CN114390187A - Passive image acquisition equipment and data reading method thereof, storage medium and terminal - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/66—Remote control of cameras or camera parts, e.g. by remote control devices
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Abstract
A passive image acquisition device and a data reading method, a storage medium and a terminal thereof are provided, wherein the method comprises the following steps: responding to the completion of the data sampling operation of the previous frame of image, and continuing to perform the data sampling operation of the next frame of image on the pixel array of the passive image acquisition equipment; detecting the data caching state of a caching unit; and discarding or outputting the data of the next frame of image to the buffer unit according to the data buffer state, wherein the discarded data of the next frame of image is an analog signal or a digital signal. The scheme provided by the invention can greatly reduce the data reading delay, reduce the control reading and writing time of the external passive image acquisition equipment, and shorten the time for acquiring multi-frame images.
Description
Technical Field
The invention relates to the technical field of image acquisition, in particular to passive image acquisition equipment, a data reading method thereof, a storage medium and a terminal.
Background
Conventional image pickup apparatuses can be roughly classified into an active image pickup apparatus and a passive image pickup apparatus. The passive image acquisition device is used for externally controlling data reading of the pixel array, namely, the data reading and outputting are triggered by a host.
Since the reading speed of data depends on the transmission environment of the external host, a buffer First-in First-out (FIFO) queue is usually arranged inside the passive image acquisition device. After the data sampling processing of the pixel array, a buffer FIFO exists, and the host reads data from the buffer FIFO. However, the existing data reading mode has the defect of large data reading delay, so that the control reading and writing time of an external host to the passive image acquisition equipment is long.
On the other hand, due to practical application requirements, the external host often needs to obtain multiple frames of image data under the same or different configurations. However, the conventional data reading method cannot quickly respond to the switching between different configurations, which also causes a large data reading delay.
Disclosure of Invention
The technical problem solved by the invention is how to reduce data reading delay.
In order to solve the above technical problem, an embodiment of the present invention provides a data reading method for a passive image capturing device, including: responding to the completion of the data sampling operation of the previous frame of image, and continuing to perform the data sampling operation of the next frame of image on the pixel array of the passive image acquisition equipment; detecting the data caching state of a caching unit; and discarding or outputting the data of the next frame of image to the buffer unit according to the data buffer state, wherein the discarded data of the next frame of image is an analog signal or a digital signal.
Optionally, the data sampling interval between two adjacent frames of images does not depend on the data buffering state of the buffering unit, where the data buffering state is used to represent whether the free capacity of the buffering unit is sufficient to complete transmission of data of the next frame of image.
Optionally, the discarding or outputting the data of the next frame image to the buffer unit according to the data buffer status includes: if the data cache state is still insufficient in spare capacity when the data sampling of the next frame image starts, discarding the data of the next frame image; and if the data caching state is that the spare capacity is enough when the data sampling of the next frame image is started, outputting the data of the next frame image to the caching unit.
Optionally, after continuing to perform the data sampling operation on the pixel array of the passive image capturing device for the next frame of image, the data reading method further includes: and processing the sampled data of the next frame of image.
Optionally, image configurations of two adjacent frames of images are the same or different, where the image configurations at least include exposure, gain, and size.
In order to solve the above technical problem, an embodiment of the present invention further provides a passive image capturing device, including: an array of pixels; the sampling unit is used for sampling data of the pixel array; a buffer unit for buffering data sampled from the pixel array; and the control unit is communicated with the sampling unit and the buffer unit and executes the method so as to control the discarding or outputting of the data of the next frame image to the buffer unit.
Optionally, the cache unit includes: and the storage controller is used for recording the data caching state of the caching unit, and the control unit detects the storage controller to acquire the data caching state.
Optionally, the passive image capturing apparatus further includes: a processing unit in communication with the control unit, the control unit controlling the processing unit to process data sampled from the pixel array.
To solve the above technical problem, an embodiment of the present invention further provides a storage medium, on which a computer program is stored, and the computer program executes the steps of the above method when being executed by a processor.
