Image data coding and/or decoding system capable of high-efficient coding

Claim 2

An image data coding system according to claim 1, wherein said screen-area determining means comprises a resolution detecting circuit for determining the area of the screen by detecting the number of the pixels on the screen reproduced by the input image data signal, and wherein said code-amount assigning control means comprises a code-amount assigning control circuit which maintains the code amount on the whole reproduced screen to be constant while varying a weight distribution function for assigning the code amount to each of the regions on the screen in accordance with the number of the pixels for every region on the reproduced screen.

Claim 3

An image data coding system according to claim 1, wherein said screen-area determining means comprises screen-size setting means for setting the whole area of the reproduced screen on the basis of a predetermined and known information on the area of the screen.

Claim 4

An image data coding system comprising: first coding means for coding a map signal indicative of the position and shape of a content in a screen inputted for every block of picture signals to be coded; orthogonal transform means for performing the orthogonal transform of said picture signals in accordance with said map signal to output an orthogonal transform coefficient; and second coding means for coding said orthogonal transform coefficient derived by said orthogonal transform means, wherein said orthogonal transform means performs the two-dimensional orthogonal transform of the picture signals of all the pixels with respect to the blocks located inside of the content, and performs the orthogonal transform of only the signals of the pixels contained in the content with respect to the blocks containing the boundary portion of the content.

Claim 5

An image data decoding system comprising: first decoding means for decoding a coded map signal indicative of the position and shape of a content in a screen inputted for every block of picture signals; resolution transform means for performing the resolution transform of the map signal decoded by said first decoding means; second decoding means for decoding coded orthogonal transform coefficients; coefficient selecting means for selecting an orthogonal transform coefficient necessary to reproduce an image of a predetermined resolution, from the orthogonal transform coefficients decoded by said second decoding means, on the basis of the map signal resolution -transformed by said resolution transform means; inverse orthogonal transform means for performing the inverse orthogonal transform of the orthogonal transform coefficient selected by said coefficient selecting means; and reproducing means for deriving a regenerative picture signal resolution-transformed from the results of the inverse orthogonal transform by said inverse orthogonal transform means, wherein said inverse orthogonal transform means performs the two-dimensional orthogonal transform of all the coefficients with respect to the blocks located inside of the content among the orthogonal transform coefficients selected by said coefficient selecting means, and performs the inverse orthogonal transform of only the coefficients contained in the content with respect to the blocks containing the boundary portion of the content.

Claim 6

An image data coding system comprising: first coding means for coding a map signal indicative of the position and shape of a content in a screen inputted for every square block of picture signals to be coded; average value separating means for outputting the values of pixels, in the manner of outputting an average value of pixels when blocks include a boundary of the content, outputting a difference value between the average value and a pixel value when blocks are inside of the content, and outputting a zero value when blocks are outside of the content; orthogonal transform means for performing the two-dimensional orthogonal transform of the signals from which the average value has been separated by said average value separating means, to output orthogonal transform coefficients; and second coding means for coding said orthogonal transform coefficients outputted by said orthogonal transform means, and said average value.

Claim 7

An image data decoding system comprising: first decoding means for decoding a coded map signal indicative of the position and shape of a content in a screen inputted for every block of picture signals; resolution transform means for performing the resolution transform of the map signal decoded by said first decoding means; second decoding means for decoding coded orthogonal transform coefficients and an average value of pixels inside of said content; coefficient selecting means for selecting an orthogonal transform coefficient necessary to reproduce an image of a predetermined resolution, from the orthogonal transform coefficients decoded by said second decoding means, on the basis of the map signal resolution -transformed by said resolution transform means; inverse orthogonal transform means for performing the two-dimensional inverse orthogonal transform of the orthogonal transform coefficient selected by said coefficient selecting means; and reproducing means for deriving a resolution -transformed regenerative picture signal by synthesizing the results of the two-dimensional inverse orthogonal transform by said inverse orthogonal transform means, with said average value decoded by said second decoding means, on the basis of said map signal resolution-transformed by said resolution transform means.

