Control method of projection equipment and projection equipment

Abstract

The invention provides a control method of projection equipment and the projection equipment, and the method comprises the steps: obtaining a current first projection distance of the projection equipment; determining target brightness corresponding to the first projection distance from an association relationship; controlling an optical machine of the projection equipment to be adjusted to the target brightness; and under the condition that the light machine brightness is at the target brightness, executing automatic correction of the projection picture on the projection equipment. According to the method and the device, the power frequency interference fringes of the projection picture can be reduced by adjusting the brightness of the light machine, so that the projection picture reaches relatively high definition, and then the step of automatically correcting the projection picture is carried out, so that the experience degree of watching the projection picture after automatic correction by a user is better.

Description

Technical Field

[0001] The present application relates to the field of projection technology, and in particular to a control method for a projection device and a projection device. Background Art

[0002] When using a projector for projection, it is usually necessary to correct the projected image. Specifically, the camera module in the projector can shoot the projected image projected by the optical machine onto the screen, and the projected image can be processed by an image algorithm to focus, calibrate, and enter the projected image. However, when using the camera module to shoot the optical machine projection area, affected by factors such as the optical machine's own frequency and the ambient light frequency, power frequency interference stripes will appear on the image captured by the camera module. Such power frequency interference stripes will cause the captured image to have poor clarity, thereby affecting the accuracy of the subsequent correction of the projector. Summary of the invention

[0003] The present application at least provides a control method for a projection device and a projection device.

[0004] In a first aspect, the present application provides a method for controlling a projection device, comprising:

[0005] Get the current first projection distance of the projection device;

[0006] Determining a target brightness corresponding to the first projection distance from the association relationship;

[0007] Controlling the optical machine of the projection device to adjust to the target brightness;

[0008] When the optical machine brightness is at the target brightness, a step of automatically correcting the projection image is performed on the projection device.

[0009] In an optional implementation manner, the projection device pre-stores the association relationship during a testing phase before the device leaves the factory;

[0010] The association relationship includes a plurality of corresponding relationships between different projection distances and light machine brightness;

[0011] The optical-mechanical brightness in the association relationship satisfies a preset condition when the projection screen is projected when the projection device is at a corresponding projection distance.

[0012] In an optional implementation manner, the method further includes:

[0013] When a projection distance corresponding to the first projection distance is not matched from the association relationship, the optical machine brightness corresponding to the projection distance with the smallest difference from the first projection distance in the association relationship is used as the target brightness.

[0014] In an optional implementation manner, the method further includes:

[0015] When it is detected that the first projection distance changes, the step of determining the target brightness corresponding to the changed first projection distance from the association relationship is re-executed.

[0016] In an optional implementation manner, the method further includes:

[0017] When it is detected that the target brightness fails or the automatic correction fails, obtaining a projection picture corresponding to the projection device at a first projection distance;

[0018] By adjusting the optical and mechanical brightness of the projection device to a target brightness, the projection image meets the preset conditions;

[0019] When the optical machine brightness is at the target brightness, a step of automatically correcting the projection image is performed on the projection device.

[0020] In an optional implementation manner, the method further includes:

[0021] Under the current projection picture, obtaining the initial brightness corresponding to the optical machine in the projection device;

[0022] When the optical machine is at the initial brightness, extracting image features of the projection picture;

[0023] A target image feature is obtained, where the target image feature is extracted from a target projection screen, where the target projection screen is a projection screen projected by the projection device during a test phase before the device leaves the factory, and is an image stored when a preset condition is met.

[0024] In an optional implementation manner, the method further includes:

[0025] Determining the similarity between the image feature and the target image feature;

[0026] When the similarity is less than or equal to a preset value, the initial brightness is adjusted to re-execute the step of extracting the image features of the projection picture until the similarity is greater than the preset value to obtain the target brightness.

[0027] In an optional implementation manner, the step of automatically correcting the projection image includes at least one of the following:

[0028] Focus, ladder calibration, scene entry or obstacle avoidance.

[0029] In an optional implementation manner, the method further includes:

[0030] After the projection device completes the step of automatically correcting the projection image, the optical machine is controlled to switch from the target brightness to the initial brightness, wherein the target brightness is less than the initial brightness.

[0031] In a second aspect, the present application provides a projection device, comprising:

[0032] An acquisition module, used to acquire a current first projection distance of the projection device;

[0033] A determination module, configured to determine a target brightness corresponding to the first projection distance from the association relationship;

[0034] A control module controls the optical machine of the projection device to adjust to the target brightness;

[0035] The correction module performs the step of automatically correcting the projection image on the projection device when the optical machine brightness is at the target brightness.

