NOISE DETECTION METHOD, NOISE DETECTOR, IMAGE DATA PROCESSING UNIT, AND RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a noise detection method that can detect a noise produced part, such as a mosquito noise included in decoded image data resulting from decoding image data generated, through frequency conversion and irreversible compression coding. SOLUTION: A motion in a temporal direction by each block consisting of a prescribed number of pixels of input image data is detected. The dispersion in the motion by each block is detected on the basis of the temporal directional motion by each detected block. The noise produced part is detected, on the basis of the dispersion of the motion detected in the motion dispersion detection step.