  In this paper, we present Mondrian, an edge system that enables
high-performance object detection on high-resolution video streams. Many
lightweight models and system optimization techniques have been proposed for
resource-constrained devices, but they do not fully utilize the potential of
the accelerators over dynamic, high-resolution videos. To enable such
capability, we devise a novel Compressive Packed Inference to minimize
per-pixel processing costs by selectively determining the necessary pixels to
process and combining them to maximize processing parallelism. In particular,
our system quickly extracts ROIs and dynamically shrinks them, reflecting the
effect of the fast-changing characteristics of objects and scenes. It then
intelligently combines such scaled ROIs into large canvases to maximize the
utilization of inference accelerators such as GPU. Evaluation across various
datasets, models, and devices shows Mondrian outperforms state-of-the-art
baselines (e.g., input rescaling, ROI extractions, ROI extractions+batching) by
15.0-19.7% higher accuracy, leading to $\times$6.65 higher throughput than
frame-wise inference for processing various 1080p video streams. We will
release the code after the paper review.
