A method for scanning a coloured surface of a tile and a device for actuating the method

Abstract

The invention relates to a method for scanning a coloured surface (2) of a tile and a device which actuates the method. The device (1 ) for scanning a coloured surface (2) of a tile (3) comprises a matrix of photodetectors (4) comprising a plurality of rows of photodetectors (5) which are parallel and placed side by side, the matrix of photodetectors (4) does not comprise any colour filter above the photodetectors (4) and the rows of photodetectors (5) are near each other and spaced by a distance equal to at least one pixel; the matrix of photodetectors (4) is arranged such as to acquire, in synchrony with a temporal scanning interval, an image of a surface band (6) of a coloured surface (2) to be scanned of a tile (3). The device also comprises: a plurality of lamps (7) each having a light emission spectrum different from a light emission spectrum of another lamp of the plurality of lamps (7); the lamps of the plurality of lamps (7) being arranged such as to illuminate the surface band (6) of the coloured surface (2) to be scanned of the tile (3); the lamps of the plurality of lamps (7) being commandable to switch on at least one at a time at each temporal scanning interval; conveyor means (8) provided for restingly receive and transport the tile (3) to be scanned and for determining a relative movement between the tile (3), on a side, and the matrix of photodetectors (4) and the plurality of lamps (7), on the other side, in a movement direction which is perpendicular to the plurality of rows of photodetectors (5) such that for each surface band (6) of the coloured surface (2) to be scanned of the tile (3) a predetermined number of images is acquired.

Description

technical field [0001] The invention relates to the technical field of color image acquisition, in particular to a method for scanning the colored surface of ceramic tiles and a device for implementing the method. Background technique [0002] The prior art discloses a device for scanning the colored surface of a piece of ceramic tile while moving, and the device includes: a lamp, which emits light of all colors in the visible light range, so as to irradiate a piece of ceramic tile in motion—the color to be scanned at least one surface strip of the surface; and a trilinear camera for acquiring images of the illuminated surface strip of the tile colored surface in motion. [0003] The trilinear camera includes a photodetector matrix, which is composed of three rows of parallel photodetectors in sequence, and red filters, green filters and blue filters are respectively arranged on the positions of the three rows of parallel photodetectors. optical device. The above-mentioned...

AI Technical Summary

Problems solved by technology

[0007] It is well known that changing these criteria even slightly can lead to artifacts, the number of which can be greater depending on the distance between adjacent rows of photodetectors; in the prior art, by minimizing the individual color filters, The distance between adjacent rows of photodetectors has been reduced to a value of about four to five times the pixel size

However, the distance value of multi-row photodetectors is not satisfactory, so a smaller color filter needs to be designed

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