BLOCK NOISE REMOVAL DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a block noise removing device capable of surely removing block noise without degrading image quality of a video signal coded and decoded by each block.

SOLUTION: First, the block noise removing device obtains a block boundary correction value for indicating a correction amount for a pixel sample value immediately before a block boundary position and a correction amount for a pixel sample value immediately after the block boundary position for each block boundary position in a pixel sample value sequence for representing a level of each pixel in a video signal on the basis of at least two consecutive pixel sample values immediately before the block boundary position and at least two consecutive pixel sample values immediately after the block boundary position. The block noise removal device then generates a block noise correction signal for representing a correction amount for the pixel sample values corresponding to respective pixels in the pixel block by performing interpolation computations based on the block boundary correction value found for each two adjacent block boundary positions and adds the block noise correction signal to the video signal to produce a noise-removed video signal from which block noise has been removed.

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