97 results about "Deblocking filter" patented technology

An example method of video processing includes applying, in a conversion between a video comprising multiple components and a bitstream representation of the video, a deblocking filter to video blocks of the multiple components. A deblocking filter strength for the deblocking filter of each of the multiple components is determined according to a rule that specifies to use a different manner for determining the deblocking filter strength for the video blocks of each of the multiple components.

An example method of video processing includes applying, in a conversion between a video comprising multiple components and a bitstream representation of the video, a deblocking filter to video blocks of the multiple components. A deblocking filter strength for the deblocking filter of each of the multiple components is determined according to a rule that specifies to use a different manner for determining the deblocking filter strength for the video blocks of each of the multiple components.

An image encoding / decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus may comprise deriving a reconstructed block for a current block, deriving a target boundary for the reconstructed block, determining a filter length of a deblocking filter to be applied for the target boundary, and applying the deblocking filter for the target boundary based on the determined filter length. The filter length may be determined based on at least one of a width or height of a transform block adjacent to the target boundary.

An example method for video processing includes applying a deblocking filter to video blocks of multiple components in a conversion between a video including multiple components and a bitstream representation of the video. A deblocking filter strength of the deblocking filter for each component among the multiple components is determined according to a rule that specifies using different ways to determine the deblocking filter strength of the video blocks of each component among the multiple components.

According to a disclosure of the present document, information associated with a deblocking filter for performing deblocking filtering may include chroma component filter parameter information associated with deblocking parameter offsets that are applied to a chroma component. The chroma component filter parameter information may be selectively signaled on the basis of a chroma tool offset presence flag. Therefore, an effect of increasing overall coding efficiency may be derived by signaling chroma component filter parameter information only in the case of not a monochrome color format.

Methods and apparatus for video processing are disclosed. The processing can include video encoding, video decoding, or video transcoding. An example method includes performing a conversion between a video comprising a picture comprising one or more slices and a bitstream of the video, wherein the conversion conforms to a rule that specifies whether a deblocking filter is applied to one or more slices of a reference picture parameter set based on at least a first syntax element included in a picture parameter set, and wherein the first syntax element indicates whether the deblocking filter is disabled for the picture.

In a case that a scaling value of neural network filter strength is set equal to 0, a decoded image before a deblocking filter is output, and thus block noise occurs. In a case that luma and chroma parameters are not taken into consideration, processing for an image of multiple transfer functions and chroma parameters is not appropriately performed. In a unit of a prescribed block, by using a parameter indicating a degree of application of the NN filter, an image after the deblocking filter and an image after an NN filter are combined using a different ratio of the images. Filter processing of a luma image is switched based on a luma parameter, and filter processing of a chroma image is switched based on a chroma parameter.

An encoder: includes circuitry, and memory coupled to the circuitry; stores a first parameter into a bitstream, the first parameter indicating whether a syntax element related to a chroma tool offset is present in the bitstream; when the first parameter indicates that the syntax element is present in the bitstream, (i) stores, in the bitstream, one or more second parameters that are used in deblocking filtering for a chroma sample of a current image, in addition to the syntax element, (ii) performs the deblocking filtering using the one or more second parameters, and (iii) encodes the current image; and when the first parameter indicates that the syntax element is not present in the bitstream, encodes the current image without storing the one or more second parameters into the bitstream.

A video encoder can signal a set of values for one or more deblocking filter parameters in a high-level parameter set. A video decoder can receive and decode the set of values. The video encoder can also encode an index to the set of values at a lower level. The video decoder can decode the index and then use the index to determine a particular value from the set of values to determine the deblocking filter parameters.

