VIDEO IMAGE ENCODING DEVICE, VIDEO IMAGE ENCODING METHOD

摘要

A video image encoding device includes a processor configured to execute a procedure. The procedure includes: computing a pixel average value and a pixel variation level for each of an encoding target block and an adjacent block; determining whether or not a false contour generation condition has been satisfied based on the pixel average values and pixel variation levels computed for the encoding target block and the adjacent block; and if the determination result is that the false contour generation condition has been satisfied, quantizing a prediction error image, representing a difference between an image of the encoding target block and a predicted image of the encoding target block encoded by the intra-frame prediction encoding, with a smaller quantization parameter than a set quantization parameter.

主权项

1. A video image encoding device comprising:
a processor configured to execute a procedure, the procedure comprising: computing a pixel average value and a pixel variation level for each of an encoding target block, selected in a predetermined encoding sequence from a plurality of blocks divided from a frame image to be encoded by intra-frame prediction encoding out of frame images contained in a video image, and at least one adjacent block out of a plurality of adjacent blocks that are adjacent to the encoding target block; determining whether or not a false contour generation condition has been satisfied by the pixel variation levels computed for the encoding target block and the at least one adjacent block being less than a predetermined first threshold value, and an absolute difference value between the pixel average values computed for the encoding target block and the at least one adjacent block being greater than 0, but less than a predetermined second threshold value; and if the determination result is that the false contour generation condition has been satisfied, quantizing a prediction error image, representing a difference between an image of the encoding target block and a predicted image of the encoding target block encoded by the intra-frame prediction encoding, with a smaller quantization parameter than a set quantization parameter set according to a target bit rate.