6주차 수업 끝

ch05/contrast/main.cpp

@@ -0,0 +1,68 @@
+#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;
+
+	imshow("src", src);
+	imshow("dst", dst);
+
+	waitKey();
+	destroyAllWindows();
+}