Patent ID: 8279347

Claim:
A system of edge direction detection for comb filter, comprising: a buffer, for receiving and storing a composite signal; a first filter, connected to the buffer, for filtering the composite signal to produce a first filter signal; a second filter, connected to the buffer, for filtering the composite signal to produce a second filter signal; a first oblique detector, connected to the first filter, for detecting an oblique of the first filter signal to produce a first oblique indication signal and a first oblique direction signal and output a first minimum oblique difference; a second oblique detector, connected to the second filter, for detecting an oblique of the second filter signal to produce a second oblique indication signal and a second oblique direction signal and output a second minimum oblique difference; and a comparator, connected to the first oblique detector and the second oblique detector, for comparing the first oblique indication signal, the second oblique indication signal, the first oblique direction signal and the second oblique direction signal to thereby produce an edge information; wherein the first filter signal comprises a luma signal and a chroma signal, and the second filter signal comprises a luma signal.