ECL in a recording and reproduction device in which coefficient groups including coefficient data corresponding to low frequency components of the first axis in at least two overlapped coding blocks are not recorded by the same recording head

A recording and reproducing apparatus with image coding, said recording and reproducing apparatus comprising:

• overlap blocking means for dividing input digital video signals into data in two-dimensional coding blocks, each of the coding blocks having first and second axes and comprising of a plurality of pixel data such that neighboring coding blocks are overlapped with each other so as to share at least one boundary pixel in an axis direction;
• orthogonal transform means for performing two-dimensional frequency conversion for the plurality of pixel data of the coding blocks obtained by said overlap blocking means to generate coefficient data of individual frequencies;
• shuffling means for dividing the coefficient data obtained by said orthogonal transform means into a plurality of coefficient groups so that the coefficient groups do not have a same frequency component of the second axis at least in a frequency region in the coding blocks corresponding to low frequency components of the first axis;
• recording means for locating recording data so that the plurality of coefficient groups in a same coding block obtained by said shuffling means are recorded so as to be dispersed into separate regions on a recording medium, and for adding error correction codes for the coefficient data;
• reproducing and decoding means for reproducing the recording data from the recording medium, for decoding the coefficient data of the plurality of coefficient groups, individually, and for detecting a presence or absence of an error of coefficient data;
• deshuffling means for integrating coefficient data outputted from said reproducing and decoding means into the coding blocks;
• error-correction control means for outputting an error-correction control signal based on a number of errors in a coding block and a number of order of two-dimensional frequencies of coefficient data to which errors have occurred when an error has been detected by said reproducing and decoding means;
• error correcting means for correcting errors of the coefficient data by an error correcting method selected by the error-correction control signal of said error-correction control means with respect to the coding block in which errors have been detected;
• inverse orthogonal transform means for decoding the coefficient data that have been corrected of errors by said error correcting means to pixel data by frequency inverse conversion;
• relocating means for generating digital video signals by relocating the pixel data to the coding blocks;
• a rotary cylinder operable to helically scan the recording medium;
• and
• signal recording means having a plurality of recording heads attached to said rotary cylinder, wherein said recording means outputs the recording data so that coefficient groups including coefficient data corresponding to a same frequency component of the first axis in two coding blocks in an overlapped relationship are not recorded by a same recording head.

A recording and reproducing apparatus with image coding, said recording and reproducing apparatus comprising:

• overlap blocking means for dividing input digital video signals into data in two-dimensional coding blocks, each of the coding blocks having first and second axes and comprising of a plurality of pixel data such that neighboring coding blocks are overlapped with each other so as to share at least one boundary pixel in an axis direction;
• orthogonal transform means for performing two-dimensional frequency conversion for the plurality of pixel data of the coding blocks obtained by said overlap blocking means to generate coefficient data of individual frequencies;
• shuffling means for dividing the coefficient data obtained by said orthogonal transform means into a plurality of coefficient groups so that the coefficient groups do not have a same frequency component of the second axis at least in a frequency region in the coding blocks corresponding to low frequency components of the first axis;
• recording means for locating recording data so that the plurality of coefficient groups in a same coding block obtained by said shuffling means are recorded so as to be dispersed into separate regions on a recording medium, and for adding error correction codes for the coefficient data;
• reproducing and decoding means for reproducing the recording data from the recording medium, for decoding the coefficient data of the plurality of coefficient groups, individually, and for detecting a presence or absence of an error of coefficient data;
• deshuffling means for integrating coefficient data outputted from said reproducing and decoding means into the coding blocks;
• error-correction control means for outputting an error-correction control signal based on a number of errors in a coding block and a number of order of two-dimensional frequencies of coefficient data to which errors have occurred when an error has been detected by said reproducing and decoding means;
• error correcting means for correcting errors of the coefficient data by an error correcting method selected by the error-correction control signal of said error-correction control means with respect to the coding block in which errors have been detected;
• inverse orthogonal transform means for decoding the coefficient data that have been corrected of errors by said error correcting means to pixel data by frequency inverse conversion;
• and
• relocating means for generating digital video signals by relocating the pixel data to the coding blocks,
• wherein said error-correction control means outputs a zero error correction signal for replacing an error coefficient with a zero when a plurality of error coefficients are present in coefficient data having a same frequency in the second axis in two coding blocks in an overlapped relationship and when all the errors are present at numbers of order higher than a specified number of order, said error-correction control means outputs an overlap correlation error correction signal for instructing error correction by making use of a correlation between coefficient data of neighboring coding blocks when a plurality of errors are present in coefficient data having a same frequency in the second axis in two coding blocks in the overlapped relationship and when only one error coefficient is present at a number of order lower than a specified number of order, said error-correction control means outputs a three-dimensional error correction signal for replacing all the coefficient data in the coding block with coefficient data of a preceding frame or preceding field when two or more errors are present at numbers of order lower than a specified number of order for each coding block and when error coefficients are present on a side of lower numbers of order than a specified number of order in coefficient data having a same frequency in the second axis for each coding block, and said error-correction control means outputs a zero error correction signal for replacing the error coefficients with zeroes for coding blocks when no error coefficients are present in the coding blocks on a side of lower numbers of order than a specified number of order on a coding block basis.