Frame transfer CCD-based exposure time-adjustable imaging driving method, computer equipment, readable storage medium and program product

Abstract

The invention relates to an exposure-time-adjustable imaging driving method based on a frame transfer CCD, computer equipment, a readable storage medium and a program product, the imaging driving method is executed by utilizing an imaging area and a storage area of the frame transfer CCD, and exposure data is divided into invalid exposure data and valid exposure data. A single complete imaging period is divided into an invalid frame and an effective frame; the invalid frame comprises a frame frequency adjustment section T1; during the first frame transfer section T2, invalid exposure data is transferred from the imaging area to the storage area; the frame discarding section T3 is used for discarding invalid exposure data in the storage area during the frame discarding section T3; the effective frame comprises an effective exposure section T4, and the starting time of the effective exposure section T4 is in the period of the frame discarding section T3; a second frame transfer section T5 in which the effective exposure data is transferred from the imaging area to the storage area; and a frame read-out section T6 in which the effective exposure data is read out. According to the invention, the limitation of the minimum exposure time T3 in the traditional time sequence is broken through, and the frame frequency can be kept unchanged through the adjustment of the frame frequency adjustment section T1.

Description

Technical Field

[0001] The present application relates to the technical field of photoelectric signal processing, and in particular to an imaging driving method, a computer device, a readable storage medium and a program product based on a frame transfer CCD with adjustable exposure time. Background Art

[0002] As a high-quality photosensitive device in the ultraviolet-visible near-infrared band, CCD (Charge Coupled Device) has the advantages of low noise, large dynamic range, and high sensitivity. It is widely used in various active and passive spectral imaging detection on the ground or in space. With the continuous deepening of research on various spectral imaging instruments and the continuous enrichment of application scenarios, various instruments not only need to adapt to weak target scenes, but also need to meet the needs of strong target imaging. Therefore, it is necessary to adjust the exposure time of the CCD in the imaging system in real time for different target scenes to obtain spectral images with high signal-to-noise ratio. In addition, the frame rate of the imaging system usually needs to remain unchanged. For example, during aerial photography, if the system frame rate changes due to exposure time adjustment, it will not only affect the spatial resolution of the system imaging, but also add unnecessary trouble to the later image processing. Summary of the invention

[0003] In order to further optimize the imaging drive of the CCD, the present application provides an imaging drive method with adjustable exposure time based on a frame transfer CCD.

[0004] The present application is based on an imaging driving method with adjustable exposure time based on a frame transfer CCD, which is executed using an imaging area and a storage area of ​​the frame transfer CCD, wherein exposure data is divided into invalid exposure data and valid exposure data, and a single complete imaging cycle is divided into invalid frames and valid frames;

[0005] The invalid frame includes:

[0006] Frame rate adjustment segment T1, used to match the frame rate;

[0007] A first frame transfer section T2, during which the invalid exposure data is transferred from the imaging area to the storage area;

[0008] a frame discarding section T3, during which the invalid exposure data in the storage area is discarded;

[0009] The valid frame includes:

[0010] An effective exposure segment T4, the start time of the effective exposure segment T4 is during the frame discarding segment T3;

[0011] a second frame transfer section T5, during which the effective exposure data is transferred from the imaging area to the storage area;

[0012] Frame readout segment T6, during which the effective exposure data is read out.

[0013] Optionally, the start time of the frame discarding section T3 and the start time of the effective exposure section T4 in the driving timing are consistent.

[0014] Optionally, the frame discarding segment T3 and the second frame transfer segment T5 have overlapping driving timings.

[0015] Optionally, the frame discarding section T3 is greater than the effective exposure section T4.

[0016] Optionally, the sum of the frame rate adjustment section T1 and the effective exposure section T4 is a constant value;

[0017] The first frame transfer segment T2, the second frame transfer segment T5, and the frame readout segment T6 are all constant values.

[0018] Optionally, the invalid frame includes, in sequence: the frame frequency adjustment segment T1, the first frame transfer segment T2, and the frame discarding segment T3;

[0019] The effective frame includes in sequence: the effective exposure segment T4, the second frame transfer segment T5, and the frame readout segment T6.

[0020] Optionally, during the second frame transfer T5, the original storage area data is transferred row by row to the read register.

[0021] Optionally, the process of discarding the invalid exposure data includes transferring the invalid exposure data row by row to a readout register for discarding.

