CN106603936A - Low-frame-frequency imaging system and image output method thereof - Google Patents
Low-frame-frequency imaging system and image output method thereof Download PDFInfo
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- CN106603936A CN106603936A CN201611248132.1A CN201611248132A CN106603936A CN 106603936 A CN106603936 A CN 106603936A CN 201611248132 A CN201611248132 A CN 201611248132A CN 106603936 A CN106603936 A CN 106603936A
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- 238000003384 imaging method Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000003860 storage Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000014759 maintenance of location Effects 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000000605 extraction Methods 0.000 abstract 1
- 230000009286 beneficial effect Effects 0.000 description 1
Classifications
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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
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/76—Circuitry for compensating brightness variation in the scene by influencing the image signals
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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
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/73—Circuitry for compensating brightness variation in the scene by influencing the exposure time
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- Engineering & Computer Science (AREA)
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- Signal Processing (AREA)
- Studio Devices (AREA)
Abstract
The invention relates to a low-frame-frequency imaging system and an image output method thereof. The imaging system comprises an image detector and an image processing chip and further comprises an image buffer, wherein the image buffer is disposed on an image transmission channel between the image detector and the image processing chip. According to the invention, through arrangement of the image buffer, image information output by the image detector is firstly cached frame by frame and then the image processing chip performs frame-extraction reading, such that the image quality of the image detector when the image detector works at a quite high frequency and a reading rate is guaranteed, and at the same time, the demand for low-frame-frequency image output can also be satisfied.
Description
Technical field
The present invention relates to a kind of low frame rate imaging system and its image output method.
Background technology
It is well known that being limited to transmission channel bandwidth or back-end image disposal ability, space borne imagery system picture frame frequency is general
All over less, data rate request is relatively low.But, current cmos image detector, frame frequency is often higher, if forcing it to work in
Compared with low frame rate and read-out speed, dark current can be caused to accumulate, cause picture noise to increase, output image quality is poor.
The content of the invention
In order to solve the technical problem that existing cmos image detector is difficult in adapt to low frame rate imaging demand, the present invention is carried
For a kind of low frame rate imaging system and its image output method.
The present invention technical solution be：A kind of low frame rate imaging system, including image detector and image procossing core
Piece, it is characterised in that：Also include image buffer；Described image buffer is located between image detector and picture processing chip
Image transmitting passage on.
Above-mentioned image buffer is SRAM memory.
The capacity of above-mentioned SRAM memory is 1M*16bit.
The present invention also provides a kind of image output method of low frame rate imaging system, and it is characterized in that：Including following
Step：
1) after system electrification, image detector starts to expose and gather image；
2) image detector frame by frame exports the image for collecting into image buffer, and image transmitting frame frequency is 2n
fps；Picture processing chip read image information from image buffer by the way of frame using taking out；
2.1) the 1st two field picture is stored in image buffer, and picture processing chip is not processed；
2.2) during the 2nd frame is stored in image buffer to n-th frame image, picture processing chip is from image buffer
The 1st two field picture of middle reading；
2.3) the (n+1)th two field picture is stored in image buffer, and picture processing chip is not processed；
2.4) during the n-th+2 frame is stored in image buffer to 2n two field pictures, picture processing chip is temporary from image
The (n+1)th two field picture is read in storage；
3) picture processing chip carries out the image of reading to export after parallel-serial conversion.
The beneficial effects of the present invention is：The present invention is by setting image buffer, the figure for first exporting image detector
As information is cached frame by frame, then carry out taking out frame by picture processing chip again and read, both ensure that image detector was operated in
Picture quality when upper frequency and read-out speed, while and can meet low frame rate image output demand.
Description of the drawings
Fig. 1 is that low frame rate imaging system image output method of the present invention takes out frame principle schematic.
Specific embodiment
Presently preferred embodiments of the present invention carries out image acquisition from the cmos image detector vita1300 of ONSEMI companies,
In order to overcome the contradiction of higher rate and frame frequency again and between the constraint of camera image output format, the present embodiment is in image detector
(size of 1 two field picture is 1M* to increase the SRAM memory that a piece of capacity is 1M*16bit between picture processing chip
10bit)。
Referring to Fig. 1, the specific workflow of the present embodiment low frame rate imaging system is as follows：
Detector operating frequency 25MHz, when system exposure times are less than 50ms, frame frequency adopts 18f/s, when the 1st frame figure
During as output detector, SRAM is deposited into, FPGA is disregarded when the 2nd～9 frame is exported, but in this period by the first frame
Image reads from SRAM；When the 10th two field picture output detector, SRAM is deposited into, FPGA is refused when the 11st～18 frame is exported
Process, but read the 10th two field picture from SRAM in this period, the speed that image reads from SRAM is 2.5MHz, and go here and there turn
After changing, output speed is 25Mbps, meets application requirement.
