Imagery Requirements
From TeamFrednetWiki
Extracted from our exponsor Elphel summary GLXP requirements and created by Tobiokanobi
Some requirements specified by the X PRIZE Foundation are not very exact (e.g. "framerate",
"near realtime video"). By our best estimates, the image and video technology offered by
Elphel is more advanced than the minimum requirements, and therefore provides a good solution
that allows us to meet these requirements. Please note, however, that the specific rules
provided by the X PRIZE Foundation are still subject to (hopefully now minor) revisions.
Images
- High quality, show intended contends clear and recognizable
- Minimum eight bits per pixel per color
- Signal to noise ratio 50:1 for scene of albedo approximately to 0.1
- Minimum Resolution: 0,3 millirands/pixel
- Color
- Calibrated for Color Correction
- Reasonable Resolution
- Reasonable contrast at the pixel level, such as would be provided with a system Sagittal and Meridional Modulation Transfer function of 40% in the entire focal plane for the entire spectral range at the Nyquist frequency
Panoramic Images
- Horizon Level
- Horizontal Dimensions: 360°
- Vertical Dimensions: 120°
Detail Images
- Logos clearly legible
Videos
- Near real time videos shall have the following attributes after processing
- Resolution: 320 x 240
- Orientative bitrate: 256kbps
- High Definition Video shall have the following attributes after processing:
- Resolution: 1280 x 720 progressive scan (720p)
- All Videos shall be high quality
- Frame rate appropriate to the action in the frame, and which results in smooth motion
- In color
- Calibrated for color correction
Bandwith
The GLXP doesn't require any bandwidth, just sufficiently high quality. The orientative bitrate 450 kbps comes from knowledge about a recently developed proprietary codec based on H.264 that probably runs in an ASIC or FPGA, combined with the motion profile and limited color space of a video recorded on the moon. I have not actually seen it, just heard about it.
Other than that, we can chose 450 kbps for video + 50 kbps for telemetry. If we can not do 1280x720 25p at sufficient quality with 450kbps we can scale down the size and/or frame rate. In any case, it'd be a good idea to lock the downlink bandwidth. --AlexC
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