OpenCV C++图像操作常用API

OpenCV C++常用图像操作API, 常用于深度学习网络模型的输入预处理

参考链接：https://learnopencv.com/image-resizing-with-opencv/

imgproc

• cv::Resize(): https://stackoverflow.com/questions/23984191/resize-image-opencv
• cv::flip(): https://docs.opencv.org/3.4/d2/de8/group__core__array.html#gaca7be533e3dac7feb70fc60635adf441
• 根据cv::Rect来crop图像patch: https://stackoverflow.com/questions/8267191/how-to-crop-a-cvmat-in-opencv
• cv::cvtColor 颜色空间转换
• cv::rotate 图像旋转
• cv::transpose
• reshape操作：https://www.cnblogs.com/denny402/p/5035535.html

图像读写：

• cv::imread(filename, Flags)
• ImreadModes: IMREAD_IGNORE_ORIENTATION
• cv::imdecode(Buffer, Flags)
• cv::imwrite(filename, image)

cv::Mat

• 构造函数: https://docs.opencv.org/3.4/d3/d63/classcv_1_1Mat.html

Misc

• Why does OpenCV use BGR color format ?