Some problem about displaying a raw image file

hayden
51 ●4 ●5 ●9

berak
32993 ●7 ●81 ●312

hello every body, last time I posted this question. I have a raw image of 256 by 256 with 8 bits per pixels. The image is a gray scale image. As per answer, I wrote the following code:

/*******************************************/



#include <opencv\cv.h>
#include <opencv\highgui.h>
#include <math.h>

using namespace cv;

int main(int argc, char** argv){

    Mat img = Mat(256, 256, CV_8UC1);
    img = imread("1.IMG", 1); 
    namedWindow( "RawImage", 1 );
    imshow( "RawImage", img );
    cvWaitKey();

    return 0;
}


/**********************************************/

But I can't display the image. abort is called. Could anyone help me figure out the problem?

Thanks in advance.

add a comment

2 answers

Sort by » oldest newest most voted

answered May 24 '13

berak
32993 ●7 ●81 ●312

looking at the docs for imread, it seems, that raw files are not supported.

you'll have to load the pixels manually, and then build a Mat from that:

#include <stdio.h>
char * imgpath = "1.IMG";
FILE * f = fopen(imgpath,"rb");
if ( ! f )
{
    printf("bad path : %s\n",imgpath);
    return -1;
}
char pixels[256*256];
fread(pixels,256*256,1,f);
fclose(f);

Mat img(256,256,CV_U8C1,pixels);

if there's any chance, that your original pixel ptr will go out of scope, you'll have to additionally clone the Mat, to have its own copy of the pixels:

Mat img = Mat(256,256,CV_U8C1,pixels).clone();

Comments

Dear berak: I have a question about read image file.If the image too large to read, for example I use bmp file. How to open file? Thanks

wuling (May 24 '13)edit

how is this done in Java?

celsius (Oct 1 '14)edit

Since i can't edit:

It is CV_8UC1 instead of CV_U8C1

http://docs.opencv.org/master/d1/d1b/...

danieltak (Jun 27 '17)edit

add a comment

answered May 24 '13

wuling

424 ●4 ●15 ●25

I think you should check your file path,for example "c:\image\imag.img" or maybe make sure opencv imread support file file format:)

Comments

Thank you very much. It works perfectly alright.

hayden (May 24 '13)edit

add a comment

Some problem about displaying a raw image file

2 answers

Comments

Comments

Links

Question Tools

Stats

Related questions

Some problem about displaying a raw image file edit savecancel

2 answers

Comments

Comments

Links

Question Tools

Stats

Related questions

Some problem about displaying a raw image file