Image Acquisition Toolbox - Cannot change Device Properties

I cannot change any device properties, under acquisition parameters, for two webcam's on my bootcamped Windows 7 64bit MATLAB 2013b with the Image Acquisition Toolbox 4.6.

The adaptor I am using is winvideo and the webcams I have tried are the built in Macbook Air Webcam and a Logitech Quickcam Pro 9000.

This is despite being able to change all non-'device properties' related 'acquisition parameters' such as 'general', 'logging', 'triggering', 'region of interest'. It is only all 'Device Properites' which are uneditable / non-configurable.

I have tried changing device properties like 'Backlight Compensation', 'Brightness', 'Contrast', 'Exposure', 'Exposure Mode', 'Frame Rate', 'Auto Focus', 'Gain', 'Saturation', 'Sharpness', 'White Balance', 'White Balance Mode' among others in various orders.

I have tried changing the device properties through scripting (src=getselectedsource(vid) and then set(src,'Property','PropertyValue') - before after and during preview(vid).

I have tried changing the device properties in the Image Acquisition Tool (the GUI) - these options are not grayed out and have other selectable options, whenever I use the sliders etc, the session log produces code which specifies configuring the property to the default value and not to the value I just changed it to. Input1 next to selected source is grayed out but I'm guessing that's because I have only 1 input.

I have tried different drivers, restarting the computer, tried changing properties during preview, acquisition or before starting either, have tried imaqreset. I never get any errors - just the property values don't change. Otherwise all acquisition (and other acquisition parameters) works great.

My guesses at why it is not working are that somehow these device properties are locked by both webcams I have tried. I have tried without any other webcam software (Logitech software, Skype, Gmail) running and straight after a fresh reboot so am not sure what could be causing these device properties to perhaps be read-only (if that is what the problem is). I am not running any special Anti-Virus software or firewall software. Otherwise I'm a bit lost. I read on a forum somewhere a guy was changing these settings with the same webcam I have so very perplexing!

Have read and tried everything in: http://www.mathworks.com.au/help/imaq/configuring-image-acquisition-object-properties.html _and___ http://www.mathworks.com.au/help/imaq/setting-acquisition-parameters-in-the-image-acquisition-tool.html#bq97_8d

Thoughts, comments would be greatly appreciated. Thanks.

Answer 1

[Michael]

I bought a Logitech C920 Webcam, and this has solved this problem - so much have been webcam related.