Object Spectral Reflectance Reconstruction Method Based on Multispectral LED Illumination

Abstract

The invention discloses an object spectral reflectivity reestablishing method based on multi-spectrum LED illumination. The method comprises the following steps: according to specific parameters of aspectral response curve of a CDD imaging system and light scattering capacity corresponding to a light wavelength, selecting a light source and determining an illumination mode; extracting a pluralityof color primary functions from an existing color database, through linear superposition of a plurality of the primary functions, reestablishing the reflectivity of a measured object; acquiring a weight vector needed for target illumination, and generating an illumination light source of a measuring system; finally, in the case of fixing exposure of a camera, and in different illumination light source conditions, acquiring a camera response zooming factor through excessive spectral image optimization of a standard color atla with the known spectral reflectivity, thereby reestablishing the spectral reflectivity. The beneficial effect is that the method is capable of, in the case of giving an illumination condition and an observation condition, reestablishing the spectral reflectivity of anobject surface through a response value of a charge-coupled device (CCD) digital camera, thereby efficiently acquiring the spectral reflectivity of the object surface.

Description

technical field [0001] The invention relates to the field of object spectral reflectance reconstruction, in particular to a method for object spectral reflectance reconstruction based on multi-spectral LED lighting. Background technique [0002] The transmission and true reproduction of color information is closely related to people's daily life. Digital images are more and more widely used in people's daily life. While enjoying the great convenience brought by digital image equipment, people are also troubled by the inconsistency between color images and original objects to varying degrees. Spectrum-based color reproduction technology can effectively avoid all kinds of troubles caused by metamerism. Some application fields with high requirements for color reproduction need to obtain the spectral reflectance of each point on the target surface. The spectrophotometer can directly measure the spectral reflectance of the object, but it has limitations on the measurement area a...

AI Technical Summary

Problems solved by technology

The spectrophotometer can directly measure the spectral reflectance of the object, but it has limitations on the measurement area and flatness, and its efficiency is low. The spectral scanner has high efficiency but cannot perform non-contact measurement and the measurement area is limited. Obviously, it cannot Satisfy the spectrum-based color reproduction requirements of artworks such as traditional Chinese paintings and oil paintings

Multispectral cameras can efficiently obtain the spectral reflectance of the surface of objects, but the current multispectral cameras have complex structures, high prices, and low efficiency to varying degrees, which limit their practical application.

As a main image acquisition tool, digital cameras have been widely used in people's daily life, but ordinary commercial digital cameras only have three channels, can only collect color information under specific lighting conditions, and cannot meet high-precision color reproduction needs

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