Patent ID: 7636129

Claim:
An apparatus for detecting video data having a first field and a second field, comprising: a pixel detector for comparing a target pixel in the first field and a plurality of comparing pixels in the second field to generate a plurality of comparison results, and producing a comparison value corresponding to the target pixel according to the comparison results; a counting circuit coupled to the pixel detector for generating a count value according to the comparison values corresponding to the pixels in the first field; and a decision circuit coupled to the counting device, for generating a decision value according to the count value; wherein the counting circuit comprises: a pixel counter for summing the comparison values of the pixels on each scan line in the first field to generate a plurality of line summation values, each line summation value corresponding to a sum of the comparison values of one of the scan lines in the first field; a line comparator for comparing the line summation value for each scan line in the first field with a first threshold value to generate a plurality of line comparison values, each line comparison value corresponding to one of the scan lines in the first field; and a counter for summing the line comparison values of all the scan lines in the first field to generate the count value.