Claim 8

An image data coding system comprising: first coding means for coding a map signal indicative of the position and shape of a content in a screen inputted for every square block of picture signals to be coded; average value inserting means for replacing the values of pixels outside of the content by an average value of the values of pixels inside of the content in accordance with said map signal, with respect to the blocks containing the boundary portion of the content in said picture signals; orthogonal transform means for performing the two-dimensional orthogonal transform of the signal of the average value in the blocks produced by said average value inserting means, to output orthogonal transform coefficients; and second coding means for coding said orthogonal transform coefficients outputted by said orthogonal transform means.

Claim 9

An image data decoding system comprising: first decoding means for decoding a coded map signal indicative of the position and shape of a content in a screen inputted for every square block of picture signals; resolution transform means for performing the resolution transform of the map signal decoded by said first decoding means; second decoding means for decoding coded orthogonal transform coefficients; coefficient selecting means for selecting an orthogonal transform coefficient necessary to reproduce an image of a predetermined resolution, from the orthogonal transform coefficients decoded by said second decoding means, on the basis of the map signal resolution -transformed by said resolution transform means; inverse orthogonal transform means for performing the two-dimensional inverse orthogonal transform of the orthogonal transform coefficient selected by said coefficient selecting means; and reproducing means for deriving a resolution -transformed regenerative picture signal by taking out the values of pixels inside of the content from the results of the two-dimensional inverse orthogonal transform by said inverse orthogonal transform means, with respect to the blocks containing the boundary portion of the content, on the basis of the map signal resolution-transformed by said resolution transform means.

Claim 10

An image data coding system comprising: first coding means for coding a map signal indicative of the position and shape of a content in a screen inputted for every square block of picture signals to be coded; vector quantizing means for quantizing said picture signals in the manner of matching said picture signal with code vectors stored in a code book so as to output an index indicative of a code vector which has the highest correlation to said picture signal when blocks are inside of the content, and matching only the signals inside of the content with said code vectors when blocks contain the boundary portion of the content in accordance with said map signal; and second coding means for coding said index outputted by said vector quantizing means.

Claim 11

An image data decoding system comprising: first decoding means for decoding a coded map signal indicative of the position and shape of a content in a screen inputted for every block of picture signals to be coded; resolution transform means for performing the resolution transform of the map signal decoded by said first decoding means; second decoding means for decoding a coded index; and inverse vector quantizing means, having a code book storing therein code vectors indicated by multiple resolutions, for outputting a code vector of a desired resolution designated by the index decoded by said second decoding means when blocks are inside of the content, and deriving a resolution-transformed regenerative picture signal by taking out only the signal inside of the content when the blocks contain the boundary portion of the content, from the code vectors according to the map signal resolution-transformed by said resolution transform means.

Claim 12

An image data coding system comprising: first coding means for coding a map signal indicative of the position and shape of a content in a screen inputted for every square block of picture signals to be coded; subband dividing means for dividing said picture signal into a plurality of subband picture signals; resolution transform means for performing the resolution transform of said map signal into the resolution of each of the subband picture signals divided by said subband dividing means; and second coding means for coding each of the subband picture signals divided by said subband dividing means when blocks are inside of the content, and coding only the signals inside of the content when the blocks contain the boundary portion of the content in said subband picture signals according to the map signal resolution-transformed by said resolution transform means.

Claim 13

An image data decoding system comprising: first decoding means for decoding a coded map signal indicative of the position and shape of a content in a screen inputted for every square block of picture signals to be coded; resolution transform means for performing the resolution transform of the map signal decoded by said first decoding means, into the resolutions of a plurality of subband picture signals; second decoding means for decoding a plurality of coded subband signals; and subband synthesizing means for deriving a resolution-transformed regenerative picture signal by synthesizing only the subband picture signals necessary to reproduce an image of a predetermined resolution among the plurality of subband picture signals decoded by said second decoding means, wherein said second decoding means decodes only the subband picture signals inside of the content with respect to the blocks containing the boundary portion of the content among the subband picture signals, in accordance with the map signal resolution-transformed by said resolution transform means.