Patent ID: 6753913
Filing Date: 2004-06-22
Classification: H04N

Abstract:
An image processing apparatus having offset and optical black correction coupled to receive an image input signal from a charge coupled device and a video input signal from a video device, comprising:a sampling circuit for sampling the CCD and video input signals at a predetermined reference voltage, the sampling circuit comprises a correlated double sampler comprising, a single-ended amplifier, and a differential amplifier coupled to the single-ended amplifier, wherein the single-ended amplifier is operable in a CCD mode to pass the image input signal and the single-ended amplifier is bypassed in a video mode such that the video input signal is sampled by the differential amplifier solely, and a programmable gain amplifier coupled to receive the sampled signal from the correlated double sampler to amplify the sampled signal; an analog-to-digital converter coupled to the sampling circuit for converting the sampled signal into a digital signal; a digital correction circuit for correcting the optical black level by feeding back the difference between the sampled signal and an optical black reference level such that the difference is added and subtracted from the analog image and video.input signal.