[0036] In a third aspect, the present application provides a projection device, comprising: a processor and a memory, wherein the processor is used to execute a control program of the projection device stored in the memory to implement the control method of the projection device described in any one of the first aspects above.

[0037] In the present application, the current first projection distance of the projection device can be obtained first, and the target brightness corresponding to the first projection distance can be determined from the association relationship to control the optical machine of the projection device to adjust to the target brightness. When the optical machine brightness is at the target brightness, the step of automatically correcting the projection screen can be performed on the projection device. Based on this, the present application can reduce the power frequency interference stripes of the projection screen by adjusting the brightness of the optical machine so that the projection screen achieves a higher clarity, and then perform the step of automatically correcting the projection screen so that the user has a better experience of viewing the automatically corrected projection screen.

[0038] In order to make the above-mentioned objectives, features and advantages of the present disclosure more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. The drawings herein are incorporated into the specification and constitute a part of the specification. These drawings illustrate embodiments consistent with the present disclosure and are used together with the specification to illustrate the technical solution of the present disclosure. It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can also be obtained based on these drawings without creative work.

[0040] Figure 1 A flow chart showing a method for controlling a projection device provided by the present application is shown;

[0041] Figure 2 A flow chart showing another method for controlling a projection device provided by the present application is shown;

[0042] Figure 3 A flow chart showing a method for determining target brightness provided by the present application is shown;

[0043] Figure 4 A flow chart showing another method for controlling a projection device provided by the present application is shown;

[0044] Figure 5 A flow chart showing another method for controlling a projection device provided by the present application is shown;

[0045] Figure 6 A schematic diagram of a projection device provided by the present application is shown;

[0046] Figure 7 A schematic diagram of another projection device provided by the present application is shown. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below in conjunction with the drawings in the present application. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. The components of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present disclosure provided in the drawings is not intended to limit the scope of the present disclosure claimed for protection, but merely represents the selected embodiments of the present disclosure. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present disclosure.

[0048] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0049] The term "and / or" herein only describes an association relationship, indicating that three relationships may exist. For example, A and / or B may represent the following three situations: A exists alone, A and B exist at the same time, and B exists alone. In addition, the term "at least one" herein represents any combination of at least two of any one or more of a plurality of. For example, including at least one of A, B, and C may represent including any one or more elements selected from the set consisting of A, B, and C.

[0050] To facilitate understanding of this embodiment, a control method for a projection device disclosed in this application is first introduced in detail. The execution subject of the control method for a projection device provided in this application is generally a projection device. In some possible implementations, the control method for the projection device can be implemented by a processor calling a computer-readable instruction stored in a memory.

[0051] See also Figure 1 As shown, it is a flow chart of a control method of a projection device provided by the present application, the method comprises steps S101 to S107, wherein:

[0052] S101: Acquire a current first projection distance of a projection device.

[0053] In the present application, the first projection distance may be the distance between the projection device and the projection screen projected by the projection device. Here, the projection device may be, but is not limited to, a projector, on which a time of flight (TOF) sensor is disposed, and the TOF sensor may emit a ranging signal such as a measuring light, and calculate the first projection distance between the projection device and the projection screen by counting the time required from emitting the ranging signal to receiving the ranging signal.

[0054] S103: Determine a target brightness corresponding to the first projection distance from the association relationship.

[0055] S105: Control the optical machine of the projection device to adjust to the target brightness.

[0056] In the present application, an optical machine is also provided on the projection device, and the optical machine is used to provide a light source for the projection device, and the brightness of the light source is adjustable. It should be understood that the number of power frequency interference stripes in the projection picture captured by the projection device is related to the projection distance and the brightness of the optical machine. Therefore, an association relationship can be pre-set to find the target brightness corresponding to the first projection distance based on the association relationship. It should be understood that after the optical machine is adjusted to the target brightness, the projection picture captured by the projection device meets the correction condition, that is, the number of power frequency interference stripes in the projection picture is small, or there are no power frequency interference stripes. At this time, the projection picture can be corrected.

[0057] Here, the above association relationship can be determined by the projection device in the test phase before the device leaves the factory. After the association relationship is determined, the association relationship can be stored in a query file so that the projection device can search for the corresponding target brightness based on the query file during use.

[0058] S107: When the optical machine brightness is at the target brightness, perform a step of automatically correcting the projection image on the projection device.

[0059] In the present application, the automated correction step can be used to instruct adjustment of the projection parameters of the projection device to improve the viewability of the projection picture and enhance the viewing experience of the user. Specifically, the automated correction includes one or more correction steps. When multiple correction steps are included, a correction order can be pre-set, and based on the correction order, the automated correction steps of the projection picture are performed on the projection device in sequence. Here, the specific correction steps included in the automated correction are described as follows and will not be expanded here.

