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jashliao 用 VC++ 實現 fanfuhan OpenCV 教學006 ~ opencv-006-Look Up Table(LUT)查找表的使用 [顏色轉換(偽顏色)/手寫灰階轉二值化] 資料來源: https://fanfuhan.github.io/ https://fanfuhan.github.io/2019/03/23/opencv-006/ GITHUB:https://github.com/jash-git/fanfuhan_ML_OpenCV https://github.com/jash-git/jashliao-implements-FANFUHAN-OPENCV-with-VC ★前言: ★主題:     顏色匹配，例如講講灰色圖像進行偽彩色增強     加快計算速度 ★C++ // VC_FANFUHAN_OPENCV006.cpp : 定義主控台應用程式的進入點。 // /* // Debug | x32 通用屬性 | C/C++ | | 一般 | | 其他 Include 目錄 -> C:\opencv\build\include | | 連結器 | |一一般 | | 其他程式庫目錄 -> C:\opencv\build\x64\vc15\lib | | |一輸入 | | 其他相依性 -> opencv_world411d.lib;%(AdditionalDependencies) // Releas | x64 組態屬性 | C/C++ | | 一般 | | 其他 Include 目錄 -> C:\opencv\build\include | | 連結器 | |一般 | | 其他程式庫目錄 -> C:\opencv\build\x64\vc15\lib | | |一輸入 | | 其他相依性 -> opencv_world411.lib;%(AdditionalDependencies) */ #include "stdafx.h" #include #include #include #include using namespace std; using namespace cv; void pause() { printf("Press Enter key to continue..."); fgetc(stdin); } // 自定义LUT ~ 灰階轉二值化 Mat &myColorMap(Mat &image); /* * Look Up Table(LUT)查找表的使用 */ int main() { Mat src = imread("../../images/LinuxLogo.jpg");//IDE 測試路徑 //Mat image = imread("../../../images/l_hires.jpg", IMREAD_GRAYSCALE);//執行檔 測試路徑 if (src.empty()) { cout << "could not load image..." << endl; pause(); return -1; } else { imshow("input_LinuxLogo", src); // 使用LUT Mat dst; /* //僞色彩 COLORMAP_AUTUMN = 0, COLORMAP_BONE = 1, COLORMAP_JET = 2, COLORMAP_WINTER = 3, COLORMAP_RAINBOW = 4, COLORMAP_OCEAN = 5, COLORMAP_SUMMER = 6, COLORMAP_SPRING = 7, COLORMAP_COOL = 8, COLORMAP_HSV = 9, COLORMAP_PINK = 10, COLORMAP_HOT = 11 */ applyColorMap(src, dst, COLORMAP_AUTUMN); imshow("colorMap-COLORMAP_AUTUMN", dst);//秋天 applyColorMap(src, dst, COLORMAP_BONE); imshow("colorMap-COLORMAP_BONE", dst);//骨 applyColorMap(src, dst, COLORMAP_JET); imshow("colorMap-COLORMAP_JET", dst);//噴射 applyColorMap(src, dst, COLORMAP_WINTER); imshow("colorMap-COLORMAP_WINTER", dst);//冬天 applyColorMap(src, dst, COLORMAP_RAINBOW); imshow("colorMap-COLORMAP_RAINBOW", dst);//彩虹 applyColorMap(src, dst, COLORMAP_OCEAN); imshow("colorMap-COLORMAP_OCEAN", dst);//海洋 applyColorMap(src, dst, COLORMAP_SUMMER); imshow("colorMap-COLORMAP_SUMMER", dst);//夏天 applyColorMap(src, dst, COLORMAP_SPRING); imshow("colorMap-COLORMAP_SPRING", dst);//春天 applyColorMap(src, dst, COLORMAP_COOL); imshow("colorMap-COLORMAP_COOL", dst);//涼爽 applyColorMap(src, dst, COLORMAP_HSV); imshow("colorMap-COLORMAP_HSV", dst);//HSV applyColorMap(src, dst, COLORMAP_PINK); imshow("colorMap-COLORMAP_PINK", dst);//粉色 applyColorMap(src, dst, COLORMAP_HOT); imshow("colorMap-COLORMAP_HOT", dst);//熱 // 使用自己的LUT Mat my_dst, gray; cvtColor(src, gray, COLOR_BGR2GRAY); my_dst = myColorMap(gray); imshow("my_dst", my_dst); waitKey(0); } return 0; } // 自定义LUT ~ 灰階轉二值化 Mat &myColorMap(Mat &image) { int lut[256]; for (int i = 0; i < 256; ++i) { if (i < 127) lut[i] = 0; else lut[i] = 255; } for (int row = 0; row < image.rows; ++row) { for (int col = 0; col < image.cols; ++col) { int pv = image.at(row, col); image.at(row, col) = lut[pv]; } } return image; } ★Python: import cv2 as cv src = cv.imread("../images/LinuxLogo.jpg") cv.namedWindow("input", cv.WINDOW_AUTOSIZE) cv.imshow("input", src) dst = cv.applyColorMap(src, cv.COLORMAP_COOL) cv.imshow("output", dst) cv.waitKey(0) cv.destroyAllWindows() ★結果圖: ★延伸說明/重點回顧: