How to find the dimensions of a specific area in an existing image?

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Alexander West
Alexander West 2019-4-9
评论： Alexander West 2019-4-9
Say I'm given an image with a rectangular space made entirely of green pixels. I want to find the dimension of that area that is made entirely of green pixels.
This is what I have so far:
numGreenPixels=img(:,:,1)==0 & img(:,:,2)==255 & img(:,:,3)==0
numGreenPixels = sum(numGreenPixels(:));
this would only given me the total number of green pixels, when I need to find the dimension of said space. How do I go about this?
  2 个评论
KSSV
KSSV 2019-4-9
when I need to find the dimension of said space.
YOu can find the dimensions if you can arrange the data into a matrix form......is your green region a square/ rectangle? If it is taking some other irregular shape, how you will specify the dimensions?

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回答（1 个）

KSSV
KSSV 2019-4-9
编辑：KSSV 2019-4-9
In that case......the length of unique of x,y should give you the dimensions. You have numGreenPixels as a matrix of 0 and 1's.
[y,x] = find(numGreenPixels) ;
If it is not clear attach your image.
  1 个评论
Alexander West
Alexander West 2019-4-9
function refrigerator(fridge,picNeed)
img=imread(picNeed)
background=imread(fridge);
r=(img(:,:,1))
g=(img(:,:,2))
b=(img(:,:,3))
numGreenPixels=img(:,:,1)==0 & img(:,:,2)==255 & img(:,:,3)==0
[y,x] = find(numGreenPixels) ;
background=imresize(background,[x,y])
[w,r] = strtok(fridge,'.')
newFile= ['decorated_' w r]
imwrite(img,newFile)
end
Doing this returns an error with the resize function? Logically, it should work right?

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