How can i slip and rotate a color image?

2 vues (au cours des 30 derniers jours)
Carole
Carole le 28 Nov 2012
Hi,how can i slip and rotate the color image img like the binary image bw?
I=imread('image.jpg'); %color image
bw=segmentation(I); % the result is a binary image where the object detected (ROI) is white
img = bsxfun(@times, I, cast(bw,class(I)));
phy = regionprops(bw, 'Orientation')
[barx,bary]=barycentre(edge);
% slip the region to the center of the image
edge = recentre(edge,barx,bary);
I2 = recentre(bw,barx,bary);
phy1=phy.Orientation;
edge=imrotate(edge,-phy,'loose');
I3=imrotate(I2,-phy,'loose');
thanks
  4 commentaires
Carole
Carole le 28 Nov 2012
The function recenter and imrotate work with the binary image bw where the ROI is centred and rotated very well but when i want to center and rotate the ROI of the color image img it doesn't work :( . I couldn't use imtransform to center the region and rotate the image with a given angle -phy
yagnesh
yagnesh le 29 Nov 2012
use imrotate after separating rgb planes and after that combine those 3 planes

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Réponse acceptée

Image Analyst
Image Analyst le 29 Nov 2012
Have you tried circshift() to slide the image over?
  7 commentaires
Carole
Carole le 1 Déc 2012
thanks it works with some modifications knowing that I want to move the centroid of the object to the center of the image
Image Analyst
Image Analyst le 1 Déc 2012
OK great. Go ahead and mark it as "Answered" then.

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Plus de réponses (1)

Sean de Wolski
Sean de Wolski le 28 Nov 2012
imrotate can rotate color images just fine:
imshow(imrotate(imread('peppers.png'),42,'crop'))
  2 commentaires
Carole
Carole le 29 Nov 2012
It seems that the problem is in the function recentre because it works with the binary image bw but it doesn't work with the color image img
I=imread('image.jpg'); %color image
bw=segmentation(I); % the result is a binary image where the object detected (ROI) is white
img = bsxfun(@times, I, cast(bw,class(I)));
edge2 = edge(bw, 'prewitt');
edge2 = 1 - edge2;
[barx,bary]=barycentre(edge2);
edge2 = recentre(edge2,barx,bary);
I2 = recentre(bw,barx,bary);
I3 = recentre(img,barx,bary);
The function
function im_trans=recentre(image,barx,bary)
[X,Y]=size(image);
tx=floor(X/2)-barx;
ty=floor(Y/2)-bary;
im_trans = zeros(X, Y);
if tx>=0
if ty>=0
for i=1 : X-tx
for j=1 : Y-ty
im_trans(i+tx, j+ty) = image(i, j);
end
end
elseif ty<0
for i=1 : X-tx
for j=abs(ty)+1 : Y
im_trans(i+tx, j+ty) = image(i, j);
end
end
end
elseif tx<0
if ty>=0
for i=abs(tx)+1 : X
for j=1 : Y-ty
im_trans(i+tx, j+ty) = image(i, j);
end
end
elseif ty<0
for i=abs(tx)+1 : X
for j=abs(ty)+1 : Y
im_trans(i+tx, j+ty) = image(i, j);
end
end
end
end
can you help me to correct it please
Image Analyst
Image Analyst le 30 Nov 2012

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