[0022] The present application also provides a computer device, including a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the imaging driving method with adjustable exposure time based on the frame transfer CCD described in the present application.

[0023] The present application also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the imaging driving method with adjustable exposure time based on a frame transfer CCD described in the present application are implemented.

[0024] The present application also provides a computer program product, including computer instructions, which, when executed by a processor, implement the steps of the imaging driving method with adjustable exposure time based on a frame transfer CCD described in the present application.

[0025] The start time of the effective exposure section T4 of the present application is set during the frame discarding section T3, that is, the driving signals of the frame discarding T3 and the frame transfer T5 overlap. This design can simultaneously implement the transfer and discarding of invalid exposure data in the storage area and the transfer of effective exposure data in the imaging area, which can break through the limitation of the minimum exposure time T3 in the traditional timing, and realize the free adjustment of the exposure time without changing the imaging frame rate, and even compress the exposure time to 0. In addition, the frame rate can be kept unchanged through the adaptive adjustment of the frame rate adjustment section T1. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A driving timing diagram of an imaging driving method with adjustable exposure time based on a frame transfer CCD in one embodiment of the present application;

[0027] Figure 2 A schematic diagram of an imaging cycle of an imaging driving method based on an adjustable exposure time of a frame transfer CCD in an embodiment of the present application. ;

[0028] Figure 3 Schematic diagram of the conventional imaging cycle of the frame transfer CCD47-20;

[0029] Figure 4 Schematic diagram of the conventional imaging cycle of the frame transfer CCD47-20;

[0030] Figure 5 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0032] An embodiment of the present application provides an imaging driving method with adjustable exposure time based on a frame transfer CCD (hereinafter referred to as an imaging driving method), which can realize variable exposure with a minimum exposure time of 0 and imaging fixed frame rate. The frame transfer CCD used in the implementation process is CCD47-20 of E2V Company, and the device related parameters are shown in the following table.

[0033] E2V Frame Transfer CCD47-20 Related Parameters

[0034] Parameter name CCD47-20 Spectral response range 200nm~1050nm Effective pixels 1024×1024 Pixel size 13×13μm Imaging area size 13.3×13.3mm Device package size 22.7×42.0mm Maximum read frequency 5MHz (dual ports can output simultaneously) Dynamic Range 50000:1 Sensitivity <![CDATA[4.5μV / e - ]]> Maximum output voltage 540mV Maximum storage data volume <![CDATA[120k e - / pixel]]> Readout noise (@253K, @1MHz) <![CDATA[6rms e - / pixel]]> Dark data@293K <![CDATA[20k e - / pixel / s]]> Dark data non-uniformity @293K <![CDATA[2k e - / pixel / s]]>

[0035] See also Figure 1 The imaging driving method of this embodiment is implemented by taking CCD47-20 as an example, and the driving timing is shown as follows: Figure 1As shown, I is the CCD imaging area clock signal, S is the CCD storage area clock signal, DG is the CCD line discard signal, R is the CCD readout register clock signal, and OS is the CCD output signal.

[0036] Specifically, in the figure, I represents the CCD47-20 imaging area clock signal Iφ1, Iφ2, Iφ3, S represents the CCD47-20 storage area clock signal Sφ1, Sφ2, Sφ3, DG is the CCD47-20 row discard signal, R represents the CCD47-20 read register clock signal Rφ1, Rφ2, Rφ3, OS is the CCD47-20 output signal, and the CCD47-20 output Reset signal is omitted in the figure.

[0037] The imaging driving method of this embodiment is executed using the imaging area and storage area of ​​the frame transfer CCD, and the exposure data is divided into invalid exposure data and valid exposure data, and a single complete imaging cycle is divided into invalid frames and valid frames. The invalid frame includes a frame frequency adjustment segment T1, a first frame transfer segment T2, and a frame discarding segment T3. The frame frequency adjustment segment T1 is used to match the frame frequency. During the first frame transfer segment T2, the invalid exposure data is transferred from the imaging area to the storage area. During the frame discarding segment T3, the invalid exposure data in the storage area is discarded. The valid frame includes a valid exposure segment T4, a second frame transfer segment T5, and a frame readout segment T6. The start time of the valid exposure segment T4 is during the frame discarding segment T3. During the second frame transfer segment T5, the valid exposure data is transferred from the imaging area to the storage area. The valid exposure data is read out during the frame readout segment T6.

