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为了克服传统层去反求测量中图像衬比度较低的缺陷 ,提出一种新的基于棱镜反射原理的层去反求图像摄取方法。该方法利用棱镜的全发射和折射作用提高图像衬比度 ,根据物体反射率的高低可分别采用垂直照明和倾斜照明 ,分别可获得高衬比度的亮目标暗背景和暗目标亮背景图像 ,为了校正由于折反射引入的几何变形 ,推出了相应的数学变换模型。该研究已成功投入实际产品校正的应用中 ,研究表明这种新的层去法比起传统的层去法不仅在于图像衬比度高 ,而且物体截面图像的轮廓更清晰可靠、无需填充反差材料 ,有望在零件及模型的反求测量中发挥较大的作用。
In order to overcome the defect of low contrast ratio in traditional de-inverse measurement, a new de-inverse image acquisition method based on the principle of prism reflection is proposed. The method utilizes the full emission and the refraction of the prism to improve the contrast of the image. According to the reflectance of the object, the vertical illumination and the inclined illumination can be respectively used to obtain the bright contrast dark target background and the dark background bright target image, In order to correct the geometric deformation introduced by the catadioptric reflection, a corresponding mathematical transformation model is introduced. The research has been successfully applied in practical product calibration. The research shows that this new layer-to-layer method is more effective than the traditional layer-to-layer method in that the image contrast is high and the outline of the object cross-sectional image is more clear and reliable without filling the contrast material , Is expected to play a larger role in reverse measurement of parts and models.