def flip(src, flipCode, dst=None): # real signature unknown; restored from __doc__"""flip(src, flipCode[, dst]) -> dst. @brief Flips a 2D array around vertical, horizontal, or both axes.圍繞垂直軸，水平軸或兩個軸翻轉2D數組。. . The function cv::flip flips the array in one of three different ways (row. and column indices are 0-based):函數cv :: flip以三種不同的方式之一翻轉數組（行和列索引均基于0）：. \f[\texttt{dst} _{ij} =. \left\{. \begin{array}{l l}. \texttt{src} _{\texttt{src.rows}-i-1,j} & if\; \texttt{flipCode} = 0 \\. \texttt{src} _{i, \texttt{src.cols} -j-1} & if\; \texttt{flipCode} > 0 \\. \texttt{src} _{ \texttt{src.rows} -i-1, \texttt{src.cols} -j-1} & if\; \texttt{flipCode} < 0 \\. \end{array}. \right.\f]. The example scenarios of using the function are the following:以下是使用該函數的示例方案：. * Vertical flipping of the image (flipCode == 0) to switch between. top-left and bottom-left image origin. This is a typical operation. in video processing on Microsoft Windows\* OS.圖像的垂直翻轉（flipCode == 0）以在左上和左下圖像原點之間切換。 這是Microsoft Windows \ * OS上視頻處理中的典型操作。. * Horizontal flipping of the image with the subsequent horizontal. shift and absolute difference calculation to check for a. vertical-axis symmetry (flipCode \> 0).圖像的水平翻轉以及隨后的水平移位和絕對差計算，以檢查垂直軸對稱性（flipCode \> 0）。. * Simultaneous horizontal and vertical flipping of the image with. the subsequent shift and absolute difference calculation to check. for a central symmetry (flipCode \< 0).同時進行圖像的水平和垂直翻轉，以及隨后的偏移和絕對差計算，以檢查中心對稱性（flipCode \ <0）。. * Reversing the order of point arrays (flipCode \> 0 or. flipCode == 0).反轉點數組的順序（flipCode \> 0或flipCode == 0）。. @param src input array.. @param dst output array of the same size and type as src.. @param flipCode a flag to specify how to flip the array; 0 means. flipping around the x-axis and positive value (for example, 1) means. flipping around y-axis. Negative value (for example, -1) means flipping. around both axes.用于指定如何翻轉數組的標志； 0表示繞x軸翻轉，正值（例如1）表示繞y軸翻轉。 負值（例如-1）表示圍繞兩個軸翻轉。. @sa transpose , repeat , completeSymm"""pass

公式1：

示例代碼：

# -*- coding: utf-8 -*- """ @File : 20200119_測試圖片鏡像.py @Time : 2020/1/19 16:27 @Author : Dontla @Email : sxana@qq.com @Software: PyCharm """ import cv2# 讀取圖像 img = cv2.imread('girl-3421489_1920.jpg') # print(img.shape) # (1280, 1920, 3)# 沿x軸翻轉 cv2.imshow('win1', cv2.flip(img, 0)) # 沿y軸翻轉 cv2.imshow('win2', cv2.flip(img, 1)) # 沿x軸y軸翻轉 cv2.imshow('win3', cv2.flip(img, -1)) cv2.waitKey(0)

結果：



參考文章：opencv3+python3完成圖片鏡像實現

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