openCV中查詢表的作用

OpenCV中查詢表修改畫素與LUT用法

opencv中偽彩色applyColorMap函式

OpenCV基礎篇之查詢表

【OpenCV】之LUT函式

相關引數

- applyColorMap(src, dst, COLORMAP) - src 表示輸入影象 - dst表示輸出影象

核心作用是對灰度圖做偽色彩增強，加快計算速度。

#include <opencv2/opencv.hpp>
#include <iostream>
using namespace cv;
using namespace std;
void customColorMap(Mat &image);
int main(int argc, const char *argv[])
{
       Mat src = imread("C:/Users/admin/Documents/Visual Studio 2015/Projects/Testphoto/peopletest3.jpg");
       if (src.empty())
       {
              printf("could not load image...\n");
              return -1;
       }
       Mat gray, dst;
       // 使用LUT
       applyColorMap(src, dst, COLORMAP_SUMMER);
       // 顯示結果
       imshow("colorMap", dst);
       cvtColor(src, gray, COLOR_BGR2GRAY);
       imshow("gray", gray);
       customColorMap(gray);
       waitKey(0);
       return 0;
}
void customColorMap(Mat &image) {
       int lut[256];
       for (int i = 0; i < 256; i++) {
              if (i < 127)
                     lut[i] = 0;
              else
                     lut[i] = 255;
       }
       int h = image.rows;
       int w = image.cols;
       for (int row = 0; row < h; row++) {
              for (int col = 0; col < w; col++) {
                     int pv = image.at<uchar>(row, col);
                     image.at<uchar>(row, col) = lut[pv];
              }
       }
       imshow("lut demo", image);
}