NDSF Optical Imaging Review

NDSF Optical Imaging Review

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Author: William N. Lange (Fellow) | Visits: 1514 | Page Views: 1516
Domain:  High Tech Category: Photo Subcategory: Oceanographic 
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Contents:
DESSC December 2007

NDSF Optical Imaging Review
William N. Lange
Advanced Imaging and Visualization Laboratory Woods Hole Oceanographic Institution

NDSF Optical Imaging Review

DESSC December 2007

Design Goals for HDTV Upgrade
To develop an imaging system upgrade that improves the overall quality of motion and still-based imagery on Jason and Alvin without impacting the day rate.
As a by-product of this upgrade, our resulting infrastructure would become more closely compatible with current and future media best-practice. This would greatly simplify future collaborations between documentary filmmakers and scientific parties (opportunities that often arise 3 months precruise) and, thus, also enhance NDSF's ability to support "Broader Impacts".

NDSF Optical Imaging Review

DESSC December 2007

Hybrid HDTV Camera Head
Design Criteria:
� Small, high dynamic range (12 Bit) CCD camera heads � High-quality HDTV zoom optics � Parallel data output pipeline � Full native resolution of the sensor's still image data (1920 x 1080 x 12 bit) � 29.97 frames per second motion video output (compatible with the existing video plants on Jason and Alvin)

NDSF Optical Imaging Review

DESSC December 2007

Still Frame Acquisition
Still frames will be acquired in two modes:
� Interval Mode
� Set by operator such that the images are taken every n number of seconds

� Science On-Demand Mode
� Frame acquisition initiated by science

NDSF Optical Imaging Review

DESSC December 2007

Proposed NDSF HDTV Imaging Upgrade
HDTV Camera Head

Still Image Recorder

29.97 FPS ITU-709 Motion Processor

Time Stamped 12 Bit Still Images

Motion Digital Format Converter

Remote Hard Drive

SDTV DVCAM

NDSF Optical Imaging Review

DESSC December 2007

Camera Sensitivity
WHOI is currently evaluating sensors for the camera head that may decrease the amount of lighting required. It is hoped that the result will be an increase of 1.5 to 2 times the sensitivity over the cameras used in the 2007 evaluation process.

NDSF Optical Imaging Review

DESSC December 2007

Hybrid HDTV Camera Optics
A 13X zoom lens was selected over a smaller, less expensive fixed focal length lens design after input from the scientific community at the spring DESSC Meeting. This change requires a 7-inch OD housing.

DESSC December 2007

DESSC December 2007

NDSF Optical Imaging Review

DESSC December 2007

Camera Head Design
The Advanced Imaging and Visualization Lab (AIVL) at WHOI has already developed this design for the US Navy as well as other customers. The design is based on a 13,500 psi, 7000m-rated camera pressure housing sufficient for use on Alvin, RHOV and Jason.

NDSF Optical Imaging Review

DESSC December 2007

NDSF 2007 Tests and Evaluation
� Alvin, AT15-15, January
- 3-CCD HDTV �" camera with zoom optics - 3D HDTV stereoscopic single-CCD cameras with fixed optics

� Jason, JDF, August
- Single-CCD HDTV camera with zoom optics - Recording format and compression testing

NDSF Optical Imaging Review

DESSC December 2007

Alvin 3-CCD HDTV Still Image

NDSF Optical Imaging Review

DESSC December 2007

Alvin 3-CCD HDTV Still Image

NDSF Optical Imaging Review

DESSC December 2007

Alvin Single-CCD HDTV Still Image

NDSF Optical Imaging Review

DESSC December 2007

Alvin Single-CCD HDTV Still Image

NDSF Optical Imaging Review

DESSC December 2007

Jason Single-CCD HDTV Still Image

NDSF Optical Imaging Review

DESSC December 2007

Jason Single-CCD HDTV Still Image

NDSF Optical Imaging Review

DESSC December 2007

Wide View

NDSF Optical Imaging Review

DESSC December 2007

Medium

NDSF Optical Imaging Review

DESSC December 2007

Close-Up

NDSF Optical Imaging Review

DESSC December 2007

Lighting and Placement
� Alvin operated with three 400W HMIs � Jason operated with four 400W HMIs � Jason's imagery appeared to be darker than Alvin, but the HDTV camera was not mounted in an ideal position � Alvin and Jason can benefit from improved utilization of their existing lighting systems � Reorientation of camera/light geometries and lighting footprints should improve overall quality � The addition of HMI, HID, LED or quartz light heads on Jason is recommended

NDSF Optical Imaging Review

DESSC December 2007

Lighting (cont.)
Hybrid Pulsed Illumination Lighting and Lighting Augmentation

� WHOI will evaluate using strobe or LEDs for a pulsed illumination lighting source to augment the continuous lights for still image acquisition. � This will necessitate a software modification to the camera controller to release the motion mode presets so that the motion frame is not saturated. � LED tests currently being conducted on Alvin are showing promise as a viable lower power alternative to HMI and HID lighting systems. These will be equally applicable to Jason in the future.

NDSF Optical Imaging Review

DESSC December 2007

NDSF 2007 HDTV Programs
Jason Recording System Evaluations:
� RAID recorder - Raw, still, time lapse, motion 29.97 fps � Sony HDCam recorder � Sony SRW recorder � Sony DVCam recorder � Jason DVD recorder
All systems were time-stamped to the Jason time source for comparison

DESSC December 2007

Evaluating still image capture allows us to test both still and motion recording quality.

NDSF Optical Imaging Review

DESSC December 2007

DVD Recorder Full Frame
(e.g. from current Jason system)

NDSF Optical Imaging Review

DESSC December 2007

DVCam Recorder Full Frame
(e.g. from current Alvin system)

NDSF Optical Imaging Review

DESSC December 2007

HDCam Recorder Full Frame

NDSF Optical Imaging Review

DESSC December 2007

SRW Recorder Full Frame

NDSF Optical Imaging Review

DESSC December 2007

RAID Recorder Full Frame

NDSF Optical Imaging Review

DESSC December 2007

The Way Forward
� Endorsement by DESSC of HDTV upgrade plan for Alvin and Jason � Acquisition of two HDTV cameras with zoom optics; interface and control electronics � Integration and testing of HDTV cameras on Alvin and Jason by end of 2008 � Operated as standard equipment; zero cost impact on vehicle day rate

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