[0060] In a specific implementation, before executing each correction step based on the above correction order, it can be determined whether the current projection picture meets the execution conditions for executing the correction step. If so, the correction step is executed. If not, it is determined whether the projection picture has achieved the correction target of the correction step. If so, the next correction step is executed. If not, the target brightness is redetermined to re-execute the steps of automatic correction of the projection picture on the projection device.

[0061] It can be known from the above description that in the present application, the current first projection distance of the projection device can be first obtained, and the target brightness corresponding to the first projection distance can be determined from the association relationship to control the optical machine of the projection device to adjust to the target brightness. When the optical machine brightness is at the target brightness, the step of automatic correction of the projection screen can be performed on the projection device. Based on this, the present application can reduce the power frequency interference stripes of the projection screen by adjusting the brightness of the optical machine so that the projection screen achieves a higher clarity, and then perform the automatic correction step of the projection screen to provide users with a better experience of viewing the automatically corrected projection screen.

[0062] In an optional implementation, the above-mentioned projection device stores the association relationship in advance during the testing phase before the device leaves the factory; wherein,

[0063] The association relationship includes a plurality of corresponding relationships between different projection distances and light machine brightness;

[0064] The optical-mechanical brightness in the association relationship satisfies a preset condition when the projection screen is projected when the projection device is at a corresponding projection distance.

[0065] In this application, the above preset conditions can be used to indicate that the clarity of the projected image meets the calibration requirements, for example, there are fewer or no power frequency interference stripes in the projected image. Based on this, multiple sets of correspondences between different projection distances and optical machine brightness can be pre-set during the test phase before the device leaves the factory.

[0066] In the specific implementation, it is considered that when the projection distance is close, a large power frequency interference will be generated on the projection screen. Therefore, multiple projection distances can be set within a relatively close projection distance range, and the corresponding light machine brightness can be determined for each projection distance. For example, the projection distance range can be 1m, and the projection distance can be set to: 0.2m, 0.3m, 0.4m, ... 1m.

[0067] It should be understood that the higher the brightness of the projected image, the shorter the exposure time when the projection device uses automatic exposure to shoot, which leads to an increase in the brightness of the power frequency interference fringes. At the same time, when the automatic exposure time is too short, it cannot adapt to the high-brightness projection environment, resulting in the captured projection image being too dark, making the contrast of the power frequency interference fringes heavier, and further aggravating the display effect of the power frequency interference fringes.

[0068] Based on this, when determining the optical machine brightness corresponding to the projection distance, the brightness of the projection image can be reduced by gradually lowering the optical machine brightness to gradually reduce the number and brightness of the power frequency interference stripes until the optical machine brightness corresponding to the projection distance is obtained.

[0069] In the present application, the association relationship can be determined in advance during the testing phase before the device leaves the factory, and the association relationship can be stored in a query file, so that after the projection device leaves the factory, the optical brightness that matches the projection distance can be directly queried based on the query file, thereby improving the efficiency of determining the optical brightness.

[0070] In an optional embodiment, the above Figure 1 The corresponding embodiment also includes the following process:

[0071] When a projection distance corresponding to the first projection distance is not matched from the association relationship, the optical machine brightness corresponding to the projection distance with the smallest difference from the first projection distance in the association relationship is used as the target brightness.

[0072] In the present application, considering that during the actual use of the projection device, the first projection distance is usually different from the projection distance in the above-mentioned association relationship, at this time, the target brightness cannot be directly determined based on the association relationship. Therefore, the target brightness corresponding to the first projection distance can be determined in the following ways.

[0073] Method 1: The optical machine brightness corresponding to the projection distance that is the smallest difference from the first projection distance in the association relationship is used as the target brightness.

[0074] In the present application, the difference between each projection distance in the above association relationship and the first projection distance can be calculated to determine the projection distance with the smallest difference from the first projection distance, and the optical brightness corresponding to the projection distance is used as the target brightness.

[0075] For example, the first projection distance is 2.6 m, and the optical-mechanical brightness corresponding to 2 m and 3 m exists in the association relationship. Therefore, the optical-mechanical brightness corresponding to 3 m is taken as the target brightness.

[0076] Method 2: construct an objective function based on the association relationship, and calculate the target brightness corresponding to the first projection distance through the objective function.

[0077] In the present application, an objective function may be generated based on the association relationship, wherein the objective function may be a linear function for indicating the corresponding relationship between the projection distance and the optical machine brightness.

[0078] Next, the target brightness matching the first projection distance may be calculated based on the determined objective function. Specifically, the first projection distance may be input into the objective function as the value of an independent variable, and the output result may be determined as the target brightness.

