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Performance of customized dct quantization tables on scientific data
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Ratnakar, Viresh Livny, Miron |
| Copyright Year | 1994 |
| Description | We show that it is desirable to use data-specific or customized quantization tables for scaling the spatial frequency coefficients obtained using the Discrete Cosine Transform (DCT). DCT is widely used for image and video compression (MP89, PM93) but applications typically use default quantization matrices. Using actual scientific data gathered from divers sources such as spacecrafts and electron-microscopes, we show that the default compression/quality tradeoffs can be significantly improved upon by using customized tables. We also show that significant improvements are possible for the standard test images Lena and Baboon. This work is part of an effort to develop a practical scheme for optimizing quantization matrices for any given image or video stream, under any given quality or compression constraints. |
| File Size | 346790 |
| Page Count | 8 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19950008172 |
| Archival Resource Key | ark:/13960/t8x974h6d |
| Language | English |
| Publisher Date | 1994-09-01 |
| Access Restriction | Open |
| Subject Keyword | Image Processing Signal To Noise Ratios Satellite Observation Data Reduction Visual Perception Tables Data Algorithms Spatial Distribution Gray Scale Tradeoffs Information Transfer Video Compression Image Enhancement Scientific Visualization Discrete Cosine Transform Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