[0038] In this embodiment, the start time of the effective exposure section T4 is set during the frame discarding section T3, that is, the driving signals of the frame discarding T3 and the frame transfer T5 overlap. This design can simultaneously implement the transfer and discarding of invalid exposure data in the storage area and the transfer of effective exposure data in the imaging area, which can break through the limitation of the minimum exposure time T3 in the traditional timing, and realize the free adjustment of the exposure time without changing the imaging frame rate, and even compress the exposure time to 0. In addition, the frame rate can be kept unchanged through the adaptive adjustment of the frame rate adjustment section T1.

[0039] A complete imaging cycle in this embodiment can be expressed as T1+T2+T4+T5+T6, where T2, T5, and T6 are fixed values, and the sum of T1 and T4 is a fixed value. In conjunction with the frame rate adjustment segment T1, the exposure time can be adjusted without changing the CCD imaging frame rate. Adjustments can be made based on the system imaging frame rate and the strength of the target: when the target is strong, reduce the exposure time T4 and increase T1 to maintain the imaging frame rate unchanged, and vice versa. This method can achieve large dynamic range imaging of the target in a fixed frame rate mode, and can effectively improve the system output image signal-to-noise ratio.

[0040] The working timing of the CCD continuously cycles from the "frame frequency adjustment section" to the "frame readout section" in the above order to achieve fixed frame frequency imaging of the system. In this embodiment, the driving timing design during the frame discarding section T3 and the second frame transfer section T5 overlaps, and the time difference between the two driving openings is the effective exposure section T4. This design cleverly uses the driving timing during the second frame transfer T5 to continue to transfer the invalid exposure data of the CCD storage area that has not been completely transferred and discarded during the effective exposure T4 to the readout register for discarding, giving full play to the flexible driving characteristics of the frame transfer CCD. The imaging driving method provided in this embodiment can simultaneously implement the transfer and discarding of invalid exposure data in the storage area and the transfer of effective exposure data in the imaging area, which can break through the limitation of the minimum exposure time under traditional driving - frame discarding T3, and when the driving opening time of the frame discarding section T3 and the second frame transfer section T5 coincide, the effective exposure time T4 can even be compressed to 0.

[0041] The specific solution of this embodiment can be further understood through the following division of the time periods T1 to T6 and the work contents during the periods.

[0042] The frame rate adjustment segment T1 has an adjustable duration and is used to match the frame rate of the CCD imaging system. When the target is weak, the effective exposure time T4 can be increased, while the frame rate adjustment time T1 can be reduced to ensure that the sum of T1 and T4 is a constant value to maintain the system frame rate unchanged, and vice versa. During T1, the CCD imaging area clock signal I, the storage area clock signal S, the row discard signal DG and the readout register clock signal R are all inoperative, and the CCD output signal OS has no valid data; during T1, the CCD imaging area is normally exposed, and this segment is defined as invalid exposure, and the corresponding exposure data will be transferred to the storage area line by line with the first frame transfer for clearing.

[0043] The first frame transfer segment has a fixed duration of T2. During this period, signals I and S work to transfer the CCD imaging area data to the storage area line by line. At the same time, the storage area data is transferred to the readout register line by line. Signal R does not work, and OS has no valid output. Since the CCD imaging area has been in normal exposure during the frame readout segment T6 in the previous imaging cycle and is also defined as invalid exposure, the first frame transfer in the current imaging cycle needs to transfer the accumulated invalid exposure data during the frame readout segment T6 in the previous imaging cycle and the frame rate adjustment segment T1 in the current imaging cycle to the CCD storage area, and then clear it.

[0044] The frame discarding segment is T3 long, and the second frame transfer segment is T5 long. Both segments are fixed. To break through the limitation of the minimum exposure time T3 in the traditional timing, the driving timing of the frame discarding segment T3 and the second frame transfer segment T5 overlaps. The time difference between the opening of the two driving timings is the effective exposure segment T4. By cleverly using the driving timing during the second frame transfer T5, the invalid exposure data in the CCD storage area that has not been completely transferred and discarded during the effective exposure T4 is further transferred to the readout register for discarding. When the opening time of the driving timing of the frame discarding segment T3 and the second frame transfer segment T5 is completely overlapped, the effective exposure time T4 can be compressed to 0. During T3, the signal I does not work, and S During the frame discarding segment T3 and the second frame transfer segment T5, the signal R does not work, and the OS has no valid output.

