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David Tarkowski

Last seen: 2 months ago Active since 2011

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Answered
This Images are effected by which noises?
That image looks like you are returning your image in the YCbCr color space but treating it as an RGB image. See http://www.math...

9 years ago | 0

Answered
Trouble with videoinput and dcam device
You are using a Logitech camera which is a webcam. The |dcam| adaptor does not support webcams. If you are using the |videoinput...

9 years ago | 1

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Answered
How do you access both camera sensors of the Bumblebee2 camera?
I haven't used the BumbleBee2, but the BumbleBee camera would return the data from both sensors as a single image. If each senso...

9 years ago | 0

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Answered
Why does MATLAB crash when I use the Image Acquisition Toolbox?
The first thing that I would check is that you are using the correct version of the Point Grey FlyCapture software. I believe th...

10 years ago | 0

Answered
How can I adjust the contrast of a live video?
There isn't really a good way to get around this. What happens when you set the contrast while the preview is running is that th...

10 years ago | 0

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Answered
Video Object wont get accepted
The second argument to the |getdata| command should be a single number, not a vector. You set the |FramesPerTrigger| property to...

10 years ago | 1

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Answered
Can I use the Image Acquisition Toolbox to write to disk with two video sources and two output files at the same time?
If I understand your question properly, the problem doesn't seem to be with the disk logging, but with starting the acquisition....

10 years ago | 0

Answered
How to increase image quality when taking images through Image Acquisition Toolbox beyond available options in Hardware Browser?
The Logitech c920 has a 2304x1536 pixel sensor, so this is the maximum video resolution available using that camera. The larger ...

11 years ago | 0

Answered
What is the difference between videoinput and imaq.VideoDevice?
The object returned by |imaq.VideoDevice| is a <http://www.mathworks.com/discovery/stream-processing.html System Object> and is ...

11 years ago | 2

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Answered
code for creating a realtime video and storing it at a fixed place using webcam
There is an <http://www.mathworks.com/help/imaq/examples/logging-data-to-disk.html example> in the doc that shows how to do this...

11 years ago | 0

Answered
imwrite through step() to snapshot a video saves red images why?
It looks like you are using a YCbCr format of your camera. When you are previewing or writing to disk, the toolbox converts the ...

11 years ago | 1

Answered
Simultaneous Video Display with continuous serial communication
The big problem that I see is in your startStopCamera_Callback function. You are continuously calling trigger and then getdata i...

11 years ago | 0

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Answered
Disable "Warning: The ROIPosition property was modified by the device."
Although Image Acquisition Toolbox will allow you to specify arbitrary values for the ROIPosition property (within the allowed r...

11 years ago | 1

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Answered
Performing Edge Detection using a Webcam using Image Acquistion and Computer Vision Toolboxes
A VideoDevice object never runs out of data to return since it can always capture another frame. Because of this, there is no is...

11 years ago | 0

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Answered
How can I zoom into preview window while updating
You can change the ROI by setting the ROIPosition property. The IMAQTool GUI will allow you to do this interactively.

11 years ago | 0

Answered
Image Acquisition Camera - High Speed - Fast Capture
Your question is a little vague, but I think that this <http://www.mathworks.com/help/imaq/examples/acquiring-a-single-image-in-...

11 years ago | 0

Answered
Image Acquisition - preview is fast, snapshot is slow?
I think that this example might help with your issue: http://www.mathworks.com/help/imaq/examples/acquiring-a-single-image-in-a-...

11 years ago | 1

Answered
Camera access problem in matlab
Image Acquisition Toolbox does not support these cameras and I can't find any indication that PPT Vision provides MATLAB support...

11 years ago | 0

Answered
imaqtool + firewire camera (dcam driver) = strange artefact (see picture)
It looks like the Scout camera returns multi-byte data in little-endian format. This is somewhat common but the DCAM specificat...

11 years ago | 2

Answered
Recently I use image acquistion toolbox, the image captured is very gloomy
You're trying to display an image in the YCbCr color space (that's what the I420 in your videoinput line means) with a function ...

11 years ago | 0

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Answered
Accessing two identical Logitech Cameras simultaneously ... Matlab freezes (for a while)
I've seen similar issues in the past which were caused by the camera drivers. Probably the simplest thing to do is configure th...

11 years ago | 1

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Answered
imaqregister won't register third party Image Acquisition Toolbox adaptors
You do not need to call IMAQREGISTER on adaptors that the toolbox provides by default. In R2011b, the toolbox shipped with su...

11 years ago | 1

Answered
Image Acquisition Toolbox: using the 'memory' part of 'disk&memory' logging to just record timestamps
You can't do what you want directly, i.e. there is no mode that says just log the time stamps. I would probably use the FramesA...

12 years ago | 0

Answered
Video frame selection
There are a number of ways to this that are roughly equivalent. By default the |GETDATA| command returns |N| frames where |N| i...

12 years ago | 1

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Answered
No video adapters available
Bram, This is an issue that we've recently discovered with Ubuntu 11.04 that we're still investigating. For now, the easiest...

13 years ago | 1

Answered
Image Acquisition reducing CPU-Load
Looking at your code, the following items are likely to be using the bulk of the CPU time in your code: # Conversion from RGB...

13 years ago | 0

Answered
Image acquisition, frame rgb2gray conversion
The rgb2gray function only works on a single image, but you are sending it an array of images. What is the format that you ul...

13 years ago | 1

| accepted

Answered
Problem with image acquisition using a DV converter (Canopus ADVC-55)
The Image Acquisition Toolbox treats DV cameras as live acquisition cameras rather than as VCRs. Basically, whatever is being s...

13 years ago | 0

Answered
imaqregister won't register 3rd party dll
There are a couple of reasons why imaqhwinfo won't load a registered adaptor DLL. The first is that the DLL is not actually loa...

13 years ago | 0

Answered
taking input from two cameras at a same time in Matlab
In general working with two cameras is the same as working with a single camera. You create a |videoinput| object for each devi...

13 years ago | 3

| accepted

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