.

[0133] In other example embodiments, in the case that the second scan data carries the scan order information, the scan order information of each scan line group is directly determined according to the second scan data of the target scan data of each scan line group.

[0134] ​Further, after determining the scanning order information of each scan line group, the order information of each scan line group can be determined as the order information of the first scan data in the target scan data of each scan line group.

[0135] In step 703, the first scan data after filtering is spliced according to the order information to obtain the three-dimensional image.

[0136] In some exemplary embodiments, the first scan data after filtering can be spliced according to the order information to obtain the three-dimensional image of the eye under examination.

[0137] The method for determining the three-dimensional image of the eye under examination according to the target scan data has higher splicing accuracy because the second scan data in the target scan data carries the effective information and the scanning order information of the first scan data, and thus the obtained three-dimensional image has higher accuracy.

[0138] In an optional embodiment of the present application, the method further comprises: after scanning the preset position based on the coded scan group in the scan line group, if the effective information of the first scan corresponding to the block scan group has not been determined, repeating the step of scanning the preset position based on the coded scan group in the scan line group until the effective information of the first scan corresponding to the block scan group is determined.

[0139] If the number of times of repeating the step of scanning the preset position based on the coded scan group in the scan line group is greater than a preset repetition number, the scanning is stopped and a warning information is output.

[0140] Alternatively, if the time of repeating the step of scanning the preset position based on the coded scan group in the scan line group is greater than a preset repetition time, the scanning is stopped and a warning information is output.

[0141] In an exemplary embodiment, another OCT scanning method is provided, in which the number of scan lines in the coded scan group is related to the scanning order information. The method comprises the following steps:

[0142] A1, obtaining scanning order information of each scan line group; setting the number of scan lines in the coded scan group in each scan line group according to the scanning order information to obtain a target scan line group, the target scan line group comprising a plurality of scan line groups, each scan line group comprising a block scan group and a coded scan group;

[0143] A2. For any scan line group in the target scan line group, the eye under examination is scanned based on each scan line in the block scan group in the scan line group to obtain the first scan data corresponding to the block scan group. When determining the effective information of the first scan data based on the amount of movement of the eye under examination during the scanning of the block scan group, the preset position is scanned based on the coded scan group in the scan line group.

[0144] A3. Obtain valid information of the first scan data for each scan line group and initial scan data corresponding to the coded scan group in each scan line group; integrate the valid information and the initial scan data to obtain the second scan data for each scan group; based on the first scan data of each scan line group... Draw Data and second scan Draw The data determines the target scan data for each scan line group;

[0145] A4. Based on the second scan data in the target scan data of each scan line group, determine the valid information of the first scan data in the target scan data of each scan line group, and filter the first scan data in the target scan data of each scan line group based on the valid information to obtain the filtered first scan data.

[0146] A5. Based on the second scan data in the target scan data of each scan line group, determine the scan order information of each scan line group, and based on the scan order information of each scan line group, determine the sorting information of the first scan data in the target scan data of each scan line group; based on the sorting information, stitch the filtered first scan data together to obtain the three-dimensional image.

[0147] In one exemplary embodiment, another OCT scanning method is provided, in which the second scan data includes scanning sequence information of scan line groups, and the method includes the following steps:

[0148] B1. Obtain the target scan line group for the eye being examined. The target scan line group includes multiple scan line groups, and each scan line group includes a block scan group and a coded scan group.

[0149] B2. For any scan line group in the target scan line group, the eye under examination is scanned based on each scan line in the block scan group in the scan line group to obtain the first scan data corresponding to the block scan group. When determining the effective information of the first scan data and the order information of the scan line group based on the amount of movement of the eye under examination during the scanning of the block scan group, the preset position is scanned based on the coded scan group in the scan line group.

[0150] B3, obtaining valid information of first scanning data of each of the scanning line groups, scanning sequence information of each of the scanning line groups and initial scanning data of an encoded scanning group in each of the scanning line groups; performing integration processing on the valid information, the scanning sequence information and the initial scanning data to obtain second scanning data of each of the scanning groups; determining target scanning data of each of the scanning line groups according to the first scanning data and the second scanning data of each of the scanning line groups. Draw data and second scanning Draw data of each of the scanning line groups.

[0151] B4, determining valid information of first scanning data in the target scanning data of each of the scanning line groups according to second scanning data in the target scanning data of each of the scanning line groups, and performing filtering processing on the first scanning data in the target scanning data of each of the scanning line groups according to the valid information to obtain filtered first scanning data.

[0152] B5, determining scanning sequence information of each of the scanning line groups according to second scanning data in the target scanning data of each of the scanning line groups, and determining sorting information of first scanning data in the target scanning data of each of the scanning line groups according to the scanning sequence information of each of the scanning line groups; performing splicing processing on the filtered first scanning data according to the sorting information to obtain the three-dimensional image.

[0153] It should be understood that, although each step in the flowchart involved in each of the above-described embodiments is shown in sequence according to the arrow, these steps are not necessarily executed in sequence according to the arrow. Unless otherwise specified herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other sequences. Moreover, at least part of the steps in the flowchart involved in each of the above-described embodiments can include multiple steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution sequence of these steps or stages is not necessarily sequential, but can be executed in rotation or alternation with at least part of other steps or steps or stages in other steps.

[0154] Based on the same inventive concept, the embodiments of the present application also provide an OCT scanning device for implementing the above-mentioned OCT scanning method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above-mentioned method, so the specific limitations in one or more OCT scanning device embodiments provided below can refer to the limitations of the OCT scanning method in the above text, which will not be repeated here.

[0155] In an exemplary embodiment, as shown in Figure 8 An OCT scanning device 800 is provided, comprising an obtaining module 801, an execution module 802 and a determination module 803, wherein:

[0156] The acquisition module 801 is configured to acquire a target scan line group for an eye to be examined, the target scan line group comprising a plurality of scan line groups, each of the scan line groups comprising a block scan group and an encoding scan group.

[0157] The execution module 802 is configured to, for any scan line group in the target scan line group, scan the eye to be examined based on each scan line in the block scan group in the scan line group, and when determining valid information of first scan data corresponding to the block scan group, scan a preset position based on the encoding scan group in the scan line group.

[0158] The determination module 803 is configured to determine target scan data of each of the scan line groups according to the first scan data of each of the scan line groups and the valid information of the first scan data.

[0159] In an embodiment, the acquisition module 801 is further configured to scan order information of each of the scan line groups in the target scan line group; and set a number of scan lines of the encoding scan group in each of the scan line groups according to the scan order information.

[0160] In an embodiment, the determination module 803 is specifically configured to determine second scan data of each of the scan line groups according to the valid information of the first scan data of each of the scan line groups; and determine the target scan data of each of the scan line groups according to the first scan data and the second scan data of each of the scan line groups. Draw Draw In an embodiment, the determination module 803 is specifically configured to determine second scan data of each of the scan line groups according to the valid information of the first scan data of each of the scan line groups; and determine the target scan data of each of the scan line groups according to the first scan data and the second scan data of each of the scan line groups.

[0161] In an embodiment, the execution module 802 is further configured to determine scan order information of the scan line group, and when the scan order information is determined, scan the preset position based on the encoding scan group in the scan line group.

[0162] In an embodiment, the determination module 803 is specifically configured to determine target scan data of each of the scan line groups according to the first scan data of each of the scan line groups, the valid information of the first scan data, and the scan order information.

[0163] In an embodiment, the determination module 803 is specifically configured to acquire initial scan data of the encoding scan group in each of the scan line groups, and integrate the valid information of the first scan data of each of the scan line groups, the scan order information, and the initial scan data to obtain second scan data of each of the scan line groups; and determine the target scan data of each of the scan line groups according to the second scan data of each of the scan line groups and the first scan data of each of the scan line groups.

[0164] ​In an embodiment, the execution module 802 is specifically configured to determine the motion amount of the eye under test in the scanning process of the block scanning group; determine that the valid information is invalid when the motion amount is greater than a preset motion amount threshold; and determine that the valid information is valid when the motion amount is less than the preset motion amount threshold.

[0165] In an embodiment, the determination module 803 is specifically configured to obtain the valid information of the first scanning data of each scanning line group and the initial scanning data of the encoded scanning group in each scanning line group; and perform integration processing on the valid information and the initial scanning data to obtain the second scanning data of each scanning group.

