invert color of image

最新推荐文章于 2024-11-22 12:30:36 发布

原创最新推荐文章于 2024-11-22 12:30:36 发布 · 820 阅读

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#image #dst #processing #file

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本文介绍如何使用OpenCV库实现图像反转功能，通过读取图像、获取图像数据并进行数据反转，最终展示处理后的图像。涵盖了图像加载、属性获取、数据操作及显示等关键步骤。

int _tmain(int argc, _TCHAR* argv[]) {
	IplImage *img = NULL;
	int height, width, step, channels;
	uchar *data;
	int i, j, k;
	//load an image
	img = cvLoadImage("Lena.jpg");
	if(!img) {
		perror("Cannot open the file\n");
		return -1;
	}

	//get the image data
	height = img ->height;
	width = img ->width;
	step = img ->widthStep;
	channels = img ->nChannels;
	data = (uchar *)img ->imageData;
	printf("Processing a %d*%d image with %d channels\n", height, width, channels);

	//create a window
	cvNamedWindow("test1", CV_WINDOW_AUTOSIZE);
	cvMoveWindow("test1", 100, 100);

	//invert the image
	//which is equal to cvNot(img);
	/*IplImage *dst = cvCreateImage(cvGetSize(img), img ->depth, channels);
	cvNot(img, dst);*/
	for(int i = 0; i < height; i++) {
		for(int j = 0; j < width; j++) {
			for(k = 0; k < channels; k++) {
				data[i * step + j * channels + k] = 
					255 - data[i * step + j * channels + k];
			}
		}
	}

	//show the image
	cvShowImage("test1", img);

	cvWaitKey(0);

	cvReleaseImage(&img);
	//cvReleaseImage(&dst);
	cvDestroyAllWindows();

	return 0;
}