Subtracting Image Backgrounds 减去图像背景
image subtracting 图像相减
Image subtracting operation 图像灰度差值法
The image subtracting method and the point to arc projection extremum algorithm can derive the pointer and scale marks quickly, and separate the long and short graduation line.
基于差分图像确定投影原点的点弧线投影极值新算法，可快速获取仪表指针和分度线参数，且能区分分度线长短。
However, the HF subband is created by subtracting the synthesized LF subband from original image but not by 2-D high-pass filtering original image.
但是，高频子带并不是通过2-D高通滤波原始图像，而是通过原始图像与合成的低通子带相减得到的。
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