Dithered soft decision quantization for baseline JPEG encoding and its joint optimization with huffman coding and quantization table selection
Bibliographic record
Abstract
Based on baseline JPEG, a new image coding framework is first developed, where dithered (uniform) quantizers are used to replace JPEG uniform quantizers for the purpose of improving the rate-distortion performance without sacrificing the coding complexity instead of the conventional subjective image quality. By combining dithering with soft decision quantization (SDQ)-yielding dithered SDQ, an iterative algorithm is then proposed for jointly designing dithers for DCT coefficients at each frequency (i.e., dither table), quantization table, run-length coding, and Huffman coding. The algorithm converges in the sense that its rate-distortion cost is monotonically decreasing until a stationary point is reached. When compared with state-of-the-art baseline JPEG R-D optimizer proposed recently by Yang and Wang, our algorithm achieves comparable and sometimes better rate-distortion performance with 65% computational complexity reduction.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".