SDA 9380 - B21
Preliminary Data Sheet
System description
Peak dark detection (PDD) top border, bottom border, left border, right border:
These four control items define the picture area insides the peak dark detector
is enabled. The peak dark detector is storing the lowest level of the luminance
signal. If this value is higher than the clamping level the luminance signal is
stretched towards clamping level (Black stretch function). Those parts of the
picture with a luminance signal less than 50% of nominal amplitude are get-
ting more dark.
It is possible with these four control items to screen black borders of the pic-
ture (e.g. letter box format) which otherwise prevent the desired function of
black stretch.
The following figure and table show their definitions:
line=0
PDD top
border [7:0]
peak dark detection for
black stretch enabled
PDD bottom
border [7:0]
vertical and horizontal blanking
last line of
field
PDD left
border [3:0]
PDD right
border [3:0]
pixel=0
pixel=863
pixel
PDD
PDD
PDD
PDD
top border
bottom border
left border
right border
Width
Resolution
Range
8 bit (0...255)
2 lines/bit
8 bit (0...255)
4 lines/bit
4 bit (0...15)
16 pixels/bit
4 bit (0...15)
16 pixels/bit
line 0...510
16 (line 32)
line 0...1020
71 (line 284)
pixel 64...304 pixel 576...816
8 (pixel 192) 8 (pixel 704)
Default value
Micronas
5-35
2001-01-29
MICRONAS [ MICRONAS ]
