Opencv图像基础代码

OpenCV目前支持的图像格式包括：

Windows位图文件 - BMP, DIB；
JPEG文件 - JPEG, JPG, JPE；
便携式网络图片 - PNG；
便携式图像格式 - PBM，PGM，PPM；
Sun rasters - SR，RAS；
TIFF文件 - TIFF，TIF;
OpenEXR HDR 图片 - EXR;
JPEG 2000 图片- jp2。
可以用cvSaveImage函数或者imwrite()函数来实现不同图像格式之间的转换，保存时的后缀名就是对应的图片格式。

#define _CRT_SECURE_NO_WARNINGS

#include
#include
#include
#include
#include

using namespace std;
using namespace cv;

int main(int argc, char * argv[])
{
	IplImage* img = 0;
	img = cvLoadImage(argv[1], CV_LOAD_IMAGE_ANYDEPTH | CV_LOAD_IMAGE_ANYCOLOR);
	cvNamedWindow("region of image", CV_WINDOW_AUTOSIZE);
	cvShowImage("region of image", img);
	int num = strlen(argv[1]);
	char* name = new char[num + 1];
	strcpy(name, argv[1]);
	*(name + num - 1) = 'M';
	*(name + num - 2) = 'G';
	*(name + num - 3) = 'P';
	*(name + num) = '\0';
	imwrite(name, img);
	cvWaitKey(0);
	return 0;
}
}

#include
#include
#include
using namespace std;
const int perBoardPixel = 100;
const cv::Size boardSize(8, 8);
const cv::Size resolution(800, 800);
int main()
{
	int basisHeight = (resolution.height - perBoardPixel*boardSize.height) / 2;
	int basisWidth = (resolution.width - perBoardPixel*boardSize.width) / 2;
	if (basisHeight < 0 || basisWidth < 0)
	{
		cout << "Resolution doesn't match!" << endl;
	}
	cv::Mat image(resolution, CV_16UC1, cv::Scalar::all(1023));//white
	int flag = 0;
	for (int j = 0; j < boardSize.height; j++)
	{
		for (int i = 0; i < boardSize.width; i++)
		{
			flag = (i + j) % 2;
			if (flag == 0)
			{
				for (int n = j * perBoardPixel; n < (j + 1) * perBoardPixel; n++)
					for (int m = i * perBoardPixel; m < (i + 1) * perBoardPixel; m++)
						//image.at(n + basisHeight, m + basisWidth) = 0;
				        image.at<ushort>(n + basisHeight, m + basisWidth) = 0;
			}
		}
	}
	cv::imwrite("chessBoard1.pgm", image);
	//cv::waitKey(0);
	return 0;
}