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Low-frame-frequency imaging system and image output method thereof

An imaging system and frame image technology, applied in image communication, TV system components, TV, etc., can solve the problem that CMOS image detectors are difficult to adapt to low frame frequency imaging requirements, so as to meet image output requirements and ensure image quality Effect

Inactive Publication Date: 2017-04-26
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0003] In order to solve the technical problem that the existing CMOS image detectors are difficult to meet the requirements of low frame rate imaging, the present invention provides a low frame rate imaging system and its image output method

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  • Low-frame-frequency imaging system and image output method thereof

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Embodiment Construction

[0017] The preferred embodiment of the present invention selects the CMOS image detector vita1300 of ONSEMI Company to carry out image acquisition, in order to overcome the contradiction between the higher rate and frame frequency and the camera image output format constraints, the present embodiment uses image detector and image processing A piece of SRAM memory with a capacity of 1M*16bit is added between the chips (the size of a frame image is 1M*10bit).

[0018] see figure 1 , the specific workflow of the low frame rate imaging system in this embodiment is as follows:

[0019] The working frequency of the detector is 25MHz. When the system exposure time is less than 50ms, the frame frequency is 18f / s. When the first frame image is output to the detector, it will be stored in SRAM, and the FPGA will not process the second to ninth frame output, but During this period, the first frame of image is read out from the SRAM; when the 10th frame image is output to the detector, i...

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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 [0001] The invention relates to a low frame frequency imaging system and an image output method thereof. Background technique [0002] As we all know, limited by the transmission channel bandwidth or back-end image processing capabilities, the image frame frequency of aerospace imaging systems is generally low, and the data rate requirements are low. However, the current CMOS image detectors often have a high frame rate. If they are forced to work at a lower frame rate and readout rate, dark current will accumulate, resulting in increased image noise and poorer output image quality. Contents of the invention [0003] In order to solve the technical problem that the existing CMOS image detectors are difficult to meet the requirements of low frame rate imaging, the present invention provides a low frame rate imaging system and an image output method thereof. [0004] The technical solution of the present invention is: a low frame rate imaging system, includi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/243H04N5/235H04N23/76
CPCH04N23/76H04N23/73
Inventor 朱波许哲樊学武任国瑞
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI