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1answer
42 views

Gaussian kernel - How is made?

How do i make a gaussian kernel.. I think i understand the principle of it weighting the center pixel as the means, and those around it according to the $\sigma$ but how would each value be if should ...
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1answer
144 views

Isolate the non blurred part of foucsed image

I have an image taken by a mobile phone camera with focus on a part of it let say a face or whatever. I want to know -approximately- where is the focused area. For example, a bounding box around the ...
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0answers
55 views

Reversing the radial blur effect

From Photoshop documentation: Radial Blur simulates the blur of a zooming or rotating camera to produce a soft blur. Choose Spin to blur along concentric circular lines, and then specify a degree ...
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2answers
4k views

Gaussian Blur In Matlab and Connection to Image Resolution

I am calling fspecial in matlab to create a Guassian blur of an image. For example, ...
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2answers
7k views

Gaussian Blur - standard deviation, radius and kernel size

I've implemented a gaussian blur fragment shader in GLSL. I understand the main concepts behind all of it: convolution, separation of x and y using linearity, multiple passes to increase radius... I ...
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1answer
201 views

Gaussian Blur detection

Let's say you have an original image and a version of the same image that may have been convoluted with a Gaussian blur. How could you demonstrate that the Gaussian blur has been applied and calculate ...
6
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1answer
489 views

Deblurring algorithm to precede thresholding - speed over accuracy

I'm writing an app that recognizes Sudoku puzzles from a camera input. I'd like to remove camera blur from the images to improve recognition. Here is an example image: Since I'm processing a ...
2
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1answer
78 views

Blurring Non-Uniform Areas

I have an image with arbitrary area (the boundary is shown in gray): I would like to blur just the image within boundaries. Ordinary blur causes the background proliferating to image and vice ...
4
votes
1answer
730 views

Degraded image: Wiener Filter vs Wiener deconvolution

I am studying methods for recovering images (that has been blurred and noised). Can someone explain the difference between: http://en.wikipedia.org/wiki/Wiener_deconvolution ...
6
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1answer
422 views

Deconvolution: Richardson-Lucy vs Wiener

I am studying some deconvolution techinques (to remove motion blur) like: Richardson-Lucy Wiener Are there any pros/cons of using one versus another? For example which are the pros/cons of ...
19
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3answers
4k views

How do I remove motion blur?

Is there a generically accepted method of removing motion blur from an image. For a simple case, we can assume that motion happens in a straight line. I assume that it's a two part process composed of ...