Patent ID: 6959111
Filing Date: 2005-10-25
Classification: G01J,G06T

Abstract:
1. A computer color-matching apparatus for paints comprising: (A) a colorimeter, (B) a micro-brilliance-feeling measuring device, and (C) a computer in which a plurality of paint blends, color data and micro-brilliance-feeling data corresponding to each of the paint blends, and color characteristic data and micro-brilliance-feeling data of a plurality of full-color paints are entered, and in which a color-matching calculation logic using the paint blends and the data operates, wherein the micro-brilliance-feeling measuring device comprises: wherein the image photographed by the CCD camera is a two-dimensional image which is divided into a plurality partitions, wherein the micro-brilliance-feeling measuring device measures a brightness of each of the plurality of partitions, wherein the brightness is a digital gradation showing a shading value of the two-dimensional image photographed by the CCD camera for each partition, wherein the image analyzer separately and quantitatively evaluates a glitter feeling and a particle feeling of the two-dimensional image photographed by the CCD camera, wherein the glitter feeling is a perception of an irregular minute brilliance produced by light regularly reflected from a brilliant pigment in the paint film, and wherein the particle feeling is an irregular non-oriented pattern caused by an orientation or an overlap of a brilliant pigment in the paint film containing a brilliant material when observing a sample under a lighting condition in which a brilliance feeling does not easily occur, wherein a total sum of brightness is obtained by totaling the brightness of each of the plurality of partitions, wherein an average brightness is obtained by dividing the total sum of brightness by a total number of the plurality of partitions, wherein a threshold is set at a value which is at least the average brightness, wherein the glitter feeling is evaluated on the basis of a brightness whose value is at least the threshold, and wherein the particle feeling is evaluated by a two-dimensional power-spectrum integral value obtained by integrating the power of a low-spatial-frequency component in accordance with a spatial frequency spectrum constituted by two-dimensional-Fourier-transforming the two-dimensional image, and normalizing the power with a DC component, the two-dimensional image photographed by the CCD camera having been divided into the plurality of partitions.