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NAC-Slide: Displaying Very Large NAC Images Robert Wagner Mentor: Mark Robinson

NAC-Slide: Displaying Very Large NAC Images Robert Wagner Mentor: Mark Robinson School of Earth and Space Exploration, ASU 17 April 2010. NAC-Slide Overview. Objective was to display the very large LROC Narrow Angle Camera images at full resolution.

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NAC-Slide: Displaying Very Large NAC Images Robert Wagner Mentor: Mark Robinson

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  1. NAC-Slide: Displaying Very Large NAC Images Robert Wagner Mentor: Mark Robinson School of Earth and Space Exploration, ASU 17 April 2010

  2. NAC-Slide Overview • Objective was to display the very large LROC Narrow Angle Camera images at full resolution. • Initial goal was to display NAC images on the LROC Science Operations Center’s Tile Wall. • Developed “NAC-Slide”: Automatically scrolls through LROC NAC images.

  3. LROC Narrow Angle Camera • Two high-resolution cameras • 12-bit grayscale images • 5064 pixels per line • Usually 52224 lines • Nominal resolution: 50cm/pixel • Footprint:2.5km by 25km • With paired images, 5km by 25km footprint

  4. The Tile Wall • 3x3 grid of high-resolution monitors • Total size approximately 7500x6000 pixels • Runs on Ubuntu Linux LROC Science Operations Center

  5. NAC left NAC right Displaying Large Images • A standard 1024x768 monitor can only display 0.3% of a NAC image at full resolution. • Even the Tile Wall can only display 10% of a NAC image at full resolution. • Solution: Scroll vertically down the image. • Works on Tile Wall, which can display the full width of a NAC image • Not so good for personal computers

  6. NAC-Slide Design • Four elements • Full-resolution view • Overview map • Histogram • Image information

  7. Overview Map • Shows entire image, and location of the main viewpoint. Histogram • Shows the distribution of pixel values in the image. • Allows science team to easily assess validity of camera settings for the image.

  8. Information Window • Shows location, size, and capture date of image. • Lists major nearby features, based on a database of feature names and locations.

  9. Implementation • Developed in C • Command-line driven, with optional parameters • Image list, scroll speed, etc. • Used X Windows library for interface • Cross-platform (Linux, Mac OS) • Challenges: • Reading NAC image formats • Good automated stretch from 12-bit to 8-bit • Readable text on huge screens

  10. Results and Future Work • NAC Slide on the Tile Wall gives the scientists in the control room near-real-time feedback on what the NAC images actually look like. • Current goal: Create a NAC image viewer that works well on small monitors, for quickly looking through images at full resolution. • Steps across an image, one screen-full at a time • First version is mostly complete

  11. Questions? NAC image M104227032L

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