Effacer les filtres
Effacer les filtres

Help with image thresholding?

5 vues (au cours des 30 derniers jours)
Shravanthi le 3 Mar 2014
Commenté : Shravanthi le 4 Mar 2014
I need to get a binary image of the fist (shown below).
I've tried using graythresh to get the threshold value, tried my own threshold values, used imgradient to get the edges and even used edge detection, but I can't seem to get a clear outline of the fist.
I'm using blob analysis for detecting the fist.
Can someone help me out? Really appreciate it!

Réponses (1)

Anand le 3 Mar 2014
Try working in the HSV space. Here's what I got
I = imread('http://www.mathworks.com/matlabcentral/answers/uploaded_files/8923/gest2_7.jpg');
% Convert to HSV
I = rgb2hsv(I);
% Threshold based on hue
mask = I(:,:,1)>=0.023 & I(:,:,1)<=0.082;
% Cleanup mask
You'll need to play around with the thresholds some more and do some post-processing on the mask like filling holes and smoothing the boundaries.
  5 commentaires
Image Analyst
Image Analyst le 3 Mar 2014
Can you get better illumination of the background, so that you don't have such a severe gradient?
Shravanthi le 4 Mar 2014
This was the best lighting we could get in the room where we have to show the project. The background is black cardboard. Is there something else I can do?

Connectez-vous pour commenter.


En savoir plus sur Image Processing Toolbox dans Help Center et File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by