In order to solve the above technical problem, an embodiment of the present invention further provides a terminal, including a memory and a processor, where the memory stores a computer program capable of running on the processor, and the processor executes the steps of the method when running the computer program.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides a data reading method of passive image acquisition equipment, which comprises the following steps: responding to the completion of the data sampling operation of the previous frame of image, and continuing to perform the data sampling operation of the next frame of image on the pixel array of the passive image acquisition equipment; detecting the data caching state of a caching unit; and discarding or outputting the data of the next frame of image to the buffer unit according to the data buffer state, wherein the discarded data of the next frame of image is an analog signal or a digital signal.
Compared with the prior technical scheme that the data cached in the cache unit is read by the host and then the data sampling operation of the next frame of image is started, the scheme of the embodiment can greatly reduce the data reading delay, reduce the control reading and writing time of the external passive image acquisition equipment and shorten the time for acquiring multiple frames of images. Specifically, after the data sampling operation of the previous frame image is completed, the data sampling operation of the next frame image is started immediately no matter whether the data in the buffer unit is read or not. Further, the data of the next frame image is discarded or output according to the data buffering state of the buffering unit. Based on the embodiment, since the data sampling operation of the pixel array is independent of the data buffering state of the buffering unit, the buffering unit can receive the data of the pixel array at any time, so that the time interval of the time period during which the data from the buffering unit is read into the data stored in the next frame of image in the prior art is greatly shortened. Thereby, the data reading delay of reading data from the buffer unit is greatly reduced.
Further, the data sampling interval of two adjacent frames of images does not depend on the data buffering state of the buffering unit, wherein the data buffering state is used for representing whether the free capacity of the buffering unit is enough to complete the transmission of the data of the next frame of image. In the interior, similar to the operation logic of the active image capturing device, the passive image capturing device actively performs the data sampling operation without using the data buffering state of the buffer unit as the triggering condition of the data sampling operation. And externally, the data stored in the cache unit is read based on the storage and reading instruction according to the operation logic of the passive image acquisition equipment.
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Fig. 1 is a flowchart of a data reading method of a passive image capturing device according to an embodiment of the present invention;
FIG. 2 is a timing diagram of an exemplary application scenario in accordance with an embodiment of the present invention;
fig. 3 is a schematic diagram of a passive image capturing device according to an embodiment of the present invention.
Detailed Description
As mentioned in the background, the data reading method of the conventional passive image capturing device has a drawback of large data reading delay.
The inventor of the present application has found, through analysis, that the main reason for causing the above-mentioned defects is that according to the data reading process of the conventional passive image capturing device, the data of the pixel array is buffered in the buffer FIFO after being sampled, and when the data buffered in the buffer FIFO is read by the external host, the pixel array data sampling of the next frame of image is started.
In other words, according to the prior art, after sampling a frame of data and storing the frame of data in the buffer unit each time, the sampling of the pixel array is started next time after the data in the buffer unit is read by the external host, and then the next frame of data obtained by sampling is stored in the buffer unit finally. During this period there is clearly a relatively long invalidation delay and the resulting main body of the image needs to be kept for a long time.
In order to solve the above technical problem, an embodiment of the present invention provides a data reading method for a passive image capturing device, including: responding to the completion of the data sampling operation of the previous frame of image, and continuing to perform the data sampling operation of the next frame of image on the pixel array of the passive image acquisition equipment; detecting the data caching state of a caching unit; and discarding or outputting the data of the next frame of image to the buffer unit according to the data buffer state, wherein the discarded data of the next frame of image is an analog signal or a digital signal.
According to the scheme, the data reading delay can be greatly reduced, the control reading and writing time of the external passive image acquisition equipment is shortened, and the time for acquiring multi-frame images is shortened. Specifically, after the data sampling operation of the previous frame image is completed, the data sampling operation of the next frame image is started immediately no matter whether the data in the buffer unit is read or not. Further, the data of the next frame image is discarded or output according to the data buffering state of the buffering unit. Based on the embodiment, since the data sampling operation of the pixel array is independent of the data buffering state of the buffering unit, the buffering unit can receive the data of the pixel array at any time, so that the time interval of the time period during which the data from the buffering unit is read into the data stored in the next frame of image in the prior art is greatly shortened. Thereby, the data reading delay of reading data from the buffer unit is greatly reduced.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a flowchart of a data reading method of a passive image capturing device according to an embodiment of the present invention.
