I want to use a custom checkerboard calibration, online download a piece of code, but print it out and set up from, don't know where the problem is (save the children ), hope everybody comments, below is my code downloaded from the Internet, I set in the code is 10 mm, but it has never been printed ()
# include & lt; Iostream>
# include & lt; An FCNTL. H>
# include & lt; IO. H>
# include & lt; Opencv2/core/core. Hpp>
# include & lt; Opencv2/opencv. Hpp>

using namespace std;
Using the namespace CV;

////method from https://blog.csdn.net/shirly_xr/article/details/83792028
Bool SetResolution (const char * path, int iResolution)
{
The FILE * FILE=fopen (path, "rb +");//- open the image file
if (! The file) return false.
Int len=_filelength (_fileno (file));//- access to the file size
Char * buf=new char (len);
Fread (buf, sizeof (char), len, file).//- the image data read cache
Char * pResolution=(char *) & amp; IResolution;//- iResolution to set the value of the resolution of the, such as 72 dpi
Buf x0d [0]=1;//- set using image density
//- level density, horizontal resolution
Buf x0e [0]=pResolution [1].
Buf [0 x0f]=pResolution [0].
//- vertical density, vertical resolution
Buf [0 x10]=pResolution [1].
Buf x11 [0]=pResolution [0].

//- the file pointer back to the beginning
Fseek (file, 0, SEEK_SET);
//- the data is written to the file, cover the original data, make changes to take effect
Fwrite (buf, sizeof (char), len, file).
The fclose (file);
return true;
}

Int main () {

//custom calibration plate
Int blockSize_mm=10;//block length, unit: mm
Int blockNum=10;//
Int blockNum_col=7;//column


Int resolution_ratio=10;
Int blockSize_pixel=blockSize_mm * resolution_ratio;
Int edge_size_pixel=blockSize_pixel/2;

Int imageSize=blockSize_pixel * blockNum;

Int imageSize_col=blockSize_pixel * blockNum_col;
Cout & lt; <"ImageSize=" & lt; Mat chessBoard=CV: : Mat: : zeros (imageSize, imageSize_col CV_8UC1);

Cout & lt; <"ChessBoard. The size ()=" & lt;
For (int I=0; I & lt; ImageSize_col; I=I + blockSize_pixel) {//column

for (int j=0; J & lt; ImageSize; J={j + blockSize_pixel)
Mat ROI=chessBoard (the Rect (I, j, blockSize_pixel, blockSize_pixel));
If (((I + j)/blockSize_pixel) % 2==0)
ROI. SetTo (Scalar: : all (0));
The else
ROI. SetTo (Scalar: : all (255));
}
}

Mat chessBoard_final=CV: : Mat: : zeros ((imageSize + blockSize_pixel), (imageSize_col + blockSize_pixel), CV_8UC1);

ChessBoard_final. SetTo (Scalar: : all (255));

The Rect chessBoard_rect=the Rect (edge_size_pixel edge_size_pixel, imageSize_col, imageSize);

Cout & lt; <"ChessBoard_final. The size ()=" & lt;
//chessBoard_final (chessBoard_rect)=chessBoard;

ChessBoard. CopyTo (chessBoard_final (chessBoard_rect));
Imshow (" Chess board ", chessBoard_final);
Imwrite (" chessBoard. JPG ", chessBoard_final);

Int iResolution=254;//image resolution
Char path [20]="./chessBoard. JPG ";
SetResolution (path, iResolution);

WaitKey (3000);
return 0;
}

CodePudding user response:

Try the printer resolution 300 dpi or 600 dpi