Color camera using digital signal processing techniques

摘要

A digital color camera for converting an input optical image to a standard color television signal by using digital signal processing techniques includes: an image sensor for converting optical signals to a series of pixel signals; an analog to digital converting circuit for producing digital pixel signals; a digital signal detecting circuit for separating the digital pixel signals into a digital luminance signal and a digital chrominance difference signal; a digital chrominance signal processing circuit for producing two independent digital chrominance difference signals; a digital luminance signal correction circuit for making a gamma correction on the digital luminance signal; a color television signal encoding circuit for producing an analog standard color television signal from the two independent digital chrominance difference signals and the gamma corrected luminance signal. These circuits are controlled by timing pulses produced by a control timing generating circuit driven by a driving circuit. The digital signal detecting circuit includes: a pixel signal separation circuit for separating the digital pixel signals into two digital color pixel signals; a first digital addition circuit for adding the two digital color pixel signals; a pixel signal inverting circuit for inverting one of the two digital color pixel signals, and a second digital addition circuit for adding the other of the two digital color pixel signals with an output signal of the pixel signal inverting circuit.