Method of storing images and corresponding storage medium
AssigneeCommissariat a l'Energie Atomique
InventorChristophe Martinez
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Abstract
The invention relates to a method of storing images on a medium able to be etched on the basis of a writing procedure using a laser beam, in which a substrate, preferably flexible, comprises a multiplicity of expanses of lateral dimensions less than 10 millimetres, each reserved for an image, and an expanse reserved for an image comprises as many elementary zones as there are image pixels to be stored, the image stored in an expanse being able to be read by optical magnification means. Each elementary zone comprises an engraved pattern whose diameter represents one respective grey level out of n possible levels.
Claims18
A method of storing images on a medium able to be etched on the basis of a writing procedure using a laser beam, in which a writing zone comprises a multiplicity of expanses of lateral dimensions less than 10 millimetres each reserved for an image, and an expanse reserved for an image comprises as many elementary zones as there are image pixels to be stored, the image stored in an expanse being able to be read by optical magnification means, wherein the elementary zones comprise patterns engraved in the form of spots of different diameters, a diameter value representing one respective grey level out of n possible levels, n being an integer greater than 2.
A system for storing images on a substrate which is writable by means of a writing laser, the images being stored in analogue form, readable by optical magnification means, in a writing zone comprising a multiplicity of expanses of dimensions less than 10 millimetres by 10 millimetres, each corresponding to an image, each expanse comprising as many elementary zones as there are pixels of the image to be stored, system characterized in that it comprises a laser beam optical head and optical head control means able to receive, for the writing of each pixel, information regarding the grey level of the pixel, and able to control the engraving by the head, in an elementary zone corresponding to the pixel, of a pattern having a diameter determined from among n diameters each representing one respective grey level out of n, n being an integer greater than 2.
Medium for storing images comprising a storage layer divided into expanses of lateral dimensions less than 10 millimetres each assigned to an image engraved in the medium, an engraved expanse comprising elementary zones each corresponding to a pixel of the stored image, and the image stored in the zone being observable with the eye through optical magnification means, characterized in that the elementary zones comprise patterns in the form of spots of different diameters from among n possible diameters each corresponding to a grey level of the pixel, n being an integer greater than 2.
Dependencies are inferred from the claim text.