Compact image conversion system operable at a high speed

Claim 2

An image conversion system for converting image input data to image output data corresponding to a reproduced image, comprising: image input means for supplying said image input data; image output leans for outputting said image output data; a first table which corresponds a plurality of color information numbers, said plurality of color information numbers being dependent on said image output means, with a plurality of color information to be output by said image output means as said image output data; a second table which corresponds said image input data supplied from said image input means with said plurality of color information numbers in said first table, said correspondence being based on a result of a dither operation; first conversion means for converting said image input data into corresponding ones of said plurality of color information numbers with respective picture element positions in said reproduced image, with reference to said second table; and second conversion means for converting said corresponding ones of said plurality of color information numbers, from said first conversion means, into a corresponding plurality of color information corresponding to said reproduced image, with reference to said first table.

Claim 3

An image conversion system as claimed in claim 1, wherein said image input data is subsampled at regular intervals in a space direction, said first conversion means comprising additional conversion means for converting said subsampled image input data into said corresponding ones of said plurality of color information numbers, with reference to said second table.

Claim 4

An image conversion system as claimed in claim 1, wherein at least either said first table or said second table is previously prepared.

Claim 5

An image conversion system as claimed in claim 1, further comprising third conversion means which produces an enlarged reproduced image with said corresponding ones of said plurality of color information numbers from said first conversion means.

Claim 6

An image conversion system as claimed in claim 1, further comprising third conversion means which produces a reduced reproduced image with said corresponding ones of said plurality of color information numbers from said first conversion means.

Claim 7

An image conversion system as claimed in claim 1, further comprising third conversion means which alternates a writing mode of said image input data dependent on an output position to said image output means.

Claim 8

An image conversion system as claimed in claim 1, further comprising: first table making means for making said first table; and second table making means for making said second table from said first table.

Claim 9

An image conversion system as claimed in claim 1, wherein said image input data is compressed by a predetermined compression algorithm to produce a compressed image input data, said first conversion means comprising: data processing means for extending said compressed image input data in accordance with a predetermined extension algorithm to produce an image processing data of a format following a color space dependent on said data processing means; and additional conversion means for converting said image processing data into said corresponding ones of said plurality of color information numbers, with reference to said second table.

Claim 10

An image conversion system as claimed in claim 8, wherein said image input data is subsampled at regular intervals in a space direction.

Claim 11

An image conversion system comprising: image input means for supplying image input data; image output moans for outputting image output data; a first table which corresponds a plurality of color information numbers, said plurality of color information numbers being dependent on said image output means, with a plurality of color information to be output by said image output loans as said image output data; a second table which corresponds said image input data supplied from said image input means, said image input data including data corresponding to a position of a picture element in an image to be displayed, with said plurality of color information numbers in said first table; first conversion means for converting said image input data and said position of picture element into corresponding ones of said plurality of color information numbers, with reference to said second table; and second conversion means for converting said corresponding ones of said plurality of color information numbers into a corresponding plurality of color information, with reference to said first table.

Claim 12

An image conversion system comprising: image input means for supplying image input data; image output moans for outputting image output data; a first table which corresponds a plurality of color information numbers, said plurality of color information numbers being dependent on said image output means, with a plurality of color information to be output by said image output loans as said image output data; a second table which corresponds said image input data supplied from said image input means, said image input data including data corresponding to a position of a picture element in an image to be displayed, with said plurality of color information numbers in said first table; first conversion means for converting said image input data and said position of picture element into corresponding ones of said plurality of color information numbers, with reference to said second table; and second conversion means for converting said corresponding ones of said plurality of color information numbers into a corresponding plurality of color information, with reference to said first table.

Claim 13

An image conversion system comprising: image input means for supplying image input data; image output means for outputting image output data; a first table which corresponds a plurality of color information numbers, said plurality of color information numbers being dependent on said image output means, with a plurality of color information to be output by said image output means as said image output data; a second table which corresponds said image input data supplied from said image input means, said image input data including data corresponding to a position of a picture element in an image to be displayed, with said plurality of color information numbers from said first table, said correspondence of said second table providing an area modulation of colors; first conversion means for converting said image input data and said position of picture element into corresponding ones of said plurality of color information numbers, with reference to said second table; and second conversion means for converting said corresponding ones of said plurality of color information numbers into a corresponding plurality of color information, with reference to said first table.

Claim 14

An image conversion system comprising: image input means for supplying image input data; image output means for outputting image output data; a first table which corresponds a plurality of color information numbers, said plurality of color information numbers being dependent on said image output means, with a plurality of color information to be output by said image output means as said image output data; a second table which corresponds said image input data supplied from said image input means, said image input data including data corresponding to a position of a picture element in an image to be displayed, with said plurality of color information numbers from said first table, said correspondence of said second table providing an area modulation of colors; first conversion means for converting said image input data and said position of picture element into corresponding ones of said plurality of color information numbers, with reference to said second table; and second conversion means for converting said corresponding ones of said plurality of color information numbers into a corresponding plurality of color information, with reference to said first table.

Claim 15

An image conversion system comprising: an image input unit configured to provide image input data, the image input data corresponding to a first color space; an image output unit configured to receive image output data, the image output data corresponding to a second color space different from the first color space; an output table having a plurality of entries, each of the plurality of entries of the output table including color information corresponding to the second color space, the output table being indexed in accordance with color information indices determined in accordance with the second color space; a conversion table having a plurality of entries, each of the plurality of entries of the conversion table including a color information index for accessing one of the plurality of entries in the output table, the conversion table being indexed in accordance with indices determined in accordance with the first color space; a first converter configured to receive the image input data, said first converter determining corresponding indices for the conversion table based on the image input data, accessing the conversion table based on the determined corresponding indices, and outputting corresponding color information indices from the conversion table as intermediate image output data; and a second converter configured to receive the intermediate image output data, the second converter accessing the output table based on the corresponding color information indices in the intermediate image output data, and outputting corresponding color information from the output table as the image output data.

Claim 16

An image conversion system comprising: an image input unit configured to provide image input data, the image input data corresponding to a first color space; an image output unit configured to receive image output data, the image output data corresponding to a second color space different from the first color space; an output table having a plurality of entries, each of the plurality of entries of the output table including color information corresponding to the second color space, the output table being indexed in accordance with color information indices determined in accordance with the second color space; a conversion table having a plurality of entries, each of the plurality of entries of the conversion table including a color information index for accessing one of the plurality of entries in the output table, the conversion table being indexed in accordance with indices determined in accordance with the first color space; a first converter configured to receive the image input data, said first converter determining corresponding indices for the conversion table based on the image input data, accessing the conversion table based on the determined corresponding indices, and outputting corresponding color information indices from the conversion table as intermediate image output data; and a second converter configured to receive the intermediate image output data, the second converter accessing the output table based on the corresponding color information indices in the intermediate image output data, and outputting corresponding color information from the output table as the image output data.

Claim 17

An image conversion system according to claim 12, wherein the conversion table includes n entries for each predetermined color in the first color space, where n is an integer of one or more, and where the color information index for each of the n entries is based on a predetermined dither operation, and wherein the first converter selects an appropriate one of the n entries based on a picture element position.