C++ (Cpp) vpImage::getMinMaxValue Examples

Example #1

File: vpImgproc.cpp Project: npedemon/visp_contrib

/*!
  \ingroup group_imgproc_contrast

  Stretch the contrast of a grayscale image.

  \param I : The grayscale image to stretch the contrast.
*/
void vp::stretchContrast(vpImage<unsigned char> &I) {
  //Find min and max intensity values
  unsigned char min = 255, max = 0;
  I.getMinMaxValue(min, max);

  unsigned char range = max - min;

  //Construct the look-up table
  unsigned char lut[256];
  if(range > 0) {
    for(unsigned int x = min; x <= max; x++) {
      lut[x] = 255 * (x - min) / range;
    }
  } else {
    lut[min] = min;
  }

  I.performLut(lut);
}