Patent ID: 9560242
Date: 2017-01-31
CPC Classifications: G01J,H04N

Claim:
1. A method for the screen calibration for the true-to-original reproduction of surface colors, the spectral reflection distribution of which is known, on a screen, which is operated under incident light from at least one light source with angle of incident outside a gloss angle and with known spectral light distribution, whereby the screen is influenced by adjustment of parameters with software and electronic control in each of a plurality of partial areas of the screen, the method comprising: adjusting a reproduced color impression of the screen in each of the plurality of partial areas of the screen to an original color, whereby the original color is compared to screen colors directly bordering the screen surface, and whereby the screen parameters are varied until the color impression of the original color and the screen appear identical when viewed from a predefined observer angle; storing settings of the screen parameters in a screen profile; positioning at least one mask in front of the screen, wherein the at least one mask has at least one window distributed across the screen, whereby the at least one window is partially covered by an original color of a test surface color, and wherein behind each uncovered area of the window on the screen, a color reproduction allocated to the test surface color is created; controlling the screen with software operated on a computer to change and adjust the brightness of the reproduced color, until a brightness difference between the original color and reproduced color under illumination of the screen is reduced, wherein brightness values are stored as support points and therefrom a brightness profile created which controls an absolute brightness for each color reproduced in a pixel of the screen; and automatically executing brightness calibration and determination of support points for the brightness profile of the screen, wherein as a camera is viewing the mask, for each window of the mask, an area of the surface colors and the colors reproduced by the screen are selected and measured within the area and average color signals are produced, wherein the color signals are supplied to the computer which controls the screen, and wherein the brightness of the color signals are changed repeatedly until, in each window, color signals created via the test surface color and the color reproduction are of identical magnitude.