senior-computer-vision

name

senior-computer-vision

description

Computer vision engineering skill for object detection, image segmentation, and visual AI systems. Covers CNN and Vision Transformer architectures, YOLO/Faster R-CNN/DETR detection, Mask R-CNN/SAM segmentation, and production deployment with ONNX/TensorRT. Includes PyTorch, torchvision, Ultralytics, Detectron2, and MMDetection frameworks. Use when building detection pipelines, training custom models, optimizing inference, or deploying vision systems.

Senior Computer Vision Engineer

Production computer vision engineering skill for object detection, image segmentation, and visual AI system deployment.

Table of Contents

• Quick Start
• Core Expertise
• Tech Stack
• Workflow 1: Object Detection Pipeline
• Workflow 2: Model Optimization and Deployment
• Workflow 3: Custom Dataset Preparation
• Architecture Selection Guide
• Reference Documentation
• Common Commands

Quick Start

# Generate training configuration for YOLO or Faster R-CNN
python scripts/vision_model_trainer.py models/ --task detection --arch yolov8

# Analyze model for optimization opportunities (quantization, pruning)
python scripts/inference_optimizer.py model.pt --target onnx --benchmark

# Build dataset pipeline with augmentations
python scripts/dataset_pipeline_builder.py images/ --format coco --augment

Core Expertise

This skill provides guidance on:

• Object Detection: YOLO family (v5-v11), Faster R-CNN, DETR, RT-DETR
• Instance Segmentation: Mask R-CNN, YOLACT, SOLOv2
• Semantic Segmentation: DeepLabV3+, SegFormer, SAM (Segment Anything)
• Image Classification: ResNet, EfficientNet, Vision Transformers (ViT, DeiT)
• Video Analysis: Object tracking (ByteTrack, SORT), action recognition
• 3D Vision: Depth estimation, point cloud processing, NeRF
• Production Deployment: ONNX, TensorRT, OpenVINO, CoreML

Tech Stack

Category	Technologies
Frameworks	PyTorch, torchvision, timm
Detection	Ultralytics (YOLO), Detectron2, MMDetection
Segmentation	segment-anything, mmsegmentation
Optimization	ONNX, TensorRT, OpenVINO, torch.compile
Image Processing	OpenCV, Pillow, albumentations
Annotation	CVAT, Label Studio, Roboflow
Experiment Tracking	MLflow, Weights & Biases
Serving	Triton Inference Server, TorchServe

Workflow 1: Object Detection Pipeline

Use this workflow when building an object detection system from scratch.

Step 1: Define Detection Requirements

Analyze the detection task requirements:

Detection Requirements Analysis:
- Target objects: [list specific classes to detect]
- Real-time requirement: [yes/no, target FPS]
- Accuracy priority: [speed vs accuracy trade-off]
- Deployment target: [cloud GPU, edge device, mobile]
- Dataset size: [number of images, annotations per class]

Step 2: Select Detection Architecture

Choose architecture based on requirements:

Requirement	Recommended Architecture	Why
Real-time (>30 FPS)	YOLOv8/v11, RT-DETR	Single-stage, optimized for speed
High accuracy	Faster R-CNN, DINO	Two-stage, better localization
Small objects	YOLO + SAHI, Faster R-CNN + FPN	Multi-scale detection
Edge deployment	YOLOv8n, MobileNetV3-SSD	Lightweight architectures
Transformer-based	DETR, DINO, RT-DETR	End-to-end, no NMS required

Step 3: Prepare Dataset

Convert annotations to required format:

# COCO format (recommended)
python scripts/dataset_pipeline_builder.py data/images/ \
    --annotations data/labels/ \
    --format coco \
    --split 0.8 0.1 0.1 \
    --output data/coco/

# Verify dataset
python -c "from pycocotools.coco import COCO; coco = COCO('data/coco/train.json'); print(f'Images: {len(coco.imgs)}, Categories: {len(coco.cats)}')"

Step 4: Configure Training

Generate training configuration:

# For Ultralytics YOLO
python scripts/vision_model_trainer.py data/coco/ \
    --task detection \
    --arch yolov8m \
    --epochs 100 \
    --batch 16 \
    --imgsz 640 \
    --output configs/

# For Detectron2
python scripts/vision_model_trainer.py data/coco/ \
    --task detection \
    --arch faster_rcnn_R_50_FPN \
    --framework detectron2 \
    --output configs/

Step 5: Train and Validate

# Ultralytics training
yolo detect train data=data.yaml model=yolov8m.pt epochs=100 imgsz=640

# Detectron2 training
python train_net.py --config-file configs/faster_rcnn.yaml --num-gpus 1

# Validate on test set
yolo detect val model=runs/detect/train/weights/best.pt data=data.yaml

Step 6: Evaluate Results

Key metrics to analyze:

Metric	Target	Description
mAP@50	>0.7	Mean Average Precision at IoU 0.5
mAP@50:95	>0.5	COCO primary metric
Precision	>0.8	Low false positives
Recall	>0.8	Low missed detections
Inference time	<33ms	For 30 FPS real-time

Workflow 2: Model Optimization and Deployment

Use this workflow when preparing a trained model for production deployment.

Step 1: Benchmark Baseline Performance

# Measure current model performance
python scripts/inference_optimizer.py model.pt \
    --benchmark \
    --input-size 640 640 \
    --batch-sizes 1 4 8 16 \
    --warmup 10 \
    --iterations 100

Expected output:

Baseline Performance (PyTorch FP32):
- Batch 1: 45.2ms (22.1 FPS)
- Batch 4: 89.4ms (44.7 FPS)
- Batch 8: 165.3ms (48.4 FPS)
- Memory: 2.1 GB
- Parameters: 25.9M

Step 2: Select Optimization Strategy

Deployment Target	Optimization Path
NVIDIA GPU (cloud)	PyTorch → ONNX → TensorRT FP16
NVIDIA GPU (edge)	PyTorch → TensorRT INT8
Intel CPU	PyTorch → ONNX → OpenVINO
Apple Silicon	PyTorch → CoreML
Generic CPU	PyTorch → ONNX Runtime
Mobile	PyTorch → TFLite or ONNX Mobile

Step 3: Export to ONNX

# Export with dynamic batch size
python scripts/inference_optimizer.py model.pt \
    --export onnx \
    --input-size 640 640 \
    --dynamic-batch \
    --simplify \
    --output model.onnx

# Verify ONNX model
python -c "import onnx; model = onnx.load('model.onnx'); onnx.checker.check_model(model); print('ONNX model valid')"

Step 4: Apply Quantization (Optional)

For INT8 quantization with calibration:

# Generate calibration dataset
python scripts/inference_optimizer.py model.onnx \
    --quantize int8 \
    --calibration-data data/calibration/ \
    --calibration-samples 500 \
    --output model_int8.onnx

Quantization impact analysis:

Precision	Size	Speed	Accuracy Drop
FP32	100%	1x	0%
FP16	50%	1.5-2x	<0.5%
INT8	25%	2-4x	1-3%

Step 5: Convert to Target Runtime

# TensorRT (NVIDIA GPU)
trtexec --onnx=model.onnx --saveEngine=model.engine --fp16

# OpenVINO (Intel)
mo --input_model model.onnx --output_dir openvino/

# CoreML (Apple)
python -c "import coremltools as ct; model = ct.convert('model.onnx'); model.save('model.mlpackage')"

Step 6: Benchmark Optimized Model

python scripts/inference_optimizer.py model.engine \
    --benchmark \
    --runtime tensorrt \
    --compare model.pt

Expected speedup:

Optimization Results:
- Original (PyTorch FP32): 45.2ms
- Optimized (TensorRT FP16): 12.8ms
- Speedup: 3.5x
- Accuracy change: -0.3% mAP

Workflow 3: Custom Dataset Preparation

Use this workflow when preparing a computer vision dataset for training.

