Patent ID: 8401286

Claim:
An image detecting device adapted for receiving a video signal stream including at least one frame, each frame including a plurality of rows of data, each of the rows of data having a plurality of pixels, the frame having an image portion and a blank portion, the image detecting device comprising: a characterizing unit receiving the pixels in sequence and determining a pixel characterization value for each of the pixels by characterizing each of the pixels with a luminance component and a pair of chrominance components and makes the pixel characterization value of each of the pixels equal to one-fourth of the sum of twice the luminance component and the pair of the chrominance components; and a searcher including an image comparator evaluating the pixel characterization value of a current pixel so as to determine whether the current pixel belongs to the image portion, and a blank comparator evaluating the pixel characterization value of the current pixel so as to determine whether the current pixel belongs to the blank portion; wherein the searcher derives a position of the image portion based on the determined results of the image comparator and the blank comparator.