... subtraction 减，减法 subtraction of image 图像减法处理 subtractive color mixture 减色混合 ...
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The quality of the subtraction image was improved and computation time was reduced by selecting edge pixels as triangular control points.
通过计算图像梯度信息，选取边缘区域像素作为控制点，既改善减影图像质量，又提高运算速度。
Our results show significant improvement in calculation speed using the cross template while the quality of the resulting subtraction image remains high.
实验结果表明，改变模板形状后，图像配准速度显著加快，且减影图像质量保持良好。
The quality of the subtraction image is improved by the multi exposure.
采用多次曝光技术，提高了相减象的质量。
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