Step 1: Audit Raw Data

# Analyze image dataset
python scripts/dataset_pipeline_builder.py data/raw/ \
    --analyze \
    --output analysis/

Analysis report includes:

Dataset Analysis:
- Total images: 5,234
- Image sizes: 640x480 to 4096x3072 (variable)
- Formats: JPEG (4,891), PNG (343)
- Corrupted: 12 files
- Duplicates: 45 pairs

Annotation Analysis:
- Format detected: Pascal VOC XML
- Total annotations: 28,456
- Classes: 5 (car, person, bicycle, dog, cat)
- Distribution: car (12,340), person (8,234), bicycle (3,456), dog (2,890), cat (1,536)
- Empty images: 234

Step 2: Clean and Validate

# Remove corrupted and duplicate images
python scripts/dataset_pipeline_builder.py data/raw/ \
    --clean \
    --remove-corrupted \
    --remove-duplicates \
    --output data/cleaned/

Step 3: Convert Annotation Format

# Convert VOC to COCO format
python scripts/dataset_pipeline_builder.py data/cleaned/ \
    --annotations data/annotations/ \
    --input-format voc \
    --output-format coco \
    --output data/coco/

Supported format conversions:

From	To
Pascal VOC XML	COCO JSON
YOLO TXT	COCO JSON
COCO JSON	YOLO TXT
LabelMe JSON	COCO JSON
CVAT XML	COCO JSON

Step 4: Apply Augmentations

# Generate augmentation config
python scripts/dataset_pipeline_builder.py data/coco/ \
    --augment \
    --aug-config configs/augmentation.yaml \
    --output data/augmented/

Recommended augmentations for detection:

# configs/augmentation.yaml
augmentations:
  geometric:
    - horizontal_flip: { p: 0.5 }
    - vertical_flip: { p: 0.1 }  # Only if orientation invariant
    - rotate: { limit: 15, p: 0.3 }
    - scale: { scale_limit: 0.2, p: 0.5 }

  color:
    - brightness_contrast: { brightness_limit: 0.2, contrast_limit: 0.2, p: 0.5 }
    - hue_saturation: { hue_shift_limit: 20, sat_shift_limit: 30, p: 0.3 }
    - blur: { blur_limit: 3, p: 0.1 }

  advanced:
    - mosaic: { p: 0.5 }  # YOLO-style mosaic
    - mixup: { p: 0.1 }   # Image mixing
    - cutout: { num_holes: 8, max_h_size: 32, max_w_size: 32, p: 0.3 }

Step 5: Create Train/Val/Test Splits

python scripts/dataset_pipeline_builder.py data/augmented/ \
    --split 0.8 0.1 0.1 \
    --stratify \
    --seed 42 \
    --output data/final/

Split strategy guidelines:

Dataset Size	Train	Val	Test
<1,000 images	70%	15%	15%
1,000-10,000	80%	10%	10%
>10,000	90%	5%	5%

Step 6: Generate Dataset Configuration

# For Ultralytics YOLO
python scripts/dataset_pipeline_builder.py data/final/ \
    --generate-config yolo \
    --output data.yaml

# For Detectron2
python scripts/dataset_pipeline_builder.py data/final/ \
    --generate-config detectron2 \
    --output detectron2_config.py

Architecture Selection Guide

Object Detection Architectures

Architecture	Speed	Accuracy	Best For
YOLOv8n	1.2ms	37.3 mAP	Edge, mobile, real-time
YOLOv8s	2.1ms	44.9 mAP	Balanced speed/accuracy
YOLOv8m	4.2ms	50.2 mAP	General purpose
YOLOv8l	6.8ms	52.9 mAP	High accuracy
YOLOv8x	10.1ms	53.9 mAP	Maximum accuracy
RT-DETR-L	5.3ms	53.0 mAP	Transformer, no NMS
Faster R-CNN R50	46ms	40.2 mAP	Two-stage, high quality
DINO-4scale	85ms	49.0 mAP	SOTA transformer

