Abstract. To improve the phase-measuring profilometry measurement speed, phase-shifted fringes can be encoded into color channels. However, for colored objects, the intensity of the fringes in each channel is affected by surface texture. Therefore, a measurement method based on color coding and sinusoidal correction is proposed. First, two color images are encoded. The red (R) and blue (B) channels for the first image and the green (G) channel for the second image are used in a three-step phase-shifting process. Meanwhile, the G channel of the first coded image and the R and B channels of the second coded image are corresponding solid colors. Two color-coded images are projected onto the object’s surface, and the CCD captures the modulated deformed fringe pattern. After decoupling, the channels of the images are separated, the pure color channels are extracted, and the reflectivity of each point on the object surface in the RGB channels is calculated. Then, the intensity of the phase-shifted fringes in the two images is corrected by the calculated reflectivity. A 24-color standard color card and color lion mask were used to verify the method. Compared with the traditional color coding method, we were able to reduce the influence of color texture and obtain better results.

中文翻译：

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基于颜色编码和正弦校正的彩色物体相位测量轮廓

摘要。为了提高相位测量轮廓测量速度，可以将相移条纹编码到颜色通道中。然而，对于有色物体，每个通道中条纹的强度受表面纹理的影响。因此，提出了一种基于颜色编码和正弦校正的测量方法。首先，对两个彩色图像进行编码。第一个图像的红色 (R) 和蓝色 (B) 通道以及第二个图像的绿色 (G) 通道用于三步相移过程。同时，第一编码图像的G通道和第二编码图像的R和B通道为对应的纯色。两个彩色编码图像被投影到物体表面，CCD 捕捉到调制后的变形条纹图案。解耦后，图像的通道被分离，提取纯色通道，计算RGB通道中物体表面各点的反射率。然后，通过计算的反射率校正两幅图像中相移条纹的强度。使用24色标准色卡和彩色狮子面具来验证该方法。与传统的颜色编码方法相比，我们能够减少颜色纹理的影响，获得更好的结果。