CN106375689B - The flexible sampled images sensor of high speed and its sampling control method - Google Patents
The flexible sampled images sensor of high speed and its sampling control method Download PDFInfo
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- CN106375689B CN106375689B CN201610828605.9A CN201610828605A CN106375689B CN 106375689 B CN106375689 B CN 106375689B CN 201610828605 A CN201610828605 A CN 201610828605A CN 106375689 B CN106375689 B CN 106375689B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/70—SSIS architectures; Circuits associated therewith
- H04N25/76—Addressed sensors, e.g. MOS or CMOS sensors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/40—Extracting pixel data from image sensors by controlling scanning circuits, e.g. by modifying the number of pixels sampled or to be sampled
- H04N25/44—Extracting pixel data from image sensors by controlling scanning circuits, e.g. by modifying the number of pixels sampled or to be sampled by partially reading an SSIS array
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/50—Control of the SSIS exposure
Abstract
The present invention relates to a kind of flexible sampled images sensor of high speed, the image feedback unit of the sensor receives the image data of reading circuit output and positions the row or column pixel for needing time sampling or windowing, and selection data command is passed to codimg logic unit；Codimg logic unit is encoded according to selection instruction；Row selects decoder, column selection decoder to decode respectively to the row encoded signal and column encoded signal of the output of codimg logic unit, under windowing mode or secondary sampling configuration, row selects decoder according to decoding result control drive control circuit, selection corresponding line pixel is scanned, while column selection decoder control reading circuit selection respective column pixel data is read out.Valid data reading speed of the present invention is high, handling strong, opens a window high-efficient, while not increasing sensor bulk additionally.
Description
Technical field
The invention belongs to image sensor technologies fields, and in particular to a kind of height that can choose the work of specific pixel region
Fast flexibly sampled images sensor and its sampling control method.
Background technique
Cmos image sensor is that one kind is widely used in machine vision, target reconnaissance, safety monitoring and medical treatment detection
Photoelectronic imaging device, since at low cost, the high advantage of integrated level, image sensor chip can integrate more polyphaser system
Function of uniting realizes camera volume microminiaturization and functional diversities to reduce the peripheral circuit of camera.
In industrial detection, in order to realize that fast imaging and highest priority monitoring, camera first carry out time sampling configuration, principle
As shown in Figure 1, entering windowing scan pattern after sensor finds target, only special area all pixels are scanned, principle
As shown in Figure 2.Secondary sampling configuration is imaging sensor according to preset program, is only swept to row, column pixel fixed in pixel
It retouches, captures the rough and careless information image of object view；Windowing scan pattern is after finding observed object, and imaging sensor is only in windowed regions
All pixels be scanned, capture the accurate image in object view part.Since under both scan patterns, sensor is only to part
Pixel carries out Signal sampling and processing, therefore the driving and reading of reasonable distribution pixel, can effectively improve imaging sensor
Frame per second.
To realize above-mentioned function, functional module all generally is added in camera peripheral circuit, from the additional function reality of system
Existing windowing function, turn on window includes opening a window to the continuous row pixel of sensor, such as only to imaging sensor top half pixel
Data are read out, and realization sensor half opens a window, these control methods have handling to sensor pixel not strong, windowing efficiency
The disadvantages of poor, while additional peripheral circuit makes camera volume increase and be unfavorable for carrying.
Summary of the invention
It is handling strong that the technical problem to be solved in the present invention is to provide one kind, opens a window high-efficient, while not increasing additionally and passing
The flexible sampled images sensor of the high speed of sensor volume.
In order to solve the above-mentioned technical problem, the flexible sampled images sensor of high speed of the invention includes being integrated in image sensing
Pixel array, drive control circuit on device chip, reading circuit；Characterized by further comprising be integrated in image sensor chip
On row select decoder, column selection decoder, image feedback unit and codimg logic unit；Wherein image feedback unit and coding are patrolled
It collects unit to be made of programmable logic circuit, the image data that image feedback unit receives reading circuit output simultaneously positions needs
Selection data command, is passed to codimg logic unit by the row or column pixel of sampling or windowing；Codimg logic unit is according to choosing
Instruction is selected to be encoded；Row selects decoder, column selection decoder to compile respectively to the row encoded signal and column of the output of codimg logic unit
Code signal is decoded, and under windowing mode or secondary sampling configuration, row selects decoder according to decoding result control drive control
Circuit selects corresponding line pixel to be scanned, while column selection decoder control reading circuit selection respective column pixel data carries out
Read
The invention solves another technical problem be to provide a kind of adopting for flexible sampled images sensor of above-mentioned high speed
Sample control method.
