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Error message in Intensity-Based Automatic Image Registration
|imregister| expects the 2-D images to be in grayscale. It does not use color information as part of the registration. If you...

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Why does bwperim give wrong perimeter?
The circle you are trying to measure is not a perfect circle, so technically you can't use |2*pi*radius| as the formula for peri...

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Problem on "assignDetectionsToTracks",thank you!
You need to upgrade to R2012b or higher. |assignDetectionsToTracks| was introduced in R2012b.

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Writing a program to detect motion in a still video.
If you have the Computer Vision System Toolbox, you can use the |vision.ForegroundDetector| object. <http://www.mathworks.com...

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Features to be considered in classifying currency images?
use google: <http://www.ijcsit.com/docs/Volume%204/Vol4Issue1/ijcsit2013040129.pdf>

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Methods for object detection during sudden illumination change..
Go through the documentation links on this page: <http://www.mathworks.com/help/vision/object-detection.html> There are ex...

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How can I read huge amount of image files and take the corresponding histogram data to a matrix in order?
If you have the parallel computing toolbox, you could try something like this: allHists = zeros(256,numel(file)); parpoo...

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in "fun" have access to the center values of the "colfilt" kernels?
You're going to have to store the linear index of where you expect the pixel to be and access that element of the array passed i...

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How to find out discontinuous edges?
For |'canny'|, have you tried changing the sensitivity thresholds or the standard deviation? The standard deviation allows you t...

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How to train a group of images Using SVM classifier ?
I don't know anything about the code you're using, but if you would like to use an SVM classifier, look at this <http://www.m...

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How to detect eyes and mouth on a single image in MATLAB?
%Read the input image I = imread('extract1.png'); %To detect Mouth MouthDetect = vision.CascadeObjectDetector('M...

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How can I get median filtered background image from sequence of video frames? I am trying to store the corresponding pixels values of sequence of frames in respective cells and then to find the median value, but I cannot get values in cells.
Why is |E| a cell array and why are you using |cellfun|? Try using the <http://www.mathworks.com/help/images/ref/medfilt2.ht...

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Clustering performance and validation
Try this for DB Index: <http://www.mathworks.com/help/stats/clustering.evaluation.daviesbouldinevaluationclass.html Davies-Boul...

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errors in using RESHAPE FUNCTION......PLEASE HELP ME.
b = imresize(a,[128 128]); z = b(:);

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Help with image thresholding?
Try working in the HSV space. Here's what I got I = imread('http://www.mathworks.com/matlabcentral/answers/uploaded_files/...

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Sobel Operator no threshold
[Gx,Gy] = imgradientxy(im,'sobel');

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RGB to opponent color space code
From what I can tell, this should do it: %load RGB image im = im2double(imread('peppers.png')); %extract each chann...

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How to find the center point of the object?
Look at the |'Centroid'| property of the <http://www.mathworks.com/help/images/ref/regionprops.html regionprops> function.

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HELP, How to do real time face tracking in matlab?
You can use |imaqhwinfo| to see which cameras are connected to your machine and then accordingly use the |videoinput| command to...

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how can I make this code faster on the GPU?
There is no operation in the above code that can take advantage of the GPU. All you are doing is looping over every 4th pixel se...

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How can I detect and recognize road traffic signs ?? using matlab
Here's a couple of links to examples that might help: <http://www.mathworks.com/help/vision/examples/traffic-warning-sign-rec...

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gpuArray takes more time than CPU - imrotate
A couple of questions in helping you answer the question: 1. Which graphics card do you have? GPU performance is highly depen...

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how ot code gui scrollbar ?
Use the <http://www.mathworks.com/help/matlab/ref/uicontrol.html uicontrol> function with |'slider'| as the first input. Look at...

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kindly mention the standard testing technique for face recognition system???
The question is unclear and the description is unrelated to the question. You have compressed images, but want to test a facial ...

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kmeans Segmentation Clarification for color images
Your cluster centers are not in the XY co-ordinate space. They are in the AB color space. So |cluster_center| does not refer to ...

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How can i remove the black color from inside the white curve boundary
Use |imfill| with the |'holes'| option. % read the image im = imread('http://www.mathworks.com/matlabcentral/answe...

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how to divide the image into overlapping blocks?
You could use the <http://www.mathworks.com/help/images/ref/blockproc.html blockproc> function. You would need to specify a |'Bo...

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less connected pixels should be removed from image
Your definition of 'less connected' is not clear to me. However, if you want just the big round component, you can use |regionpr...

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how to form a gaussian pyramid from a image
Use <http://www.mathworks.com/help/images/ref/impyramid.html impyramid>.

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