摘要:
An object-based coding apparatus and method for image signals, wherein upon scanning shape-adaptive transform coefficients of an input image signal transformed in accordance with a shape-adaptive transform, only segments containing such shape-adaptive transform coefficients are scanned. In the scanning operation, segments containing no transform coefficient are skipped, thereby reducing the quantity of data being encoded. An apparatus for and a method of object-based decoding of image signals are also disclosed which can decode bit streams generated using the coding method, thereby reproducing image signals.
摘要:
An apparatus and method of adaptively coding/decoding interlace shape information estimates the amount of motion with respect to the binary alpha block (BAB). A type of the BAB is determined according to the estimated amount of motion. When the BAB falls under a type which needs coding differences between pixel pairs in each line pair comprising an odd and an adjacent even line are calculated and summed up to compute an error of the frame. Differences between pixel pairs in consecutive odd line pairs and differences between pixel pairs in consecutive even line pairs are calculated and summed up to compute an error of individual fields. When the error of the frame is larger than that of the separate fields, field type coding where coding is independently performed with respect to each field is selected. When the error of the separate fields is larger than that of the frame, frame type coding where coding is performed with respect to the frame is selected.
摘要:
An improved grid moving method using a selective pixel search method and an apparatus using the grid moving method which are capable of forming a grid with respect to an image of an object having a shape information and/or an image information, defining a unit region, moving the thusly formed grid, re-constructing an image grid, so that it is possible to reduce the number of blocks which are occupied by an object to be coded, thus significantly reducing the amount of computation and increasing a computation speed. The method includes the steps of forming a grid with respect to an image of an object having a predetermined shape, defining blocks each having a predetermined size, and moving the grid; a search and count step for selectively searching a pixel without searching all pixels, terminating the search when a pixel of the object is first searched, performing a step for determining the block in which an object exists as an object block with respect to the entire blocks, and counting the number of blocks in which the object exists; and determining a new grid start point having a minimum number of blocks in accordance with a result of the counting.
摘要:
An improved grid moving method of an object image and an apparatus using the same which are capable of reducing the amount of information with respect to the image of an object by moving the grid in accordance with a position in which an image of the object having shape information exists, which include the steps of: a moving step for forming a grid over an image of an object having shape information, segmenting the image into a plurality of unit regions, and moving the formed grid; a judging step for judging an amount of the information at each position to which the grid is moved in the moving step; a detecting step for detecting a position at which the amount of the information is reduced; a compaction step for reforming the grid in accordance with the position detected in the detecting step and for coding the image of the object existing in unit regions of the reformed grid; and a motion estimation step for reforming the grid in accordance with the position detected in the detecting step and for estimating the motion of the image of the object in the unit regions in which the image of the object exists among the unit regions segmented by the reformed grid.
摘要:
The present invention selectively applies one of VLC tables stored in a memory for encoding a coded block pattern of a macroblock according to the number of blocks having an object within the macroblock, the number of blocks obtained using shape information, thereby reducing the amount of data transmitted and increasing coding efficiency. The present invention also selectively applies one of VLD tables stored in a memory for decoding a coded block pattern of a macroblock according to the number of blocks having an object within the macroblock, the number of blocks obtained using shape information
摘要:
All macro blocks (MB) decided as an “all_0”, “all_255” or “intra predicted” mode are transmitted as an “intra not coded” mode. A receiving terminal also separates “all_0”, “all_255” and “intra predicted” from the “intra not coded” mode, referring to pixels of a lower layer. “Inter coded && MVD=0” and “Inter coded && MVD!=0” modes are represented as “Inter coded”, and “Inter not coded && MVD=0” and “Inter not coded && MVD!=0” modes are represented as “Inter not coded”. As its result, coding modes on an I-picture can be reduced to two modes and coding modes on a P-picture, or a B-picture, can be lessened to four modes.
摘要:
A method of constructing an encoded stereoscopic image data file is provided. The encoded stereoscopic image data file includes a file type declaration unit indicating whether the file is a stereoscopic image, a meta data unit including one or more track containers for containing meta data of the encoded stereoscopic image data, and an image data unit including one or more stereoscopic image data containers for containing image information of the encoded stereoscopic image data.
摘要:
The present invention selectively applies one of VLC tables stored in a memory for encoding a coded block pattern of a macroblock according to the number of blocks having an object within the macroblock, the number of blocks obtained using shape information, thereby reducing the amount of data transmitted and increasing coding efficiency. The present invention also selectively applies one of VLD tables stored in a memory for decoding a coded block pattern of a macroblock according to the number of blocks having an object within the macroblock, the number of blocks obtained using shape information.
摘要:
In a shape information coding apparatus and method of bordering a binary alpha block (BAB) by pixels to construct contexts when coding binary shape information, adaptive bordering and coding of the shape information is performed in such a manner of receiving the shape information and storing a BAB; determining whether to perform frame mode coding or field mode coding based upon characteristics of the BAB; and when the frame mode coding is selected, performing frame mode bordering before performing frame BAB coding, and when the field mode coding is selected, performing field mode bordering before performing field BAB coding.
摘要:
All macro blocks (MB) decided as an “all_0”, “all_255” or “intra predicted” mode are transmitted as an “intra not coded” mode. A receiving terminal also separates “all_0”, “all_255” and “intra predicted” from the “intra not coded” mode, referring to pixels of a lower layer. “Inter coded && MVD=0” and “Inter coded && MVD!=0” modes are represented as “Inter coded”, and “Inter not coded && MVD=0” and “Inter not coded && MVD!=0” modes are represented as “Inter not coded”. As its result, coding modes on an I-picture can be reduced to two modes and coding modes on a P-picture, or a B-picture, can be lessened to four modes.