OpenCV 為影象轉換為漫畫效果
阿新 • • 發佈:2019-01-29
From 《OpenCV By Example》
1、先canny提取影象的邊緣並強化,翻轉邊緣為黑色,將畫素值轉換為0-1的值 2、將影象進行雙邊濾波處理,然後將畫素值縮短為每10個灰度級為一個值 3、將前兩步得到的結果相乘,顯示結果#include <iostream> using namespace std; #include "opencv2/core.hpp" #include "opencv2/highgui.hpp" #include "opencv2/imgproc.hpp" using namespace cv; int main() { Mat img = imread("1.jpg"); float radius = img.cols > img.rows ? (img.rows / 3) : (img.cols / 3); const double exponential_e = exp(1.0); /** EDgES **/ // Apply median filter to remove possible noise Mat imgMedian; medianBlur(img, imgMedian, 7); // Detect edges with canny Mat imgCanny; Canny(imgMedian, imgCanny, 50, 150); // Dilate the edges Mat kernel = getStructuringElement(MORPH_RECT, Size(2, 2)); dilate(imgCanny, imgCanny, kernel); // Scale edges values to 1 and invert values imgCanny = imgCanny / 255; imgCanny = 1 - imgCanny; // Use float values to allow multiply between 0 and 1 Mat imgCannyf; imgCanny.convertTo(imgCannyf, CV_32FC3); // Blur the edgest to do smooth effect blur(imgCannyf, imgCannyf, Size(5, 5)); /** COLOR **/ // Apply bilateral filter to homogenizes color Mat imgBF; bilateralFilter(img, imgBF, 9, 150.0, 150.0); // truncate colors Mat result = imgBF / 25; result = result * 25; /** MERgES COLOR + EDgES **/ // Create a 3 channles for edges Mat imgCanny3c; Mat cannyChannels[] = { imgCannyf, imgCannyf, imgCannyf }; merge(cannyChannels, 3, imgCanny3c); // Convert color result to float Mat resultf; result.convertTo(resultf, CV_32FC3); // Multiply color and edges matrices // cout << imgCanny3c << endl; multiply(resultf, imgCanny3c, resultf); // cout << resultf << endl; // convert to 8 bits color resultf.convertTo(result, CV_8UC3); // Show image imshow("Result", result); waitKey(0); return 0; }
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效果圖為: