1 / 11

Comparison Study on the Performance of Critically Sampled Pyramid vs. Over-Complete Pyramid

Comparison Study on the Performance of Critically Sampled Pyramid vs. Over-Complete Pyramid. Overview. Introduction of multiresolution and pyramid coding Critically sampled and overcomplete pyramids Bit allocation and quantization Comparison and results. Multiresolution and Pyramid Coding.

terrel
Download Presentation

Comparison Study on the Performance of Critically Sampled Pyramid vs. Over-Complete Pyramid

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Comparison Study on the Performance of Critically Sampled Pyramid vs. Over-Complete Pyramid

  2. Overview • Introduction of multiresolution and pyramid coding • Critically sampled and overcomplete pyramids • Bit allocation and quantization • Comparison and results

  3. Multiresolution and Pyramid Coding • Multiresolution offers excellent coding efficiency. • Multiresolution supports scalability. r=0.09, 0.23, 0.60, 1.00 bpp

  4. 2 2 2 2 2 2 2 2 Critically Sampled Pyramid H1 Q G1 Q H1 G1 + Input H0 Recon. G0 + Q H0 G0 Octave subband coding Channel Original Image Decomp. Subbands

  5. Oversampled Pyramid

  6. Choosing the Filters

  7. Bit Allocation • Analytical form Critically sampled, open-loop oversampled • The “greedy” algorithm Close-loop oversampled where

  8. Comparison of Rate-distortion Performance In general, critically sampled outperforms oversampled in terms of rate-distortion. Reason: oversampling.

  9. Scalability Critically sampled Overcomplete PSNR = 28.4 dB PSNR = 28.4 dB PSNR = 27.2 dB PSNR = 27.2 dB PSNR = 23.8 dB PSNR = 20.9 dB PSNR = 25.8 dB PSNR = 22.8 dB

  10. Number of Layers Critically sampled Overcomplete

  11. Conclusions • Critically sampled pyramid outperforms the over-complete pyramid in terms of rate-distortion. • Coarse images from overcomplete pyramids show better subjective quality. • Other features of overcomplete pyramid: lower complexity, freedom in choosing filters, control of quantization noise.

More Related