warning when connecting a cam

Pat
2011 10 25
2 个回答
更新时间：2015 8 6
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I get this warning wen connecting a cam
Warning: The BacklightCompensation property was unable to be set to the requestedvalue and has been adjusted. Check the current value before continuing your work.
can u tell why i get this

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回答（2 个）

Jan
Jan 2011-10-25

0 个投票

The message means, that you have tried to set the BacklightCompensatoion to a value, which is not recognized. Without seeing the code, there is no chance to give a meaningful answer.

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Bryan
Bryan 2015-8-6
I've seen something similar, except in my case it was the ColorEnable property. This happens whether I use the imaq tool or do it programmatically. The warning comes up on the command that creates the videoinput object, e.g.:
vid = videoinput('winvideo', 2, 'RGB24_1280x1024');
Since, apart from querying the system as to what videoinput adaptors and formats are available, this is the first real command that does anything, I'm guessing this is a bug in the constructor for the videoinput class. Fortunately, it only throws a warning and not an error, and it's possible to proceed from that point. Is this similar to your experience?

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Image Analyst
Image Analyst 2011-10-25

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Is that in your code? Or is that what the imaqtool tells you? Are you even using imagtool to set your settings? The imaqtool adapter should have sliders to set the various parameters to only "legal" values and so you should never see that message if you used imaqtool. Of course if you did it yourself, you're free to pass any value whatsoever to the "BacklightCompensatoion" property, and it appears that you tried to use a value that is not allowed. For example it wants values in the range 0-300 and you passed in -20 or 569 or 3456. The adapter that imaqtool uses may have been written by your camera manufacturer, not the Mathworks, so you may have to contact them to obtain the legal values, or else check the software development kit documentation for that camera.

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Pat
Pat 2011-10-28
the values are not changed,it works one other system,but in my system i get an error ..why it happens?
Image Analyst
Image Analyst 2011-10-28
That does not seem like an answer to ANY of my questions above.
Image Analyst
Image Analyst 2011-10-28
Pat: Check this out and then come back:
http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer
Pat
Pat 2011-10-28
sir i have read it ,in u r post u said i am using a valur which is not allowed ,if it is the solution ,it sholud not work on any system right,then why it works on one and not on another,i have not changed any values ,
Walter Roberson
Walter Roberson 2011-10-28
You might have different startup scripts in the two systems, or you might have different MATLAB versions, or you might have different Windows versions. Also, is it the exact same camera in both situations, physically moved between the two systems?
Pat
Pat 2011-10-28
walter matlab versions are same,and the camera is same.. moved physically,but i have no idea about startup scripts in two systems,
can u tell what to do...
Image Analyst
Image Analyst 2011-10-28
Pat, look at my questions again - those are the sentences with a question mark after them. I'll repeat them here: "Is that in your code? Or is that what the imaqtool tells you? Are you even using imagtool to set your settings?" Now, did you answer any of them? I can't find anywhere where you mentioned if you were using imaqtool functionality or not. OK, let me try to rephrase this: "Are you running a script, or are you running the imaqtool utility?"

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Pat
Pat
2011-10-25

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Bryan
2015-8-6

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