How to eleiminate the black background and retain the region of interest in my image?

1 次查看（过去 30 天）
Khadeejah
Khadeejah 2011-4-22
Hai,I have an image of the fist which is captured with a black background.The image is an IR (infra red) image captured with a webcamera converted to work in IR .The picture has captured the veins under the skin.What i want to do is just retain the fist and get rid of the surrounding black area.As in my region of interest is just the fist.How do i do this ? I have done something but am just getting a black image for this:
a=imread('1.jpg');
figure;
imshow(a);
b=rgb2gray(a);
figure;
imshow(b);
[j,k]=size(b);
for g=1:j
for f=1:k
if b(j,k)>0.06
c(j,k)=0;
else
c(j,k)=1;
end
end
end
figure,imshow(c);
this is the image: http://lastqueen21.blogspot.com/2011/04/image.html Can somebody please tell me the code for what I want ?? Thank you so much :(

请先登录，再回答此问题。

采纳的回答

Sean de Wolski
Sean de Wolski 2011-4-22
I would do this using my shrinkWrap function:
I = imread('answers421.jpg'); %answers421.jpg is your image
M = shrinkWrap(rgb2gray(I)); %map of hand
IjustHand = bsxfun(@times,uint8(M),I); %apply map to rgb image
imshow(IjustHand) %view
shrinkWrap is available here: FEX shrinkWrap
EDIT to show result:

更多回答（5 个）

Khadeejah
Khadeejah 2011-4-22
<<
a=imread('1.jpg');
figure; imshow(a);
b=rgb2gray(a);
figure; imshow(b);
[j,k]=size(b);
for g=1:j
for f=1:k
if b(j,k)>0.06
c(j,k)=0;
else c(j,k)=1;
end
end
end
figure,imshow(c);
>>
  2 个评论
Sean de Wolski
Sean de Wolski 2011-4-22
<<url_to_a_web_address_with_your_image>>
www.uploadhouse.com is a good free uploading site that allows for direct links.
Khadeejah
Khadeejah 2011-4-22
hai sean ..can u see i ve edited the main question ...bt ill put it here as well :
<<http://lastqueen21.blogspot.com/2011/04/image.html>>

请先登录，再进行评论。

Khadeejah
Khadeejah 2011-4-22
is this right the way I ve put it ?
Khadeejah
Khadeejah 2011-4-23
hai sean ...! :D thnaks for your answer . I have downloaded this m file .Am very new to this ..so after downloading, I extract it and do what ? ASin should i store it in a folder in matlab ? which 1 ?
Khadeejah
Khadeejah 2011-4-23
i downloaded the file and saved it in work folder and did this program that u mentioned. a=imread('1.jpg'); figure(1); imshow(a); b=shrinkWrap(rgb2gray(a)); IjustHand=bsxfun(@times,uint8(M),a); imshow(IjustHand); >
this is the error am getting, : Error in ==> test at 4 b=shrinkWrap(rgb2gray(a));
So what do i do now :( ?
Khadeejah
Khadeejah 2011-4-23
i did the set path and installed the file . And did the code u mentioned This is the error am getting:
??? Error: File: C:\shrinkWrap\shrinkWrap.m Line: 89 Column: 5 Illegal use of reserved keyword "else".
Error in ==> test at 5 c=shrinkWrap(b);
  1 个评论
Sean de Wolski
Sean de Wolski 2011-4-25
What version of ML do you have? Did you change ANYTHING when you downloaded it? It's in working form, to the best of my knowledge, and others have used it so I'm guessing there's something quirky with how you downloaded it.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Get Started with MATLAB 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by