[0166] In an embodiment, the execution module 802 is further configured to, if the valid information indicates that the first scanning data is invalid, perform again the step of scanning the eye under test based on each scanning line in the block scanning group in the scanning line group until the valid information indicates that the first scanning data corresponding to the block scanning group is valid; and perform the step of scanning the eye under test based on each scanning line in the block scanning group in the next scanning line group after the valid information indicates that the first scanning data is valid.

[0167] In an embodiment, the determination module 803 is further configured to determine the three-dimensional image of the eye under test according to the target scanning data of each scanning line group.

[0168] In an embodiment, the determination module 803 is specifically configured to perform splicing processing on the first scanning data in the target scanning data of each scanning line group according to the second scanning data in the target scanning data of each scanning line group to obtain the three-dimensional image.

[0169] In an embodiment, the determination module 803 is specifically configured to determine the valid information of the first scanning data in the target scanning data of each scanning line group according to the second scanning data in the target scanning data of each scanning line group, perform filtering processing on the first scanning data in the target scanning data of each scanning line group according to the valid information to obtain the first scanning data after filtering processing, determine the scanning order information of each scanning line group according to the second scanning data in the target scanning data of each scanning line group, and determine the sorting information of the first scanning data in the target scanning data of each scanning line group according to the scanning order information of each scanning line group; perform splicing processing on the first scanning data after filtering processing according to the sorting information to obtain the three-dimensional image.

[0170] The modules in the OCT scanning device described above can be implemented in whole or in part by software, hardware, and combinations thereof. The modules described above can be embedded in or independent of a processor in a computer device in hardware form, or stored in a memory in a computer device in software form, so as to be called and executed by a processor to perform the operations corresponding to the above modules.

[0171] In an exemplary embodiment, a computer device, which can be a terminal, is provided, and an internal structure diagram of the computer device can be as shown in Figure 9 The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit, and an input device. The processor, the memory, and the input / output interface are connected through a system bus, and the communication interface, the display unit, and the input device are connected to the system bus through the input / output interface. The processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for running the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is configured to exchange information between the processor and external devices. The communication interface of the computer device is configured to perform wired or wireless communication with external terminals, and the wireless communication can be achieved through WIFI, mobile cellular network, near field communication (NFC), or other technologies. The computer program is executed by the processor to implement an OCT scanning method. The display unit of the computer device is configured to form a visually visible picture, which can be a display screen, a projection device, or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer overlaid on the display screen, or a key, a trackball, or a touchpad arranged on the shell of the computer device, or an external keyboard, a touchpad, a mouse, or the like.

[0172] Those skilled in the art can understand that Figure 9 The structure shown in the above description is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the computer device to which the scheme of the present application is applied. Specifically, the computer device can include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0173] In an exemplary embodiment, a computer device is provided, which includes a memory and a processor, and the memory stores a computer program. When the processor executes the computer program, the steps of the method described in any of the above embodiments are implemented.

[0174] In an embodiment, a computer readable storage medium is provided, having stored thereon a computer program which, when executed by a processor, implements the steps of the method according to any of the embodiments described above.

[0175] In an embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the steps of the method according to any of the embodiments described above.

[0176] It should be noted that the user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the present application are all information and data authorized by the user or authorized by all parties, and the collection, use and processing of related data need to comply with relevant regulations.

[0177] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when executed, can include the processes of the above-mentioned embodiment methods. Any reference to memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. The non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. The volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration but not limitation, the RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided in the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., without being limited thereto.

[0178] The technical features of the above embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present application.

[0179] The above-described embodiments are merely illustrative of several embodiments of the present application, which are described in more detail and in a specific manner, but should not be construed as limiting the scope of the patent of the present application. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. An OCT scanning method, characterized by, The method comprises: acquiring a target scan line group for an eye to be examined, the target scan line group comprising a plurality of scan line groups, each of the scan line groups comprising a block scan group and an encoding scan group; for any scan line group in the target scan line group, scanning the eye to be examined based on each scan line in the block scan group in the scan line group, and scanning a preset position based on the encoding scan group in the scan line group when determining valid information of first scan data corresponding to the block scan group; determining second scan data of each of the scan line groups according to the valid information of the first scan data of each of the scan line groups, and determining target scan data of each of the scan line groups according to the first scan data and the second scan data of each of the scan line groups; The method further comprises: according to the second scan data in the target scan data of each of the scan line groups, splicing the first scan data in the target scan data of each of the scan line groups to obtain a three-dimensional image.

