Space-frequency motion model for subband/wavelet video coding
Bibliographic record
Abstract
Wavelet-transform lossy coding achieves state-of-the-art performance for still images. For motion-compensated interframes, however, block-transform coding is preferred due to its ability to intracode poorly predicted blocks. Space-frequency half-pixel block matching is a new approach that enables hybrid block-motion-compensated wavelet-coded interframes to efficiently code blocks with low temporal correlation of high-frequency details. Architectural compatibility is maintained and little additional complexity is required to achieve superior performance. Simulation results with both fixed-size block matching and hierarchical-variable-sized block matching indicate that a block size-constrained adaptive choice of interpolation filter improves the PSNR by 0.75 dB for hybrid wavelet interframe coding (versus +0.25 dB for H.263) at multimedia quality bit rates. For H.263, bit rate reduction can approach 30% at higher rates. The method is perceptually successful where a block-translational motion model fails, efficiently reducing falsely introduced detail.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 0.002 |
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".