# David Young

### University of Sussex and University of Southampton

Last seen: más de 1 año hace Con actividad desde 2009

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Professional Interests: Image Processing

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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...

alrededor de 8 años hace | 2

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Image to Image correlation (moving window) function colfilt
You are likely to find <http://uk.mathworks.com/help/images/ref/normxcorr2.html normxcorr2> more suitable that |colfilt| for thi...

alrededor de 8 años hace | 0

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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...

alrededor de 8 años hace | 0

Affine optic flow
Estimates the parameters of an affine (first-order) optic flow model from two images.

más de 8 años hace | 6 descargas |

Hough transform for circles
A Hough transform function for detecting circles, optimised to allow search over radii.

más de 8 años hace | 17 descargas |

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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.

más de 8 años hace | 1

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Finding columns that contain both integers and NaN
Yes, |isnan(x)| does what |x == NaN| would do if NaNs were equal to each other.

más de 8 años hace | 0

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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...

más de 8 años hace | 1

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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 ...

más de 8 años hace | 0

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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...

más de 8 años hace | 0

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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))))

más de 8 años hace | 0

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ICA image analysis steps
There's an ICA package on the <http://uk.mathworks.com/matlabcentral/fileexchange/38300-pca-and-ica-package file exchange> and a...

más de 8 años hace | 0

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What does step instruction in matlab do?
It is documented: see <http://uk.mathworks.com/help/vision/ref/vision.videofilereader.step.html this>. Note that you have to loo...

más de 8 años hace | 0

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Is fftn() and ifftn() equivalent to a 3D Fourier Transform in this case?
|fftn(X)| and |ifftn(X)| carry out a 3-D FFT or a 3-D inverse FFT if |length(size(X))| is equal to 3.

más de 8 años hace | 0

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How to smoothen cropped image?
If you have the Image Processing Toolbox, you could use <http://uk.mathworks.com/help/images/ref/imgaussfilt.html imgaussfilt>.

más de 8 años hace | 0

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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, <http://users.s...

más de 8 años hace | 0

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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...

más de 8 años hace | 0

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please give me a detailed description of sift transform in matlab coding and how they works
The <https://en.wikipedia.org/wiki/Scale-invariant_feature_transform Wikipedia article> is a good starting point. It has referen...

más de 8 años hace | 0

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NEED A GAUSS FILTER CODING USING IMAGE PROCESSING with some Examples
If you have the Image Processing Toolbox, use <http://uk.mathworks.com/help/images/ref/imgaussfilt.html imgaussfilt>.

más de 8 años hace | 0

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How to deform an image
Yes, it's <http://uk.mathworks.com/help/images/ref/imwarp.html imwarp>. You'll probably also want <http://uk.mathworks.com/help/...

más de 8 años hace | 2

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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, '...

más de 8 años hace | 0

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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...

más de 8 años hace | 5

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How can I repeat the following text 5000 times and 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; ...

más de 8 años hace | 0

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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. ...

más de 8 años hace | 0

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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...

más de 8 años hace | 0

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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...

más de 8 años hace | 1

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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...

más de 8 años hace | 0

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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...

más de 8 años hace | 0

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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...

más de 8 años hace | 1

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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 ...

más de 8 años hace | 0