FS450, FS451
PRELIMINARY PRODUCT DESCRIPTION
JUNE, 2000, VERSION 1.2
32
COPYRIGHT
©
© 1999, 2000 FOCUS ENHANCEMENTS, INC.
PRELIMINARY INFORM ATION
6.2.12 SHP, FLK - Sharpness and Flicker Filter
Sharpness Low (24)
7
6
5
4
3
2
1
0
0
0
0
SHP4
SHP3
SHP2
SHP1
SHP0
Sharpness High (25)
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
Reg
Bit#
Bit Name
Description
24
4-0
SHP4-0
Flicker Filter Sharpness [4-0]. SHP accentuates the joint high
vertical - high horizontal frequencies to sharpen edges. SHP is an
unsigned number.
Range: {0 : 31} Provides 0 to 31/16 (6 dB) joint high horizontal and vertical frequency boost.
Flicker Filter Coefficient Low (26)
7
6
5
4
3
2
1
0
0
0
0
FLK4
FLK3
FLK2
FLK1
FLK0
Flicker Filter Coefficient Low (27)
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
Reg
Bit#
Bit Name
Description
26
4-0
FLK4-0
Flicker Filter Coefficient [4:0]. Provides weighting factor for 3
line flicker filter. FLK is an unsigned number.
Range: {0 : 23}
Notes:
The FS450 Flicker Filter is more complex than a Three Line Average (TLA) flicker filter. The FS450 flicker filter
includes a variable vertical filter response in addition to a sharpness function. Adjusting the FLK Coefficient
modifies the vertical filter from no filtering (FLK = 0) to a Three Line Average (FLK = 16), giving the user the best
choice in filtering options.
In addition to the variable vertical settings, the FS450 flicker filter has a sharpness function. This function is a two
dimensional peaking function which accentuates the joint high vertical - high horizontal spatial frequencies (an
"edge enhancer"). The three line variable two dimensional flicker filter is formed by summing the unit impulse
function with a vertical flicker function scaled by FLK (Flicker Coefficient) and the peaking function which is scaled
by SHP (Sharpness Coefficient). The FLK and SHP variables have 5 bits of resolutions, with a usable a range
from 0 to 16/16 for FLK, and 0 to 31/16 for SHP.
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