Erm... What?
What matters to us is that in 1982 NASA was using a 3D video motion capture system using two R6502 microprocessors.
NASA: FUNCTIONAL VIDEO-BASED ANTHROPOMETRIC MEASURING SYSTEM
NASA: FUNCTIONAL VIDEO-BASED ANTHROPOMETRIC MEASURING SYSTEM
Last edited by tokafondo on Fri Jun 10, 2022 8:41 am, edited 1 time in total.
Re: A FUNCTIONAL VIDEO-BASED ANTHROPOMETRIC MEASURING SYSTEM
Very interesting... just to record some points from the document:
- authors J H Nixon and J P Cater of SwRI (Southwest Research Institute, San Antonio, Texas)
- 28 May 1982
- third generation of such experimental systems in a series for NASA
- recording limb position (range of movement, dexterity) of a human subject in a spacesuit
- subject is decorated with LEDs controlled by an off the shelf system
- retrieving data from the off the shelf system ("Selspot") which controls up to 30 LEDs and records position with 4 cameras
- off the shelf system has a digital interface
- those cameras have a full-frame infrared detector and some analogue means of measuring the 2D position of the single spot on the detector, digitised as a pair of 10 bit numbers
- 300 samples per second, approx
- the positional error is about 1 inch, on the scale of a human subject
- recording and replaying binary data from videotape, at four bytes per used line, a 1 Mbit/sec rate
- variable number of lines used per frame
- remainder of frame is conventional video of the experimental subject
- data is packetised with a one byte checksum
- off the shelf (Panasonic VHS) VCR, solenoid controlled, digital interface to "remote control cable"
- written in 6502 assembly code, listings also submitted and possibly on file
- two R6502 subsystems, at 1MHz and 2MHz respectively, for central control and for VCR data transfer
- two 1k buffers, single port, flipping between the two systems for moving data between them
- AMD9511 for floating point support
- each data frame recorded with a frame counter, dropped frames reported as an error to the user
- machine code monitor on a serial line interface
- GPIB/IEEE 488 bus interface for data export, in first instance connected to an HP 9825 desktop
- user interface has a VDU output driven by a TMS 9918 chip with 16kB of DRAM
- some difficulty reconciling the "frame rate" of the position sensor system with the VCR's frame rate.
- initially hoped to store 3x to 4x the data on the VCR
Perhaps see also
- authors J H Nixon and J P Cater of SwRI (Southwest Research Institute, San Antonio, Texas)
- 28 May 1982
- third generation of such experimental systems in a series for NASA
- recording limb position (range of movement, dexterity) of a human subject in a spacesuit
- subject is decorated with LEDs controlled by an off the shelf system
- retrieving data from the off the shelf system ("Selspot") which controls up to 30 LEDs and records position with 4 cameras
- off the shelf system has a digital interface
- those cameras have a full-frame infrared detector and some analogue means of measuring the 2D position of the single spot on the detector, digitised as a pair of 10 bit numbers
- 300 samples per second, approx
- the positional error is about 1 inch, on the scale of a human subject
- recording and replaying binary data from videotape, at four bytes per used line, a 1 Mbit/sec rate
- variable number of lines used per frame
- remainder of frame is conventional video of the experimental subject
- data is packetised with a one byte checksum
- off the shelf (Panasonic VHS) VCR, solenoid controlled, digital interface to "remote control cable"
- written in 6502 assembly code, listings also submitted and possibly on file
- two R6502 subsystems, at 1MHz and 2MHz respectively, for central control and for VCR data transfer
- two 1k buffers, single port, flipping between the two systems for moving data between them
- AMD9511 for floating point support
- each data frame recorded with a frame counter, dropped frames reported as an error to the user
- machine code monitor on a serial line interface
- GPIB/IEEE 488 bus interface for data export, in first instance connected to an HP 9825 desktop
- user interface has a VDU output driven by a TMS 9918 chip with 16kB of DRAM
- some difficulty reconciling the "frame rate" of the position sensor system with the VCR's frame rate.
- initially hoped to store 3x to 4x the data on the VCR
Perhaps see also
Quote:
A source code listing for the software in the VRA is given in Document No DRD No. OM-123T, " Software Listings for a Video-based Anthropometric Measuring System".
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Re: NASA: FUNCTIONAL VIDEO-BASED ANTHROPOMETRIC MEASURING SY
BigEd on Fri 10 Jun 2022 wrote:
some analogue means of measuring the 2D position of the single spot