subtraction image

基本解释

The quality of the subtraction image is improved by the multi exposure.
採用多次曝光技術，提高了相減象的質量。
The quality of the subtraction image was improved and computation time was reduced by selecting edge pixels as triangular control points.
通過計算圖像梯度信息，選取邊緣區域像素作爲控制點，既改善減影圖像質量，又提高運算速度。
The results show that the phenomenon of mackling rails can be detected accurately, and also the category of mackling rails and the offset can also be determined by analysis of the subtraction image.
結果表明：此方法可以較準確地檢測出重影現象，還可以通過分析減影圖來確定重影的種類和偏移量。