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DLP LightCrafter Development Platform Forum
Maximum Internal Pattern Rate
I am new to lightcrafter, in the user’s guide there is an equationregarding to internal pattern rate, where it said Pattern Rate = (1/PatternExposure Period) + (Bit Plane Load Time) + (Buffer Rotate Overhead),I find this equation quite wrong, because on the right hand side, I believe theunit is in Hz, but the left hand side is Hz plus time. Currently I want to achieve2880 fps of bit plain structured light patterns, with typical bit plane loadtime = 230µs and buffer rotate overhead = 135µs, if the equation above wasindeed “Pattern Rate = 1/(Pattern Exposure Period + Bit Plane Load Time + BufferRotate Overhead)” the maximum pattern rate I can get is 1/(250 + 230 + 135)us =1626Hz, this is quite contradictory to Table 3-2 in the user guide of 4000Hz, monochrome,1 bit per pixel, 96patterns. Can someone tell me where I am wrong?
The 4000Hz can be achieved only on the following conditions.
For 1 bit patterns the Bit Plane Load time and Exposure period can be overlapped, provided you set the exposure time to 0
If the number of patterns are within 24 then the Buffer Rotate overhead does not come into account.
Bit Depth = 1
Number of Patterns <= 24
Exposure Time = 0
Period = 250
Regarding your first question about the equation, yes, there is a typo in the usage of braces.
The correct equation is:
Pattern Rate = 1/((Exposure Time) + (Bit Plane Load Time) +( Buffer Rotate Overhead))
Thank you very much Sureshkumar, I didn’t expectedanyone would give me a reply this fast!
See this posting for a little more information. We are reviewing an update on the DLPC300 SW Programmer's Guide that explains how to program the DLPC300 for these speeds. We will post it as soon as we complete our review.
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