Answered
Problem with rectify StereoImages
The error you are getting indicates a problem with calibration. |rectifyStereoImages| cannot compute the size of the rectified ...

8 years ago | 0

Answered
Stereo Calibration and Scene Reconstruction
Hi Idan, You should make a large checkerboard and try to take images at various distances. I doubt you can make a checkerboa...

8 years ago | 1

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Answered
What image file type does stereo calibration expect?
Stereo Camera Calibrator app takes still images. It will take any image format that |imread| can handle. It is best, however, to...

8 years ago | 0

Answered
How to do Rectification for Stereo Vision?
Please see the <http://www.mathworks.com/help/vision/ref/rectifystereoimages.html rectifyStereoImages> function in the Computer ...

8 years ago | 0

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Answered
Stereo matching and disparity map accuracy issue
Hi Victor, When you moved the cameras to the new mount, did the "baseline" (distance between the cameras) change? Did the dis...

8 years ago | 2

Answered
Camera Calibration with dot chart
Currently there is no function in MATLAB analogous to findCirclesGrid() for detecting a pattern of circles. However, if you can...

8 years ago | 0

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Answered
camera calibration
Please try the <http://www.mathworks.com/help/vision/ug/stereo-camera-calibrator-app.html Stereo Camera Calibrator app> in the C...

8 years ago | 0

Answered
real time image processing using matlab and stereo camera
Use the |getsnapshot| method of |videoinput| to acquire the frame.

8 years ago | 0

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I have some problem with the insertObjectAnnotation function in Matlab. How do your change the orientation of annotation?
Hi Chen, Unfortunately this is not possible at present. |insertText| and |insertObjectAnnotation| do not let you rotate the t...

8 years ago | 0

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Is there any way to get the pixel to distance ratio from the single camera calibrator app?
Unfortunately, by calibrating the camera you can only calculate the focal length in pixels. If you need the focal length in worl...

8 years ago | 0

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What is the matlab code for the function assignDetectionsToTracks for calculating assignments, unassignedTracks, unassignedDetections from cost?
|assignDetectionsToTracks| is available in the Computer Vision System Toolbox, in the R2012b release or later.

8 years ago | 0

Answered
Determination of stereo camera world coordinates with respect to calibration target
Matt's is almost correct. The extrinsics R and t represent the transformation from the world coordinates into camera's coordinat...

8 years ago | 1

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Answered
Operands to the || and && operators must be convertible to logical scalar values
Hi Antariksha, The warning you are getting may indicate a corrupt image file. By the way, when you capture your calibration i...

8 years ago | 0

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Answered
Finding area from the bounding box created by vision.blobAnalysis
Hi Akira, Yes, of course. blob = vision.BlobAnalysis('BoundingBoxOutputPort', true,'MinimumBlobAreaSource', 'Property','...

8 years ago | 1

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Answered
Detecting and Tracking Moving Objects
Hi Ashmil, There are <http://www.mathworks.com/help/vision/ug/multiple-object-tracking.html many different ways> to detect an...

8 years ago | 0

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size error for my own image in "Automatically Detect and Recognize Text in Natural Images" code
Hi Sara, That is a warning, not an error. |imshow| is issuing this warning whenever it has to re-size the image to fit on the...

8 years ago | 1

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freground detection by GMM in matlab
In general, you can use morphological operations, such as |imopen| to remove noise, and |imclose| to fill in small gaps. In ...

8 years ago | 0

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I am getting the error - Undefined function 'showPointCloud' for input arguments of type 'uint8' . How can this error be removed?
You should be able to use |scatter3| instead of |showPointCloud|.

8 years ago | 0

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How to change properties of pointer tracker without re-initializing tracking?
Hi Hana, The properties of |vision.PointTracker| are non-tunable, which means you cannot change them after you call the |step...

8 years ago | 1

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Problem with rectifying images from a calibrated stereo-pair system
Hi Kevin, I don't think you have a problem here. A disparity of ~80 pixels for an object 120cm away from the cameras is very ...

8 years ago | 0

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Answered
Aligning 3D stereo co-ordinate system along local vertical and local horizontal
Hi Meghana, Please keep in mind that in the camera-based coordinates the X-Y plane is the image plane, which is inside the c...

8 years ago | 0

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Answered
rectifyStereoImages doesn't work. Why???
Hi Einav, Can you please post your images and the stereo parameters? Off hand, I would say you could use more calibration im...

8 years ago | 0

Answered
How to get the camera parameters of the rectified images provided by rectifyStereoImages(I1,I2, stereoParams) ?
Hi Lucien, Currently, the parameters of the rectified images are not exposed. Could you tell me a bit more about what you are...

9 years ago | 0

Answered
I have a task of counting cement bags moving on a conveyor belt and displaying the count. Is it possible to count the bags by processing a recorded video of the process?
Hi Sankara, Is your camera stationary? If so, then take a look at <http://www.mathworks.com/help/vision/examples/motion-base...

9 years ago | 0

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How to find similar or identical images into two directories?
If you are looking for identical images, then you can simply read each pair of images and check for element-wise equality. Other...

9 years ago | 0

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Answered
Sources of error to calculate X, Y Z distances using stereo when disparity map seems alright.
Hi Meghana, I am glad that you have been able to get a good reconstruction. Regarding the distance, keep in mind that the ori...

9 years ago | 0

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Answered
how can I draw a rectangle on a image?
Hi Biza, Try using the |insertShape| function in the Computer Vision System Toolbox.

9 years ago | 0

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is the calibration parameters differs when the distance between camera and check board pattern varies?
Hi Ram, Could you please clarify which camera parameters you are talking about? Intrinsic camera parameters (optical center a...

9 years ago | 0

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Answered
Face Detection In Video
There is an example showing how to <http://www.mathworks.com/matlabcentral/fileexchange/47105-detect-and-track-multiple-faces de...

9 years ago | 0

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