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Setting⑫: White Correction - Mitsubishi Electric KD Series User Manual

Contact image sensor, web surface inspection
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5-2 Setting⑫: White Correction
※When operating Dark/White correction, input external sync. signal continuously, or conduct with internal sync. mode.
※Turn on the Dark Correction for carrying out the White Correction.
Address
Register name
7070h WhiteCorrectionEnable
7074h WhiteTarget_R
7078h WhiteTarget_G
707Ch WhiteTarget_B
7080h WhiteCorrectionExecute
7084h WhiteCorrectionExtraTriger R/W
5-2-14 White correction
[Funcion]
This function is to correct variation of output from sensor IC
pixel by pixel caused by variation of illumination strength
and Pixel sensitivities . It makes all output of pixels uniform.
Refer chapter 2-3. , "how to use CIS" .
Image data when scanning white reference Object
Image data when scanning white reference Object
DVp0(n): output of n-th Pixel
Pixel
data output after White correction
data output after White correction
White target
data output after White correction
pixel
TM-XJ959A
R/W
Parameter
Data
Set white Correction On/Off
R/W
0 or 1
0:OFF /1:ON
R/W
0 to 4095 Set red color's White Correction Target value
R/W
0 to 4095 Set green color's White Correction Target value
R/W
0 to 4095 Set blue color's White Correction Target value
R/W
1
Generate White Correction data (Normal Trigger mode)
Generate White Correction data (External Trigger mode)
0 or 1
0:END / 1:START
There are two types of procedures to generate White correction data as
follows.
1)
White correction data generation sequence is started up by executing
"WhiteCorrection Execute". The White correction data (average of 32 lines of
pixel data) is save on the product.
2)
White correction data generation sequence is started up by providing a start
command at "WhiteCorrectionExtraTrigger". The White correction data
(maximum values of the average of 32 lines of pixel data until the end
command is provided to CIS) are saved on this product.
"WhiteTarget_R,G,B" is a register to set a target value of the output of after
White Correction when CIS scans a white chart. The target value is based on
12 bit depths.
[Remark]
1)
2)
3)
4)
Function
Normal Trigger mode: WhiteCorrectionExecute
External Trigger mode: WhiteCorrectionExtraTriger
At factory setting, CIS has an initial white correction data for only 600dpi .
To prepare new White correction data , start to send command after
turning on dark correction function under scanning white reference object
having uniform reflection ratio .
Scanning Image has some unusual strips possibility by using incorrect
white correction data caused by scanning scratches , dirt and dusts on
white reference object when re-generate white correction data .
This product has memory for saving correction data every resolution as
same as dark correction. The white correction data which is applied for
CIS is automatically changed when resolution is changed.
Initial
0
4000
4000
4000
-
0
79
© Mitsubishi Electric Corporation

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