[0045] The effective exposure segment duration T4 is used to adjust the effective exposure time of the CCD. It is the time difference between the frame discarding segment T3 and the second frame transfer segment T5 when the driving timing is turned on. This duration is less than the minimum exposure time that can be achieved by the traditional driving method. During T4, the CCD imaging area is normally exposed and is defined as effective exposure. When the driving timing turn-on time of the frame discarding segment T3 and the second frame transfer segment T5 completely coincides, the effective exposure time T4 is reduced to 0. When the target is strong, the effective exposure time T4 is reduced, and the frame rate adjustment time T1 is increased to ensure that the sum of T1 and T4 is a constant to maintain the system frame rate unchanged, and vice versa.

[0046] The frame readout segment has a fixed duration of T6. During this period, signal S works to transfer the valid exposure data of the CCD storage area to the readout register line by line. At the same time, signal R works to read out the data in the readout register one by one. OS outputs the valid exposure data of the storage area, and signals I and DG do not work. During T6, the CCD imaging area is normally exposed, which is defined as invalid exposure. The exposure result is included in the next imaging cycle and will be transferred to the storage area line by line during the first frame transfer T2 of the next imaging cycle together with the invalid exposure during the frame rate adjustment segment T1 in the next imaging cycle, and then cleared.

[0047] At this point, the system completes one imaging, and the CCD imaging cycle T = T1 + T2 + T4 + T5 + T6, among which T2, T3, T5 and T6 are only affected by the pulse width of the relevant driving signal. The setting of the pulse width of the relevant driving signal not only affects the imaging quality of the CCD, but also affects the adjustment range of the system exposure time. In the early stage of system design, it is necessary to comprehensively consider the imaging quality, imaging frame rate, and exposure time adjustment range to determine the pulse width of the CCD related driving signal, so that T2, T3, T5, and T6 can be fixed; and the sum of T1 and T4 needs to be a constant value, so as to ensure that the system imaging cycle is fixed to maintain the system frame rate unchanged, and then set T1 and T4 according to the system imaging frame rate and the target radiation intensity: when the target radiation is strong, it is necessary to reduce the supplementary exposure time T4 and increase the frame rate adjustment time T1, and vice versa. According to the above implementation process, it can be known that the effective exposure time of the fixed frame rate imaging system is T4, which is determined by the driving timing start time difference between the frame discarding segment T3 and the second frame transfer segment T5, and is less than the frame discarding segment duration T3.

[0048] See also Figure 3 and Figure 4 ,like Figure 3 In the "conventional imaging cycle diagram 1" shown, the effective exposure time of the system is the "frame readout" time + the "supplementary exposure" time. When the supplementary exposure time is 0, the "conventional imaging cycle diagram 1" reaches the minimum exposure time, that is, the "frame readout" time. Considering that during the "frame readout" period, not only the storage area data needs to be transferred to the readout register row by row, but also the data in the register needs to be read out element by element, in contrast, during the "frame discard" period, only the CCD storage area data needs to be transferred to the readout register row by row, and then the entire row can be directly discarded, which makes the "frame discard" time much shorter than the "frame readout" time. Figure 3 The traditional imaging drive cycle of CCD47-20 shown in the figure, this embodiment adds a frame rate adjustment segment, a frame transfer segment and a frame discard segment in the imaging cycle, wherein the frame rate adjustment segment is used to stabilize the frame rate of the imaging system, and the first frame transfer segment and the frame discard segment are used to transfer and clear invalid exposure data.

[0049] And as Figure 4 The effective exposure time of the system in the "Traditional Imaging Cycle Schematic 2" shown is the "frame discard" time + the "supplementary exposure" time. When the supplementary exposure time is 0, the "Traditional Imaging Cycle Schematic 2" reaches the minimum exposure time, that is, the "frame discard" time, which is consistent with the longest exposure time that can be achieved in each embodiment of the present application, that is, when the driving timing of the frame discard segment T3 and the second frame transfer segment T5 just do not overlap; therefore, the frame transfer CCD driving method proposed in the present invention can achieve a shorter exposure time while maintaining the imaging frame rate unchanged. Compared to Figure 4In the traditional imaging drive cycle of CCD47-20 shown in the figure, the drive timing of the frame discarding segment T3 and the second frame transfer segment T5 overlap in this embodiment, and the time difference between the opening of the two drive timings is the effective exposure segment T4. The present application cleverly uses the drive timing during the second frame transfer T5 to transfer the invalid exposure data of the CCD storage area that has not been completely transferred and discarded during the effective exposure T4 to the readout register for discarding, so as to break through the limitation of the minimum exposure time in the traditional timing - frame discarding T3. When the opening time of the drive timing of the frame discarding segment T3 and the second frame transfer segment T5 completely overlaps, the effective exposure time can be compressed to 0.

