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Method for achieving smaller-than-one line exposure in CMOS image sensor

A technology of image sensor and exposure time, which is applied in the field of CMOS image sensor exposure and can solve problems such as image overexposure

Inactive Publication Date: 2015-01-14
BEIJING SUPERPIX MICRO TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The CMOS image sensor used in the reversing system is mainly used outdoors, so it is often affected by the strong light of the daylight and the parking lot at night, and the exposure time is already 1 line, but the image sent by the CMOS image sensor is still overexposed in a large area

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  • Method for achieving smaller-than-one line exposure in CMOS image sensor
  • Method for achieving smaller-than-one line exposure in CMOS image sensor

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specific Embodiment approach

[0018] In the CMOS image sensor of the present invention, the method for realizing less than one line exposure, the preferred specific implementation is:

[0019] Including steps:

[0020] When an operation is performed on the pixels in the nth row of the pixel array, a readout operation is first performed on the pixels in the nth row;

[0021] Send the row address of the n+1th row to the pixel array;

[0022] According to the brightness of the current image, calculate the exposure time for normal exposure;

[0023] According to the calculated exposure time, the backward delay time of each row of reset operation is calculated, and the reset operation of each row of pixels is delayed backward, so as to realize the exposure function of less than 1 row.

[0024] In the CMOS image sensor of the present invention, the method for realizing less than one line of exposure, the reset operation of each line of pixels in the CMOS image sensor is delayed backward, so as to realize the function of le...

specific Embodiment

[0025] Taking a CMOS image sensor to output RAW data with a resolution of 1600x1200 as an example for description, the present invention can also be applied to CMOS image sensors of other output formats or CMOS image sensors of other resolutions.

[0026] Such as figure 2 As shown, the specific implementation steps are:

[0027] When an operation is performed on the pixels in the nth row of the pixel array, the readout operation is first performed on the pixels in the nth row;

[0028] Send the row address of the n+1th row to the pixel array;

[0029] According to the brightness of the current image, calculate the exposure time for normal exposure;

[0030] According to the exposure time calculated in 3, calculate the backward delay time for each line of reset operation, so as to realize the exposure function of less than one line.

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Abstract

The invention discloses a method for achieving smaller-than-one line exposure in a CMOS image sensor. The method includes the steps of conducting read-out operation on the nth line of pixels when operation is conducted on the nth line of pixels in a pixel array, sending out the line address of the (n+1)th line to the pixel array, calculating the exposure time of normal exposure according to the luminance of a current image, calculating the time required to be delayed for reset operation of each line according to the calculated exposure time, and delaying the reset operation of each line of pixels so that the smaller-than-one line exposure function can be achieved. The phenomenon that due to the fact that the method is influenced by sunlight and strong light in a parking lot at night when implemented outdoors, large-area exposure occurs can be avoided.

Description

Technical field [0001] The present invention relates to a CMOS image sensor exposure technology, in particular to a method for realizing less than one line exposure in a CMOS image sensor. Background technique [0002] At present, with the vigorous development of image sensor technology in recent years, CMOS image sensors have shined in various technical fields, and more and more industrial and civil equipment have embedded image sensors as a necessary function in the overall product. In the field of automotive electronics, CMOS image sensors have been widely used in recent years. For example, when used in reversing systems, CMOS image sensor technology provides users with great convenience. [0003] In the prior art, the CMOS image sensor mainly uses the rolling shutter mode. Rolling Shutter is an electronic rolling shutter, and its working principle is: for any pixel, it is cleared at the beginning of exposure, and then waiting for exposure, after the exposure time, the signal v...

Claims

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Application Information

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IPC IPC(8): H04N5/353
Inventor 赵晓海程杰刘志碧陈杰
Owner BEIJING SUPERPIX MICRO TECHNOLOGY CO LTD