483results about How to "Improve decoding speed" patented technology

A context-based adaptive binary arithmetic coding (CABAC) method. The CABAC method for a bitstream comprises: detecting a control signal (Sig_first); decoding a first bin representing one of a first coefficient flag (Sig) and a second coefficient flag (Last) from the bitstream according to the control signal (Sig_first); decoding a second bin representing one of the second coefficient flag (Last) and a next first coefficient flag (Sig) from the bitstream according to the decoded first bin and the control signal (Sig_first); and updating the control signal (Sig_first) according to the decoded first and second bins. The first and second bins are decoded in one clock cycle, the first coefficient flag (Sig) indicates whether a corresponding coefficient value is zero, and the second coefficient flag (Last) indicates whether a coefficient map decoding process is finished.

Method and system for decoding a two dimensional code is disclosed. In the binarization process of a two dimensional code image, through performing a dividing operation on the two dimensional code image, each block region has a different grayscale threshold. For each block region, whether a pixel in the block region is determined as black or white is not solely based on the grayscale value of the pixel itself, but also an average grayscale value of a predetermined area set for the block region where the pixel locates. When the predetermined area in which the block region locates has a larger grayscale value as a whole, the grayscale threshold corresponding to the block region may become larger, and vice versa.

The invention discloses a method and a device for intra-frame prediction. The method for the intra-frame prediction comprises the steps of (1) determining the row caching index of a lower boundary pixel value which is near to an upper prediction block of a current prediction block, and determining line caching index of a right boundary pixel value which is near to a left prediction block of the current prediction block; (2) taking a corresponding pixel value of the row caching index of the lower boundary pixel value which is near to the upper prediction block obtained in the lower boundary cache as the lower boundary pixel value which is near to the upper prediction block of the current prediction block; regarding the corresponding pixel value of the line caching index of the left boundary pixel value obtained in the right boundary cache as the right boundary pixel value which is near to the left prediction block of the current prediction block; (3) calculating the pixel value of the current prediction block according to the obtained lower boundary pixel value which is near to the upper prediction block and the right boundary pixel value which is near to the left prediction block. The scheme greatly saves prediction time and improves decoding speed of images.

The invention relates to a two-dimension code and relative decode / code method, wherein said two-dimension code uses round unit module, with space between modules; the round unit module after deep-defocus imaging is returned to round unit module, via unsharp mark filtered, to return back the shape of round unit module. Said design can make the image processing algorism non sensitive to the selection of two-valued threshold value; and since there is space between modules, the adhesive possibility between nearby modules is reduced, to independently position each module. Therefore, the invention can reliably recognize and decode in deep-defocus and low-brightness conditions.

An arithmetic decoding method and apparatus are provided. The apparatus includes an arithmetic decoding apparatus comprising an arithmetic decoding unit determining a range of a most probable symbol and a range of a least probable symbol required to decode a current symbol, comparing a current offset and the range of the most probable symbol required to decode the current symbol, and determining and outputting the value of the current symbol. The apparatus also includes a predicted arithmetic decoding unit determining a range of a most probable symbol and a range of a least probable symbol which are required to decode a next symbol using a prediction that the current symbol is the most probable symbol, comparing a next offset and the range of the most probable symbol required to decode the next symbol, and determining and outputting a range of the next symbol.

A method and apparatus for generating a Joint Photographic Experts Group (JEPG) file achieves fast decoding speed by enabling efficient locating of restart markers at a decoder. The method and apparatus determining a location to insert at least one restart marker by analyzing an image, performing entropy-encoding, by dividing the image into a plurality of segments based on the determined location in order to insert the restart marker, and inserting the restart marker to the determined location in order to insert the reset maker with respect to each of the plurality of entropy-encoded segments. The method performed by the apparatus includes calculating an offset value of the at least one restart marker with respect to each of the plurality of segments, based on a data size of each of the plurality of segments and a data size of the restart marker, calculating an offset value by scan number from a start of image (SOI) marker based on the calculated offset value of the restart marker, in response to the calculated offset value of the restart marker corresponding to a last segment that is entropy-encoded. The method and apparatus further store the calculated offset value by scan number, as additional application data.