[0079] For example, when the objective function is a linear function of the form y=ax+b, if the first projection distance is d, x in the objective function can be set to d to obtain the target brightness y. It should be understood that the objective function can be other types of functions in addition to the above linear function y=ax+b, which is subject to implementation, and the present disclosure does not limit this.

[0080] In the present application, considering that the first projection distance corresponding to the projection image often does not match the projection distance in the association relationship, the target brightness corresponding to the first projection distance can be calculated by the above-mentioned method 1 or method 2, thereby improving the scope of application of the present application.

[0081] In an optional embodiment, the above Figure 1 The corresponding embodiment also includes the following process:

[0082] When it is detected that the first projection distance changes, the step of determining the target brightness corresponding to the changed first projection distance from the association relationship is re-executed.

[0083] In the present application, it is considered that the first projection distance may change during the projection process, and the change of the first projection distance may require recalibration of the projection image. For example, when the projection device is a handheld projector, the first projection distance may easily change.

[0084] Here, an accelerometer sensor (hereinafter referred to as G-Sensor) can be used. The G-Sensor can detect the change of the first projection distance in real time. Specifically, it can detect the acceleration and direction of the device when it moves. In addition, in addition to using the G-Sensor, in this application, analysis can also be performed based on the size change of the projection screen to determine whether the above-mentioned projection distance has changed. The specific method of detecting whether the first projection distance has changed is not specifically limited in this application, and it is subject to what can be implemented.

[0085] After detecting that the first projection distance has changed, the step of determining the target brightness corresponding to the changed first projection distance from the association relationship can be re-executed to reduce the power frequency interference stripes in the projection picture collected at this time, thereby facilitating automatic calibration of the projection picture.

[0086] In the present application, considering that the first projection distance may change during the projection process of the projection device, and the change in the first projection distance may require recalibration of the projection image, at this time, the target brightness corresponding to the first projection distance can be directly searched based on the association relationship, thereby improving the success rate of re-correcting the projection image.

[0087] like Figure 2 FIG. 1 is a flow chart of another method for controlling a projection device provided by the present application, wherein the method comprises steps S201 to S203, wherein:

[0088] S201: When it is detected that the target brightness is determined to fail or the automatic correction fails, a projection picture corresponding to the projection device at a first projection distance is obtained.

[0089] S202: Adjusting the optical and mechanical brightness of the projection device to a target brightness so that the projection image meets a preset condition.

[0090] S203: When the optical machine brightness is at the target brightness, perform a step of automatically correcting the projection image on the projection device.

[0091] In the present application, a camera module may be further provided in the above-mentioned projection device, and the camera module is used to collect the projection screen of the projection device, and the camera module may be a camera. Based on this, when it is detected that the target brightness is failed to be determined or the automatic correction fails, the projection screen may be collected by the camera module to redetermine the target brightness based on the projection screen, wherein when the optical machine brightness is at the target brightness, the clarity of the projection screen meets the preset condition. Here, the preset condition is the above-mentioned correction condition.

[0092] In specific implementation, it can be seen from the above that the number of power frequency interference stripes in the collected projection picture can be reduced by lowering the light machine brightness, and the light machine brightness can be gradually adjusted by using a brightness gradient downward method, and the projection picture can be collected in real time through the camera module during the adjustment process until the clarity of the collected projection picture meets the above correction conditions, and the light machine brightness at this time is obtained to determine the light machine brightness as the target brightness. Next, the light machine brightness can be set to the target brightness, thereby performing the step of automatic correction of the projection picture on the projection device.

[0093] In the present application, a camera module may also be provided in the projection device. When a failure to determine the target brightness or a failure in automatic correction is detected, the projection image of the projection device may be captured by the camera module, and the projection image may be made to meet preset conditions by adjusting the optical machine brightness, thereby improving the fault tolerance of the present application.

[0094] In an optional solution of the embodiment of the present invention, the optical and mechanical brightness of the projection device is adjusted to the target brightness so that the projection image meets the preset conditions. Specifically, Figure 3 FIG. 1 is a flow chart of a method for determining target brightness, wherein the method comprises steps S301-S305, wherein:

[0095] S301. Under the current projection image, obtain the initial brightness corresponding to the optical machine in the projection device.

[0096] S302: When the optical machine is at the initial brightness, extract image features of the projection image.

[0097] S303, obtaining target image features, wherein the target image features are extracted from a target projection screen, wherein the target projection screen is a projection screen projected by the projection device during a test phase before the device leaves the factory, and is an image stored when a preset condition is met.

[0098] In the present application, under the current projection screen, the optical-mechanical parameters of the projection device can be obtained, and based on the optical-mechanical parameters, the current brightness value of the optical machine can be read, and the brightness value can be determined as the above-mentioned initial brightness.

