Is there a way to threshold the background out of the image, to leave only the object?

조회 수: 5(최근 30일)
Hi folks,
I have images that look like the following, and I'm trying to threshold out the background. For some images, this is a very straightforward endeavour. For others, however, it's not that easy because the background and object have similar greyscale levels.
Ultimately, I want to use regionprops() to measure the object's properties.
May I please ask if there's a way to get around this?
My images look like this:

채택된 답변

Image Analyst
Image Analyst 2021년 8월 4일
편집: Image Analyst 2021년 8월 4일
Try imbinarize(). Then check the mean gray level in the center of the mask image and compare it to the mean gray level at the top of the image. If the mask is dark in the center and bright around the top, then invert the mask. Something like (untested)
mask = imbinarize(grayImage);
[rows, columns] = size(mask);
row = round([rows/2-50 : rows/2+50]);
col = round([columns/2-50 : columns/2+50]);
if mean2(mask(1:10)) > mean2(mask(row, col))
% Mask at top is white and in middle is black. Need to invert it.
mask = ~mask;
  댓글 수: 5

댓글을 달려면 로그인하십시오.

추가 답변(0개)

Community Treasure Hunt

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

Start Hunting!

Translated by