Data-efficient transformer-based 3D object detection

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This thesis work intends to study 3D point clouds object detection from indoor scenes. 3D object detection aims to recognize classes of object categories and locate them by drawing a bounding box around an object. To achieve this final goal of predicting a set of bounding boxes from an input scan, a machine learning model must extract necessary features that describe the scene points. Nevertheless, at this moment, 3D scene under- standing poses a challenge, as 3D point cloud data is unique: it is orderless, sparse, and continuous. Recent 3D detection models rely on Transformer architecture due to its natural ability to abstract global context features. One is the 3DETR network - a pure transformer-based model designed to generate 3D boxes on indoor dataset scans. It is generally known that transformers are data-hungry. However, data collection and annotation in 3D are more challenging than in 2D. Thus, our goal is to study the data-hungriness of the 3DETR-m model and propose a solution for its data efficiency. Our methodology is based on the observation that PointNet++ provides more locally aggregated features that can be useful to support 3DETR-m prediction on small dataset problem. We suggest three methods of backbone fusion that are based on addition (Fusion I), concatenation (Fusion II), and replacement (Fusion III). We utilize pre-trained weights from the Group-free model trained on the SUN RGB-D dataset. The proposed 3DETR-m outperforms the original model in all data proportions (10%, 25%, 50%, 75%, and 100%). We improve 3DETR-m paper results by 1.46% and 2.46% in mAP@25 and mAP@50 on the full dataset. Hence, we believe our research efforts can provide new insights into the data- hungriness issue of 3D transformer detectors and inspire the usage of pre-trained models in 3D as one way towards data efficiency.

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Thesis submitted to the Deanship of Graduate and Postdoctoral Studies

In partial fulfillment of the requirements for the M.Sc degree in Computer Vision

Advisors: Dr. Hisham Cholakkal, Dr. Fahad Khan

with permanent embargo

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