PICTURE IMPROVEMENT SYSTEM
Systems and methods for effectively enhancing television pictures by correcting line separation effect due to errors in interlace to progressive conversion of a program signal.
1 . A television system with program signal line separation correction, comprising
an audio-video output unit, and
a central processing unit (CPU) coupled to the audio-video output unit, the CPU comprising,
non-volatile memory, and
a logic unit coupled to the non-volatile memory and configured to convert an interlace program signal to a progressive signal and correct line separation defects in the converted program signal.
2 . The television system of claim 1 wherein the program signal is a 1080i program signal.
3 . The television system of claim 2 wherein the logic unit comprises
a line separation detection circuit, and
a line regeneration circuit operably coupled to the line separation detection circuit.
4 . The television system of claim 3 wherein the line separation detection circuit adapted to detect correlations between at least a portion of line n and at least a portion of lines n−2 and n+2.
5 . The television system of claim 4 wherein the adapted to regenerate at least a portion of line n if line separation is detected.
6 . The television system of claim 3 wherein the line separation detection circuit includes a plurality of line memory registers and first and second set of comparators coupled to the plurality of line memory registers.
7 . The television system of claim 6 wherein the first set of comparators are configured to compare a signal of line n with a signal of line n+2 and the signal of line n−2.
8 . The television system of claim 7 wherein the second set of comparators are configured to compare the signal of line n with the signal of line n+1 and the signal of line n−1.
9 . The television system of claim 8 wherein the signals being compared are Y signals.
10 . The television system of claim 8 wherein the signals being compared are C signals.
11 . The television system of claim 3 wherein the logic unit further comprises
a motion detection circuit, and
a interlace-to-progressive (I/P) conversion circuit operably coupled to the motion detection circuit.
12 . The television system of claim 11 wherein the IP conversion circuit includes a 2DIP conversion component and a 3DIP conversion component.
13 . A method for line separation defect correction comprising the steps of
converting an interlaced program signal to a progressive program signal,
detecting a line separation defect in the progressive program signal, and
regenerating a portion of a separated line corresponding to the line separation defect.
14 . The method of claim 13 wherein the step of detecting a line separation defect includes
determining whether there is correlation between line n and lines n+2 and n−2,and
determining whether there is correlation between pixel m and pixels m−1 and m+1.
15 . The method of claim 14 wherein the step of determining whether there is correlation between line n and lines n+2 and n−2 includes comparing the signal of line n with the signal of lines n+2 and n−2.
16 . The method of claim 15 wherein the step of determining whether there is correlation between line n and lines n+2 and n−2 further comprising comparing the signal of line n with the signal of lines n+1 and n−1.
17 . The method of claim 15 wherein the step of determining whether there is correlation between there is correlation between pixel m and pixels m−1 and m+1 includes comparing the signal of pixel m with the signal of pixels m−1 and m+1.
18 . The method of claim 17 wherein the compared signal is a Y signal.
19 . The method of claim 17 wherein the compared signal is a C signal.