Thread Subject: NEED CODING???

I need a coding to quantize an image uniformly into 8 levels and another one for resizing it with a bilinear interpolation without using imresize.
Thanks a million.

To quantize an image use imhist function and obtain his histogram.


>>help imhist

An example:

>>img=imread('name_photo.jpg'); % img is a rgb image that you read
>>imshow(img) % display rgb image with imshow
>>img2=rgb2gray(img) % img2 is a gray level image
>>imhist(img2)

To resize an image simply:

>>help imresize

On Sep 29, 8:19 am, "Sprinceana " <mihai...@yahoo.com> wrote:
> To resize an image simply:
> >>help imresize-

Yes, but reread his message - it says "without using imresize" for
some reason.

If your image is 2D:

img = imread('name_photo.jpg') ; % 2d image(grayscale or binary)
size(img)

[c,r ] = size(img); % R?cup?ration des 2 dimensions de l'image

[ci,ri] = meshgrid(1:2:r,1:2:c); % mesh generation for interpolation

img = interp2(img,ci,ri); % interpolation of the pixels values with interp2

size(img)



If your image is 3D: (if your image is rgb use interp3)

img = imread('name_photo2.jpg'); % read 3d image (which is rgb)
size(img)
 
[c,r,p] = size(img); % get the 3 dimensions of image in variables c,r and p

[ci,ri,pi] = meshgrid(1:2:r,1:2:c,1:p); % mesh generation for interpolation

img = interp3(img,ci,ri,pi); % interpolation of pixel values with interp3

size(img)