2019-06-23(day006)——python中的新知识点 - cv.applyColorMap() - cv.COLORMAP_COOL - cv.COLORMAP_JET

python

import cv2 as cv
def function():
    img = cv.imread("../images/test.jpg")
    cv.imshow("test", img)
    dsc = cv.applyColorMap(img, cv.COLORMAP_COOL)
    cv.imshow("COOL", dsc)
    
    img1 = cv.imread("../images/canjian.jpg")
    color_image = cv.applyColorMap(img1, cv.COLORMAP_JET)
    cv.imshow("JET", color_image)
    cv.imshow("canjian", img1)
function()
cv.waitKey(0)
cv.destroyAllWindows()

python中的新知识点

• cv.applyColorMap()
• cv.COLORMAP_COOL
• cv.COLORMAP_JET

c++

#include "all.h"
using namespace std;
using namespace cv;
void customColorMap(Mat &image);
void MyClass::day006() {
    Mat img = read(PATH + "\\images\\cat.jpg");
    Mat dst = Mat::zeros(img.size(), img.type());
    Mat gray;
    imshow("input", img);
    applyColorMap(img, dst, COLORMAP_SUMMER);
    imshow("COLORMAP_SUMMER", dst);
    cvtColor(img, gray, COLOR_BGR2GRAY);
    imshow("gray", gray);
    customColorMap(gray);
    waitKey(0);
}
void customColorMap(Mat &image) {
    int lu[256];
    for (int i = 0; i < 256; i++) {
        if (i > 127)
            lu[i] = 255;
        else
            lu[i] = 0;
    }
    int row = image.rows;
    int col = image.cols;
    for (int i = 0; i < row; i++) {
        for (int j = 0; j < col; j++) {
            int value = image.at(i, j);
            image.at(i, j) = lu[value];
        }
    }
    imshow("custom_map", image);
}

c++中的新知识点

• applyColorMap()
• COLORMAP_SUMMER
• COLOR_BGR2GRAY