[0099] Next, when the optical machine is at the initial brightness, the image features of the projection picture can be extracted. Specifically, the image features corresponding to the projection picture can be extracted by an image analysis algorithm, and the image features include multiple feature points, wherein the feature points refer to points in the projection picture that have distinct characteristics and can effectively reflect the essential features of the projection picture, and can identify objects in the image.

[0100] Here, the projection picture can be preprocessed first. Considering that the projection picture is often affected by external environmental noise during digitization and transmission, the projection picture can be denoised first. Next, the denoised projection picture can be image enhanced to enhance the image features and improve the visual effect of the projection picture. The specific implementation methods of denoising and image enhancement processing are not limited in this application, and are subject to what can be implemented.

[0101] After the projection picture is preprocessed, feature points in the projection picture may be extracted to obtain image features of the projection picture. Here, the method of extracting feature points in the image is subject to practicability and is not specifically limited in the present disclosure.

[0102] After determining the image features of the projection picture, the target image features can be obtained, and the target image features are extracted from the target projection picture. Here, the target projection picture is a picture containing the same content as the projection picture, and the clarity of the target projection picture meets the correction condition, that is, the number of power frequency interference fringes in the target projection picture is small or there are no interference fringes.

[0103] It should be understood that, in the test phase before the projection device leaves the factory, in order to adapt to different calibration environments, at least one calibration image can be set for the projection device, and the calibration image can be projected by the projection device. Then, the number of power frequency interference fringes in the projection image captured by the camera module can be reduced by adjusting the optical machine brightness, so as to obtain the preset projection images corresponding to each calibration image. Next, the image features of each preset projection image can be extracted and stored in the query file.

[0104] Based on this, a correction image can be added to the multimedia data to be projected, so that when the projection device projects the multimedia data to be projected, the correction image is also projected into the projection area, so that the camera module can capture the projection picture corresponding to the correction image.

[0105] After determining the image features corresponding to the projection screen, the image features stored in the query file can be compared one by one to obtain target image features that match the image features of the projection screen, wherein the target image features can be the image features in the query file that have the highest similarity to the image features of the projection screen. Here, the preset projection screen corresponding to the target image features can be determined as the target projection screen.

[0106] In the present application, during the testing phase before the projection device leaves the factory, the projection device can adapt to a variety of possible correction environments, determine at least one preset projection screen, and store the image features of each preset projection screen in a query file, thereby facilitating the subsequent correction of the projection screen of the projection device by directly searching for the target image features corresponding to the image features of the current projection screen based on the query file.

[0107] S304: Determine the similarity between the image feature and the target image feature.

[0108] S305 , when the similarity is less than or equal to a preset value, re-execute the step of extracting the image features of the projection picture by adjusting the initial brightness until the similarity is greater than the preset value, thereby obtaining a target brightness.

[0109] In the present application, the above similarity can be used to indicate the proportion of power frequency interference stripes in the projection picture. Specifically, the higher the similarity between the image feature and the target image feature, the fewer power frequency interference stripes in the projection picture.

[0110] When determining the similarity, the initial brightness of the optical machine can be gradually adjusted multiple times according to a certain brightness gradient until the brightness of the optical machine reaches the target brightness. Specifically, after each adjustment of the initial brightness, the camera module can capture the current projection image of the projection device under the brightness of the optical machine and extract the image features of the projection image.

[0111] Next, the similarity between the extracted image features and the target image features may be determined, and the similarity may be compared with a preset value.

[0112] In an optional solution of the embodiment of the present invention, the similarity involved above can be calculated by the following formula:

[0113] Accordingly, the preset value corresponding to the above similarity can be set to: (80%).

[0114] For example, the calculated similarity is 85%, which is greater than the preset value 80%. It can be determined that the projection picture at this time meets the preset conditions. Therefore, the optical machine brightness corresponding to the projection picture with a similarity of 85% is used as the target brightness.

[0115] For another example, the calculated similarity is 62%, which is less than the preset value of 80%. It can be determined that the projection picture at this time does not meet the preset conditions. Therefore, the optical machine brightness can continue to be adjusted according to the above brightness gradient, and the similarity between the above image features and the target image features can be calculated in real time until the similarity is greater than or equal to the preset value.

[0116] In the present application, the initial brightness of the optical machine can be gradually adjusted multiple times according to a certain brightness gradient, and after each adjustment, the image features of the projected picture are re-extracted, and the image features are compared with the target image features to determine the target brightness, thereby avoiding the optical machine brightness dropping too quickly and missing the target brightness, which will adversely affect the subsequent correction of the projected picture.