[0050] The imaging drive method of each embodiment of the present application can realize variable exposure with a minimum exposure time of 0, and imaging with a fixed frame rate. The frame transfer timing is used to simultaneously realize the line-by-line transfer of data in the CCD imaging area and the storage area. By adjusting the driving timing of the CCD and cooperating with the invalid frame discarding function (the line discarding function of the CCD), the minimum exposure time limit can be broken. The exposure time can be adjusted without changing the imaging frame rate of the system. The exposure time can even be compressed to 0 without the need for a shutter. The imaging drive method with the characteristics of variable exposure and fixed frame rate is suitable for various CCD imaging system designs.

[0051] The imaging driving method of each embodiment of the present application improves the adaptability of the imaging system to strong target scenes, realizes large dynamic range target imaging, and can be applied to other frame transfer CCD imaging systems.

[0052] In one embodiment, a computer device is provided. The computer device may be a terminal, for example, an electronic camera or an electronic device with a built-in camera function. The internal structure diagram thereof may be as follows: Figure 5 shown.

[0053] The computer device includes a processor, a memory, a network interface, a display screen and an input device connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities, specifically an image processor. 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 the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, an imaging driving method with adjustable exposure time based on a frame transfer CCD is implemented. The display screen of the computer device 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 covered on the display screen, or a key, trackball or touchpad set on the computer device housing, or an external keyboard, touchpad or mouse, etc.

[0054] In one embodiment, a computer device is provided, comprising a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, an imaging driving method with adjustable exposure time based on a frame transfer CCD is implemented, wherein the imaging driving method is executed using an imaging area and a storage area of ​​the frame transfer CCD, and the exposure data is divided into invalid exposure data and valid exposure data, and a single complete imaging cycle is divided into invalid frames and valid frames. The invalid frame includes a frame frequency adjustment segment T1, a first frame transfer segment T2, and a frame discarding segment T3. The frame frequency adjustment segment T1 is used to match the frame frequency. During the first frame transfer segment T2, the invalid exposure data is transferred from the imaging area to the storage area. During the frame discarding segment T3, the invalid exposure data in the storage area is discarded. The valid frame includes a valid exposure segment T4, a second frame transfer segment T5, and a frame readout segment T6. The start time of the valid exposure segment T4 is during the frame discarding segment T3. During the second frame transfer segment T5, the valid exposure data is transferred from the imaging area to the storage area. During the frame readout segment T6, the valid exposure data is read out.

[0055] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, an imaging driving method with adjustable exposure time based on a frame transfer CCD is implemented. The imaging driving method is executed using an imaging area and a storage area of ​​the frame transfer CCD. Exposure data is divided into invalid exposure data and valid exposure data. A single complete imaging cycle is divided into invalid frames and valid frames. The invalid frame includes a frame frequency adjustment segment T1, a first frame transfer segment T2, and a frame discarding segment T3. The frame frequency adjustment segment T1 is used to match the frame frequency. During the first frame transfer segment T2, invalid exposure data is transferred from the imaging area to the storage area. During the frame discarding segment T3, invalid exposure data in the storage area is discarded. The valid frame includes a valid exposure segment T4, a second frame transfer segment T5, and a frame readout segment T6. The start time of the valid exposure segment T4 is during the frame discarding segment T3. During the second frame transfer segment T5, valid exposure data is transferred from the imaging area to the storage area. During the frame readout segment T6, valid exposure data is read out.