This application provides an image processing apparatus and an image processing method. The image processing apparatus may include: a decoding unit that decodes an encoded stream and generates a decoded image; a determining unit that determines whether a deblocking filter for the color difference components of the decoded image needs to be applied to the block boundaries of the decoded image based on a boundary strength calculated using color difference parameters related to color difference; and a filtering unit that applies the deblocking filter to the color difference components of pixels located near the block boundaries based on the result of determining whether the deblocking filter needs to be applied. The boundary strength is calculated independently for the U and V components by independently determining, based on information, whether there are effective coefficients for the U component and the V component in the color difference components within the block sandwiched between the block boundaries, which are the objects of the boundary strength calculation.

An image encoding / decoding method and apparatus may reconstruct a current picture based on at least one of intra prediction and inter prediction, specify a block boundary to which a deblocking filter is applied in the reconstructed current picture, and apply a deblocking filter to a block boundary based on a filter type pre-defined in an encoding apparatus.

A method and apparatus for intra prediction that divides a prediction unit into sub-units and performs prediction in the sub-units are disclosed. An image decoding method according to an embodiment of the present invention includes the following steps: determining whether to divide a current block into a plurality of sub-blocks; when the current block is divided into a plurality of sub-blocks, determining the number of sub-blocks and a division direction for dividing the current block from horizontal division and vertical division based on division information decoded from a bitstream and the width and height of the current block; reconstructing the current block by sequentially reconstructing a plurality of sub-blocks divided according to the division direction and the number of sub-blocks by using intra prediction; establishing a grid at N sample intervals in horizontal and vertical directions, and performing deblocking filtering on a boundary that matches the boundary of the grid among boundaries between a plurality of sub-blocks of the current block.

The present application provides an image encoding apparatus and method, an image decoding apparatus and method, and a storage medium. In a prediction process, one of a first mode, a second mode, and a third mode can be used, the first mode is used to derive prediction pixels of a block using pixels in an image including the block, the second mode is used to derive prediction pixels of the block using pixels in an image different from the image including the block, and the third mode is used to generate prediction pixels of the block using both the pixels in the image including the block and the pixels in the image different from the image including the block. In a case where the third mode is used in at least one of a first block and a second block, an intensity of a deblocking filter process to be performed with respect to a boundary between the first block and the second block is set to an intensity same as in a case where the first mode is used in at least one of the first block and the second block.

A system and method for coding video in which deblocking artifacts are reduced by using modified filtering that is based, at least in part on pixel intensity associated with a coding unit, such that filtering levels are increased as pixel intensity increases. In some embodiments, an offset value or indicator of an offset value for parameters associated with deblocking filter parameters can be associated with a filtering level that is based at least in part on an intensity value.

The image or video processing method and apparatus include: receiving input data associated with a current picture or a current slice in the current picture; determining whether the current picture is a monochrome picture, conditionally transmitting or parsing chroma deblocking parameters, depending on whether the current picture is a monochrome picture; and encoding or decoding the current picture or the current slice. When the current picture is not a monochrome picture, the chroma deblocking parameters are used in a deblocking filtering operation applied to the chroma components of the current picture or the current slice. A syntax element is used to indicate the acquisition of the chroma deblocking parameters, and, based on the value of the syntax element, the chroma deblocking parameters are allowed to be explicitly transmitted in a syntax structure or parsed from a syntax structure, or the chroma deblocking parameters are implicitly inferred.

Provided are an encoding method, a decoding method, an encoder, a decoder, a bitstream, and a storage medium. The decoding method comprises: determining an adjacent block of a current block; on the basis of a prediction mode of the current block and / or the adjacent block, determining a first filtering parameter corresponding to the current block; and on the basis of the first filtering parameter, performing deblocking filtering on the current block.

Describes chroma deblocking tuning for video encoding and decoding. In an exemplary aspect, a method for video processing includes a conversion between a first color component of a current block of a video and a bitstream representation of the first color component of the current block of the video, determining one or more deblocking parameters associated with the first color component involved in a deblocking filter process based on one or more quantization parameters (QPs) associated with a second color component of the current block of the video; and performing the conversion based on the determined deblocking parameters.

