I refer Vybrid RM of Rev6 of chapter61.
There are describe on VIU adjustment rang and method.
EX, there are describe on Brightness adjustment range
I can understand how to adjust the adjustment range because it was listed as the following Brightness.
<This is equivalent to brightness. Accepts a signed value from -128 to +127 (0x80 to 0x7f).>
But 61.6.18 Hue(VDEC_HUE) .There are no description of the adjustment range and the adjustment method.
Would you Please teach me adjustment range and method.
And 61.6.16 Contrast (VDEC_CNTR)
The adjustment range are listed, But the adjustment range and adjustment method does not understand.
Hello,
I add some comments about this questions.
Video decoder on Vybrid supports adjustment of "contrast" , "brightness" and "hue". Each parameters are controlled by VDEC_CNTR, VDEC_BRT and VDEC_HUE, respectively.
Then, our questions are configuration range of these registers;
Q1. contrast (VDEC_CNTR)
RM explains that "This is equivalent to contrast. The pivot point is 0. Other contrast gains use a pivot point of mid luma. Nominal gain of 1 is 0x80." I understand 0x80 is gain 1 and I guess this register accept unsigned value from 0 to 255 (0x00 to 0xFF).
Is it correct ?
Q2. hue (VDEC_HUE)
RM explains that "Hue". It is difficult to understand adjustment range. Does this register also accept signed value from -128 to +127 (0x80 to 0x7F). or unsigned value from 0 to 255 (0x00 to 0xFF) ?
If signed value, 0x80 is gain 1 (No change) as same as contrast ?
Best Regards
Taku