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Mat src = imread("E:\vs2015\opencvstudy\2.jpg", 1);

if (!src.data) {cout << "could not load image!" << endl;return -1;}

// 灰度化处理

Mat gray_src;cvtColor(src, gray_src, CV_BGR2GRAY);

// 取反处理

Mat gray_src_invert = Mat::zeros(gray_src.size(), gray_src.type());for (int row = 0; row < gray_src.rows; row++) {for (int col = 0; col < gray_src.cols; col++) {int gray_pixel = gray_src.at

(row, col);

gray_src_invert.at

(row, col) = 255 - gray_pixel;

}

}

// 3通道取反处理

Mat dst, dst2;dst.create(src.size(), src.type());dst2.create(src.size(), src.type());

for (int row = 0; row < src.rows; row++) {

for (int col = 0; col < src.cols; col++) {if (src.channels() == 1) {int gray_pixel = gray_src.at

(row, col);

gray_src_invert.at

(row, col) = 255 - gray_pixel;

} else if (src.channels() == 3) {

Vec3b pixel = src.at

(row, col);

dst.at

(row, col) = {255 - pixel[0], 255 - pixel[1], 255 - pixel[2]};

dst2.at

(row, col) = {pixel[2], max(pixel[1], pixel[0])};

}

}

}

// 位操作取反

Mat bitwise_not_dst;bitwise_not(src, bitwise_not_dst);

// ROI截取

Rect r(300, 300, 1000, 400);Mat smallImg = gray_src(r);

cout << "gray_image height:" << gray_src.rows << endl;

cout << "gray_image width:" << gray_src.cols << endl;

imshow("ROI截取图像", smallImg);

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