Segmentation Architectures

Architecture	Type	Speed	Best For
YOLOv8-seg	Instance	4.5ms	Real-time instance seg
Mask R-CNN	Instance	67ms	High-quality masks
SAM	Promptable	50ms	Zero-shot segmentation
DeepLabV3+	Semantic	25ms	Scene parsing
SegFormer	Semantic	15ms	Efficient semantic seg

CNN vs Vision Transformer Trade-offs

Aspect	CNN (YOLO, R-CNN)	ViT (DETR, DINO)
Training data needed	1K-10K images	10K-100K+ images
Training time	Fast	Slow (needs more epochs)
Inference speed	Faster	Slower
Small objects	Good with FPN	Needs multi-scale
Global context	Limited	Excellent
Positional encoding	Implicit	Explicit

Reference Documentation

1. Computer Vision Architectures

See references/computer_vision_architectures.md for:

• CNN backbone architectures (ResNet, EfficientNet, ConvNeXt)
• Vision Transformer variants (ViT, DeiT, Swin)
• Detection heads (anchor-based vs anchor-free)
• Feature Pyramid Networks (FPN, BiFPN, PANet)
• Neck architectures for multi-scale detection

2. Object Detection Optimization

See references/object_detection_optimization.md for:

• Non-Maximum Suppression variants (NMS, Soft-NMS, DIoU-NMS)
• Anchor optimization and anchor-free alternatives
• Loss function design (focal loss, GIoU, CIoU, DIoU)
• Training strategies (warmup, cosine annealing, EMA)
• Data augmentation for detection (mosaic, mixup, copy-paste)

3. Production Vision Systems

See references/production_vision_systems.md for:

• ONNX export and optimization
• TensorRT deployment pipeline
• Batch inference optimization
• Edge device deployment (Jetson, Intel NCS)
• Model serving with Triton
• Video processing pipelines

Common Commands

Ultralytics YOLO

# Training
yolo detect train data=coco.yaml model=yolov8m.pt epochs=100 imgsz=640

# Validation
yolo detect val model=best.pt data=coco.yaml

# Inference
yolo detect predict model=best.pt source=images/ save=True

# Export
yolo export model=best.pt format=onnx simplify=True dynamic=True

Detectron2

# Training
python train_net.py --config-file configs/COCO-Detection/faster_rcnn_R_50_FPN_3x.yaml \
    --num-gpus 1 OUTPUT_DIR ./output

# Evaluation
python train_net.py --config-file configs/faster_rcnn.yaml --eval-only \
    MODEL.WEIGHTS output/model_final.pth

# Inference
python demo.py --config-file configs/faster_rcnn.yaml \
    --input images/*.jpg --output results/ \
    --opts MODEL.WEIGHTS output/model_final.pth

MMDetection

# Training
python tools/train.py configs/faster_rcnn/faster-rcnn_r50_fpn_1x_coco.py

# Testing
python tools/test.py configs/faster_rcnn.py checkpoints/latest.pth --eval bbox

# Inference
python demo/image_demo.py demo.jpg configs/faster_rcnn.py checkpoints/latest.pth

Model Optimization

# ONNX export and simplify
python -c "import torch; model = torch.load('model.pt'); torch.onnx.export(model, torch.randn(1,3,640,640), 'model.onnx', opset_version=17)"
python -m onnxsim model.onnx model_sim.onnx

# TensorRT conversion
trtexec --onnx=model.onnx --saveEngine=model.engine --fp16 --workspace=4096

# Benchmark
trtexec --loadEngine=model.engine --batch=1 --iterations=1000 --avgRuns=100

Performance Targets

Metric	Real-time	High Accuracy	Edge
FPS	>30	>10	>15
mAP@50	>0.6	>0.8	>0.5
Latency P99	<50ms	<150ms	<100ms
GPU Memory	<4GB	<8GB	<2GB
Model Size	<50MB	<200MB	<20MB

Resources

• Architecture Guide: references/computer_vision_architectures.md
• Optimization Guide: references/object_detection_optimization.md
• Deployment Guide: references/production_vision_systems.md
• Scripts: scripts/ directory for automation tools