Device, method and record medium for video decoding capable of conducting error detection process and concealment process effectively

A video decoding device for decoding a coded video signal which is supplied to the video decoding device as packets each of which containing a plurality of coded block data units which have been generated by encoding blocks each of which is composed of a predetermined number of pixels of a frame of a video signal, comprising:

• an error detection means for judging whether or not an error has occurred to each of the packets and outputting a judgment signal indicating the result of the judgment;
• a packet partitioning means for partitioning the packet after the error detection by the error detection means into the coded block data units, while outputting an address signal indicating addresses of blocks that have been contained in the packets to which the errors have occurred;
• and
• a video decoding means for successively decoding the coded block data units and outputting a decoded video signal containing block data units obtained by the decoding of the coded block data units, which includes:
• a frame memory means for storing the block data units of previously decoded frames and the block data units of a currently decoded frame;
• a block data decoding means for successively decoding the coded block data units and outputting the block data units obtained by the decoding of the coded block data units, while outputting an address signal indicating addresses of blocks which could not be decoded normally due to errors contained in the coded block data;
• a second invalid block concealment means for conducting a concealment process with regard to the block data units corresponding to the addresses indicated by the address signal from the block data decoding means;
• a second invalid block judgment means for judging whether or not each block data unit obtained by the concealment process of the second invalid block concealment means is an invalid block whose pixel values are inadequate, based on pixel values of adjacent blocks;
• and
• a third invalid block concealment means for conducting a concealment process with regard to the block data units which have been judged by the second invalid block judgment means as invalid blocks.

A video decoding method for decoding a coded video signal which is supplied as packets each of which containing a plurality of coded block data units which have been generated by encoding blocks each of which is composed of a predetermined number of pixels of a frame of a video signal, comprising the steps of:

• an error detection step in which whether or not an error has occurred to each of the packets is judged and a judgment signal indicating the result of the judgment is generated;
• a packet partitioning step in which the packet after the error detection of the error detection step is partitioned into the coded block data units, while an address signal, indicating addresses of blocks that have been contained in the packets to which the errors have occurred, is generated;
• a video decoding step in which the coded block data units are successively decoded in order to generate a decoded video signal containing block data units obtained by the decoding of the coded block data units;
• a first invalid block judgment step in which it is judged whether or not each of the block data units corresponding to the addresses indicated by the address signal generated in the packet partitioning step is an invalid block which has been decoded abnormally, based on pixel values of adjacent blocks;
• and
• a first invalid block concealment step in which a concealment process is conducted for the block data units that have been judged in the first invalid block judgment step as invalid blocks.

A video decoding method for decoding a coded video signal which is supplied as packets each of which containing a plurality of coded block data units which have been generated by encoding blocks each of which is composed of a predetermined number of pixels of a frame of a video signal, comprising the steps of:

• an error detection step in which whether or not an error has occurred to each of the packets is judged and a judgment signal indicating the result of the judgment is generated;
• a packet partitioning step in which the packet after the error detection of the error detection step is partitioned into the coded block data units, while an address signal, indicating addresses of blocks that have been contained in the packets to which the errors have occurred, is generated;
• and
• a video decoding step in which the coded block data units are successively decoded in order to generate a decoded video signal containing block data units obtained by the decoding of the coded block data units, which includes:
• a frame memory storage step in which the block data units of previously decoded frames and the block data units of a currently decoded frame are stored in a frame memory means;
• a block data decoding step in which the coded block data units are successively decoded and thereby the block data units as the result of the decoding are obtained, while an address signal, indicating addresses of blocks which could not be decoded normally due to errors contained in the coded block data, is generated;
• a second invalid block concealment step in which a concealment process is conducted for the block data units corresponding to the addresses indicated by the address signal generated in the block data decoding step;
• a second invalid block judgment step in which it is judged whether or not each block data unit obtained by the concealment process in the second invalid block concealment step is an invalid block whose pixel values are inadequate, based on pixel values of adjacent blocks;
• and
• a third invalid block concealment step in which a concealment process is conducted for the block data units which have been judged in the second invalid block judgment step as invalid blocks.

