OpenCV: How to visualize a depth image

by

According to the documentation, the function imshow can be used with a variety of image types. It support 16-bit unsigned images, so you can display your image using

cv::Mat map = cv::imread("image", CV_LOAD_IMAGE_ANYCOLOR | CV_LOAD_IMAGE_ANYDEPTH);
cv::imshow("window", map);

In this case, the image value range is mapped from the range [0, 255*256] to the range [0, 255].

If your image only contains values on the low part of this range, you will observe an obscure image. If you want to use the full display range (from black to white), you should adjust the image to cover the expected dynamic range, one way to do it is

double min;
double max;
cv::minMaxIdx(map, &min, &max);
cv::Mat adjMap;
cv::convertScaleAbs(map, adjMap, 255 / max);
cv::imshow("Out", adjMap);

More Related Contents:

  1. opencv library video play [closed]
  2. Transpose a 1D byte-wise array to a 2D array
  3. Extracting text OpenCV
  4. OpenCV with Network Cameras
  5. Convert Mat to Array/Vector in OpenCV
  6. How to efficiently display OpenCV video in Qt?
  7. Get 3D coordinates from 2D image pixel if extrinsic and intrinsic parameters are known
  8. Fill the holes in OpenCV [duplicate]
  9. Blending does not remove seams in OpenCV
  10. connected components in OpenCV
  11. Automatic perspective correction OpenCV
  12. OpenCv 2.3 C – How to isolate object inside image
  13. Square detection doesn’t find squares
  14. How to read files in sequence from a directory in OpenCV?
  15. Convert RGB to Black & White in OpenCV
  16. Easiest way to rotate by 90 degrees an image using OpenCV?
  17. track C++ memory allocations
  18. How to correctly use cv::triangulatePoints()
  19. Converting YUV into BGR or RGB in OpenCV
  20. OpenCV threshold with mask
  21. trying to use imread() and imshow() raises OpenCV Error: Assertion failed (size.width>0 && size.height>0)
  22. Why can’t I open avi video in openCV?
  23. using static libraries instead of dynamic libraries in opencv
  24. Understanding region of interest in openCV 2.4
  25. Image edge smoothing with opencv
  26. Convexity defects C++ OpenCv
  27. Get a single line representation for multiple close by lines clustered together in opencv
  28. OpenCV GTK+2.x error – “Unspecified error (The function is not implemented…)”
  29. FileStorage for OpenCV Python API
  30. Displacement Map Filter in OpenCV

Leave a Comment