Layered-based color strip coding method

Abstract

The invention provides a method for coding color strips based on hierarchy. Influenced by color division accuracy, more accurate division effect can be obtained when a color strip is larger than 16 pixels, so that the space has less possibility of being divided into more spaces. So, the images can be divided into a plurality of hierarchies to obtain more regions, thus improving the measurement accuracy. The method comprises the following steps: selecting the colors and number of color stripes, where eight pure colors are selected to improve the color distinction degree and enlarge the measurement range; arranging odd-layered strips by an annular arrangement method to effectively lower the decoding difficulty; and selecting a first and a second strips with fixed sequence with adjacent maximal aberration at the even-number layers to obtain color strip codes with unique sequence period. The color strip coding method can be used for designing projection gratings, and the coding method hassimple programming. The hierarchical ideal is that an object can be divided into a plurality of regions without thinning the strips, thus improving the measurement accuracy, and improving the real-time characteristic and the dynamic measurement characteristic of phase method in a 3D scanning system.

Description

technical field [0001] The invention belongs to the technical field of three-dimensional information reconstruction, in particular to a layer-based color fringe coding method. Background technique [0002] With the development of society and the improvement of people's living standards, more and more color images appear, and the rapid development of computer technology and processing speed can also meet the needs of processing more complex color images, making the processing of color images become possible. The three-dimensional measurement technology adopts the method of color image processing to not only reconstruct the color three-dimensional information, but also because the color image contains more information than the black and white image, the accuracy of the measurement will be improved; at the same time, the color stripe coded grating contains rich information , can reduce the number of collected images, is more suitable for dynamic three-dimensional measurement, ...

AI Technical Summary

Problems solved by technology

[0007] However, due to the large variety of colors in color images, the segmentation accuracy cannot reach the accuracy of black and white images. In order to ensure the accuracy of color segmentation, the width of color stripes is generally more than 16 pixels, so the use of color coding has the problem of low accuracy.

[0008] There are four main problems in the design of color projection raster images: 1. The types of colors in the image should be reduced as much as possible. The more colors in the image, the more unfavorable it is for the later color image segmentation, and the distinction between colors also directly affects Accuracy of Color Segmentation

3. Since the segmentation effect of color stripes with a width of less than 16 pixels is not good, the stripes cannot be thinned in the horizontal direction, but the color stripes with a width of 16 pixels still cannot meet the requirements of measurement accuracy. In order to improve the accuracy, you can use Divide stripes vertically into layers

4. In order to uniquely determine the absolute phase, it is necessary to design a unique fringe sequence, that is, the color fringe coding problem

[0010] 1) Too narrow color fringes will become blurred during projection acquisition, which will increase the difficulty of finding fringes; and too wide will cause the height information to be distributed in a ladder shape, which will affect the measurement accuracy

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