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Activities/Turtle Art/Using Turtle Art Sensors (view source)
Revision as of 21:38, 7 March 2011
, 21:38, 7 March 2011→Brightness
===Brightness===
===Brightness===
The average brightness of the image is calculated. As at V106, the automatic gain control (AGC) is still functioning. The camera tries to correct the image brightness to a standard brightness, then calculates the average brightness. The result is a non linear relationship between actual and the measured brightness. Also, some parts of the image are brighter than others further complicating things. Using a diffuser, e.g. translucent material like a plastic bag, may help.
The average brightness of the image is calculated by the 'brightness' block [[File:Brightblock.jpg]]. As at V106, the automatic gain control (AGC) is still functioning. The camera tries to correct the image brightness to a standard brightness, then calculates the average brightness. The result is a non linear relationship between actual and the measured brightness. Also, some parts of the image are brighter than others further complicating things. Using a diffuser, e.g. translucent material like a plastic bag, may help.
[[File:Brightness.jpg]]
[[File:Brightness.jpg]]