Patent ID: 6803967
Filing Date: 2004-10-12
Classification: H04N

Abstract:
A solid generator comprising:a ramp generator for producing a ramp signal R R=Ah+Bv+C where the coefficients A, B and C are signed values, the ramp signal R being produced for each pixel of a predetermined set of pixels h where h=0 to n of each of a predetermined set of lines v where v=0 to m; a coefficient generator for generating the values of the coefficients A, B and C; control means for causing the ramp signal to be generated with the same values of A and B in each of a plurality of contiguous tiles of a picture; wherein the ramp generator comprises: means for storing the coefficients A, B, and C and first and second accumulated values, adding means for incrementing the first accumulated value by A and the second accumulated value by B, and control means by which, for each of the said lines v, the second accumulated value is incremented by the adding means by B to form C+Bv which is stored as both the first and the second accumulated values, and for each pixel of the said set of pixels on each of the said lines the first accumulated value is incremented by the adding means to form C+Bv+Ah which is stored as the first accumulated value and is output as R.