AK8859VN Datasheet, PDF (36/72 Pages) Asahi Kasei Microsystems – NTSC/PAL/SECAM Digital Video Decoder

[AK8859VN]
[7.30.] Image quality adjustment
Image quality adjustments consist of contrast, brightness, color saturation, and hue adjustment.
[7.30.1.] Contrast adjustment
Setting for contrast adjustment inclination
Register
Definition
[CONTSEL-bit =[0]*]
YOUT = (CONT / 64) x ( YIN - 128) +128
Sub Address: 0x0D [6:0]
CONT0
~
CONT6
[CONTSEL-bit =[1]*]
YOUT = (CONT / 64) X YIN
YOUT: Contrast obtained by the calculation
YIN: Contrast before the calculation
CONT: Contrast gain factor (register setting value)
The gain factor can be set in the range {0~ (127 / 64)} in 1/64 step.
Default setting value is 0x40.
As the register setting shown in the above table, contrast adjustment inclination can be selected between
50% and 0%.
Setting for contrast adjustment inclination
Register
Definition
CONTSEL
[0]: 50%
[1]: 0%
Sub Address: 0x0C [6]
[7.30.2.] Brightness adjustment
Setting for brightness adjustment
Name Definition
YOUT = YIN + ( BR x 2 )
Sub Address: 0x0E [6:0]
YOUT: Brightness obtained by the calculation
BR0
YIN: Brightness before the calculation
~
BR6
BR: Brightness gain factor (register setting value)
The gain factor can be set in the range {-128 ~ 126} in step of 2.
The setting is in 2’s complement.
MS1179-E-00
AKM Confidential
- 36 -
2010/04