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随着制造技术的快速发展 ,三维光学测量技术也得到迅速的发展 ,利用双目CCD(电耦合插件 )摄像机记录的光栅投影测量技术是一种新型的光学测量方法。在该方法的测量过程中 ,通过测量相位值取得测量空间。为了获得连续的高精度测量相位值 ,提出一种结合了格雷 (Gray)编码并能够优化相位精度的相移方法 ,该方法通过投影相位传递函数来优化测量相位值。为了消除光栅投影图像中非正弦、周期变化和其他干扰因素的影响 ,给出投影光栅一种新的光强函数 ,利用这个光强函数能够进一步提高投影光栅测量相位精度。最终 ,通过插值测量相位精度能达到亚像素级。
With the rapid development of manufacturing technology, three-dimensional optical measurement technology has also been rapidly developed. The use of a raster projection measurement technology recorded by a binocular CCD camera is a new type of optical measurement method. During the measurement of this method, the measurement space is acquired by measuring the phase value. In order to obtain continuous, high-precision measured phase values, a phase shift method that combines Gray encoding and optimizes phase accuracy is proposed, which optimizes the measured phase values by projecting the phase transfer function. In order to eliminate the influence of non-sinusoidal, periodic variation and other disturbing factors in the projected image, a new intensity function of projection grating is proposed. With this intensity function, the phase accuracy of projection grating can be further improved. Finally, the phase accuracy can be measured at a sub-pixel level by interpolation.