Wildenstein, Diego
(2021)
Towards Intelligent Compression of Hyperspectral Imagery.
Master's Thesis, University of Pittsburgh.
(Unpublished)
Abstract
For space applications, communications bandwidth is often contested and limited. Limited communications is particularly evident for space vehicles in low-Earth orbit, where space-based sensor platforms that collect excess amounts of data will often have difficulty communicating this data in a timely manner. Data compression is a necessary step in transferring large files, such as high resolution images, as it allows a system to make more efficient use of communications bandwidth. Sensing systems continue to evolve with increased resolutions and data rates that effectively increase the overall amount of data. Hyperspectral cameras are one type of imaging sensors that produce vast amounts of data relative to conventional camera systems. Due to the data increase, hyperspectral sensors can potentially benefit significantly from data compression. CNN-JPEG is a state-of-the-art, neural network-based compression framework. This algorithm is a lossy, end-to-end image compression system that has been adapted from previous literature to compress hyperspectral imagery collected from the Airborne Visible Infrared Imaging Spectrometer (AVIRIS) sensor. By applying the CNN-JPEG algorithm to hyperspectral imagery, we achieve upwards of 17$\times$ compression ratios over the original image on average for each spectral band. Additionally, CNN-JPEG compression provides over 14$\times$ compression across an entire hyperspectral dataset. This increased compression ratio comes at the cost of decreased reconstruction quality. Additionally, the amount of compression delivered by CNN-JPEG is highly dependent on the content of the image. CNN-JPEG provides a unique option for space platforms in which high compression is desired with acceptable losses in image quality.
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Details
| Item Type: |
University of Pittsburgh ETD
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| Status: |
Unpublished |
| Creators/Authors: |
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| ETD Committee: |
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| Date: |
13 June 2021 |
| Date Type: |
Publication |
| Defense Date: |
1 April 2021 |
| Approval Date: |
13 June 2021 |
| Submission Date: |
5 April 2021 |
| Access Restriction: |
1 year -- Restrict access to University of Pittsburgh for a period of 1 year. |
| Number of Pages: |
40 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Electrical and Computer Engineering |
| Degree: |
MS - Master of Science |
| Thesis Type: |
Master's Thesis |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
Adaptive Compression, Hyperspectral Imagery, Image Compression |
| Date Deposited: |
13 Jun 2021 18:43 |
| Last Modified: |
13 Jun 2022 05:15 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/40519 |
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