A machine-readable record medium storing a program for instructing an MPU (MicroProcessor Unit) etc. to execute a video decoding process for decoding a coded video signal which is supplied as packets each of which containing a plurality of coded block data units which have been generated by encoding blocks each of which is composed of a predetermined number of pixels of a frame of a video signal, wherein the video decoding process comprises the steps of:

• an error detection step in which whether or not an error has occurred to each of the packets is judged and a judgment signal indicating the result of the judgment is generated;
• a packet partitioning step in which the packet after the error detection of the error detection step is partitioned into the coded block data units, while an address signal, indicating addresses of blocks that have been contained in the packets to which the errors have occurred, is generated;
• a video decoding step in which the coded block data units are successively decoded in order to generate a decoded video signal containing block data units obtained by the decoding of the coded block data units;
• a first invalid block judgment step in which it is judged whether or not each of the block data units corresponding to the addresses indicated by the address signal generated in the packet partitioning step is an invalid block which has been decoded abnormally, based on pixel values of adjacent blocks;
• and
• a first invalid block concealment step in which a concealment process is conducted for the block data units that have been judged in the first invalid block judgment step as invalid blocks.

A machine-readable record medium for decoding a coded video signal which is supplied as packets each of which containing a plurality of coded block data units which have been generated by encoding blocks each of which is composed of a predetermined number of pixels of a frame of a video signal, comprising the steps of:

• an error detection step in which whether or not an error has occurred to each of the packets is judged and a judgment signal indicating the result of the judgment is generated;
• a packet partitioning step in which the packet after the error detection of the error detection step is partitioned into the coded block data units, while an address signal, indicating addresses of blocks that have been contained in the packets to which the errors have occurred, is generated;
• and
• a video decoding step in which the coded block data units are successively decoded in order to generate a decoded video signal containing block data units obtained by the decoding of the coded block data units, which includes:
• a frame memory storage step in which the block data units of previously decoded frames and the block data units of a currently decoded frame are stored in a frame memory means;
• a block data decoding step in which the coded block data units are successively decoded and thereby the block data units as the result of the decoding are obtained, while an address signal, indicating addresses of blocks which could not be decoded normally due to errors contained in the coded block data, is generated;
• a second invalid block concealment step in which a concealment process is conducted for the block data units corresponding to the addresses indicated by the address signal generated in the block data decoding step;
• a second invalid block judgment step in which it is judged whether or not each block data unit obtained by the concealment process in the second invalid block concealment step is an invalid block whose pixel values are inadequate, based on pixel values of adjacent blocks;
• and
• a third invalid block concealment step in which a concealment process is conducted for the block data units which have been judged in the second invalid block judgment step as invalid blocks.

A video decoding apparatus comprising:

• receiving means for receiving an input signal;
• determining means for generating a coded signal from said input signal, for determining an error portion in said coded signal, which is comprised of a plurality of coded block data units, for determining error coded block data units as ones of coded data blocks that include said error portion in said coded signal, and for outputting address signals indicative of said error coded block data units;
• decoding means for decoding each of said plurality of coded block data units of said coded signal to generate decoded block data;
• storing means for storing said decoded block data;
• judging means for receiving said address signals indicative of said error coded block data units, for receiving said decoded block data output from said storing means corresponding to said error coded block data units, and for judging whether each of said error coded block data units is an invalid block;
• and
• error concealing means for error concealing decoded error coded block data units judged by said judging means as being invalid blocks.

A video decoding method comprising:

• receiving an input signal;
• generating a coded signal from said input signal, determining an error portion in said coded signal, which is comprised of a plurality of coded block data units, determining error coded block data units as one of coded data blocks that include said error portion in said coded signal, and outputting address signals indicative of said error coded block data units;
• decoding each of said plurality of coded block data units of said coded signal to generate decoded block data;
• storing said decoded block data in a frame memory;
• receiving said address signals indicative of said error coded block dta units, receiving said decoded block data output from said frame memory corresponding to said error coded block data units, and judging whether each of said error coded block data units is an invalid block;
• and
• error concealing decoded error coded block data units judged by said judging step as being invalid blocks.

A machine-readable record medium storing a program for instructing an MPU (MicroProcessor Unit) to execute a video decoding process for decoding a coded video signal, the video decoding process comprising:

• receiving an input signal;
• generating a coded signal from said input signal, determining an error portion in said coded signal, which is comprised of a plurality of coded block data units, determining error coded block data units as ones of coded data blocks that include said error portion in said coded signal, and outputting address signals indicative of said error coded block data units;
• decoding each of said plurality of coded block data units of said coded signal to generate decoded block data;
• storing said decoded block data in a frame memory;
• receiving said address signals indicative of said error coded block data units, receiving said decoded block data output from said frame memory corresponding to said error coded block data units, and judging whether each of said error coded block data units is an invalid block;
• and
• error concealing decoded error coded block data units judged by said judging step as being invalid blocks.