Automatic correction method for matching deviation of double-channel CCD images

An image splicing and automatic correction technology, applied in image communication, color TV parts, TV system parts and other directions, can solve the difference of quantization value, the deviation of left and right image brightness and chromaticity, the performance of power supply system is not completely consistent, etc. question

Active Publication Date: 2010-11-17
ZHEJIANG DAHUA TECH CO LTD
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Problems solved by technology

However, in the actual application circuit, due to the incomplete performance of electronic components, PCB wiring and power supply system, there are some differences in the quantized value after analog-to-digital conversion, so when observing the spliced ​​image, it is found that the left and right images Slight deviations in brightness and chromaticity

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  • Automatic correction method for matching deviation of double-channel CCD images
  • Automatic correction method for matching deviation of double-channel CCD images

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Embodiment Construction

[0014] The principle of the present invention is: due to differences in electronic components, PCB wiring, and power supply systems, there are two deviations in the quantized value of the analog signal after analog-to-digital conversion: one is the range of the quantized value data of the left and right channels. Deviation; one is that there is a deviation in the initial value of the interval of the quantized value data of the left and right channels. The first deviation can be adjusted by adjusting the AGC gain value of the analog-to-digital converter to ensure that the interval range of the quantized value data is consistent; the second deviation can be calculated by calculating the difference between the starting values ​​of the two intervals. Since the system is a linear system, The difference can be subtracted from the overall quantized value data of one of the channels, so as to solve the problem that there is a deviation in the initial value of the interval of the quanti...

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Abstract

The invention discloses an automatic correction method for matching deviation of double-channel CCD images. The method comprises the following steps of: extracting a quantization value of an analog signal, setting a gain difference of an analog-to-digital converter, and adjusting the quantization value of the analog signal and the like. The method realizes automatic deviation correction function by calculating the deviation values of left and right channels according to the data value of the quantified analog signal, adjusting the gain difference of the analog-to-digital converter and adjusting the quantization value, solves the problem of deviation caused by electronic components, PCB wiring and a power supply system in circuit design of a double-channel CCD sensor, and ensures that the left and right images of the matched images have consistent brightness and chrominance. Moreover, the method is suitable for the conventional DSP-based high-definition network camera scheme, and the scheme can be realized only by using the method without changing the conventional hardware and circuits.

Description

technical field [0001] The invention relates to a method for automatic correction of CCD image stitching deviation of a high-definition network camera in the field of security monitoring, in particular to an analog signal of a dual-channel CCD sensor, and there is a deviation when the quantized value after two-way analog-to-digital conversion is used for image stitching automatic correction method. Background technique [0002] At present, in order to increase the frame rate of the image in the high-definition network camera used in the field of security monitoring, a dual-channel output CCD sensor is used. The CCD sensor divides the image into left and right halves, and outputs analog signals through two independent channels. The independent analog-to-digital converter performs analog-to-digital conversion on two different analog signals, and the converted quantized digital signal is sent to the back-end processor, and the processor completes the splicing of the left and ri...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/232H04N5/335
Inventor 殷俊张兴明吴坚
Owner ZHEJIANG DAHUA TECH CO LTD
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