[0117] Reference Figure 4 , shows a flow chart of another method for controlling a projection device provided by an embodiment of the present invention, which specifically includes the following steps:

[0118] S401, when the optical machine brightness is at the target brightness, performing a step of automatically correcting the projection image on the projection device;

[0119] The step of automatically correcting the projection image includes at least one of the following:

[0120] Focus, ladder calibration, scene entry or obstacle avoidance.

[0121] In the present application, any step can be selected from the above-mentioned focusing, ladder calibration, entering the screen and obstacle avoidance as the above-mentioned automatic correction step, and the correction order of each correction step when performing automatic correction can be determined according to the actual usage needs of the user. The present disclosure does not make any specific limitations on this.

[0122] It should be understood that each of the above-mentioned correction steps has a corresponding execution condition, and when the projection picture meets the execution condition, the correction step can be performed on the projection picture. Here, focusing refers to adjusting the projection lens of the projection device to find the point that makes the projection picture clearest. Therefore, the correction condition corresponding to focusing may be that the projection picture clarity is poor. Ladder calibration refers to adjusting the picture to a regular rectangle. Therefore, the execution condition corresponding to ladder calibration may be that the projection picture is not a regular rectangle. Entering the screen refers to adjusting the picture to the projection area. Therefore, the execution condition corresponding to entering the screen may be that the projection picture is not entirely located in the projection area. Obstacle avoidance refers to detecting obstacles in the projection area and adjusting the size of the projection picture based on the location of the obstacle to avoid the obstacle blocking the projection picture. Therefore, the execution condition corresponding to obstacle avoidance may be that there are obstacles in the projection area.

[0123] In the present application, the power frequency interference stripes of the projection screen can be reduced by adjusting the brightness of the projection screen so that the projection screen can achieve a higher clarity, and then the projection screen can be automatically corrected to provide users with a better viewing experience of the automatically corrected projection screen.

[0124] S402: After the projection device completes the step of automatically correcting the projection image, control the optical machine to switch from the target brightness to the initial brightness, wherein the target brightness is less than the initial brightness.

[0125] In the present application, it is considered that when calibrating the projection screen, the screen brightness of the projection screen is adjusted in order to reduce the number of power frequency interference stripes. However, the adjusted screen brightness may not be suitable for users viewing the projection screen.

[0126] Based on this, after the projection image is automatically calibrated, the initial brightness of the optical machine can be obtained, and the calibrated optical machine brightness can be restored to the first brightness. Here, the initial brightness is usually the optical machine brightness pre-set by the viewing object to meet its viewing needs.

[0127] In the present application, after the projection image is corrected, the optical machine brightness can be restored to the above-mentioned initial brightness, so that the image brightness of the projection image is restored to the image brightness before calibration, so as to improve the viewing experience of the viewing object when watching the projection image next time.

[0128] See also Figure 5 FIG. 5 is a flowchart of another method for controlling a projection device provided by the present application, wherein the method includes steps S501 to S504, wherein:

[0129] S501: Acquire a first projection distance through the TOF sensor.

[0130] In this application, the specific implementation method of obtaining the first projection distance by using the TOF sensor is shown in the above Figure 1 Step S101 in will not be repeated here.

[0131] S502: Query the above association relationship to determine a target brightness that matches the above first projection.

[0132] In the present application, if a projection distance matching the first projection distance is found in the association relationship, the optical brightness associated with the projection distance can be determined as the target brightness. Figure 1 The method 1 or the method 2 in the corresponding embodiment determines the target brightness, which will not be described in detail here.

[0133] S503: Based on the target brightness, adjust the optical and mechanical brightness of the projection device.

[0134] S504: When the light machine brightness reaches the target brightness, the brightness adjustment operation ends.

[0135] In the present application, when the optical machine brightness is at the target brightness, the projector device can be automatically corrected for the projection screen. For specific steps of automatically correcting the projection screen, refer to the above Figure 1 Step S107 in will not be repeated here.

[0136] In summary, in the present application, the current first projection distance of the projection device can be first obtained, and the target brightness corresponding to the first projection distance can be determined from the association relationship to control the optical machine of the projection device to adjust to the target brightness. When the optical machine brightness is at the target brightness, the step of automatic correction of the projection screen can be performed on the projection device. Based on this, the present application can reduce the power frequency interference stripes of the projection screen by adjusting the brightness of the optical machine so that the projection screen achieves a higher clarity, and then perform the step of automatic correction of the projection screen to provide users with a better experience of viewing the automatically corrected projection screen.

[0137] Those skilled in the art will appreciate that, in the above method of specific implementation, the order in which the steps are written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of the steps should be determined by their functions and possible internal logic.

[0138] Based on the same inventive concept, the present application also provides a projection device corresponding to the control method of the projection device. Since the principle of solving the problem by the device in the present application is similar to the control method of the above-mentioned projection device in the present application, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be repeated.

[0139] Reference Figure 6 As shown, it is a schematic diagram of a projection device provided by the present application, and the projection device includes: an acquisition module 61, a determination module 62, a control module 66, and a correction module 64; wherein,

[0140] An acquisition module 61 is used to acquire a current first projection distance of a projection device;

[0141] A determination module 62, configured to determine a target brightness corresponding to the first projection distance from the association relationship;

[0142] A control module 63 controls the optical machine of the projection device to adjust to the target brightness;

[0143] The correction module 64 performs a step of automatically correcting the projection image on the projection device when the optical machine brightness is at the target brightness.

[0144] In the present application, the current first projection distance of the projection device can be obtained first, and the target brightness corresponding to the first projection distance can be determined from the association relationship to control the optical machine of the projection device to adjust to the target brightness. When the optical machine brightness is at the target brightness, the step of automatically correcting the projection screen can be performed on the projection device. Based on this, the present application can reduce the power frequency interference stripes of the projection screen by adjusting the brightness of the optical machine so that the projection screen achieves a higher clarity, and then perform the step of automatically correcting the projection screen so that the user has a better experience of viewing the automatically corrected projection screen.

[0145] In a possible implementation manner, the projection device pre-stores the association relationship during a testing phase before the device leaves the factory;

[0146] The association relationship includes a plurality of corresponding relationships between different projection distances and light machine brightness;

[0147] The optical-mechanical brightness in the association relationship satisfies a preset condition when the projection screen is projected when the projection device is at a corresponding projection distance.

[0148] In a possible implementation manner, the device further includes a matching module 65, configured to:

[0149] When a projection distance corresponding to the first projection distance is not matched from the association relationship, the optical machine brightness corresponding to the projection distance with the smallest difference from the first projection distance in the association relationship is used as the target brightness.

[0150] In a possible implementation manner, the device further includes a detection module 66, which is used to:

[0151] When it is detected that the first projection distance changes, the step of determining the target brightness corresponding to the changed first projection distance from the association relationship is re-executed.

[0152] In a possible implementation manner, the device further includes an adjustment module 67, which is used to:

[0153] When it is detected that the determination of the target brightness fails or the automatic correction fails, obtaining a projection picture corresponding to the projection device at a first projection distance;

[0154] By adjusting the optical and mechanical brightness of the projection device to a target brightness, the projection image meets the preset conditions;

[0155] When the optical machine brightness is at the target brightness, a step of automatically correcting the projection image is performed on the projection device.

[0156] In a possible implementation manner, the adjustment module 67 is further configured to:

[0157] Under the current projection picture, obtaining the initial brightness corresponding to the optical machine in the projection device;

[0158] When the optical machine is at the initial brightness, extracting image features of the projection picture;

[0159] A target image feature is obtained, where the target image feature is extracted from a target projection screen, where the target projection screen is a projection screen projected by the projection device during a test phase before the device leaves the factory, and is an image stored when a preset condition is met.

[0160] In a possible implementation manner, the adjustment module 67 is further configured to:

[0161] Determining the similarity between the image feature and the target image feature;

[0162] When the similarity is less than or equal to a preset value, the initial brightness is adjusted to re-execute the step of extracting the image features of the projection picture until the similarity is greater than the preset value to obtain the target brightness.

[0163] In a possible implementation manner, the step of automatically correcting the projection image includes at least one of the following:

[0164] Focus, ladder calibration, scene entry or obstacle avoidance.

[0165] In a possible implementation manner, the device further includes a switching module 68, which is used to:

[0166] After the projection device completes the step of automatically correcting the projection image, the optical machine is controlled to switch from the target brightness to the initial brightness, wherein the target brightness is less than the initial brightness.

[0167] Get the preset brightness adjustment gradient;

[0168] Based on the brightness adjustment gradient, the first brightness of the projection image is adjusted to a second brightness.

[0169] For descriptions of the processing flow of each unit in the device and the interaction flow between each unit, reference may be made to the relevant descriptions in the above method embodiments, which will not be described in detail here.

[0170] Corresponds to Figure 1 The control method of the projection device in the present application also provides another projection device 700, such as Figure 7 As shown, it is a schematic diagram of the structure of the projection device 700 provided in this application, including:

[0171] Processor 71, memory 72, and bus 73; memory 72 is used to store execution instructions, including internal memory 721 and external memory 722; the internal memory 721 is also called internal memory, which is used to temporarily store the operation data in the processor 71 and the data exchanged with the external memory 722 such as a hard disk. The processor 71 exchanges data with the external memory 722 through the internal memory 721. When the computer device 700 is running, the processor 71 communicates with the memory 72 through the bus 73, so that the processor 71 executes the following instructions:

[0172] Get the current first projection distance of the projection device;

[0173] Determining a target brightness corresponding to the first projection distance from the association relationship;

[0174] Controlling the optical machine of the projection device to adjust to the target brightness;

[0175] When the optical machine brightness is at the target brightness, a step of automatically correcting the projection image is performed on the projection device.

[0176] The present application also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the control method of the projection device described in the above method embodiment are executed. The storage medium can be a volatile or non-volatile computer-readable storage medium.

[0177] The present application also provides a computer program product, which carries a program code. The instructions included in the program code can be used to execute the steps of the control method of the projection device described in the above method embodiment. For details, please refer to the above method embodiment, which will not be repeated here.

[0178] The computer program product may be implemented in hardware, software or a combination thereof. In one optional embodiment, the computer program product is implemented as a computer storage medium. In another optional embodiment, the computer program product is implemented as a software product, such as a software development kit (SDK).

[0179] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. In the several embodiments provided in the present disclosure, it should be understood that the disclosed system, device and method can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of the device or unit can be electrical, mechanical or other forms.

[0180] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0181] In addition, each functional unit in each embodiment of the present disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0182] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present disclosure, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present disclosure. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0183] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present disclosure, which are used to illustrate the technical solutions of the present disclosure, rather than to limit them. The protection scope of the present disclosure is not limited thereto. Although the present disclosure is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present disclosure, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the present application, and should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A method for controlling a projection device, characterized in that: include: Get the current first projection distance of the projection device; Determining a target brightness corresponding to the first projection distance from the association relationship; Controlling the optical machine of the projection device to adjust to the target brightness; When the optical machine brightness is at the target brightness, a step of automatically correcting the projection image is performed on the projection device.

2. The method according to claim 1, characterized in that The projection device stores the association relationship in advance during a test phase before the device leaves the factory; The association relationship includes a plurality of corresponding relationships between different projection distances and light machine brightness; The optical-mechanical brightness in the association relationship satisfies a preset condition when the projection screen is projected when the projection device is at a corresponding projection distance.

3. The method according to claim 1, characterized in that The method further comprises: When a projection distance corresponding to the first projection distance is not matched from the association relationship, the optical machine brightness corresponding to the projection distance with the smallest difference from the first projection distance in the association relationship is used as the target brightness.

4. The method according to claim 1, characterized in that: The method further comprises: When it is detected that the first projection distance changes, the step of determining the target brightness corresponding to the changed first projection distance from the association relationship is re-executed.

5. The method according to claim 1, characterized in that The method further comprises: When it is detected that the determination of the target brightness fails or the automatic correction fails, obtaining a projection picture corresponding to the projection device at a first projection distance; By adjusting the optical and mechanical brightness of the projection device to a target brightness, the projection image meets the preset conditions; When the optical machine brightness is at the target brightness, a step of automatically correcting the projection image is performed on the projection device.

6. The method according to claim 5, characterized in that The method further comprises: Under the current projection picture, obtaining the initial brightness corresponding to the optical machine in the projection device; When the optical machine is at the initial brightness, extracting image features of the projection picture; A target image feature is obtained, where the target image feature is extracted from a target projection screen, where the target projection screen is a projection screen projected by the projection device during a test phase before the device leaves the factory, and is an image stored when a preset condition is met.

7. The method according to claim 6, characterized in that The method further comprises: Determining the similarity between the image feature and the target image feature; When the similarity is less than or equal to a preset value, the initial brightness is adjusted to re-execute the step of extracting the image features of the projection picture until the similarity is greater than the preset value to obtain the target brightness.

8. The method according to claim 1, characterized in that The step of automatically correcting the projection image includes at least one of the following: Focus, ladder calibration, scene entry or obstacle avoidance.

9. The method according to any one of claims 1 to 8, characterized in that: The method further comprises: After the projection device completes the step of automatically correcting the projection image, the optical machine is controlled to switch from the target brightness to the initial brightness, wherein the target brightness is less than the initial brightness.

10. A projection device, characterized in that: include: An acquisition module, used to acquire a current first projection distance of the projection device; A determination module, configured to determine a target brightness corresponding to the first projection distance from the association relationship; A control module controls the optical machine of the projection device to adjust to the target brightness; The correction module performs the step of automatically correcting the projection image on the projection device when the optical machine brightness is at the target brightness.

11. A projection device, characterized in that: include: A processor and a memory, wherein the processor is used to execute a control program of the projection device stored in the memory to implement the control method of the projection device according to any one of claims 1 to 9.

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