Answered
Counting of Lights
Sure, but exactly how you do it depends on many factors which you haven't stated in your question. Without that information, ...

14 years ago | 0

Answered
to find length of edges
Guessing a little, but I suspect that the following functions will be sufficient: * sum * bwlabel * regionprops

14 years ago | 0

Answered
How can I make a specific color of an image transparent?
There may be a way that allows you to overlay the images using graphics operations, but here's an alternative way that does it b...

14 years ago | 3

Answered
How to find the cost for implementing an fft
I guess you mean the cost involved in _executing_ an fft. (The cost involved in _implementing_ an fft would the amount you'd nee...

14 years ago | 0

| accepted

Answered
struct array
for i=1:4 Data.(Name{i}) = Temp{1,i}; end

14 years ago | 0

Answered
8-bit plane slicing for an image
You should be able to simply use bitget, as in im = imread('pout.tif'); bit1 = bitget(im, 1); % lsb for example ims...

14 years ago | 2

| accepted

Answered
How to get the coordinate of this four points?
Here's another approach which works with the clean image you've given us. It's not as neat as <http://www.mathworks.co.uk/matlab...

14 years ago | 2

| accepted

Answered
array dimensions equivalence check?
One alternative: isequal(size(A), size(B)) || (isvector(A) && isvector(B) && numel(A) == numel(B))

14 years ago | 6

| accepted

Answered
error: Subscripted assignment dimension mismatch
The problem is that the length of the output vector depends on the time delay. Each time df is called, it produces a vector of a...

14 years ago | 1

| accepted

Answered
To split a matrix into equal parts.
If your original matrix is m, then provided its size is even on each dimension, you can divide it into four equal pieces like th...

14 years ago | 1

Answered
How to calculate with sigma notation in matlab?
If you need a numerical result, the sigma notation turns into a call to the sum() function. Your example might look something li...

14 years ago | 0

Answered
change the angle of fourier transform and see the new image
You need to combine the angle and the amplitude to get a single complex array before inverse transforming. Try imshow(ifft2...

14 years ago | 1

Answered
how to segment the grey level image by using watershed algorithm
There is sample code in the demo "Marker-controlled watershed segmentation" in the Image Processing Toolbox, if you have it.

14 years ago | 0

Answered
what is ground truth image? how to create it in matlab??
"Ground truth" means a set of measurements that is known to be much more accurate than measurements from the system you are test...

14 years ago | 4

| accepted

Answered
read a radiology image series ( DICOM ) on MATLAB platform
MATLAB has an <http://www.mathworks.co.uk/products/image/index.html Image Processing Toolbox> which has many tools for image pro...

14 years ago | 1

| accepted

Answered
how can i blur an image by removing high frequencies of it's DFT
There's a demo that does this <http://www.mathworks.co.uk/matlabcentral/fileexchange/28810-fourier-transform-demonstration here>...

14 years ago | 0

| accepted

Answered
Deriving PDF from a given signal without using the hist() function?
The pdf function is not useful for this. It generates the theoretical PDF for a named distribution, but does not estimate an emp...

14 years ago | 1

Answered
Real cepstrum in loop
Your receps function returns a vector with 240 elements, and you are trying to assign these to a single element of tab. The erro...

14 years ago | 0

Answered
Spatial Frequency
From <http://www.mathworks.co.uk/matlabcentral/fileexchange/28810-fourier-transform-demonstration this demo>: The Fourier com...

14 years ago | 0

Answered
Counting the pixels within a circle detected in an image
How standard are your images? Could you choose the circle whose radius and centre coordinates are within expected ranges? If yo...

14 years ago | 1

| accepted

Answered
Edge Detectors
Canny.

14 years ago | 0

Answered
Detecting circles in an image
You could try *normxcorr2*. There's example code in the accepted answer to <http://www.mathworks.co.uk/matlabcentral/answers/244...

14 years ago | 0

Answered
what is Frequency in a image
<http://www.mathworks.co.uk/matlabcentral/fileexchange/28810-fourier-transform-demonstration Another tutorial>

14 years ago | 1

Answered
Pupil Detection using Hough Transform
It's hard to help when you don't say what you have tried so far. The HT contributions on the file exchange should work - have yo...

14 years ago | 0

| accepted

Answered
Image processing using indexing
The details depend on what class your images are, but here's an example that you can probably modify as needed. % test data -...

14 years ago | 0

| accepted

Answered
Using Optical Flow to warp an image
Given a vector for every pixel, you can use interp2 to do the warping and to handle the non-integer lookup. Suppose that vx repr...

14 years ago | 4

Answered
matrix ifft tranform
m = [1 1 -1 1 % data matrix 1 1 1 1 -1 -1 -1 1 1 -1 -1 -1 1 -1 -1 -1 -1 -1 1 1 1 1...

14 years ago | 0

| accepted

Answered
electromagnetism
To distinguish blurred and sharp images, you could use a standard measure of blur, such as <http://stefan.winklerbros.net/Public...

14 years ago | 0

Answered
vectors from array
vector = array(:, column_number)

14 years ago | 0

| accepted

Answered
Cut an image based on pixel size
You can cut the blob up using morphological operations, as shown below. A point on terminology: all pixels are the same size ...

14 years ago | 0

| accepted