Moving image encoding apparatus

摘要

A moving image encoding apparatus configured to use an image one frame before a target image for encoding to calculate a filtering coefficient for each intra prediction mode of a decoded image from the decoded image and the original image, extracts a filtering coefficient to perform a filtering process to a reference pixel for intra prediction mode determination of a peripheral block of the target block for encoding according to the intra prediction mode of the peripheral block and to generate a reference image for intra prediction mode determination, uses the reference image for intra prediction mode determination to select an intra prediction mode for the target block for encoding, and generates an intra prediction image of the target block for encoding.

主权项

1. A moving image encoding apparatus which uses intra prediction to encode an input original image input by frame on the basis of a block in the input original image, the moving image encoding apparatus comprising:
a decoded image memory configured to store a decoded image of an image one frame before the input original image which includes a target block for encoding, the target block for encoding being a block to be encoded in the input original image; an original image memory configured to store an original image corresponding to the decoded image; a decoded image peripheral information storing unit configured to store an intra prediction mode for each block in the decoded image; a filtering coefficient classification unit configured to calculate a filtering coefficient from the stored decoded image and the stored original image for each intra prediction mode of the decoded image; an encoding target block peripheral information readout unit configured to read an intra prediction mode for a peripheral block of the target block for encoding; a filtering coefficient selecting unit configured to select a filtering coefficient based on the intra prediction mode for the peripheral block for each peripheral block; an original image correcting unit configured to use the filter coefficient selected by the filtering coefficient selecting unit to perform a filtering process to a reference pixel for intra prediction mode determination of the peripheral block and configured to calculate a pixel value as a decoded image of the reference pixel for intra prediction mode determination of the peripheral block; a reference image generating unit configured to generate a reference image for intra prediction mode determination from the pixel value as the decoded image obtained from the original image correcting unit; an intra prediction mode determination unit configured to use the reference image generated by the reference image generating unit to select an intra prediction mode for the target block for encoding; and an intra prediction image generating unit configured to use the intra prediction mode selected by the intra prediction mode determination unit to generate an intra prediction image of the target block for encoding.