Teledyne 804A User Manual page 114

804 Series Video Test Generator – User Guide
Table 17-1: Test Patterns
Pattern Name
4. Modify IRE of box to determine threshold.
Command example:
IMGL 3dxtalk
IMGU
3D Cross Talk
Application: This is a 3D pattern used to measure the crosstalk
(extinction ratio) for frame packing, top and bottom and side by
side 3D format structures.
Description: This image is divided in two sections with four rows of
16 white boxes each. The top section is for testing with the left eye
open. The bottom section is for testing with the right eye open.
The background area surrounding the boxes is a series of
grayscale ramps. The ramps begin at 100 IRE and transitions to
50 IRE at the left end of the fourth row of each series.
Method – Calculating percent crosstalk:
1. Close right eye to test the left eye using the top section.
2. Check the visibility of the boxes. Any deviation from
black indicates crosstalk.
3. Assess where the box and its background blend such
that they are not distinguishable.
4. Calculate the degree of crosstalk as a percent by
counting the number of boxes (from the beginning of the
series to the box identified in step 3) and divide that by
127. Example if the 20
the crosstalk would be 20/127 * 100 = 15.7%
5. Repeat with the left eye closed to test the right eye.
Command example:
IMGL 3dxtalk2
IMGU
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box blends with its background,
th
Variant
N/A
Options Range of Values
R

Color
 G
B

C

 M
Y

W

Revision B3