[英]OpenCV Mat image to black and white error
我正在嘗試從目錄中處理圖像,使其成為黑白(灰度),然后將其寫到另一個文件中。 我已經使用OpenCV的C庫完成了,這是代碼
#include <opencv2/opencv.hpp>
using namespace std;
void faktorial(int InSize, uchar *DataIn, uchar *DataOut)
{
for (int i = 0, j = 0; i < InSize; i += 3, j++)
{
DataOut[j] = (DataIn[i] + DataIn[i + 1] + DataIn[i + 2]) / 3;
}
}
int main()
{
char tbLEN[] = "Assassin.jpg";
IplImage* image;
image = cvLoadImage(tbLEN, 1);
IplImage *image2 = cvCreateImage(cvSize(image->width, image->height), IPL_DEPTH_8U, 1);
int height1 = image->height;
int width1 = image->width;
int step = image->widthStep;
int SizeIn = step*height1;
int nChannels = image->nChannels;
uchar* DatIn = (uchar*)image->imageData;
uchar* DatOut = (uchar*)image2->imageData;
faktorial(SizeIn, DatIn, DatOut);
cvNamedWindow("Imagecolor");
cvShowImage("Imagecolor", image);
cvNamedWindow("Gray");
cvShowImage("Gray", image2);
cvWaitKey(0);
return 0;
}
它工作得很好,但是由於C OpenCV已過時,因此我嘗試使用C ++做同樣的事情,但是輸出圖像與我期望的完全不同。 錯誤在哪里? 另外,使用Mat img2(img.rows,img.cols,CV_8UC3)創建空圖像時,我做對了嗎?
這是代碼。
void faktorial(int InSize, uchar *DataIn, uchar *DataOut)
{
for(int i = 0, j = 0; i < InSize; i += 3, j++)
{
DataOut[j] = (DataIn[i] + DataIn[i + 1] + DataIn[i + 2]) / 3;
}
}
int main()
{
Mat img = imread("Assassin.jpg", CV_LOAD_IMAGE_UNCHANGED);
if (img.empty())
{
cout << "Error : Image cannot be loaded..!!" << endl;
return -1;
}
uchar* DataImg = img.data;
int Width = img.cols;
int Height = img.rows;
int Step = img.step;
int SizeInImg = Step * Height;
Mat img2(img.rows,img.cols, CV_8UC3);
uchar* DataImg2 = img2.data;
faktorial(SizeInImg, DataImg, DataImg2);
namedWindow("MyWindow", CV_WINDOW_AUTOSIZE);
imshow("MyWindow", img2);
}
問題在這里
Mat img2(img.rows,img.cols, CV_8UC3);
它應該是
Mat img2(img.rows,img.cols, CV_8UC1);
並且您應該使用CV_LOAD_IMAGE_COLOR
而不是CV_LOAD_IMAGE_UNCHANGED
Mat img = imread(argv[1], CV_LOAD_IMAGE_COLOR);
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.