Colour vision measurement of LED lighting system design

1 lead it

visual measurement is the core of image acquisition and processing. All information from the image, in addition to the quality of the image itself, the light source spectral distribution is another important factor affecting the quality of the visual system image. Colour vision measurement is different from the gray level vision measurement, it is a simple grayscale order change information to the rich color 3 d information. Lighting source and surface reflection spectral characteristic determines the object to be tested visual measuring system is collected by the spectral distribution of light energy, even if the structure and the common way of lighting light source, because the luminescence spectra of different image will have the very big difference. So, full spectrum light source or a specific spectrum of light source in the extraction of target features such as color, outline information plays a very important role. How to use light color features to get the best effect of contrast.

images has been a colour vision measuring lighting system the important direction of development, monochrome leds has small volume, easy integration, simple drive and the advantages of good monochromaticity, than ordinary light luminous intensity, peak wavelength in recent years, half wave bandwidth performance got very big improvement. The special requirements of colour vision measurement system, the author of this paper, combining with the advantages of red, green and blue leds, designed and produced a more color characteristics, digital adjustable brightness, uniform irradiation LED light source.

2 LED light source system 2.

1 design principle and structure analysis according to the color combination of four basic rules: continuous change rule, the rate of complementary color, light, demitint law and replacement rate, good monochromaticity of red, green, blue three colors, LED by independent precisely control the luminous intensity, can simulate various kinds of uniform and stable color. When choosing LED wavelengths, should make the wavelength of 3 kinds of color to match the camera 3 kinds of spectral peak.

can meet the requirements of the light source system should adopt forward lighting technology, namely light irradiation on the target object, one side of the light source camera receiving the reflection of light from objects, so the most conducive to the extraction of color information of the measured target and the characteristics of surface detail. In order to solve the problem of projection and irradiation uniformity problem, we adopt scattered light illumination, namely make 3 kinds of color of light within one and a half spherical reflector diffuse reflection occurs, secondary lighting using reflected light.