When system exposure times be more than 50ms when, frame frequency can be reduced according to time of exposure, but, the thinking of caching process with
Analysis above is consistent.
Claims (5)
1. a kind of low frame rate imaging system, including image detector and picture processing chip, it is characterised in that：Also include that image is temporary
Storage；Described image buffer is located on the image transmitting passage between image detector and picture processing chip.
2. low frame rate imaging system according to claim 1, it is characterised in that：Described image buffer is SRAM storages
Device.
3. low frame rate imaging system according to claim 2, it is characterised in that：The capacity of the SRAM memory is 1M*
16bit。
4. according to arbitrary described low frame rate imaging system in claim 1-3, it is characterised in that：Described image detector is
Cmos image detector vita1300.
5. a kind of image output method of low frame rate imaging system, it is characterised in that：Comprise the following steps：
1) after system electrification, image detector starts to expose and gather image；
2) image detector frame by frame exports the image for collecting into image buffer, and image transmitting frame frequency is 2n fps；Figure
As process chip read image information from image buffer by the way of frame using taking out；
2.1) the 1st two field picture is stored in image buffer, and picture processing chip is not processed；
2.2) during the 2nd frame is stored in image buffer to n-th frame image, picture processing chip is read from image buffer
Take the 1st two field picture；
2.3) the (n+1)th two field picture is stored in image buffer, and picture processing chip is not processed；
2.4) during the n-th+2 frame is stored in image buffer to 2n two field pictures, picture processing chip is from image buffer
The (n+1)th two field picture of middle reading；
3) picture processing chip carries out the image of reading to export after parallel-serial conversion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611248132.1A CN106603936A (en) | 2016-12-29 | 2016-12-29 | Low-frame-frequency imaging system and image output method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611248132.1A CN106603936A (en) | 2016-12-29 | 2016-12-29 | Low-frame-frequency imaging system and image output method thereof |
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| CN106603936A true CN106603936A (en) | 2017-04-26 |
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| CN201611248132.1A Pending CN106603936A (en) | 2016-12-29 | 2016-12-29 | Low-frame-frequency imaging system and image output method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107566704A (en) * | 2017-09-28 | 2018-01-09 | 中国科学院长春光学精密机械与物理研究所 | The high speed imaging of multi output high definition records integrated camera |
| CN109194870A (en) * | 2018-10-17 | 2019-01-11 | 中国科学院西安光学精密机械研究所 | A kind of imaging method and imaging system of navigation application |
| CN117146990A (en) * | 2023-08-30 | 2023-12-01 | 北京波谱华光科技有限公司 | Low-frame-frequency external triggering method and system based on uncooled infrared detector |
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| CN201200411Y (en) * | 2008-06-06 | 2009-03-04 | 华南理工大学 | Real time system for detecting fatigue of driver based on FPGA |
| CN104135659A (en) * | 2014-08-01 | 2014-11-05 | 西安电子科技大学 | Visible light and infrared target scene simulation and loading system, and application method |
| CN205748663U (en) * | 2016-06-14 | 2016-11-30 | 上海集成电路研发中心有限公司 | A kind of Multifunction infrared thermal imagery instrument |
| CN206364912U (en) * | 2016-12-29 | 2017-07-28 | 中国科学院西安光学精密机械研究所 | A kind of low frame rate imaging system |
-
2016
- 2016-12-29 CN CN201611248132.1A patent/CN106603936A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201200411Y (en) * | 2008-06-06 | 2009-03-04 | 华南理工大学 | Real time system for detecting fatigue of driver based on FPGA |
| CN104135659A (en) * | 2014-08-01 | 2014-11-05 | 西安电子科技大学 | Visible light and infrared target scene simulation and loading system, and application method |
| CN205748663U (en) * | 2016-06-14 | 2016-11-30 | 上海集成电路研发中心有限公司 | A kind of Multifunction infrared thermal imagery instrument |
| CN206364912U (en) * | 2016-12-29 | 2017-07-28 | 中国科学院西安光学精密机械研究所 | A kind of low frame rate imaging system |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107566704A (en) * | 2017-09-28 | 2018-01-09 | 中国科学院长春光学精密机械与物理研究所 | The high speed imaging of multi output high definition records integrated camera |
| CN109194870A (en) * | 2018-10-17 | 2019-01-11 | 中国科学院西安光学精密机械研究所 | A kind of imaging method and imaging system of navigation application |
| CN109194870B (en) * | 2018-10-17 | 2020-12-25 | 中国科学院西安光学精密机械研究所 | Imaging method and imaging system for navigation application |
| CN117146990A (en) * | 2023-08-30 | 2023-12-01 | 北京波谱华光科技有限公司 | Low-frame-frequency external triggering method and system based on uncooled infrared detector |
| CN117146990B (en) * | 2023-08-30 | 2024-03-08 | 北京波谱华光科技有限公司 | Low-frame-frequency external triggering method and system based on uncooled infrared detector |
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