An image processing method of performing filtering on image blocks using a plurality of deblocking filters having different filter strengths includes: a first parameter calculating step of calculating a first parameter indicating a boundary strength; a second parameter calculating step of calculating a second parameter indicating a limit value for each of the deblocking filters, based on the first parameter and a quantization parameter; and a selecting step of selecting a deblocking filter to be used in the filtering from among the deblocking filters, using one or more threshold values which are determined based on the second parameter.

In prediction, one of a first mode for deriving, using pixels in an image including a target block, predicted pixels in the target block, a second mode for deriving the predicted pixels in the target block using pixels in an image different from the image including the target block, a third mode for generating the predicted pixels in the target block using both the pixels in the image including the target block and pixels in the different image can be used. If the third mode is used in at least one of the first and second blocks, the intensity of deblocking filter to be performed for the boundary between the first and second blocks is set to the same intensity as in a case in which the first mode is used in at least one of the first and second blocks.

An encoding method and decoding method, and a device implementing the same are provided. The encoding method obtains an intra prediction mode related to a current block from a video signal, obtains prediction samples of the current block by performing intra prediction on the current block based on the intra prediction mode, scans transform coefficients of the current block based on a scanning type of the current block, obtains dequantized transform coefficients of the current block by dequantizing the transform coefficients, obtains residual samples of the current block by performing an inverse-transform on the dequantized transform coefficients, the inverse-transform being performed in a horizontal direction and a vertical direction, reconstructs the current block using the residual samples and the prediction samples, and applies a deblocking filter on the reconstructed current block.

The invention relates to an encoding device, a decoding device, an encoding method, and a decoding method. This encoding device is provided with: a circuit that, during operation, stores a first parameter in a bitstream, said first parameter indicating whether or not a syntax element associated with a chroma tool offset exists in a picture parameter set; when the first parameter indicates that the syntax element exists in the picture parameter set, (i) in addition to the syntax element, one or more second parameters used in a deblocking filter process of a chroma sample of an image to be processed are stored in the bitstream, and if the first parameter indicates that the syntax element exists in the picture parameter set, one or more second parameters used in the deblocking filter process of the chroma sample of the image to be processed are stored in the bitstream. The image encoding method includes the steps of: (i) performing a deblocking filter process using one or more first parameters, (ii) performing the deblocking filter process using the one or more second parameters, (iii) encoding the image to be processed, and if the first parameters indicate that the syntax elements do not exist in the picture parameter set, encoding the image to be processed without storing the one or more second parameters in the bitstream. And (iii) encoding the image to be processed without storing the one or more second parameters in the bitstream if the first parameters indicate that the syntax elements do not exist in the picture parameter set.

A method and image processing device are provided, including a deblocking filter. The deblocking filter modifies values of at most MA samples of the first image block as first filter output values, the at most MA samples being located at a column of the first image block that is perpendicular to and adjacent to the horizontal block edge; and modifies values of at most MB samples of the second image block as second filter output values, the at most MB samples being located at a column of the second image block that is perpendicular to and adjacent to the horizontal block edge. At most a number MA of sample values of the first image block adjacent to the block edge are modified and at most a number MB of sample values of the second image block adjacent to the block edge are modified, wherein MA<MB.

A de-blocking filter includes a reconstructed memory that is configured to store reconstructed pixels corresponding to a current macroblock of a video image to be filtered. The current macroblock includes a set of sub-blocks, each sub-block having horizontal edges and vertical edges. An internal pixel buffer in the de-blocking filter is configured to store pixels corresponding to the set of sub-blocks from the reconstructed memory, and to store partially filtered pixels corresponding to a set of partially filtered macroblocks. An edge order controller in the de-blocking filter is configured to load the pixels corresponding to the set of sub-blocks into a filter engine from the internal pixel buffer, to filter the set of sub-blocks, such that, at least one horizontal edge is filtered before filtering all vertical edges of the set of sub-blocks.