David Young
University of Sussex and University of Southampton
Professional Interests: Image Processing
Statistics
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Content Feed
How can I overlap two images/pictures in Matlab?
You can use |hold| to superimpose contour lines on an image. Here's an example: % Get an image from a jpg file img = imr...
6 years ago | 2
Image to Image correlation (moving window) function colfilt
You are likely to find
6 years ago | 0
create a sliding window to determine when a % of numbers in a sequence equal a certain value.
The answer to problems involving a sliding window is very often to use the convolution operation, as here. % some random t...
6 years ago | 0
Submitted
Affine optic flow
Estimates the parameters of an affine (first-order) optic flow model from two images.
6 years ago | 7 downloads |
Submitted
Hough transform for circles
A Hough transform function for detecting circles, optimised to allow search over radii.
6 years ago | 24 downloads |
How do I connect plot points with lines using ginput?
The attached function should show you how to do what you need, though you will have to modify it for your purpose.
6 years ago | 1
|accepted
Finding columns that contain both integers and NaN
Yes, |isnan(x)| does what |x == NaN| would do if NaNs were equal to each other.
6 years ago | 0
How do I use the ismember function (if possible) to locate the min/max GMT time elements within a cell array?
The problem is that you are passing |ismember| a cell array containing numbers, but it can handle cell arrays only if all they c...
6 years ago | 1
|accepted
Creating Gibbs Ringing by changing tissue intensity
I guess you haven't had an answer yet because "Gibbs Ringing" is quite a technical and specialised area. However, the substance ...
6 years ago | 0
Save ginput values under a for loop
Just replace [B,A]=ginput; with [B(index), A(index)] = ginput; to store each pair of inputs in array elements. I...
6 years ago | 0
How can I use plus operation with more than 2 array
Either use A + B + C + D + Z or plus(A, plus(B, plus(C, plus(D, Z))))
6 years ago | 0
What does step instruction in matlab do?
It is documented: see
6 years ago | 0
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Is fftn() and ifftn() equivalent to a 3D Fourier Transform in this case?
| fftn (X) |和| ifftn (X) |进行三维FFT或3-D inverse FFT if |length(size(X))| is equal to 3.
6 years ago | 0
|accepted
How to smoothen cropped image?
If you have the Image Processing Toolbox, you could use
6 years ago | 0
ellispse detection for cornea edges
General purpose ellipse detection may not be the best solution to this problem - if you haven't already seen it,
6 years ago | 0
What is the difference in these two methods of finding coordinates of image?
The results of |find| are |[row, column]|. The results of |ginput| are |[column, row]|. That is, |find| uses the matrix conve...
6 years ago | 0
|accepted
please give me a detailed description of sift transform in matlab coding and how they works
The
6 years ago | 0
NEED A GAUSS FILTER CODING USING IMAGE PROCESSING with some Examples
If you have the Image Processing Toolbox, use
6 years ago | 0
|accepted
how to colored the edge detection result(binary image)?
You can set the colour map when you display the binary image. For example img = imread('pout.tif'); imedge = edge(img, '...
6 years ago | 0
command or code for detecting zero crossing points in a signal
You can use logical tests to find the indices between which the signal changes sign. Then you need to interpolate if you want to...
6 years ago | 3
我怎么能重复下面的文本和5000倍save the solutions for the 5000 different betas in a 1x 5000 matrix ?
betas = zeros(1, 5000); % make array to store results for k = 1:5000 % ... your code ... betas(k) = beta; ...
6 years ago | 0
how to make global variable in matlab so that we can use in any .m file or any other method to use a variable in many .m files
If the m-files are scripts, they share the same top-level workspace and you can access the same variables from both of them. ...
6 years ago | 0
How to calculate phase angle between two sine wave from vectors
If you know the frequency, it is probably more accurate to fit a sine wave to each of the two vectors than to use the FFT. The p...
6 years ago | 0
How do reshape cell array row to new vectors?
First, there's an error to correct. |Big_RIR_AVG(1)| is not a 59x1 double. It's a scalar cell containing a 59x1 double. This mig...
6 years ago | 1
|accepted
Enable/Disable uitabs in uitabgroup, with v2015b
A quick thought - how about using the SelectionChangedFcn callback of the uitabgroup object, to select another tab when one of t...
6 years ago | 0
Shortest path that passes through certain nodes
If you search online for "travelling salesman problem matlab" you will find discussion and code that will help with this problem...
6 years ago | 0
|accepted
How can I add a digit to a pre-existing number randomly ?
To take a random sample from a vector, just use *randi* - no need for *randsample*. Example: numbers = [2, 3, 9, 7]; ran...
6 years ago | 1
Help using accumarray on a 3d-matrix
I think it's simpler to use *mean* directly and avoid *accumarray*. So to get all the rainfall for 1999, for example, you could ...
6 years ago | 0
|accepted
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