Patent application number | Description | Published |
20130101027 | DEBLOCKING CONTROL BY INDIVIDUAL QUANTIZATION PARAMETERS - The present invention relates to deblocking filtering, which may be advantageously applied for block-wise encoding and decoding of image or video signal. In particular, the present invention relates to automated decision on whether to apply or skip deblocking filtering for a block and to selection of the deblocking filter. The decision and/or selection is performed for predefined individual pixels based on the amount of quantization of the block the boundary of which is to be deblocked and on the amount of quantization of its neighboring block adjacent to the boundary, as well as on the position of the individual pixels. | 04-25-2013 |
20130142267 | LINE MEMORY REDUCTION FOR VIDEO CODING AND DECODING - The present invention relates to filtering of image data at first with a deblocking and then with an adaptive loop filter, suitable for the purpose of video coding and decoding. In order to reduce requirements to a memory on chip, used to buffer image lines necessary for filtering, the input signal for the adaptive loop filter is determined from among deblocked pixels, non-deblocked pixels and partially (horizontally only or vertically only) deblocked pixels. The adaptive loop filtering of a deblocked pixel may then apply the filter taps to already deblocked pixels and/or undeblocked pixels and/or partially deblocked pixels in accordance with the determination of the input signal. An advantage of the invention is reduction of the line memory necessary especially at the decoder for processing with both filters. | 06-06-2013 |
20130322548 | EFFICIENT DECISIONS FOR DEBLOCKING - The present invention relates to deblocking filtering, which may be advantageously applied for block-wise encoding and decoding of image or video signal. In particular, the present invention relates to performing an efficient and accurate decision on whether or not to apply deblocking filtering on an image block. The efficient and accurate decision is achieved by performing individual decisions on whether or not to apply deblocking filtering for segments of a boundary between adjacent image blocks, wherein the individual decision are based on pixels comprised in a subset of the pixel lines that the image blocks are composed of. | 12-05-2013 |
20140036998 | QUANTIZATION PARAMETER FOR BLOCKS CODED IN THE PCM MODE - The present invention relates to coding of an image of a video sequence block wisely and, in particular, to coding of a block of samples, which may be chrominace or luminance samples, or samples of any colour space, by a pulse code modulation (PCM). After PCM coding, deblocking filtering may be applied. The deblocking filter may be selected for the present PCM coded block based on its noise and/or the noise of its adjacent block. The noise of the PCM coded block is indicated by a so-called PCM quantization parameter, which is also encoded in the bitstream. | 02-06-2014 |
20140056350 | SIMPLIFICATIONS FOR BOUNDARY STRENGTH DERIVATION IN DEBLOCKING - The present invention relates to an advantageous scheme for boundary strength derivation and decision processing related to deblocking filtering. More particularly, the present invention improves schemes for deciding deblocking and selecting appropriate deblocking filters known in the art so as to reduce the number of calculation cycles and required memory space. | 02-27-2014 |
20140086305 | IMAGE DECODING METHOD, IMAGE CODING METHOD, IMAGE DECODING APPARATUS, IMAGE CODING APPARATUS, AND IMAGE CODING AND DECODING APPARATUS - An image decoding method for decoding a bitstream including a coded signal resulting from coding tiles and slices into which an image is partitioned, the method including decoding the coded signal, wherein each of the slices is either a normal slice having, in a header, information used for an other slice or a dependent slice which is decoded using information included in a slice header of another slice, and when the normal slice starts from a position other than a beginning of a first tile, a second tile coded next to the first tile does not start from the dependent slice. | 03-27-2014 |
20140086306 | IMAGE DECODING METHOD, IMAGE CODING METHOD, IMAGE DECODING APPARATUS, IMAGE CODING APPARATUS, AND IMAGE CODING AND DECODING APPARATUS - An image decoding method for decoding a bitstream including a coded signal resulting from coding slices into which an image is partitioned and each of which includes coding units, includes decoding the coded signal, wherein each of the slices is either a normal slice having, in a slice header, information used for another slice or a dependent slice which is decoded using information included in a slice header of another slice, the image includes rows each of which includes coding units, and when the normal slice starts at a position other than the beginning of the first row, the second row immediately following the first row does not start with the dependent slice. | 03-27-2014 |
20140093180 | IMAGE CODING METHOD, IMAGE DECODING METHOD, IMAGE CODING APPARATUS, IMAGE DECODING APPARATUS, AND IMAGE CODING AND DECODING APPARATUS - A dependency indication is signaled within the beginning of a packet, that is, within the adjacent of a slice header to be parsed or a parameter set. This is achieved, for example, by including the dependency indication at the beginning of the slice header, preferably after a syntax element identifying the parameter set and before the slice address, by including the dependency indication before the slice address, by providing the dependency indication to a NALU header using a separate message, or by using a special NALU type for NALUs carrying dependent slices. | 04-03-2014 |
20140153636 | IMAGE DECODING METHOD, IMAGE CODING METHOD, IMAGE DECODING APPARATUS, IMAGE CODING APPARATUS, AND IMAGE CODING AND DECODING APPARATUS - An image decoding method includes: obtaining a boundary control flag for jointly controlling a deblocking filter operation and a sample adaptive offset operation for a slice boundary of a current slice to be decoded included in a coded picture; decoding the current slice; performing the deblocking filter operation based on the boundary control flag only on at least one of a top slice boundary or a left slice boundary among all slice boundaries of the current slice that has been decoded; and performing the sample adaptive offset operation dependent on the boundary control flag only on the at least one of the top slice boundary or the left slice boundary among all the slice boundaries of the current slice that has been decoded. | 06-05-2014 |