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Regionprops returns NaN as centroid value for a Label
The regionprops function tries searching for the component with label 16, which you seem to have filtered out. So, this componen...

12 years ago | 0

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How to convert binary image to 2D triangulation?
Try using bwperim and delaunay. Something like this: BW = bwperim(im); [x,y] = find(BW); tri = delaunay(x,y); Hope...

12 years ago | 0

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xlswrite without losing precision
You should not be seeing that. I tried the following and the Excel cell shows me the full value: >> x x = ...

12 years ago | 0

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How do I obtain a composite of two grayscale images?
Have you tried this: [C,RC] = imfuse(A,RA,B,RB,'blend');

12 years ago | 0

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comparison of two histograms using pdist2
You almost got it right. Just transpose the histograms. So you're last command should be d = pdist2(c1',c2');

12 years ago | 3

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Answered
how to count number of cars,bikes in an image using matlab
Here's an approach you could try: 1. Use the <http://www.mathworks.com/help/vision/ref/traincascadeobjectdetector.html trainC...

12 years ago | 0

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how otsu multithresh works?
Look at the paper referenced in the documentation page for multithresh. The link is below: <http://ieeexplore.ieee.org/stamp/...

12 years ago | 1

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What do the output vectors in optical flow technique of live motion detection indicate?
V and H are the vertical and horizontal components of optic flow. They represent the horizontal and vertical components of motio...

12 years ago | 0

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Answered
How to get the 4 pts for mouth in face parts detection????
img = imread('f5.jpg'); mouthDetector = vision.CascadeObjectDetector('Mouth'); bbox = step(mouthDetector,I);

12 years ago | 0

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how to get the facial feature points from the faces???
You can feed the bounding box of the detected face to any one of the feature detectors in the Computer Vision System Toolbox: <h...

12 years ago | 0

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can blkproc function is used in LBP?
You can use the <http://www.mathworks.com/help/images/ref/nlfilter.html nlfilter> function to implement this. It will be slow, t...

12 years ago | 0

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Answered
feature extraction using Local Line Binary Patterm
From what I can tell of the reference you provided, it should be easy enough to use an existing implementation of local binary p...

12 years ago | 0

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Answered
Manual Feature Extraction For Image Mosaicking/Panaroma
I wouldn't move to manual feature extraction so soon. I don't know enough to comment on whether that is a good option. Have ...

12 years ago | 0

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How to match features
After having detected SURF feature descriptors from both images, you should call the <http://www.mathworks.com/help/releases/R20...

12 years ago | 0

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Answered
How to obtain the translation and rotation from the given affine transformation matrix
Affine transformations involve a rotation, translation, scale and shear. It may not be possible to recover only the translation/...

12 years ago | 1

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Answered
Reshape array for 256 by 256 matrix showing 16 by 256
This is what you should do for an image with 65536 pixels that you want to make square: nelem = numel(A); side = sqrt...

12 years ago | 0

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how to calculate translation and rotation of points of image from 2 consecutive frames
Given that you have already determined SURF features in both frames, you can use the <http://www.mathworks.com/help/vision/ref/m...

12 years ago | 0

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Matlab is making small errors during computations
You haven't given much information, but that's just floating point precision for you. There's tonnes of articles describing this...

12 years ago | 0

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How to detect larger corners in an image?
I'd suggest trying to play around with the 'FilterCoefficients' and 'QualityLevel' parameters. Increasing the kernel width an...

12 years ago | 0

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playing card extraction and identification
Look at the second demo from the following File Exchange submission: <http://www.mathworks.com/matlabcentral/fileexchange/356...

12 years ago | 0

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conversion of pixel values in a gray scale image
im(im==0) = 255;

12 years ago | 0

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How to identify object inside an image and find its position in that image
I think this blog post by Steve Eddins should be directly relevant to what you're trying to achieve: <http://blogs.mathworks....

12 years ago | 0

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how to track two objects from a given video?
Try using some of the techniques described here: <http://www.mathworks.com/help/vision/gs/object-detection-and-tracking.html#bt...

12 years ago | 0

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need code which created 'stopSigns.mat'
You don't really need a mat file. You need ground truth data for training. So, you need a set of images with bottles in them and...

12 years ago | 1

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how to find distance between 2 points of a image
Use the <http://www.mathworks.com/help/images/ref/imdistline.html imdistline> function.

12 years ago | 0

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how to define coordinate of SURF Points?
The SURFPoints object contains a data member called Location, which contains the co-ordinate of the point. For example, in th...

12 years ago | 1

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Colorbar is to large in colormapeditor when using imshow
Dominic, I don't think this is a bug. The image command gives a 64x3 colormap, whereas the imshow command gives a 256x3 colorma...

12 years ago | 0

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Answered
Selecting important features from a very large pool
If you have the latest release of the Computer Vision System Toolbox, there's a way to train a classifier using the Viola-Jones ...

12 years ago | 0

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Shape Based Image Retrieval
Are you talking about this paper? "Content Based Image Retrieval Using Color, Texture and Shape Features", Hiremath, Pujari ...

12 years ago | 0

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Help me with matlab code for lane detection and object detection in relation to vehicle.
Have a look at this: <http://www.mathworks.com/products/computer-vision/examples.html?file=/products/demos/shipping/vision/vi...

12 years ago | 0