179 results about "Deblocking filter" patented technology

A decision unit decides whether or not a deblocking filter is applied to color difference components of pixels belonging to a line orthogonal to a block boundary in two adjacent blocks adjacent to each other sandwiching the block boundary of the decoded image, by using color difference components of pixels belonging to a line identical to a line used to decide whether or not the deblocking filter is applied to luminance components of the pixels belonging to the line orthogonal to the block boundary. The filtering unit applies the deblocking to the color difference components of the pixels for which it is decided that the deblocking filter is applied. The present technology can be applied to, for example, a case where encoding and decoding of an image are performed.

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

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.

This disclosure relates to video coding and more particularly to techniques for applying deblocking filters for coded video. In one example, a method of decoding chroma component parameter information for decoding video data comprises: receiving a picture parameter set (PPS) including syntax elements corresponding to a picture; parsing a flag in the PPS indicating whether chroma quantization parameter syntax elements are included in the PPS and whether chroma deblocking parameter syntax elements are included in the PPS; conditionally parsing the chroma quantization parameter syntax elements in the PPS based on the value of the flag; conditionally parsing the chroma deblocking parameter syntax elements in the PPS based on the value of the flag; deriving a quantization parameter based on the chroma quantization parameter syntax elements; and performing a deblocking filter based on the chroma deblocking parameter syntax elements.

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.

The present disclosure relates to deblocking filtering, which may be advantageously applied for block-wise encoding and decoding of images or video signals. In particular, the present disclosure relates to an improved memory management in an automated decision on whether to apply or skip deblocking filtering for a block and to selection of the deblocking filter. The decision is performed on the basis of a segmentation of blocks in such a manner that memory usage is optimized. Preferably, the selection of appropriate deblocking filters is improved so as to reduce computational expense.

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.

A method by which a decoding device decodes an image, according to the present document, comprises the steps of: obtaining image information from a bitstream; generating a reconstructed picture of the current picture; deriving deblocking filter parameter information related to deblocking filter parameters on the basis of the image information; and performing deblocking filtering on the reconstructed picture on the basis of the deblocking filter parameters so as to generate a modified reconstructed picture.

The image decoding device (200) of the present invention is configured to control the deblocking filter applied to the boundary of two adjacent blocks based on whether at least one of the two adjacent blocks satisfies a first condition, wherein the value of the quantization parameter is below a predetermined threshold.

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 deblocking method is provided for deblocking a sub-partition boundary within a coding block during image encoding and / or image decoding process. The coding block is coded in an intra prediction mode and the coding block is partitioned into sub-partitions comprising a first sub-partition and a second sub-partition that is adjacent to the first sub-partition. The method comprises: determining a maximum filter length to be 1 for a first / second sub-partition when a width of the first or second sub-partition is 4 samples, or when a height of the first or second sub-partition is 4 samples; modifying a value of up to one sample of the first or second sub-partition, wherein the value of the up to one sample is obtained from a row or a column of the first or second sub-partition that is perpendicular to and adjacent to the sub-partitions boundary between the first sub-partition and the second sub-partition.

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.

The embodiment of the invention provides a deblocking filtering coding method and device based on a coding block, a decoding method and device, electronic equipment, a storage medium and a computer program product, and relates to the technical field of image processing. The method comprises the following steps: performing deblocking filtering analysis on a coding block, and determining a block-level filtering strategy; based on the filtering strategy, carrying out deblocking filtering processing on the coding block, or skipping to block filtering processing, and reserving the coding block; and setting identification information corresponding to the filtering identification of the coding block based on the filtering strategy. According to the method, deblocking filtering analysis is carried out on coding blocks, and differentiated filtering strategies are adopted for different coding blocks, so that whether deblocking filtering processing is carried out on the coding blocks or not is determined. In this way, more flexible block-level switch control can be added to deblocking filtering processing. Meanwhile, filtering identification is carried out on the filtering strategy adopted by the coding block, so that the decoding end can carry out corresponding processing, the calculation complexity of the decoding end is reduced, and the decoding speed is improved.

An encoder (100) includes a processor and memory. Using the memory, the processor determines an asymmetrical filter characteristic across a block boundary, based on a quantization parameter (S161), and performs deblocking filtering having the filter characteristic determined (S162). For example, when determining the filter characteristic, the processor may determine the filter characteristic so that influence of the deblocking filtering becomes larger as a quantization parameter becomes larger.

Disclosed is a method that includes receiving an image frame having a plurality of coded blocks, determining a prediction unit (PU) from the plurality of coded blocks, determining one or more motion compensation units arranged in an array within the PU, and applying a filter to one or more boundaries of the one or more motion compensation units. Also disclosed is a method that includes receiving a reference frame that includes a reference block, determining a timing for deblocking a current block, performing motion compensation on the reference frame to obtain a predicted frame that includes a predicted block, performing reconstruction on the predicted frame to obtain a reconstructed frame that includes a reconstructed PU, and applying, at the timing for deblocking the current block, a deblocking filter based on one or more parameters to the reference block, the predicted block, or the reconstructed PU.

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 first filter decision value is calculated for a block of pixels in a video frame based on pixel values of pixels in a first line of pixels in the block. A second filter decision value is also calculated for the block based on pixel values of pixels in a corresponding first line of pixels in a neighboring block in the video frame. The first filter decision value is used to determine how many pixels in a line of pixels in the block to filter relative to a block boundary between the block and the neighboring block. The second filter decision value is used to determine how many pixels in a corresponding line of pixels in the neighboring block to filter relative to the block boundary.

The invention provides a data processing method, which comprises the following steps: determining a vertical filtering unit according to an input video block, a first influence area of vertical deblocking filtering being used for determining the vertical filtering unit; performing vertical deblocking filtering on the vertical filtering unit; a horizontal filtering unit is determined according to the input video block, and the first influence area and a second influence area of horizontal deblocking filtering are used for determining the horizontal filtering unit; performing horizontal deblocking filtering on the horizontal filtering unit; and outputting information of a target video block corresponding to the input video block. The invention further provides a data processing device, electronic equipment and a computer readable medium.

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.

An encoding device 1 includes: a transformation unit 13 configured to calculate an orthogonal transform coefficient by performing an orthogonal transformation process on a residual image indicating a difference between the input image and a predicted image of the input image; a quantization unit 14 configured to generate a quantization coefficient by quantizing the orthogonal transform coefficient on the basis of a quantization parameter; an entropy encoding unit 24 configured to generate encoded data by encoding the quantization coefficient; an image decoding unit 10 configured to restore an orthogonal transform coefficient from the quantization coefficient on the basis of the quantization parameter and generate a reconstructed image by adding the predicted image to a residual image restored by performing inverse orthogonal transformation on the orthogonal transform coefficient; and a deblocking filtering unit 18 configured to perform a filtering process on the reconstructed image, wherein the deblocking filtering unit 18 controls a filtering strength depending on a luminance signal level of the reconstructed image and the quantization parameter.

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.