The passive image capturing device according to this embodiment may be an image capturing device in a passive system. Specifically, the passive system may include a host as a master (master) and the passive image capturing device as a slave (slave). The host and the passive image capturing device are coupled through a Serial Peripheral Interface (SPI for short) for communication.
Further, the host may send a storage and reading instruction to trigger the buffer unit of the passive image capturing device to output the buffered data. The output data can be transmitted to the host through the SPI. Further, the passive Image capturing device may be a Complementary Metal Oxide Semiconductor (CMOS) Image Sensor (CIS). For example, a Front-side Illumination (FSI) CMOS image sensor or a Back-side Illumination (BSI) CMOS image sensor (which may also be referred to as a backside CMOS image sensor).
In one implementation, referring to fig. 1, the data reading method of the passive image capturing device according to this embodiment may include the following steps:
step S101, responding to the completion of the data sampling operation of the previous frame of image, and continuing to perform the data sampling operation of the next frame of image on the pixel array of the passive image acquisition equipment;
step S102, detecting the data caching state of a caching unit;
step S103, discarding or outputting the data of the next frame image to the buffer unit according to the data buffer state, where the discarded data of the next frame image is an analog signal or a digital signal.
Specifically, the data sampling operation may include acquiring, row by row, the electrical signal stored so far since the data sampling operation of the previous frame image was performed.
Further, the data sampling operation may include an exposure operation to obtain an analog signal, and a process of converting the analog signal into a digital signal through an analog-to-digital conversion operation.
In one implementation, the digital signal discarded in step S103 may be a digital signal obtained by an analog-to-digital conversion operation. Correspondingly, when the data buffering state of the buffering unit is that the spare capacity is insufficient, the next frame image after analog-to-digital conversion is discarded. That is, discarded is the data of the next frame image represented by the digital signal.
In a variation, when the free capacity of the buffer unit is insufficient, the analog-to-digital conversion process in the data sampling operation may be further omitted in step S101 to save power consumption. At this time, the next frame image without analog-to-digital conversion is discarded in step S103. That is, the analog signal resulting from the exposure operation is discarded.
Specifically, in the present modification, the sampling unit may enter a low power consumption mode to reduce power consumption. For example, an Analog-to-Digital Converter (ADC) and related circuitry may not operate.
Further, the buffer unit (buffer) may be a FIFO.
In one implementation, the buffer unit may include a memory controller (e.g., a FIFO controller) for recording a data buffer status of the buffer unit.
Accordingly, in the step S102, the data buffering status of the buffering unit is obtained by detecting the memory controller.
In one implementation, whether the free capacity of the buffer unit is sufficient to complete the transmission of the data of the next frame image may be determined according to the data buffering state of the buffer unit.
Accordingly, the step S103 may include the steps of: and if the data cache state is still insufficient in free capacity when the data sampling of the next frame image is started, discarding the data of the next frame image.
For example, discarding the data of the next frame image may include deleting the data of the next frame image.
Accordingly, the step S103 may include the steps of: and if the data caching state is that the spare capacity is enough when the data sampling of the next frame image is started, outputting the data of the next frame image to the caching unit.
For example, referring to fig. 2, a first row "internal frame structure" is a frame timing sequence inside the passive image capturing device, and each frame is a frame image obtained by sampling data of the pixel array; wherein the second row "external SPI frame out" is the frame timing at which the host reads the buffer unit. Each frame is a frame image actually output by the buffer unit.
With reference to fig. 2, assuming that the data buffering status of the buffer unit is sufficient when the data sampling operation for the first frame image (denoted by "1" in the figure) of the pixel array starts inside the passive image capturing device, the first frame image is output to the buffer unit and is finally read by the host.
During this period, the passive image capture device continues to perform data sampling operation on the second frame image of the pixel array internally, and obtains data of the second frame image (indicated by "2" in the figure). When the data sampling operation of the second frame image starts, the first frame image still exists in the buffer unit and is not completely read by the host, so that the data buffer state of the buffer unit is insufficient, and the second frame image is discarded (the dotted line in the figure indicates that the second frame image is discarded).
And continuously carrying out data sampling operation on the third frame image of the pixel array inside the passive image acquisition equipment to obtain data of the third frame image (marked by '3' in the figure). And outputting the third frame image to the buffer unit and finally reading the third frame image by the host machine because the data buffer state of the buffer unit is enough for spare capacity when the data sampling operation of the third frame image is started.
