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Adjusting method and adjusting system for digital domain TDI (Time, Delay and Integration) camera imaging quality

An adjustment method and camera imaging technology, applied in the parts of TV system, image communication, color TV, etc., can solve the problem of parameter adjustment research and achieve the effect of on-orbit self-adaptive adjustment

Active Publication Date: 2017-05-31
CAPITAL NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on TDI technology in the digital domain is mainly limited to the exploration of imaging principles, and there is basically no follow-up parameter adjustment research.

Method used

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  • Adjusting method and adjusting system for digital domain TDI (Time, Delay and Integration) camera imaging quality
  • Adjusting method and adjusting system for digital domain TDI (Time, Delay and Integration) camera imaging quality
  • Adjusting method and adjusting system for digital domain TDI (Time, Delay and Integration) camera imaging quality

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Embodiment 1: as figure 1 As shown, the adjustment method of digital domain TDI camera image quality comprises the following steps:

[0060] Step 101: Determine the pre-shooting area according to the detection parameters of the sensor of the TDI camera and the satellite operating parameters, specifically including determining the number of pre-shooting areas, the interval of each pre-shooting area and the number of rows in each pre-shooting area;

[0061] Step 102: Determine the actual grayscale mean value of the pre-shooting area according to the pre-shooting exposure time and the pre-shooting gain;

[0062] Step 103: Determine the product of the expected exposure time and the expected gain of the TDI imaging area according to the expected gray value, the actual gray value, the pre-shot exposure time and the pre-shot gain;

[0063] Step 104: According to the digital domain TDI imaging modulation transfer function and the digital domain TDI imaging signal-to-noise rati...

Embodiment 2

[0078] Embodiment 2: as figure 2 As shown, the digital domain TDI camera imaging quality adjustment system includes:

[0079] The pre-shooting determining module 201 is used to determine the pre-shooting area according to the detection parameters of the sensor of the TDI camera and the satellite operation parameters, wherein the detection parameters of the sensor include the detection area of ​​the sensor, the readout time of the sensor, and the satellite operation parameters include satellite orbit, satellite ground speed and orbit altitude;

[0080] An actual grayscale determination module 202, configured to determine the actual grayscale mean value of the pre-shoot area according to the pre-shoot exposure time and the pre-shoot gain;

[0081] The expected product determination module 203 is used to determine the product of the expected exposure time and the expected gain of the TDI imaging area according to the expected gray value, the actual gray value, the pre-shot expo...

Embodiment 3

[0095] Embodiment 3: The method for adjusting the imaging quality of a digital domain TDI camera comprises the following steps:

[0096] Step 301: Using the local windowing capability of the area array CMOS image sensor, segment the pre-shooting area from the actual imaging area, and the shooting parameters of the actual imaging area can be set by analyzing the previous pre-shooting area for feedback. Such as image 3 As shown in , there is a spatial gap between the pre-shooting area and the actual imaging area, forming a pre-shooting mode. image 3 1 is the pre-shooting area, 2 is the interval between each pre-shooting window area, X indicates the size of the pre-shooting area, that is, the number of rows in the pre-shooting area, y indicates the size of the interval between each pre-shooting window area, and the lower part Strip area 3 is the digital domain TDI imaging area. The selection of the number of pre-shooting areas is determined by the detection parameters of the ...

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Abstract

The invention discloses an adjusting method and adjusting system for imaging quality of a digital domain TDI (Time, Delay and Integration) camera. The adjusting method comprises the steps of determining a pre-photographing area; determining an actual gray average value of the pre-photographing area according to pre-photographing exposure time and pre-photographing gain; determining a product of expected exposure time and an expected gain of a TDI imaging area; determining integration series and integration time of the TDI imaging area; determining the expected gain and the expected exposure time; determining an image of the current TDI imaging area according to the integration series, the integration time, the expected gain and the expected exposure time; and judging whether a next pre-photographing area exists or not, if the next pre-photographing area exists, updating the pre-photographing exposure time and the pre-photographing gain, otherwise, determining a photographing image of the TDI camera according to the image of each TDI imaging area. According to the adjusting method and the adjusting system provided by the invention, the in-orbit self-adaptive adjustment for the imaging quality of the digital domain TDI camera can be finished according to an actual photographing environment.

Description

technical field [0001] The invention relates to the field of digital domain TDI imaging, in particular to a method and system for adjusting the imaging quality of a digital domain TDI camera. Background technique [0002] Digital domain TDI technology is a new type of photoelectric imaging technology, which is mainly used in CMOS sensors to solve the limitation of expensive technology of scientific grade TDI-CCD, while the analog domain TDI-CMOS method requires complex hardware circuit design and relies on complex CMOS manufacturing process, to achieve more difficult problems. CMOS itself is an area array output, with area array photography and high-definition dynamic video imaging modes. On this basis, the digital domain TDI mode can be realized, which can change the traditional single photography mode of remote sensing satellites and expand the functions of remote sensing cameras. The digital domain TDI algorithm gets rid of the shackles of implementing TDI inside the CMO...

Claims

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Application Information

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IPC IPC(8): H04N5/374H04N5/353
CPCH04N25/53H04N25/768
Inventor 金光宋明珠曲宏松张贵祥陶淑苹
Owner CAPITAL NORMAL UNIVERSITY
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