In order to solve the above-mentioned technical problem, the sampling control method of the flexible sampled images sensor of high speed of the invention includes
Following step:
Step 1: image feedback unit receives the image data of reading circuit output and is handled, according to processing result
The row, column pixel of time sampling area is positioned, and selection data command is passed to codimg logic unit；Codimg logic unit according to
Selection instruction is encoded, and the row encoded signal and column encoded signal under time sampling configuration are obtained；
Step 2: row selects decoder to decode the row encoded signal that codimg logic unit exports, time sampling mould is obtained
Each frame pixel line number to be scanned under formula；Column selection decoder decodes the column encoded signal that codimg logic unit exports,
Obtain each frame pixel row number to be read under time sampling configuration；
Step 3: row selects decoder according to each frame that step 2 the decodes pixel line number to be scanned control driving control
Row choosing switch in circuit processed, is only exposed the pixel of corresponding line in each frame；It is decoded simultaneously according to step 2 each
The pixel row number control reading circuit column selection switch that frame to be read, is only read out the pixel data of respective column in each frame；
Step 4: image feedback unit receives the image data that reading circuit exports under time sampling configuration and is handled,
Codimg logic unit is passed to according to processing result positioning fenestration region, and selection data command；Codimg logic unit according to
Selection instruction is encoded, and the row encoded signal and column encoded signal under windowing mode are obtained；
Step 5: row selects the row of decoder, column selection decoder respectively to the windowed regions pixel of codimg logic unit output
Encoded signal and column encoded signal are decoded, and control drive control circuit according to decoding result, to all rows of windowed regions
Pixel is scanned, while all column pixels for controlling reading circuit selection windowed regions carry out reading data.
In the step 3, only secondary sampling area odd-line pixels are exposed in first frame, it is odd to secondary sampling area
Ordered series of numbers pixel data is read out；Only secondary sampling area even rows are exposed in the second frame, it is even to secondary sampling area
Ordered series of numbers pixel data is read out.
In the step 3, only secondary sampling area even rows can also be exposed in first frame, to secondary sampling
Region even column pixels data are read out；Only secondary sampling area odd-line pixels are exposed in the second frame, to secondary sampling
Region odd column pixel data are read out.
In the step 3, only secondary sampling area odd-line pixels can also be exposed in first frame, to secondary sampling
Region even column pixels data are read out；Only secondary sampling area even rows are exposed in the second frame, to secondary sampling
Region odd column pixel data are read out.
In the step 3, only secondary sampling area 3n+1 row pixel can also be exposed in first frame, be adopted to secondary
Sample region 3n+1 column pixel data is read out；Only secondary sampling area 3n+2 row pixel is exposed in the second frame, it is right
Secondary sampling area 3n+2 column pixel data is read out；Only secondary sampling area 3n+3 row pixel is exposed in third frame
Light is read out secondary sampling area 3n+3 column pixel data, wherein n=0,1,2 ....
In the step 4, windowed regions are one or more rectangles comprising target area.
The high feature of present invention combination cmos image sensor integrated level integrates secondary scanning function and windowing function simultaneously
Onto cmos image sensor chip, by secondary sampling configuration can the row, column that scanned with flexible choice, to obtain object institute
The coarse data information of imaging；It was found that reading the data letter of all row and columns of windowed regions under the scan pattern that opens a window after target
Breath, to obtain the precise information information of object imaging, so that camera be made to have both high speed, flexibly scanning function and volume are miniature
Change two kinds of characteristics.The present invention can be realized the high frame per second of imaging sensor Image Acquisition and the accurate scan to area-of-interest,
Valid data reading speed is high, handling strong, opens a window high-efficient, while not increasing sensor bulk additionally.
Detailed description of the invention
Invention is further described in detail with reference to the accompanying drawings and detailed description.
Fig. 1 is the prior art quickly secondary sampling configuration schematic diagram.
Fig. 2 is the prior art locally windowing pattern diagram.
Fig. 3 is the flexible sampled images sensor structure schematic diagram of high speed of the invention.Fig. 4 is that high speed of the invention is flexibly adopted
Sampled images sensor local circuit structural schematic diagram.
Fig. 5 a is normal row selects signal schematic diagram, and Fig. 5 b is row choosing of the embodiment of the present invention 1 after row selects decoder to intervene
Signal schematic representation.
Fig. 6 is the odd even ranks exchange sampling schematic diagram of the embodiment of the present invention 1.
Fig. 7 is 1 schematic diagram of windowing method.
Fig. 8 a, Fig. 8 b, Fig. 8 c are 2 schematic diagrames of windowing method.
Fig. 9 is 3 schematic diagram of windowing method.
Specific embodiment
As shown in Figure 2,3, pixel array, clock circuit PLL are generally integrated on image sensor chip, timing generates electricity
Road, drive control circuit, serial peripheral equipment interface SPI, reading circuit etc..The flexible sampled images sensor of high speed of the invention will go
Decoder, column selection decoder, codimg logic unit and image feedback unit is selected to be integrated on image sensor chip；Image feedback
The input of unit is connect by data channel with reading circuit, and output is connect with the input of codimg logic unit, codimg logic list
The output of member selects decoder and the input of column selection decoder to connect with row；Row select the output of decoder and column selection decoder respectively with
Drive control circuit is connected with reading circuit.
Embodiment 1
The sampling control method of the flexible sampled images sensor of high speed of the invention is specific as follows:
As shown in Fig. 5 b, Fig. 6, under secondary sampling configuration, image feedback unit receives the image data of reading circuit output
And handled, the row or column pixel of time sampling area is positioned according to processing result, and selection data command is passed to coding
Logic unit；Codimg logic unit is encoded according to selection instruction, and the row encoded signal and column obtained under time sampling configuration is compiled
Code signal.
Row selects decoder to decode the row encoded signal that codimg logic unit exports, according to decoding result control driving
Row choosing switch in control circuit is only connected time sampling area odd number every trade choosing switch in first frame, is carried out to odd-line pixels
Exposure；Column selection decoder decodes the column encoded signal that codimg logic unit exports simultaneously, is only connected according to decoding result
The odd column column selection switch of time sampling area, reads odd-numbered line even column pixels data in reading circuit.Due to using odd number/idol
Several this modes of pixel sampling, every frame need to only acquire time a quarter of sampling area original pixel, therefore imaging sensor
Frame per second can be improved four times.In order to guarantee that valid data are not missed, even number line even column pixels number is only read in the second frame
According to.By the processing of front and back two field pictures, determine to area-of-interest in pixel array (windowed regions).
In the present embodiment, time sampling area even number line odd column pixel data can also be read in first frame, in the second frame
It reads time sampling area odd-numbered line even column pixels data or first frame reads time sampling area odd-numbered line even column pixels number
According in the second frame reading time sampling area even number line odd column pixel data or first frame reading time sampling area even number line
Even column pixels data read time sampling area odd-numbered line odd column pixel data in the second frame.
Secondary sampling area can be entire picture element matrix, be also possible to partial pixel matrix.
Embodiment 2
The sampling control method of the flexible sampled images sensor of high speed of the invention is specific as follows:
As shown in Fig. 5 b, Fig. 6, under secondary sampling configuration, image feedback unit receives the image data of reading circuit output
And handled, the row or column pixel of time sampling area is positioned according to processing result, and selection data command is passed to coding
Logic unit；Codimg logic unit is encoded according to selection instruction, and the row encoded signal and column obtained under time sampling configuration is compiled
Code signal.
Row selects decoder to decode the row encoded signal that codimg logic unit exports, according to decoding result control driving
Row choosing switch in control circuit, only connects the choosing of time sampling area 3n+1 every trade in first frame and switchs, to secondary sampling area the
3n+1 row pixel is exposed；Column selection decoder decodes the column encoded signal that codimg logic unit exports simultaneously, according to
Decoding result only connects the 3n+1 column column selection switch of time sampling area in reading circuit, reads time sampling area 3n+1 column picture
Prime number evidence is only exposed secondary sampling area 3n+2 row pixel in the second frame, to secondary sampling area 3n+2 column pixel number
According to being read out；Only secondary sampling area 3n+3 row pixel is exposed in third frame, to secondary sampling area 3n+3 column picture
Prime number evidence is read out, wherein n=0,1,2 ....Since in this way, every frame need to only acquire time original picture of sampling area
/ 9th of element, therefore the frame per second of imaging sensor can be improved nine times.By the processing of three frame image of front and back, determine to picture
Area-of-interest (windowed regions) in pixel array.
The method for determining windowed regions is specific as follows.
Windowing method 1: as shown in fig. 7, according to the image data that secondary sampling configuration acquires, image feedback unit, which is chosen, includes
The square region of target is as windowed regions
Windowing method 2: as shown in Fig. 8 a, 8b, 8c, multiple windows are opened to multiple objects.According to the acquisition of secondary sampling configuration
Image data, image feedback unit choose the square region comprising target as windowed regions.
The row or column pixel as shared by multiple targets exists discontinuously, and sensor can be in do not go together pixel or column picture
Multiple target objects of element open multiple corresponding windows.
Windowing method 3: as shown in figure 9, multiple overlapping objects open maximized window: the picture number acquired according to secondary sampling configuration
According to image feedback unit chooses the rectangular area comprising multiple targets as windowed regions.
