opencv split和merge操作
#include<opencv2/opencv.hpp>
#include<iostream>
#include<cassert>
#include<vector>
using namespace cv;
using namespace std;
int main()
{
Mat srcImage=imread("e:/huangshan.jpg");
Mat imageBlue,imageGreen,imageRed;
Mat mergeImage;
//定义一个Mat向量容器保存拆分后的数据
vector<Mat> channels;
//判断文件加载是否正确
assert(srcImage.data!=NULL);
namedWindow("image",CV_WINDOW_AUTOSIZE);
namedWindow("mergeImage",CV_WINDOW_AUTOSIZE);
//通道的拆分
split(srcImage,channels);
//提取蓝色通道的数据
imageBlue = channels.at(0);
//提取绿色通道的数据
imageGreen = channels.at(1);
//提取红色通道的数据
imageRed = channels.at(2);
imshow("image",imageBlue);
//对拆分的通道数据合并
merge(channels,mergeImage);
imshow("mergeImage",mergeImage);
waitKey();
system("pause");
return 0;
}
int main()
{
Mat srcImage = imread("e:/image/1740156366.jpg");
Mat imageBlue, imageGreen, imageRed;
Mat mergeImage;
//定义一个Mat向量容器保存拆分后的数据
vector<Mat> channels;
//判断文件加载是否正确
assert(srcImage.data != NULL);
namedWindow("image", CV_WINDOW_AUTOSIZE);
namedWindow("mergeImage", CV_WINDOW_AUTOSIZE);
//通道的拆分
split(srcImage, channels);
//提取蓝色通道的数据
imageBlue = channels.at(0);
//提取绿色通道的数据
imageGreen = channels.at(1);
//提取红色通道的数据
imageRed = channels.at(2);
imshow("image", imageBlue);
//对拆分的通道数据合并
merge(channels, mergeImage);
imshow("mergeImage1", mergeImage);
waitKey();
//定义一个Mat向量容器保存拆分后的数据
vector<Mat> channels2;
channels2.push_back(imageBlue);
channels2.push_back(imageBlue);
channels2.push_back(imageBlue);
//对拆分的通道数据合并
merge(channels2, mergeImage);
imshow("mergeImage2", mergeImage); //The effect is the same?
waitKey();
waitKey();
system("pause");
return 0;
}
用OpenCV打开一幅3通道的图形,用cvtColor(image,result,COLOR_BGR2GRAY)函数将image转换为灰度图,
并用std::cout<<"channnels : "<<result.channels(); 语句确认了channel为1,
用imwrite("single.bmp",result)或imwrite("single.jpg",result)语句将单通道图像保存为单通道后,
再用image2=imread()重新加载single.bmp或single.jpg,结果图像又是3通道的了,这是怎么回事呢?
猜测你后面去读图像的时候应该使用的是imread()函数的第二个参数使用的是默认值,那么这个时候都是以color形式读取的,所有就又变回3通道了;下面是第二个参数的介绍
flags – Flags specifying the color type of a loaded image:
– CV_LOAD_IMAGE_ANYDEPTH - If set, return 16-bit/32-bit image when the input has
the corresponding depth, otherwise convert it to 8-bit.
– CV_LOAD_IMAGE_COLOR - If set, always convert image to the color one
– CV_LOAD_IMAGE_GRAYSCALE - If set, always convert image to the grayscale one
如果你想读取图像的原样,建议使用如下:"..."替换为自己的图像
Mat test = imread("...", -1);
请教怎么把单通道保存为jpg的图片啊? 先存为灰度,再转为RGB