METHOD OF RECORDING IMAGES AND DATA FOR RETRIEVING THESE IMAGES
First Claim
1. A method of recording images and data for retrieving said images, each of said images assuming the form of a two-dimensional array of rows and columns of pixels, wherein, to develop and record the retrieval data, the image is divided into blocks of pixels each block comprising pixels of at least two rows and two columns, retrieval data is calculated for each block from at least the image data contained in the pixels of that block and said retrieval data of the block is recorded in the form of at least one pixel having a value as a function of said retrieval data.
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Abstract
According to this method, for the formulation and recording of the retrieval data, each of the images (2) taking the form of a two-dimensional array of rows and columns of pixels, the image is divided into blocks (4) of pixels, each block (4) comprising pixels of at least two rows and two columns, retrieval data are calculated for each block (4) on the basis of at least the image data contained in the pixels of this block (4) and the retrieval data calculated is recorded in the form of at least one pixel (5) exhibiting a value dependent on the retrieval data.
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20 Claims
- 1. A method of recording images and data for retrieving said images, each of said images assuming the form of a two-dimensional array of rows and columns of pixels, wherein, to develop and record the retrieval data, the image is divided into blocks of pixels each block comprising pixels of at least two rows and two columns, retrieval data is calculated for each block from at least the image data contained in the pixels of that block and said retrieval data of the block is recorded in the form of at least one pixel having a value as a function of said retrieval data.
Specification