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Zaznavanje prometnega znaka stop v realnem času na vgrajenem sistemu STM32H747I
ID Ključanin, Tian (Author), ID Bulić, Patricio (Mentor) More about this mentor... This link opens in a new window

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Abstract
V diplomski nalogi predstavimo celovit cevovod za zaznavanje prometnega znaka stop v realnem času na vgrajenem sistemu STM32H747I-DISCO z modulom kamere B-CAMS-OMV. Iz predtreniranega modela ST Yolo LC v1 za zaznavanje oseb s prenesenim učenjem izpeljemo enorazredni detektor prometnega znaka, ga kvantiziramo v predstavitev INT8 in z orodjem ST Edge AI samodejno generiramo C-kodo za jedro Arm Cortex-M7. Med kvantizacijo modela pri ločljivosti 256^2 odkrijemo nasičenje logitov objektnosti v YOLO glavi; predlagamo popravek s skaliranjem parametrov γ in β zadnje plasti paketne normalizacije, ki INT8 mAP dvigne z 32,4% na 42,3%. Modela pri ločljivostih 192 × 192 in 256 × 256 ovrednotimo na lastni terenski množici 118 fotografij slovenskih znakov stop. Najboljši model doseže 41,6% mAP@0,5, kar je le 0,7 odstotne točke pod rezultatom na validacijski razdelitvi COCO 2017 (42,3%), kar kaže na zanemarljiv domenski razkorak med učno in ciljno domeno.

Language:Slovenian
Keywords:vgrajeni sistemi, konvolucijske nevronske mreže, zaznavanje objektov, kvantizacija, preneseno učenje, STM32
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:FRI - Faculty of Computer and Information Science
Year:2026
PID:20.500.12556/RUL-184389 This link opens in a new window
COBISS.SI-ID:285921027 This link opens in a new window
Publication date in RUL:06.07.2026
Views:170
Downloads:112
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Secondary language

Language:English
Title:Real-Time Stop Sign Detection on an STM32H747I Embedded System
Abstract:
In this thesis we present a complete pipeline for real-time traffic stop-sign detection on the STM32H747I-DISCO embedded system equipped with a B-CAMS-OMV camera module. Starting from the pretrained ST Yolo LC v1 person detector, we use transfer learning to derive a single-class stop-sign detector, quantize it to an INT8 representation, and automatically generate C code for the board’s Arm Cortex-M7 core using the ST Edge AI tool. While quantizing the 256^2 model we discover objectness-logit saturation in the YOLO head; we propose a fix that rescales the γ and β parameters of the final batch-normalization layer, raising the INT8 mAP from 32.4% to 42.3%. We evaluate the 192 × 192 and 256 × 256 models on our own field dataset of 118 photographs of Slovenian stop signs. The best model reaches 41.6% mAP@0.5, only 0.7 percentage points below its result on the COCO 2017 validation split (42.3%), indicating a negligible domain gap between the training and target domains.

Keywords:embedded systems, convolutional neural networks, object detection, quantization, transfer learning, STM32

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