Why isn't matlab drawing the bounding box on my picture?

4 次查看(过去 30 天)
I followed these commands in tutorial exactly how he did it to draw a bounding box around the main object of a pic but nothing happened for me. The picture looks the same. Will these commands work or not depending on the picture you are using?
>> walk = imread('walkstraight/frame0062.tif');
>> gray_walk = rgb2gray(walk)
>> bw_walk = im2bw(gray_walk, 0.8);
>> bw = ~bw_walk;
>> bw = bwareaopen(bw, 1000);
>> [bwLabel, num] = bwlabel(bw, 8);
>> s = regionprops(bwLabel, 'BoundingBox');
>> imshow(walk);
>> hold on;
>> rectangle('Position', s.BoundingBox)
>> hold off;

回答(2 个)

TADA
TADA 2021-9-5
Without your image its hard to tell, but I tried your code on a couple matlab builtin images and it seems to work.
if you get an error, you may have more than one bounding box returned from regionprops, then you can use a loop to plot all rectangles
imshow(walk);
hold on;
for i = 1:numel(s)
rectangle('Position', s(i).BoundingBox)
end
hold off;
if you don't get an error, but just can't see the rectangle, it may be actually drawn around the entire image. It might happen if the contrast isn't high enough.
in that case, you can try lowering the cutoff intensity you use for im2bw.
  5 个评论
TADA
TADA 2021-9-5
Maybe it's not necessary, it was copied from the loop above
Andrew Killian
Andrew Killian 2021-9-5
Ok so it works but it's drawing the bounding box around the border/frame of the whole entire image, and not the object of the human walking in the middle of the image.

请先登录,再进行评论。


Image Analyst
Image Analyst 2021-9-5
Is the main object the largest one? If so, instead of
bw = bwareaopen(bw, 1000);
do this:
bw = bwareafilt(bw, 1); % Take largest blob only.
Attach your image if you reply to either one of us. And tell us where to find the tutorial you're following.
  4 个评论
Andrew Killian
Andrew Killian 2021-9-5
It doesn't let me attach .tif files. I converted it to .jpg - Idk if it will work the same though.

请先登录,再进行评论。

类别

Help CenterFile Exchange 中查找有关 Images 的更多信息

Community Treasure Hunt

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

Start Hunting!

Translated by