6주차 수업 끝

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USW
2025-04-02 12:07:31 +09:00
parent 86a66bbeff
commit f2f018da0c
50 changed files with 2399 additions and 51 deletions

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ch05/brightness/main.cpp Normal file
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#include <iostream>
#include "opencv2/opencv.hpp"
using namespace std;
using namespace cv;
int brightness1();
int brightness2();
int brightness3();
int brightness4();
int mosaic();
int main() {
return brightness4();
}
int brightness1() {
Mat src = imread("..\\..\\resources\\images\\lenna.bmp", IMREAD_GRAYSCALE);
if (src.empty()) {
cerr << "imread()" << endl;
return 1;
}
Mat dst = src + 100;
imshow("src", src);
imshow("dst", dst);
waitKey();
destroyAllWindows();
return 0;
}
int brightness2() {
Mat src = imread("..\\..\\resources\\images\\lenna.bmp", IMREAD_GRAYSCALE);
if (src.empty()) {
cerr << "imread()" << endl;
return 1;
}
Mat dst(src.rows, src.cols, src.type());
for (int j = 0; j < src.rows; j++) {
for (int i = 0; i < src.cols; i++) {
dst.at<uchar>(j, i) = src.at<uchar>(j, i) + 100;
}
}
imshow("src", src);
imshow("dst", dst);
waitKey();
destroyAllWindows();
return 0;
}
int brightness3() {
Mat src = imread("..\\..\\resources\\images\\lenna.bmp", IMREAD_GRAYSCALE);
if (src.empty()) {
cerr << "imread()" << endl;
return 1;
}
Mat dst(src.rows, src.cols, src.type());
for (int j = 0; j < src.rows; j++) {
for (int i = 0; i < src.cols; i++) {
dst.at<uchar>(j, i) = saturate_cast<uchar>(src.at<uchar>(j, i) + 100);
}
}
imshow("src", src);
imshow("dst", dst);
waitKey();
destroyAllWindows();
return 0;
}
void on_brightness(int pos, void* userdata) {
Mat src = *(Mat*)userdata;
Mat dst = src + pos;
imshow("dst", dst);
}
int brightness4() {
Mat src = imread("..\\..\\resources\\images\\lenna.bmp", IMREAD_GRAYSCALE);
if (src.empty()) {
cerr << "imread()" << endl;
return 1;
}
namedWindow("dst");
createTrackbar("Brightness", "dst", 0, 100, on_brightness, (void*)&src);
waitKey();
destroyAllWindows();
return 0;
}
int mosaic() {
Mat src = imread("..\\..\\resources\\images\\lenna.bmp", IMREAD_COLOR_RGB);
if (src.empty()) {
cerr << "imread()" << endl;
return 1;
}
const
Mat dst(src.rows, src.cols, src.type());
for (int j = 0; j < src.rows; j++) {
for (int i = 0; i < src.cols; i++) {
dst.at<uchar>(j, i) = src.at<uchar>(j, i) + 100;
}
}
}

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ch05/contrast/main.cpp Normal file
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#include <iostream>
#include "opencv2/opencv.hpp"
using namespace std;
using namespace cv;
int contrast0();
int contrast1();
int contrast2();
Mat sigmoid(const Mat& input) {
Mat output;
exp(-1 * input, output); // e^(-x)
output = 1.0 / (1.0 + output); // sigmoid(x) = 1 / (1 + e^(-x))
return output;
}
int main() {
return contrast0();
}
int contrast0() {
Mat src = imread("..\\..\\resources\\images\\lenna.bmp", IMREAD_GRAYSCALE);
if (src.empty()) {
cerr << "imread()" << endl;
return 1;
}
float alpha = 1.f;
Mat dst = (sigmoid(src * alpha) * 128);
imshow("src", src);
imshow("dst", dst);
waitKey();
destroyAllWindows();
}
int contrast1() {
Mat src = imread("..\\..\\resources\\images\\lenna.bmp", IMREAD_GRAYSCALE);
if (src.empty()) {
cerr << "imread()" << endl;
return 1;
}
float s = 2.f;
Mat dst = s * src;
imshow("src", src);
imshow("dst", dst);
waitKey();
destroyAllWindows();
}
int contrast2() {
Mat src = imread("..\\..\\resources\\images\\lenna.bmp", IMREAD_GRAYSCALE);
if (src.empty()) {
cerr << "imread()" << endl;
return 1;
}
float alpha = 1.f;
Mat dst = src + (src - 128) * alpha;
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ch05/histogram/main.cpp Normal file
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#include <iostream>
#include "opencv2/opencv.hpp"
using namespace std;
using namespace cv;
Mat calcGrayHist(const Mat& img);
Mat getGrayHistImage(const Mat& hist);
Mat histogram_stretching(const Mat& src);
int main() {
VideoCapture video;
video.open("..\\..\\resources\\images\\vtest.avi");
int fps = video.get(CAP_PROP_FPS);
Mat src;
while (true) {
video >> src;
if (src.empty())
return 1;
imshow("sample", src);
if (waitKey(1000 / fps) == 27)
break;
}
cvtColor(src, src, COLOR_BGR2GRAY);
src = src + 20;
Mat src_hist_img = getGrayHistImage(calcGrayHist(src));
Mat dst = histogram_stretching(src);
Mat dst_hist_img = getGrayHistImage(calcGrayHist(dst));
imshow("src", src);
imshow("srcHist", src_hist_img);
imshow("dst", dst);
imshow("dstHist", dst_hist_img);
waitKey();
destroyAllWindows();
return 0;
}
Mat calcGrayHist(const Mat& img) {
CV_Assert(img.type() == CV_8UC1);
Mat hist;
int channels[] = { 0, };
int dims = 1;
const int histSize[] = { 256, };
float graylevel[] = { 0, 256 };
const float* ranges[] = { graylevel };
calcHist(&img, 1, channels, noArray(), hist, dims, histSize, ranges);
return hist;
}
Mat getGrayHistImage(const Mat& hist) {
CV_Assert(hist.type() == CV_32FC1);
CV_Assert(hist.size() == Size(1, 256));
double histMax;
minMaxLoc(hist, 0, &histMax);
Mat imgHist(100, 256, CV_8UC1, Scalar(255));
for (int i = 0; i < 256; i++) {
line(imgHist, Point(i, 100), Point(i, 100 - cvRound(hist.at<float>(i, 0) * 100 / histMax)), Scalar(0));
}
return imgHist;
}
Mat histogram_stretching(const Mat &src) {
double gmin, gmax;
minMaxLoc(src, &gmin, &gmax);
Mat dst = (src - gmin) * 255 / (gmax - gmin);
return dst;
}