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how to compute gradients of image using gradient() in matlab2010
As Thorsten says, you should always post the error message. But here's a guess at what might help: im=imread('31.png'); ...

8年以上前 | 0

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To run a function
If you call the function without a result variable, MATLAB assigns the result to the variable |ans|. That is min([3 2 1 5 6...

8年以上前 | 1

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how can i set the pixel intensity values (I) that fall in the range, 200> I >30 to I = 200.
Img(200 > Img & Img > 30) = 200;

9年弱前 | 0

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How do I calculate yearly average value for large data set with uneven time spacing?
If your 2-column matrix is A, try: years = floor(A(:,1)); data = A(:,2); means = accumarray(years, data) ./ accumarra...

9年弱前 | 1

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Is there a simple way to reference months from data in matlab time?
Using the attached function, you can do this: [isplit, ~, meantime] = splitTimes(tm, 'month'); % get start and end point of...

9年弱前 | 1

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assigning to object variables from within-object functions
MATLAB always makes a copy when you assign an object, or pass an object to a function. Here's another example of the same thing,...

9年弱前 | 0

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Why do get error in line 10: Function Keyword is invalid here. This might cause later messages about end.
You can't mix a script and a function in the same m-file. If an m-file contains a function, the first line of code in the file m...

9年弱前 | 2

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how to evaluate a convolution integral by fast fourier transform
Correct zero-padding to use the FFT for 1-D or 2-D convolutions is implemented in my FEX submission <http://uk.mathworks.com/mat...

9年弱前 | 0

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Is there a way to direct an algorithm in edge detection, or correct my drawing outline of the edge?
This is exactly what active contours, or snakes, were originally designed for. If you have the Image Processing Toolbox, have a ...

9年弱前 | 0

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Delete a column from an array of uncertain size?
The trick needed is to use the fact that cell arrays can be expanded into comma-separated lists, so can represent any number of ...

9年弱前 | 1

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how can i save pixel changes in image?
Could be because JPEG compression loses information, so a write followed by a read only returns an approximation to the original...

9年弱前 | 0

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How to arrange stacked Images into a 2 dimension array?
Images2d = reshape( ... permute( ... reshape(Images, 1000, 1000, 8, 5), ... ...

9年弱前 | 0

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Can you use MATLAB for 3D Image Processing?
It may be useful to look at the <http://uk.mathworks.com/products/computer-vision/index.html Computer Vision System Toolbox>, wh...

9年弱前 | 1

質問

parfor warning and analysis of switch statement
I have two functions which are, I think, functionally identical. Both use a |parfor| loop. If the logic within the loop is expre...

9年弱前 | 1 件の回答 | 1

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the rang of unit 8 is 0-255 But im2double convert the range to [0, 1] instead of [0, 255]. please anyone explain it????
It's very helpful to have a standard range of values for images. The convention used in MATLAB toolbox functions is that images ...

9年弱前 | 3

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what are the units of the houghlines 'FilleGap' and 'MinLength' ?
Yes, they are in pixels.

9年弱前 | 0

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[DEPRECATED] What frustrates you about MATLAB?
The |inputParser / validateattributes / validatestring| collection of function parsing and checking tools. * You have to writ...

9年弱前 | 5

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Using knnsearch to find nearest values ignoring NaN's
You need to organise the nearest neighbour search so that it uses both latitude and longitude together, not search each separate...

9年弱前 | 0

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Undefined function 'mtimes' for input arguments of type 'audiorecorder'.
Presumably you replaced data = wavrecord( ... ); by data = audiorecorder( ... ); (I don't know what arguments we...

9年弱前 | 0

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Matrix dimension reduction based on summation
If you try to reduce an 81 x 81 matrix to a 10 x 10 matrix it is bound to be messy, because 81 is not a multiple of 10. You have...

約9年前 | 1

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Multiplying structures together based on field names
A function to multiply two structures field by field. This needs to be copied into a file on your MATLAB path called multiplyStr...

約9年前 | 0

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How to change a range of pixel values in a Grayscale JPEG image?
Like this (where A is the array containing the image): A(A >= 60 & A <= 95) = 255; By the way, that the image is stored ...

約9年前 | 0

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Splitting an array and working on individual sections.
If you want to put the four smaller arrays into separate variables, you can do it like this (assuming the sizes are even as stat...

約9年前 | 0

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Improve efficiency of array multiplication
The value of SW is not used in the code you've shown. If you don't need the value of SW, it will help to omit this line. If you ...

約9年前 | 0

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subtraction ele by ele
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約9年前 | 0

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What is an edge exacty in matlab? is it simply a line ?
I assume you're referring to David Legland's <http://www.mathworks.com/matlabcentral/fileexchange/7844-geom2d toolbox> from the ...

約9年前 | 0

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How can use a for loop to name a matrix?
One way is to use a cell array, like this for trials = 1:max_trials < compute result, assign to a > output_matri...

約9年前 | 0

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Using fileparts and combining with a different file name
The last line should be filenc = [fName '.nc']; What you are doing here is concatenating two strings. Square brackets ca...

約9年前 | 1

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What causes an "Argument to dynamic structure reference must evaluate to a valid field name" error please? code attached.
The dot after |sin| makes it look like a structure rather than a function call. Omit the dot.

約9年前 | 1

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Filling in array with specific numbers
One way, using |repmat| to make the repeated values: % test data A = [1;2;3]; B = [11;12;13;14]; C = [21;22;23]; ...

約9年前 | 4