[0056] In one embodiment, a computer program product is provided, including computer instructions, which, when executed by a processor, implement an imaging driving method with adjustable exposure time based on a frame transfer CCD, wherein the imaging driving method is executed using an imaging area and a storage area of ​​the frame transfer CCD, wherein exposure data is divided into invalid exposure data and valid exposure data, and a single complete imaging cycle is divided into invalid frames and valid frames. The invalid frame includes a frame frequency adjustment segment T1, a first frame transfer segment T2, and a frame discarding segment T3. The frame frequency adjustment segment T1 is used to match the frame frequency. During the first frame transfer segment T2, the invalid exposure data is transferred from the imaging area to the storage area. During the frame discarding segment T3, the invalid exposure data in the storage area is discarded. The valid frame includes a valid exposure segment T4, a second frame transfer segment T5, and a frame readout segment T6. The start time of the valid exposure segment T4 is during the frame discarding segment T3. During the second frame transfer segment T5, the valid exposure data is transferred from the imaging area to the storage area. During the frame readout segment T6, the valid exposure data is read out.

[0057] In the present embodiment, the computer program product includes a program code portion for executing the steps of the imaging driving method based on the adjustable exposure time of the frame transfer CCD in each embodiment of the present application when the computer program product is executed by one or more computing devices. The computer program product can be stored on a computer-readable recording medium. The computer program product can also be provided via a data network (e.g., via a RAN, via the Internet and / or via an RBS) for downloading. Alternatively or additionally, the method can be encoded in a field programmable gate array (FPGA) and / or an application specific integrated circuit (ASIC), or the functionality can be provided for downloading by means of a hardware description language.

[0058] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, storage, database, or other medium used in the embodiments provided in the present application can include non-volatile and / or volatile memories. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM), etc.

[0059] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification. When the technical features in different embodiments are embodied in the same drawing, the drawing can be regarded as simultaneously disclosing the combination examples of the respective embodiments involved.

[0060] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An imaging driving method based on a frame transfer CCD with adjustable exposure time, which is performed using an imaging area and a storage area of ​​the frame transfer CCD, characterized in that: The exposure data is divided into invalid exposure data and valid exposure data, and a single complete imaging cycle is divided into invalid frames and valid frames; The invalid frame includes: Frame rate adjustment segment T1, used to match the frame rate; a first frame transfer section T2, during which the invalid exposure data is transferred from the imaging area to the storage area; a frame discarding section T3, during which the invalid exposure data in the storage area is discarded; The valid frame includes: An effective exposure segment T4, the start time of the effective exposure segment T4 is during the frame discarding segment T3; a second frame transfer section T5, during which the effective exposure data is transferred from the imaging area to the storage area; Frame readout segment T6, during which the effective exposure data is read out.

2. The imaging driving method with adjustable exposure time based on frame transfer CCD as claimed in claim 1, characterized in that: The start time of the frame discarding section T3 and the start time of the effective exposure section T4 in the driving timing are consistent.

3. The imaging driving method with adjustable exposure time based on frame transfer CCD as claimed in claim 2, characterized in that: The frame discarding section T3 is longer than the effective exposure section T4; the frame discarding section T3 and the second frame transfer section T5 have a driving timing overlap.

4. The imaging driving method with adjustable exposure time based on frame transfer CCD as claimed in claim 1, characterized in that: The sum of the frame rate adjustment section T1 and the effective exposure section T4 is a constant value; The first frame transfer segment T2, the second frame transfer segment T5, and the frame readout segment T6 are all constant values.

5. The imaging driving method with adjustable exposure time based on frame transfer CCD as claimed in claim 1, characterized in that: The invalid frame includes, in sequence: the frame frequency adjustment segment T1, the first frame transfer segment T2, and the frame discarding segment T3; The effective frame sequentially includes: the effective exposure segment T4, the second frame transfer segment T5, and the frame readout segment T6.

6. The imaging driving method with adjustable exposure time based on frame transfer CCD as claimed in claim 1, characterized in that: During the second frame transfer T5, the data in the original storage area are simultaneously transferred row by row to the read-out register.

7. The imaging driving method with adjustable exposure time based on frame transfer CCD as claimed in claim 1, characterized in that: The process of discarding the invalid exposure data includes transferring the invalid exposure data row by row to a readout register for discarding.

8. Computer device, characterized in that The invention comprises a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the imaging driving method according to any one of claims 1 to 7.

9. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the imaging driving method according to any one of claims 1 to 7 are implemented.

10. A computer program product comprising computer instructions, characterized in that When the computer instructions are executed by a processor, the steps of the imaging driving method according to any one of claims 1 to 7 are implemented.

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