Samuel Lima Braz samuellimabraz

Computer vision and robotics. I train, evaluate, and serve vision models, and run them on hardware.

Portfolio

Current work

Volunteer robotics engineer at Black Bee Drones, a UNIFEI team for autonomous indoor drones.

Projects

Nectar SDK . ROS 2 kit for ArduPilot and PX4, cameras, and detection. Shared software for Black Bee missions.
Quantum Assistant . Synthetic multimodal data and PEFT (rsLoRA) on Qwen3-VL-8B for Qiskit. Published in Expert Systems with Applications. Graduation project at UNIFEI.
Signature Detection Model . Open-source YOLOv8s detector, served on Triton with ONNX and OpenVINO, under 200 ms on CPU. 50M+ downloads on Hugging Face.
Vision to MAVROS for ROS 2 . ROS 2 bridge from Intel RealSense T265 pose to ArduPilot and PX4 through MAVROS, for indoor GPS-denied flight.
Chunkr Layout 1 . Synthetic document layouts, YOLO and RF-DETR, and LayoutLMv3-Large for reading order (88.1% exact match, 98.2% Kendall's tau). Served on NVIDIA Triton.
CafeDL . Deep learning library in Java from scratch (Conv2D, Dense, optimizers, ND4J) and a QuickDraw-style sketch classifier.
PID Controller for ROS 2 . Generic PID as a ROS 2 node in C++, with gains that can be changed live.
RoboArm . 4-DOF arm driven from a webcam with MediaPipe and OpenCV, sent to an Arduino Uno over Firmata. Built at Fundação Asimo.
TinyML Capacitor Counting. FOMO object detection on a Seeed XIAO ESP32S3 Sense for counting capacitors. UNIFEI IESTI01 final project.
Computer Vision Hangout. Invited walkthrough at Hugging Face's Computer Vision Hangout.
PEFT Methods. Comparison of full fine-tuning, LoRA, QLoRA, and IA3. English on the Hugging Face blog, Portuguese in AI News Brazil.
OpenCV Explorer. Webcam filters and trackers in the browser (OpenCV, Streamlit, WebRTC).
Board Bring-Up PIC18F4550. Firmware in C: state machine, LCD, ADC, RTC, PWM, keypad, and USB-serial.
EV3 Color Sensor for Arduino . UART library for a LEGO EV3 color sensor (red, blue, color, off). Developed at Fundação Asimo.
EmojiCompiler. C-like language whose tokens are emojis. Lexer and parser in PLY, then translation to C. UNIFEI compilers course.
Kruskal MST. Kruskal on a random graph, rendered frame by frame into a video. UNIFEI graphs course.
Face API. Facial recognition API with DeepFace, FastAPI, and MongoDB Atlas Vector Search.
Hand Mouse Controller. Mouse from hand landmarks: index finger to move, pinch to click. OpenCV and MediaPipe.
EducAI . Mathematics assistant with chat, OCR for handwritten problems, and graph visualization. Team project at UNIFEI.
Agent4ai. Conversational agent for Tech4Humans onboarding. LangGraph routes each question to company documents, Tavily web search, or Google Calendar.
Sorting Algorithms. C++ implementations of Bubble, Selection, Insertion, Shell, Merge, and Quick Sort, timed on strings and integers. A Tkinter GUI plots the times.