Answered
How to know the detected face is of which frame in a matlab code of face detection and how to save first and last frame.
Use an if statement to check if |bbox| is empty. If it is empty, then no face is detected. If not, then a face is detected.

9 years ago | 0

Answered
Creating, and hence analysing a depth map from two images
Hi Wafi, Please see the <http://www.mathworks.com/help/vision/examples/depth-estimation-from-stereo-video.html following exam...

9 years ago | 0

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feature extraction using Local Line Binary Patterm
|extractLBPFeatures| function was added to the Computer Vision System Toolbox in R2015b release.

9 years ago | 0

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I am getting this error while running a matlab code for face detection and tracking Error in noseDetector = vision.CascadeObjectDetector('Nose', 'UseROI', true);
What is the error message you are seeing? Could it be that there is no face in that video frame?

9 years ago | 0

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How can I incorporate extractHOGFeatures with trainCascadeObjectDetector?
Hi Leonard, You cannot use |extractHOGFeatures| together with |trainCascadeObjectDetector|. However, you can specify the feat...

9 years ago | 0

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Answered
Does Vision.Cascade object detector detect only face ?
Yes, it is possible. You would have to train your own banana detector model using the |trainCascadeObjectDetector| function. Thi...

9 years ago | 0

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Answered
Camera calibration cameraPose Vs extrinsic
It really depends on what exactly you did... To compute the extrinsics you need a picture of a checkerboard. So most of the ...

9 years ago | 0

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How do I find the groundtruth of an image?
Try the <http://www.mathworks.com/help/vision/ug/label-images-for-classification-model-training.html Training Image Labeler app>...

9 years ago | 0

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Answered
extract the difference betwwen 2 images
What you are looking for is background subtraction. It is not really as simple as taking the difference between the two images. ...

9 years ago | 0

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Answered
Tracking single object using computer vision system toolbox
Hi, can you please tell us which version of MATLAB, and what kind of operating system you are using? In the mean time, try r...

9 years ago | 0

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HOW to combine between SURF features and HOG features
Hi Ahmed, It would help if you could tell us more about what you are trying to do. The |extractHOGFeatures| function in t...

9 years ago | 0

Answered
3D reconstruction of points from three views - is there a 3 camera alternative to triangulate?
The |triangulate| function can only handle two views. However, the algorithm that it uses can be easily extended to multiple vie...

9 years ago | 3

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Answered
Nine DOF pinhole camera calibration using Computer Vision Toolbox?
I don't think |estimateCameraParameters| is suitable for this. It implements the <http://research.microsoft.com/en-us/um/people/...

9 years ago | 2

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Answered
Cascade Object Detector: Unable to generate a sufficient number of negative samples
Hi Leonard, Negative images are images that do not contain the objects that you are trying to detect. They should, however, c...

9 years ago | 1

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Answered
Motion detection using kalman filter- my code is not running after a frame. Help me in fixing it. code i have taken from matlab. but i changed the video only. here is my code...
You may want to try |vision.KalmanFilter| object that comes with the Computer Vision System Toolbox. See <http://www.mathworks....

9 years ago | 0

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Face Detection bad accuracy
There are several options in the |vision.CascadeObjectDetector| that you can tweak. If you know how large you expect the faces t...

9 years ago | 1

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Answered
how can i apply(vision.ForegroundDetector to obtain a foreground model at each input frame of video?
The |step()| method of |vision.ForegroundDetector| takes the video frame and returns the foreground mask, which is a binary imag...

9 years ago | 0

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What kind of images should I use to train a haarcascade classifier for sad mouth detection to reduce memory use?
Do you have OpenCV installed on your computer? This may be the cause of your error. The Computer Vision System Toolbox ships wit...

9 years ago | 0

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Answered
error is : Subscripted assignment dimension mismatch.
You may be getting this error because there may be different numbers of images in each imageSet. The easiest thing to do here is...

9 years ago | 0

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Answered
How to use trained SVM classifier with vision.ObjectDetector?
You can certainly <http://www.mathworks.com/help/vision/examples/digit-classification-using-hog-features.html train your own HOG...

9 years ago | 0

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Answered
matlab video player which matlab compiler supports?
Try |vision.DeployableVideoPlayer|.

9 years ago | 1

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how to verify / correct Not enough input arguments with undistortImage MATLAB2015b
Hi Zachary, It would help if you can post the code for the function that you give to the Image Batch Processor, and a mat fil...

9 years ago | 0

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how can i track a set of pixels using kalman filter?
There is a |vision.KalmanFilter| object in the Computer Vision System Toolbox. Take a look at the <http://www.mathworks.com/hel...

9 years ago | 1

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Answered
How do I make shear corrections to an image?
You need some points from your image, and their corresponding "ideal" locations. Then you can compute the transformation using |...

9 years ago | 1

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How to delete a column of an array?
You do not have just an array of points. You have one |pointCloud| object, which contains an array of x,y,z coordinates in the |...

9 years ago | 0

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Is there a substitute for pcshow()?
In R2015a the equivalent function is called |showPointCloud|.

9 years ago | 2

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how to get started with training image labeler?
Hi Shahad, If you use the Training Image Labeler app, once you are done labeling the objects, you have to click the "Export R...

9 years ago | 0

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Multi-cameras on same coordinate system
Yes, you can use the Computer Vision System Toolbox for this. First, you have to calibrate each of your cameras individually, u...

9 years ago | 0

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Finding coordinates of same point in two different images
Hi Navya, Please take a look at <http://www.mathworks.com/help/vision/examples/find-image-rotation-and-scale-using-automated-...

9 years ago | 0

Answered
How to crop an image A which is a subset of an image B
If you have matched the points, then you can simply find the bounding box of the matched points: points = round(matchedTarg...

9 years ago | 0

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