High definition camera self-adaption digitization external synchronization method

A camera, self-adaptive technology, applied in the direction of synchronization device, digital transmission system, image communication, etc.

Active Publication Date: 2011-08-31
ZHEJIANG DAHUA TECH
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  • Claims
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Problems solved by technology

[0003] Aiming at the requirement of the external synchronization function of the existing high-definition CCD camera, the present invention provides a method for self-adaptive digital external synchronization of the high-definition CCD camera. Each cycle of the AC power changes, and the user can customize the delay time of the sampling point

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  • High definition camera self-adaption digitization external synchronization method

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Embodiment Construction

[0012] The method for self-adaptive digital external synchronization of a high-definition CCD camera of the present invention can be realized on FPGA, and FPGA includes a synchronous signal generating module, an internal synchronous signal generating module, a synchronous control module, and a timing driving module. The image acquisition process of ordinary CCD cameras is based on the fixed frequency sampling time generated by the internal synchronous signal generation module, and the CCD images are collected at this timing, but there are slight changes in the duty cycle of the external AC. Therefore, in the actual shooting of fluorescent lamps, display screens and other environments that change with the cycle of alternating current, due to the slight change in the working cycle of alternating current, each frame of the captured image of the CCD has the characteristics of uneven brightness and darkness, which is manifested as flickering of the captured image. Sudden change. At...

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Abstract

The invention discloses a high definition CCD (charge coupled device) camera self-adaption digitization external synchronization method, which is realized on a FPGA (field programmable gata array). The FPGA comprises a synchronization signal generation module, an internal synchronization signal generation module, a synchronization control module and a timing sequence driver module, wherein the synchronization signal generation module comprises a counter A and the internal synchronization signal generation module comprises a counter B and a counter C. The high definition CCD large size image acquisition is met by the method, meanwhile, the sampling point time of each frame image is ensured to be changed according to the change of each period of an external alternating current power supply, and the delay time of the sampling point time can be defined by users, and additionally, a sampling high definition CCD camera scheme which adopts the FPGA can be realized only by applying the method without changing the existing hardware and software of a backend processor.

Description

technical field [0001] The invention relates to the field of security monitoring, in particular to an adaptive digital external synchronization method for a high-definition CCD camera. Background technique [0002] At present, the cameras used in the field of security monitoring have been continuously improved with the continuous improvement of technology, and high-definition CCD cameras have gradually matured. Ordinary high-definition CCD cameras do not have the external synchronization function. When shooting fluorescent lamps, display screens and other environments that change with the alternating current cycle, because each frame of image captured by the CCD camera is not synchronized with the alternating current cycle change, the captured image will flicker. , seriously affecting the visual effect. At the same time, the software and hardware solutions of CCD cameras with external synchronization only support standard-definition size images, which cannot meet the needs ...

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Application Information

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IPC IPC(8): H04L7/00H04N5/232
Inventor 殷俊张兴明傅利泉朱江明吴军吴坚
Owner ZHEJIANG DAHUA TECH
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