Peak Detector - Christie Mirage HD User Manual

Section 3: Operation
3-50
Odd Pixel Adjustment
NOTES: 1) Factory-set and rarely required by user. 2) Source must be >90 MHz.
When using certain RGB sources, you may need to adjust the normal gain or offset of
odd pixels in relation to even pixels. This will smooth out very narrow (one-pixel
wide) "checks" or vertical stripes that indicate adjacent "on" and "off" pixels. Using
the Level Detector simplifies this process (see Figure 3.12):
1. Use an external analog native-sized continuous grayscale test pattern with at least
256-levels.
2. Turn "Level Detector" on.
3. Set "Level Value" to ~200. The image should now be black-and-white (or black-
and-one color, if you use "Color Enable" function).
4. Adjust offset. Half of the pixels will move, the other half will not.
5. Adjust until the two transition regions overlap. The stripe of noise will be
minimized, defined by the value in the slide bar.
6. Set "Level Value" to ~800. The image should now be black-and-white.
7. Repeat Steps 4 and 5, but adjusting gain.
8. Repeat Steps 3-7 for all remaining colors. Your RGB source should now be OK.
Two sets of values are automatically saved with these controls—one value for Input
#1, and one for Input #2 (analog). The current set of values depends on which source
is in use. This enables a source to be processed correctly via two different inputs.
Odd Pixel Adjustment
1. Red Odd Pixel Offset
2. Red Odd Pixel Gain
3. Green Odd Pixel Offset
4. Green Odd Pixel Gain
5. Blue Odd Pixel Offset
6. Blue Odd Pixel Gain
7.
8.
9. Auto Color Enable
0.
Figure 3.12. Using "Odd Pixel Adjustment"
NOTES: 1) Adjust offset before gain, since offset affects gain. 2) A value of 128
represents no change in normal odd pixel offset or gain. 3) Odd Pixel Adjustment
eliminates "one pixel on, one pixel off" artifact only, not any type of larger artifacts.
Reserved - No function.

Peak Detector

The "Peak Detector" is a fast method for defining individual input levels, and can
improve the accuracy of input levels set by the Auto Input Level function. Enabling
the "Peak Detector" activates a special operating mode for detecting only pixels that
are considered black or white—all other levels are displayed as a mid-level gray.
When used with a 16-step grayscale pattern in which the two black and white bands
128
145
128
128
116
128
Level Detector
Level Value 200
Color Enable White
Input Levels
Mirage S+/HD, Matrix S+/HD, Christie HD/DS/DW, DLV User's Manual
Set to ~ 200
& adjust Offset.
Set to ~ 800
& adjust Gain.
020-100001-04 Rev. 1 (12/07) - Software v1.6g or higher