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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...

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...

約4年 前 | 0

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Please help me to convert opencv matrix multiplication into matlab

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

Please help me to convert opencv matrix multiplication into matlab

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

約4年 前 | 0

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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...

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...

約4年 前 | 0

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Sinkhorn-Knopp algorithm for matrix normalisation

Normalises a matrix so that the row and column sums are all unity

4年以上 前 | ダウンロード 1 件 |

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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...

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...

4年以上 前 | 0

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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...

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...

4年以上 前 | 0

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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>.

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>.

4年以上 前 | 1

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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...

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...

4年以上 前 | 2

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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...

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...

4年以上 前 | 0

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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...

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...

4年以上 前 | 0

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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...

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...

4年以上 前 | 0

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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...

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...

4年以上 前 | 0

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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, ...

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, ...

4年以上 前 | 0

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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 =...

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 =...

4年以上 前 | 0

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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...

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...

4年以上 前 | 0

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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...

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...

4年以上 前 | 0

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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...

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...

4年以上 前 | 0

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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.

Some of the answers <http://uk.mathworks.com/matlabcentral/newsreader/view_thread/266606 here> should help.

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.

Some of the answers <http://uk.mathworks.com/matlabcentral/newsreader/view_thread/266606 here> should help.

4年以上 前 | 0

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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...

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...

4年以上 前 | 0

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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...

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...

4年以上 前 | 0

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Perform conv2 on a batch of images

|convn| does exactly what you describe, given a 3-D array and a 2-D kernel.

Perform conv2 on a batch of images

|convn| does exactly what you describe, given a 3-D array and a 2-D kernel.

4年以上 前 | 1

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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...

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...

4年以上 前 | 0

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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...

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...

4年以上 前 | 0

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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...

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...

4年以上 前 | 2

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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...

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...

4年以上 前 | 0

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Question about the image resampling

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

Question about the image resampling

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

4年以上 前 | 0

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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...

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...

4年以上 前 | 0

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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);

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);

4年以上 前 | 1

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How can I use 'impixelinfo' function?

Perhaps you don't have the Image Processing Toolbox (IPT), or perhaps you have a very old version (before R14). Give the command...

How can I use 'impixelinfo' function?

Perhaps you don't have the Image Processing Toolbox (IPT), or perhaps you have a very old version (before R14). Give the command...

4年以上 前 | 0

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How can I assign a value to a variable in the first iteration of a loop and for the rest of iterations the variable's value should be the outcome of the script?

Make y an argument to your function, and also remove unnecessary code: function y = fcn(v, u, y) y = y+(u-v); end ...

How can I assign a value to a variable in the first iteration of a loop and for the rest of iterations the variable's value should be the outcome of the script?

Make y an argument to your function, and also remove unnecessary code: function y = fcn(v, u, y) y = y+(u-v); end ...

4年以上 前 | 1