During the period, the passive image acquisition device internally continues to perform data sampling operation on the fourth frame image of the pixel array, so as to obtain data of the fourth frame image (indicated by "4" in the figure). When the data sampling operation of the fourth frame image starts, the third frame image still exists in the buffer unit and is not completely read by the host, so that the data buffer state of the buffer unit is insufficient, and the fourth frame image is discarded (the dotted line in the figure indicates that the fourth frame image is discarded).
Thus, as shown in fig. 2, the passive image capturing device internally generates four frames of images, and actually stores two frames of images in the buffer unit. Also, the interval between adjacent frame images of the external SPI output can be greatly reduced.
Further, the data sampling interval between adjacent frame images of the internal frame structure is not the same as the data reading interval between adjacent frame images output by the external SPI frame.
Further, the data sampling interval between adjacent frame images of the internal frame structure is independent of the data buffering state of the buffer unit. That is, even if the data buffer state of the buffer unit is insufficient in capacity, the passive image capturing device continues the data sampling operation for the next frame image.
For another example, when the capacity of the buffer unit is large, such as multiple frames of images can be stored, the first frame image, the second frame image, and the fourth frame image, which may be internal frame structures, are output by the external SPI shown in fig. 2, and the third frame image is discarded.
Therefore, after the data sampling operation of the previous frame image is completed, the data sampling operation of the next frame image is started immediately no matter whether the data in the buffer unit is read or not. Further, the data of the next frame image is discarded or output according to the data buffering state of the buffering unit.
Based on the embodiment, since the data sampling operation of the pixel array is independent of the data buffering state of the buffering unit, the buffering unit can receive the data of the pixel array at any time, so that the time interval of the time period during which the data from the buffering unit is read into the data stored in the next frame of image in the prior art is greatly shortened. Thereby, the data reading delay of reading data from the buffer unit is greatly reduced.
In one implementation, the data sampling interval of two adjacent frames of images is independent of the data buffering state of the buffering unit, wherein the data buffering state represents whether the free capacity of the buffering unit is sufficient to complete the data transmission of the next frame of image.
In the interior, similar to the operation logic of the active image capturing device, the passive image capturing device actively performs the data sampling operation without using the data buffering state of the buffer unit as the triggering condition of the data sampling operation. And externally, the data stored in the cache unit is read based on the storage and reading instruction according to the operation logic of the passive image acquisition equipment.
In a specific implementation, after the step S101, the data reading method according to this embodiment may further include the steps of: and processing the sampled data of the next frame of image.
Specifically, processing the data of the next frame image may include performing digital signal processing operations such as black level calibration, digital noise filtering, data packing, and the like on the data of the next frame image.
Further, the discarding operation in step S103 may be performed in a digital signal processing stage. That is, after the data of the next frame image is obtained, if it is determined that the data of the next frame image needs to be discarded during or after the processing of the data of the next frame image is completed, the processed data of the next frame image is discarded.
In one implementation, the image configuration of two adjacent frames of images may be the same, wherein the image configuration may include at least exposure, gain, and size.
In a variation, the image configurations of two adjacent frames of images may not be the same. Compared with the prior art that an empty frame must be output between frame images of different image configurations before and after switching the image configuration, the change example can realize the immediate response of image configuration switching.
By adopting the scheme of the embodiment, the data reading delay can be greatly reduced, the control reading and writing time of the external passive image acquisition equipment is reduced, and the time for acquiring multi-frame images is shortened.
Fig. 3 is a schematic diagram of a passive image capturing device according to an embodiment of the present invention.
Specifically, referring to fig. 3, the passive image capturing device 5 of the present embodiment may include: a pixel array 51. The pixel array 51 may include a plurality of pixel rows and a plurality of pixel columns (not shown) arranged in an array. The pixel array 51 may include a plurality of pixel regions, and for each pixel region, the at least one photodiode included in the pixel region forms a photosensitive region of the pixel region. The photosensitive regions in the pixel array 51 are sensitized and generate charges, which are read to obtain data for a frame image.
In one implementation, the passive image capturing device 5 may include: a sampling unit 52, configured to perform a sampling operation on the data of the pixel array 51.
In one implementation, the passive image capturing device 5 may include: a buffer unit 54 for buffering the data sampled from the pixel array 51.
