Detecting and Localizing 3D Object Classes using Viewpoint Invariant Reference Frames
Bibliographic record
Abstract
In this paper, we investigate detection and localization of general 3D object classes by relating local scale-invariant features to a viewpoint invariant reference frame. This can generally be achieved by either a multi-view representation, where features and reference frame are modeled as a collection of distinct views, or by a viewpoint invariant representation, where features and reference frame are modeled independently of viewpoint. We compare multi-view and viewpoint invariant representations trained and tested on the same data, where the viewpoint invariant approach results in fewer false positive detections and higher average precision. We present a new, iterative learning algorithm to determine an optimal viewpoint invariant reference frame from training images in a data-driven manner. The learned optimal reference frame is centrally located with respect to the 3D object class and to image features in a given view, thereby minimizing reference frame localization error as predicted by theory and maintaining a consistent geometrical interpretation with respect to the underlying object class. Modeling and detection based on the optimal reference frame improves detection performance for both multiview and viewpoint invariant representations. Experimentation is performed on the class of 3D faces, using the public color FERET database for training, the CMU profile database for testing and SIFT image features.
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How this classification was reachedexpand
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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".