how to convolved two image ?

SAM
2013 10 13
4 个回答
回答已采纳
更新时间：2015 11 4
5 次查看（30 天）

0 个投票

hi
i want to convolved 2 images.
i tried with conv2 but its not working.
i have 2 images one is Gaussian filterd image and other is sharped image. and i would like to convolved this 2 image. i write a code
im = imread('my original.jpg');
myfilter = fspecial('gaussian',[3 3], 0.5);
a = imfilter(image, myfilter);
b = imsharpen(image,'Radius',0.5);
c=conv2(a,b);
plz help me

请先登录，再回答此问题。

 采纳的回答

Image Analyst
Image Analyst 2013-10-13
编辑：Image Analyst 2013-10-13

0 个投票

You DON'T want to use image as the name of a variable - it's the name of a built in function. Plus you need to convert to double when you call the convolution.
grayImage = imread('Cameraman.tif');
grayImage = double(grayImage);
subplot(2,3,1);
imshow(grayImage, []);
axis on;
title('Original Image', 'FontSize', 15);
myfilter = fspecial('gaussian',[3 3], 0.5);
subplot(2,3,2);
imshow(myfilter, []);
axis on;
title('myFilter', 'FontSize', 15);
a = imfilter(grayImage, myfilter);
subplot(2,3,3);
imshow(a, []);
axis on;
title('a', 'FontSize', 15);
b = imsharpen(grayImage,'Radius',0.5);
subplot(2,3,4);
imshow(b, []);
axis on;
title('b', 'FontSize', 15);
c=conv2(a,b, 'full');
subplot(2,3,5);
imshow(c, []);
title('c', 'FontSize', 15);
axis on;

9 个评论
显示 7更早的评论 隐藏 7更早的评论

Image Analyst
Image Analyst 2013-10-13
Why do you want to do this anyway - what does it mean? It doesn't make sense to me.
SAM
SAM 2013-10-13
i would like to calculate the blurring effect...
Image Analyst
Image Analyst 2013-10-13
That's what image "a" is. It makes no sense whatsoever to convolve a blurred full sized image with a sharpened full size image. It's basically meaningless.
SAM
SAM 2013-10-13
编辑：SAM 2013-10-13
Undefined function 'conv2' for input arguments of type 'double' and
attributes 'full 3d real'.
again same error...
Error in tryingf11_2 (line 18)
c=conv2(a,b, 'same');
SAM
SAM 2013-10-13
To estimate the blurring effect in a painting,
to model the blurred image I b as the result of Gaussian smoothing filter Gσ applied on a hypothetic sharp image I s ,
i.e. I b =G σ ∗ I s .
The symbol ∗ here means convolution.
Here the parameter σ of Gaussian filter and the sharp image I s are both unknown. Assuming that the frequency distribution for I s is approximately the same, we have the parameter σ of Gaussian filter to represent the degree of blurring. By taking Fourier-Transform on I b , this method looks for the highest frequency whose power is greater than a certain threshold and assumed it inverse-proportioned to the smoothing parameter σ . If the highest frequency is small, it can be considered to be blurred by a largeσ . So the blurring feature is measured as:
Image Analyst
Image Analyst 2013-10-14
Well that's fine, but that's not at all what you are doing.
Anand
Anand 2013-10-14
Looks like your image, is 3D. Is it an RGB image, in that case use rgb2gray to convert it to grayscale:
im = double(rgb2gray(imread('my original.jpg')));
SAM
SAM 2013-10-14
ya i got it
SAM
SAM 2013-10-14
@image analyst
so what should i do?

请先登录，再进行评论。

更多回答（3 个）

Matt J
Matt J 2013-10-13
编辑：Matt J 2013-10-13

0 个投票

You didn't show your error messages, so I'm just guessing, but this
im = imread('my original.jpg');
should probably be this
image = double(imread('my original.jpg'));

2 个评论
显示 无 隐藏 无

SAM
SAM 2013-10-13
Undefined function 'conv2' for input arguments of type 'double' and
attributes 'full 3d real'.
again same error...
Image Analyst
Image Analyst 2013-10-14
They both have to be gray scale images, not color. What does this say:
whos a whos b

请先登录，再进行评论。

Taimoor Zafar
Taimoor Zafar 2015-2-19

0 个投票

I need to convolve two jpg images by using conv2 command but it's not working . Images are attached.
I am new to this field.
Plz help me
Mahfuj
Mahfuj 2015-11-4

0 个投票

The code works fine. But how we can reconstruct two images from the convolved image ?

1 个评论
显示 -1更早的评论 隐藏 -1更早的评论

Image Analyst
Image Analyst 2015-11-4
You'd have to know one of them, and then use an "inverse filter".

请先登录，再进行评论。

类别

在 帮助中心 和 File Exchange 中查找有关 Image Arithmetic 的更多信息

产品

标签

Community Treasure Hunt

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

Start Hunting!

Translated by