Realtek Semiconductor Inc.

Wu-Jun Chen

Wei Li

Rong Zhang

Wei-min Zeng

Chi-Wang Chai

Wei-Min Zeng

The present invention discloses an image decoding method. Error report information related to an error block in an N-th image frame generated according to an inter-frame coding technology is received by an image encoding apparatus when the image decoding apparatus receives a block of an N+P−1-th image frame. The N+P-th image frame is encoded according to the inter-frame coding technology. Blocks in the N-th image frame before the error block are decoded according to the inter-frame coding technology. A panning motion vector of an N−1-th image frame serves as the motion vector information and the residue information is set to be zero to decode the blocks from the error block to the N+P−1-th image frame according to the inter-frame coding technology. The motion vector information and the residue information of the inter-frame coding blocks in the N+P-th image frame are retrieved to perform decoding according to the inter-frame coding technology.

Image decoding apparatus and method

The present invention discloses an image decoding method. Error report information related to an error block in an N-th image frame generated according to an inter-frame coding technology is received by an image encoding apparatus at a time spot that the image decoding apparatus receives a corresponding block of an N+P−1-th image frame and an N+P-th image frame is encoded according to an inter-frame coding technology. Blocks in the N-th image frame before the occurrence of the error block are decoded according to the inter-frame coding technology. Motion vector information and residue information are set to be zero to decode the blocks from the error block to the N+P−1-th image frame according to the inter-frame coding technology. The motion vector information and the residue information of the inter-frame coding blocks in the N+P-th image frame are retrieved to decode the blocks therein according to the inter-frame coding technology.

A coding algorithm encodes consecutive frames of a video sequence and realizes distributed Gradual Decoding Refresh. The consecutive frames include a first frame, a second frame, and a third frame, and each frame is composed of (X+Y+Z) columns of coding tree units. The algorithm includes: coding X columns of the first frame in an intra coding manner and coding the other columns of the first frame in an inter coding manner and/or the intra coding manner; coding X columns of the second frame in the inter coding manner, coding Y columns of the second frame in the intra coding manner, and coding Z columns of the second frame in the inter and/or intra coding manner(s); and coding X and Y columns of the third frame in the inter coding manner, and coding Z columns of the third frame in the intra coding manner. The X/Y/Z columns (intra-coded columns) are inconsecutive.

Coding algorithm for realizing distributed gradual decoding refresh

Disclosed is a deblocking filter level decision method applicable to an image encoder and used for determining deblocking filter levels of N image frames. The method includes: determining whether a current quantization parameter of a current frame of the N image frames is the same as a previous quantization parameter of any previous frame of the N image frames; if the current quantization parameter is different from the previous quantization parameter, looking up M current deblocking filter reference levels in an established table according to the current quantization parameter and then determining M current deblocking filter levels of the current frame according to the M current deblocking filter reference levels, respectively; and if the current quantization parameter is the same as the previous quantization parameter, determining the M current deblocking filter levels of the current frame according to M previous deblocking filter levels of the previous frame, respectively.

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Suzhou, China

Wu-Jun Chen