How to find the "true" perimeter of objects in a binary image?
One possible way is like this: % Example binary image with 3 non-zero pixels img = false(5); % Use zeros(5) if you pref...

etwa 6 Jahre ago | 0

| accepted

Your code is fine, it's just rounding error. Note that the differences are smaller, by many orders of magnitude, than the larges...

etwa 6 Jahre ago | 0

| accepted

Matrix Dimensions Must Agree Error, Error using +
It's necessary to put spaces in the expression for |f| so that |+| and |-| are interpreted as binary operators rather than unary...

etwa 6 Jahre ago | 0

Submitted

Sinkhorn-Knopp algorithm for matrix normalisation
Normalises a matrix so that the row and column sums are all unity

subscripted assignment dimension mismatch
You do not say how |rowspan| and |colspan| are calculated, but the problem is that they do not match the size of |R1| (or the ot...

etwa 6 Jahre ago | 0

Adding constant if the pixel intensity is greater than 50?
Assuming your image is stored in a variable called |img|: highValues = img > 50; img(highValues) = img(highValues) + 200...

etwa 6 Jahre ago | 0

| accepted

How do I get a median filtered image?
If you have the Image Processing Toolbox, you can use <http://uk.mathworks.com/help/images/ref/medfilt2.html medfilt2>.

mehr als 6 Jahre ago | 1

which one is faster? defining a variable as a global variable or as an input of function?
It is usually a bad idea to use global variables. There are many papers, going back over 40 years or more, explaining why. One e...

mehr als 6 Jahre ago | 2

Creating discrete variables within a for loop
I'm not quite sure what you want to do, but it feels like <http://uk.mathworks.com/help/matlab/cell-arrays.html cell arrays> mig...

mehr als 6 Jahre ago | 0

How to run mex files in MATLAB?
I've found <http://uk.mathworks.com/help/matlab/matlab_external/introducing-mex-files.html this documentation> to be very helpfu...

mehr als 6 Jahre ago | 0

rounding problem after decimal point in image processing
If you convert to class uint8 you lose everything after the decimal point. Is that perhaps the problem? If so, don't cast to uin...

mehr als 6 Jahre ago | 0

How to extract 24 binary images from one RGB image which is of 24-bit/pixel color depth?
Try this: % example rgb 24-bit image img = imread('peppers.png'); % Make the binary array array corresponding to ea...

mehr als 6 Jahre ago | 0

Why does translation with imwarp + affine2d-object enlarges the object?
The reason for the enlargement is the interpolation rule that |imwarp| uses - 'linear' by default. Because the image is binary, ...

mehr als 6 Jahre ago | 0

| accepted

Ignoring empty arrays when using arrayfun on a structure?
Try this (not yet tested): west_east = arrayfun(@(d) ~isempty(d.TTA) && 110 >= d.TTA(1) && d.TTA(1) >= 70, data); data =...

mehr als 6 Jahre ago | 0

| accepted

How the following code works in image denoising?
To understand this properly, I think you may need to consult the author of the <http://www.mathworks.com/matlabcentral/fileexcha...

mehr als 6 Jahre ago | 0

| accepted

How can I convert back correctly a 2D matrix to 3D one?
First, the resulting array *will* be the same as the original. Here's a demonstration (making the arrays rather smaller to avoid...

mehr als 6 Jahre ago | 0

Saving structures from each iteration into a structure? Good idea? How?
Not sure what you've tried already and had problems with, but I'd have thought it was as simple as putting the results into stru...

mehr als 6 Jahre ago | 0

How to compare the intensity of the central pixel with its 8 neighboring pixel in an image? Can anyone help me with its matlab code? Also I have to save my central pixel if its intensity value is greater than other pixels.

mehr als 6 Jahre ago | 0

| accepted

Gaussian and Laplacian Random Variables
You can generate random values from a Gaussian distribution with the |randn| function. This <https://en.wikipedia.org/wiki/Lapla...

mehr als 6 Jahre ago | 0

How to use a while loop with irregular step?
You can do it with a |for| loop very simply: for i = [1,2,3, 5,7,9, 12,15,18] % < process using i > end By the w...

mehr als 6 Jahre ago | 0

Perform conv2 on a batch of images
|convn| does exactly what you describe, given a 3-D array and a 2-D kernel.

mehr als 6 Jahre ago | 1

| accepted

Is it possible to create a histogram with fractional entries for each bin?
If all the samples are positive integers, and the bins are all centred on the positive integers and with unit width, as in the i...

mehr als 6 Jahre ago | 0

| accepted

Can anybody help with persistant errors? (Matlab beginer)
The assignment to |wPtr| in the first line of the function has been commented out. This means that no value has been given to th...

mehr als 6 Jahre ago | 0

| accepted

How to interpolate and leave NaNs if long gaps?
I'd adopt a slightly different approach. I'd quantize the times first to get an array of just the times you want, then interpola...

mehr als 6 Jahre ago | 2

| accepted

Can a function which works well for grayscale images be applied for RGB images also?
In general, yes. You can either apply it to each of the R, G and B planes in turn, and then recombine the results, or you may be...

mehr als 6 Jahre ago | 0

It's just, I think, because we are told near the start of the article: _An important factor is that the sampling intervals ar...

mehr als 6 Jahre ago | 0

| accepted

Gray(scale) image with a colormap - how to turn into double?
This works OK: [imInd, cmap] = imread('10.bmp'); imGrayUint8 = ind2gray(imInd, cmap); imGrayDouble = im2double(imGray...

mehr als 6 Jahre ago | 0

| accepted

accessing indexed values in a 3D array
[rows, cols] = ndgrid(1:size(Z,1), 1:size(Z,2)); Zindex = sub2ind(size(Z), rows, cols, ind); s = Z(Zindex);

mehr als 6 Jahre ago | 2

| accepted