OpenCV: How to visualize a depth image

Question

I am using a dataset in which it has images where each pixel is a 16 bit unsigned int storing the depth value of that pixel in mm. I am trying to visualize this as a greysca

Answer 1

Adding to samg' answer, you can expand even more the range of your displayed image.

double min;
double max;
cv::minMaxIdx(map, &min, &max);
cv::Mat adjMap;
// expand your range to 0..255. Similar to histEq();
map.convertTo(adjMap,CV_8UC1, 255 / (max-min), -min); 

// this is great. It converts your grayscale image into a tone-mapped one, 
// much more pleasing for the eye
// function is found in contrib module, so include contrib.hpp 
// and link accordingly
cv::Mat falseColorsMap;
applyColorMap(adjMap, falseColorsMap, cv::COLORMAP_AUTUMN);

cv::imshow("Out", falseColorsMap);

The result should be something like the one below