Patent ID: 8385724

Claim:
A video processing circuit, comprising: an analog to digital interface, having an input end for receiving an analog video signal and converting to a digital video color level; a sampler, coupled between a reference potential and the input end of the analog to digital interface, and having a controlling end for receiving a correction signal; and a shift error correction circuit, receiving the digital video color level directly from the analog to digital interface, the correction signal, and a target value corresponding to the reference potential for outputting a correction value directly to the analog to digital interface; a clamping pulse generator that generates the correction signal, directly connected to the sampler and the shift error connection circuit, receiving a horizontal synchronizing signal so as to generate the correction signal at a blanking interval within the horizontal synchronizing signal, sending the correction signal to the shift error connection circuit the and sending the same error correction signal to the sampler to turn the sampler on or off.