自由格式图像选择(最好在c ++中) [英] free form image selection (preferably in c++)
问题描述
我是新的图像操纵。我们注意到您可以指定
在遮罩图片上绘制非零区域,以表示所选部分图像。
I am new to image manipulation. I have noticed that you can specify a rectangular region of interest and others like circles etc in image manipulation libraries like opencv. Basic paint programs like ms-paint incorporate free form selection but i cannot seem to find a function or tutorial on how to do free form image selection in opencv or other image processing libraries. Any ideas on how to achieve this? PS: My preferred language is c/c++.
One thing you can try:
If the selection can be represented as a sequence of 2d-vectors, you can think of it as a polygon. Allocate a new 1-channel image that will be your mask and fill it with 0. Then use
void cvFillPoly(CvArr* img, CvPoint** pts, int* npts, int contours, CvScalar color, int lineType=8, int shift=0)
documented on
http://opencv.willowgarage.com/documentation/drawing_functions.html
to draw a non-zero region on the mask image to represent the selected part of the image.
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