2. The method of claim 1, wherein, The method further comprises: acquiring scan order information of each of the scan line groups in the target scan line group; setting the number of scan lines of the encoding scan group in each of the scan line groups according to the scan order information.

3. The method of claim 1, wherein, After scanning the eye to be examined based on each scan line in the block scan group in the scan line group, the method further comprises: determining scan order information of the scan line group, and scanning the preset position based on the encoding scan group in the scan line group when determining the scan order information; The determination of the target scan data of each of the scan line groups according to the first scan data and the valid information of the first scan data of each of the scan line groups comprises: determining the target scan data of each of the scan line groups according to the first scan data, the valid information of the first scan data and the scan order information of each of the scan line groups.

4. The method of claim 3, wherein, The determination of the target scan data of each of the scan line groups according to the first scan data, the valid information of the first scan data and the scan order information of each of the scan line groups comprises: acquiring initial scan data of the encoding scan group in each of the scan line groups, and integrating the valid information of the first scan data, the scan order information and the initial scan data of each of the scan line groups to obtain second scan data of each of the scan groups; determining the target scan data of each of the scan line groups according to the second scan data of each of the scan groups and the first scan data of each of the scan groups.

5. The method of claim 1, wherein, The determination of the valid information of the first scan data corresponding to the block scan group comprises: determining the amount of motion of the eye to be examined in the scanning process of the block scan group; in the case that the amount of motion is greater than a preset motion threshold, determining that the valid information is invalid; in the case that the amount of motion is less than the preset motion threshold, determining that the valid information is valid.

6. The method of claim 1, wherein, The determination of the second scan data of each of the scan line groups according to the valid information of the first scan data of each of the scan line groups comprises: acquiring the valid information of the first scan data of each of the scan line groups and initial scan data of the encoding scan group in each of the scan line groups; The effective information and the initial scanning data are integrated to obtain second scanning data of each scanning group.

7. The method of claim 6, wherein, The integration of the effective information and the initial scanning data to obtain second scanning data of each scanning group comprises: In the case that the effective information indicates that the first scanning data is valid, the initial scanning data is subjected to first adjustment processing to obtain second scanning data; the first adjustment processing is used to make the initial scanning data carry a first identifier for representing that the first scanning data is valid; In the case that the effective information indicates that the first scanning data is invalid, the initial scanning data is subjected to second adjustment processing to obtain second scanning data; the second adjustment processing is used to make the initial scanning data carry a second identifier for representing that the first scanning data is invalid.

8. The method of claim 1, wherein, The method further comprises: If the effective information indicates that the first scanning data is invalid, the step of scanning the eye under examination based on each scanning line in the block scanning group in the scanning line group is performed again until the effective information indicates that the first scanning data corresponding to the block scanning group is valid; After the effective information indicates that the first scanning data is valid, the step of scanning the eye under examination based on each scanning line in the block scanning group in the next scanning line group is performed.

9. The method of claim 1, wherein, The splicing of the first scanning data in the target scanning data of each scanning line group based on the second scanning data in the target scanning data of each scanning line group to obtain the three-dimensional image comprises: According to the second scanning data in the target scanning data of each scanning line group, effective information of the first scanning data in the target scanning data of each scanning line group is determined, and the first scanning data in the target scanning data of each scanning line group is subjected to filtering processing according to the effective information to obtain filtered first scanning data; According to the second scanning data in the target scanning data of each scanning line group, scanning sequence information of each scanning line group is determined, and sorting information of the first scanning data in the target scanning data of each scanning line group is determined according to the scanning sequence information of each scanning line group; The filtered first scanning data is subjected to splicing processing according to the sorting information to obtain the three-dimensional image.

10. The method of claim 3, wherein, The method further comprises: after the preset position is scanned based on the encoding scanning group in the scanning line group, if the effective information of the first scanning data is not determined, the step of scanning the preset position based on the encoding scanning group in the scanning line group is repeatedly performed until the effective information of the first scanning data is determined.

Images