For example, the data sampled from the pixel array 51 is processed by the processing unit 53 and then stored in the buffer unit 54.
In one implementation, the passive image capturing device 5 may include: a control unit 55, wherein the control unit 55 is in communication with the sampling unit 52 and the buffer unit 54, and the control unit 55 executes the method shown in fig. 1 to 2 to control to discard or output the data of the next frame image to the buffer unit 54.
In one implementation, the cache unit 54 may include: a memory controller (not shown) for recording the data buffering status of the buffering unit 54, and the control unit 55 detects the memory controller to obtain the data buffering status.
In one implementation, the passive image capturing device 5 may include: a processing unit 53, the control unit 55 being in communication with the processing unit 53, the control unit 55 being capable of controlling the processing unit 53 to process data sampled from the pixel array 51.
For example, after controlling the processing unit 53 to process the data sampled from the pixel array 51, the control unit 55 detects the data buffer status of the buffer unit 54 through the memory controller, and determines to discard or output the processed data of the next frame image to the buffer unit 54.
Further, the embodiment of the present invention also discloses a storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the method technical solution described in the above embodiments shown in fig. 1 and fig. 2 is executed. Preferably, the storage medium may include a computer-readable storage medium such as a non-volatile (non-volatile) memory or a non-transitory (non-transient) memory. The storage medium may include ROM, RAM, magnetic or optical disks, etc.
Further, the embodiment of the present invention further discloses a terminal, which includes a memory and a processor, where the memory stores a computer program capable of running on the processor, and the processor executes the technical solution of the method in the embodiment shown in fig. 1 and fig. 2 when running the computer program.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A data reading method of a passive image acquisition device is characterized by comprising the following steps:
responding to the completion of the data sampling operation of the previous frame of image, and continuing to perform the data sampling operation of the next frame of image on the pixel array of the passive image acquisition equipment;
detecting the data caching state of a caching unit;
and discarding or outputting the data of the next frame of image to the buffer unit according to the data buffer state, wherein the discarded data of the next frame of image is an analog signal or a digital signal.
2. The data reading method according to claim 1, wherein a data sampling interval between two adjacent frames of images is independent of a data buffering state of the buffer unit, wherein the data buffering state is used for representing whether a free capacity of the buffer unit is sufficient to complete transmission of data of a next frame of image.
3. The data reading method according to claim 2, wherein the discarding or outputting the data of the next frame image to the buffer unit according to the data buffer status comprises:
if the data cache state is still insufficient in spare capacity when the data sampling of the next frame image starts, discarding the data of the next frame image;
and if the data caching state is that the spare capacity is enough when the data sampling of the next frame image is started, outputting the data of the next frame image to the caching unit.
4. The data reading method according to claim 1, wherein after the continuing of the data sampling operation for the next frame of image on the pixel array of the passive image capturing device, the method further comprises:
and processing the sampled data of the next frame of image.
5. A method for reading data according to claim 1, wherein image configurations of two adjacent frames of images are the same or different, wherein the image configurations include at least exposure, gain and size.
6. A passive image capture device, comprising:
an array of pixels;
the sampling unit is used for sampling data of the pixel array;
a buffer unit for buffering data sampled from the pixel array;
a control unit, which is in communication with the sampling unit and the buffer unit, and executes the method of any one of the above claims 1 to 5 to control discarding or outputting data of the next frame image to the buffer unit.
7. The passive image capturing apparatus according to claim 6, wherein the buffer unit includes:
and the storage controller is used for recording the data caching state of the caching unit, and the control unit detects the storage controller to acquire the data caching state.
8. The passive image capturing apparatus according to claim 6, further comprising:
a processing unit in communication with the control unit, the control unit controlling the processing unit to process data sampled from the pixel array.
9. A storage medium having a computer program stored thereon, the computer program, when being executed by a processor, performing the steps of the method according to any of the claims 1 to 5.
10. A terminal comprising a memory and a processor, the memory having stored thereon a computer program operable on the processor, wherein the processor, when executing the computer program, performs the steps of the method of any of claims 1 to 5.
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| CN111277836A (en) * | 2020-01-19 | 2020-06-12 | 苏州浪潮智能科技有限公司 | Video extraction frame loss control method, system, terminal and storage medium |
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