Focal Stack Image Compression Based on Basis-Quadtree Representation
Why this work is in the frame
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Bibliographic record
Abstract
In this paper, we propose an efficient compression scheme for focal stack images (FoSIs) based on a new basis-quadtree representation. In the new basis-quadtree representation, FoSIs are initially reorganized as co-located block groups in the depth dimension. In each group, selective basis blocks and adaptive quadtree partition are optimized to predict the focused or defocused co-located blocks by intra-group approximation. By solving a joint optimization problem, FoSIs can be efficiently represented by the optimal basis blocks, corresponding quadtree partition and approximation parameters, which will be compressed separately. Then, these basis blocks are stitched into several new frames (basis frames) according to their original locations and partition modes. Basis frames are compressed by our designed encoder, where the intra-group approximation is embedded into the high efficiency video coding (HEVC) encoder. Thus, the redundancies of basis blocks can be further eliminated. Finally, the approximation parameters are refined to suppress the amplified errors caused by introduced compression blur after basis frame coding. The refined parameters are compressed losslessly and multiplexed with the bitstream of the basis frames to ensure the reconstruction quality of FoSIs. Experiments on 12 test sequences demonstrate that the proposed scheme can obtain higher coding performance than the state-of-the-art comparison schemes. Specifically, the proposed scheme achieves up to 5.23 dB PSNR gains and 71.59% bitrate savings over the HEVC baseline scheme on sequences I03 and I05, respectively.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 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 it