chromasens allPIXA pro, Руководство пользователя

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Chromasens CD40127_R02 allPIXA_pro_User Manual.docx 168
9.6 Brightness and contrast
These parameters describe the digital offset and gaining parameters for the camera. This
operation takes place in step (3) of the digital image processing pipeline (
section 4.5.1; Figure
17: Digital process of the allPIXA pro camera (block diagram) ).
NOTE
Using these parameters to adjust image brightness in a wide range to get
brighter images may degrade image quality.
First, use the analog gaining to adjust brightness of the image (see sections
9.2.1 and 9.2.2). For instance, after adjusting analog gain and performing a
shading correction (it sets the values for white to 255), you can get the white
slightly out of the area of the image saturation from 255 to 245.
The internal processing is not limited up to 255@8bit. This means that after
the shading correction it is possible to additionally process higher values
such as 300, which can be taken without loss into the visible area by using
the brightness and contrast control afterward.
9.6.1 Use brightness and contrast
Name
Name
Use brightness and contrast
Function Enables the digital gaining and contrast function in the camera.
Channels All
Unit Bool
Dependency
None
Notes
Camera: Value: Function:
Lower limit all 0 Off
Upper limit
all 1 On
9.6.2 Brightness
Name
Name Brightness
Function Digital offset
Channels
Red; Green; Blue
Unit
Integer
Linear
Dependency
Only available if the Use Brightness and Contrast check box has been
selected.
Notes
This value refers to 10-bit image data, in output image there are usually 8-
bit image data. This results in a relative range of -
0,25…+0,25.
Camera: Value: Output image:
Lower limit all -255 -64
Upper limit all 255 64