OpenCV Examples Part 1

Nov 4, 2008 | Tags: OpenCV | del.icio.us del.icio.us | digg Digg

3. Retrieve Image Properties

At times we need to retrieve the properties of an image like: width, height, number of channels, etc. Listing 2 shows the code snippet to retrieve image properties. The full source code is in imgprop.c.

Listing 2: Retrieve image properties

  1. /* load the image */
  2. IplImage *img = cvLoadImage( argv[1], CV_LOAD_IMAGE_COLOR );
  3.  
  4. /* print some properties */
  5. printf( "Filename:    %s\n",        argv[1] );
  6. printf( "# channels:  %d\n",        img->nChannels );
  7. printf( "Pixel depth: %d bits\n",   img->depth );
  8. printf( "width:       %d pixels\n", img->width );
  9. printf( "height:      %d pixels\n", img->height );
  10. printf( "Image size:  %d bytes\n",  img->imageSize );
  11. printf( "Width step:  %d bytes\n",  img->widthStep );

Consult OpenCV Reference Manuals for details of IplImage data structure.

2. Load an Image 4. Copy an Image

In this page

  1. Introduction
  2. Load an Image
  3. Retrieve Image Properties
  4. Copy an Image
  5. Convert RGB to Grayscale
  6. Access Image Data
  7. Conclusion
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