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External Patterns
For other applications where this image enhancement is not desired, the video processing algorithms can
be bypassed and replaced with a specific set of bit planes. The bit depth of the pattern is then allocated
into the corresponding time slots. Furthermore, an output trigger signal is also synchronized with these
time slots to indicate when the image is displayed. For structured light applications, this mechanism
provides the capability to display a set of patterns and signal a camera to capture these patterns overlaid
on an object.
be bypassed and replaced with a specific set of bit planes. The bit depth of the pattern is then allocated
into the corresponding time slots. Furthermore, an output trigger signal is also synchronized with these
time slots to indicate when the image is displayed. For structured light applications, this mechanism
provides the capability to display a set of patterns and signal a camera to capture these patterns overlaid
on an object.
4.2
External Patterns
Using the mechanism described in the previous section, an external device can feed patterns to the
DLPC300 for display.
DLPC300 for display.
illustrates the bit planes and corresponding output triggers for 3-bit, 6-bit,
and 12-bit RGB.
Figure 4-3. Bit Planes and Triggers
While an external device is writing a frame to the DLPC300, the previous frame is displayed. Therefore,
there is a lag of one video frame in relation to the output trigger signal.
there is a lag of one video frame in relation to the output trigger signal.
shows the allowed pattern combinations in relation to the bit depth of the external pattern.
Table 4-1. Allowable External Pattern Combinations
NUMBER OF
COLOR MODE
PATTERNS
FRAME RATE (Hz)
PATTERN RATE
PER FRAME
1-bit per pixel
24
24 * Frame Rate
2-bit per pixel
12
12 * Frame Rate
3-bit per pixel
8
8 * Frame Rate
4-bit per pixel
6
6 * Frame Rate
Monochrome
5-bit per pixel
4
4 * Frame Rate
6-bit per pixel
4
4 * Frame Rate
7-bit per pixel
3
3 * Frame Rate
15, 30, 45, or 60
8-bit per pixel
2
2 * Frame Rate
1-bit per color pixel
8
4 * Frame Rate
(3-bit per pixel)
2-bit per color pixel
3
3 * Frame Rate
(6-bit per pixel)
RGB
4-bit per color pixel
4
2 * Frame Rate
(12-bit per pixel)
8-bit per color pixel
1
Frame Rate
(24-bit per pixel)
57
DLPU006C – January 2012 – Revised December 2013
Pattern Sequences
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