Non-contact type color measurement method and non-contact type color measurement device based on digital technology

Abstract

The invention discloses a non-contact type color measurement method and a non-contact type measurement device based on a digital technology. The non-contact type color measurement method comprises the following steps of: respectively measuring and shooting selected international standard color cards through a spectroradiometer and a digital single lens reflex camera to obtain a CIELAB value and source data of each color sample; then optimizing the CIELAB value and the source data by utilizing least squares fit to obtain a weight coefficient; and calculating the color value corresponding to a measured sample according to the weight coefficient and the picture source data of any measured sample. The non-contact type color measurement method disclosed by the invention has the advantages of simple application, high accuracy, high speed, simultaneous measurement of pairwise samples and very high practical value. Besides, the invention also provides the color measurement device based on the method, and the color measurement device comprises a lamp box (1), an object placing platform (2) and a digital single lens reflex camera (4), wherein the lamp box (1) is used for illuminating the sample; the object placing platform (2) is used for placing the international standard color cards and a sample (3) which needs to be measured; and the digital single lens reflex camera (4) can read the source data.

Description

technical field [0001] The invention relates to a method and device for measuring color, in particular to a non-contact color measurement method and device based on digital technology. Background technique [0002] With the rapid development of industrialization, the transmission of colors in the fields of paint, textiles, inks, etc. has become an indispensable part of the production process. While greatly shortening the production cycle of related products, it has also achieved better and more accurate product quality. Accurate quality management. Therefore, the accuracy of measuring color is an important part of determining the quality of the final product. [0003] There are two main methods of measuring color, including colorimetry using a colorimeter and a spectrophotometer or spectroradiometer. The colorimeter measures the CIEXYZ value, CIELAB value or chromaticity coordinates of the object color. This method is simple, convenient, and fast in measurement speed, but ...

AI Technical Summary

Problems solved by technology

[0004] Whether it is a colorimeter, a spectrophotometer or a spectroradiometer, it must be in contact with the sample for measurement, and it is greatly affected by the material of the sample. For example, samples with high gloss or samples with obvious surface texture are difficult to measure accurately

In addition, neither the colorimeter nor the spectrophotometer can measure the color of samples with uneven surfaces, and the two instruments can only measure one color at a time, which is very time-consuming and laborious for the production industry that requires a large number of measurements

Currently, little research has been done on colorimetry methods for non-contact simultaneous measurement of multiple colors

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