Claims (7)
1. a kind of flexible sampled images sensor of high speed includes the pixel array being integrated on image sensor chip, drive control
Circuit, reading circuit；Characterized by further comprising the row being integrated on image sensor chip select decoder, column selection decoder,
Image feedback unit and codimg logic unit；Wherein image feedback unit and codimg logic unit are by programmable logic circuit group
At image feedback unit receives the image data of reading circuit output and positions the row or column picture for needing time sampling or windowing
Selection data command is passed to codimg logic unit by element；Codimg logic unit is encoded according to selection instruction；Row translates code selectively
Device, column selection decoder respectively decode the row encoded signal and column encoded signal of the output of codimg logic unit, in windowing mould
Under formula or secondary sampling configuration, row selects decoder according to decoding result control drive control circuit, and corresponding line pixel is selected to carry out
Scanning, while column selection decoder control reading circuit selection respective column pixel data is read out.
2. a kind of sampling control method of the flexible sampled images sensor of high speed as described in claim 1, it is characterised in that packet
Include following step:
Step 1: image feedback unit receives the image data of reading circuit output and handled, positioned according to processing result
The row, column pixel of secondary sampling area, and selection data command is passed to codimg logic unit；Codimg logic unit is according to selection
Instruction is encoded, and the row encoded signal and column encoded signal under time sampling configuration are obtained；
Step 2: row selects decoder to decode the row encoded signal that codimg logic unit exports, obtain under time sampling configuration
Each frame pixel line number to be scanned；Column selection decoder decodes the column encoded signal that codimg logic unit exports, and obtains
Each frame pixel row number to be read under secondary sampling configuration；
Step 3: row selects decoder according to each frame that step 2 the decodes pixel line number to be scanned control drive control electricity
Row choosing switch in road, is only exposed the pixel of corresponding line in each frame；Column selection decoder is decoded according to step 2 simultaneously
To each frame pixel row number to be read control reading circuit column selection switch, only the pixel data of respective column is carried out in each frame
It reads；
Step 4: image feedback unit receives the image data that reading circuit exports under time sampling configuration and is handled, according to
Processing result positioning fenestration region, and selection data command is passed to codimg logic unit；Codimg logic unit is according to selection
Instruction is encoded, and the row encoded signal and column encoded signal under windowing mode are obtained；
Step 5: row selects decoder, column selection decoder to encode respectively to the row of the windowed regions pixel of codimg logic unit output
Signal and column encoded signal are decoded, and control drive control circuit according to decoding result, to all row pixels of windowed regions
It is scanned, while all column pixels for controlling reading circuit selection windowed regions carry out reading data.
3. the sampling control method of the flexible sampled images sensor of high speed according to claim 2, it is characterised in that described
In step 3, only secondary sampling area odd-line pixels are exposed in first frame, to secondary sampling area odd column pixel data
It is read out；Only secondary sampling area even rows are exposed in the second frame, to secondary sampling area even column pixels data
It is read out.
4. the sampling control method of the flexible sampled images sensor of high speed according to claim 2, it is characterised in that described
In step 3, only secondary sampling area even rows are exposed in first frame, to secondary sampling area even column pixels data
It is read out；Only secondary sampling area odd-line pixels are exposed in the second frame, to secondary sampling area odd column pixel data
It is read out.
5. the sampling control method of the flexible sampled images sensor of high speed according to claim 2, it is characterised in that described
In step 3, only secondary sampling area odd-line pixels are exposed in first frame, to secondary sampling area even column pixels data
It is read out；Only secondary sampling area even rows are exposed in the second frame, to secondary sampling area odd column pixel data
It is read out.
6. the sampling control method of the flexible sampled images sensor of high speed according to claim 2, it is characterised in that described
In step 3, only secondary sampling area 3n+1 row pixel is exposed in first frame, to secondary sampling area 3n+1 column pixel
Data are read out；Only secondary sampling area 3n+2 row pixel is exposed in the second frame, secondary sampling area 3n+2 is arranged
Pixel data is read out；Only secondary sampling area 3n+3 row pixel is exposed in third frame, to secondary sampling area 3n+
3 column pixel datas are read out, wherein n=0,1,2 ....
7. the sampling control method of the flexible sampled images sensor of high speed according to claim 2, it is characterised in that described
In step 4, windowed regions are one or more rectangles comprising target area.
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| CN110012246B (en) * | 2019-03-26 | 2020-06-02 | 电子科技大学 | Method for realizing high-speed window function of focal plane array reading circuit |
| CN111294530B (en) * | 2020-02-18 | 2022-02-11 | 西安微电子技术研究所 | Free sub-sampling type row logic circuit for image sensor and working method thereof |
| CN112954241A (en) * | 2021-02-20 | 2021-06-11 | 南京威派视半导体技术有限公司 | Image data reading system of image sensor and reading and organizing method |
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