Patent ID: 8659700

Claim:
A method for converting a first video signal into a second video signal, the first video signal and the second video signal comprising a succession of frames each comprising a plurality of points having a luminance, the points of the frames of the second video signal being intended to be displayed on corresponding pixels of a display device, wherein the number of frames and the run rate (frequency) of the two signals is the same, comprising: calculating the luminance (LO n (i,j)) of a point (PO n (i,j)) of a current frame of the second video signal (TO n , with (i,j) indicating a position of the point and n a frame number, by using only a weighted sum of a luminance (LI n (i,j)) of the corresponding point (PI n (i,j)) at the same position (i,j) of a current frame of the first video signal (TI n ) and of a luminance (LI n−1 (i,j)) of the corresponding point (PI n−1 (i,j)) at the same position (i,j) of a previously stored previous frame (TI n−1 ) of the first video signal, wherein the weighted sum weights luminance (LI n (i,j)) and luminance (LI n−1 (i,j)) by coefficients predetermined according to the value of the luminance (LI n (i,j)) and the luminance (LI n−1 (i,j)), such that a luminance variation of the point (PO n (i,j)) is reduced over time; storing the luminance (LI n (i,j)) of the corresponding point (PI n (i,j)) of the current frame of the first video signal (TI n ); calculating the luminance being repeated for a plurality of points of the current frame of the second video signal (TO n ); and storing the luminance being repeated for a plurality of points of the current frame of the first video signal (TI n ).