AI-Powered Car Damage Detection: Training a Model for Scratch & Dent Identification

Year

2023

Industry

Automotive

AISoftware
Challenge

Traditional car inspection methods for detecting scratches and dents were time-consuming, subjective, and prone to human error. Automating this process required a highly accurate AI model capable of identifying even minor damages across various car surfaces, lighting conditions, and angles. Ensuring model precision while handling diverse image inputs was a significant challenge.

Solution

Developed and trained a deep learning model using a vast dataset of car images with labeled scratches and dents. Leveraged convolutional neural networks (CNNs) to analyze patterns, textures, and anomalies in vehicle surfaces. The training process involved data augmentation techniques to improve accuracy under different lighting and environmental conditions. Integrated the model into an intuitive system that enables real-time damage assessment through image uploads. The solution significantly enhanced inspection efficiency, reduced human dependency, and provided precise damage classification, making it ideal for insurance companies, car rental agencies, and vehicle maintenance businesses.

Car Panel Label Rules

Doors (Passenger Doors)

  • The metallic part of the door below the window should be annotated.
  • F_door: Front door
  • R_door: Rear door

Door Window

  • Covers the glass pane and black rubber supports but not the car pillar.
  • Fd_window: Includes window and rubber support, excludes side mirror.
  • Rd_window: If split by thick carbon fiber, follow window edges and include rubber support.

Quarter Window

  • If separated by thick carbon fiber/metal, annotate it separately.
  • Label: quarter_window

Screen Pillar (A, B, C, D-Pillar)

  • Start from the external edge of the quarter window to the lower windshield edge.
  • Label: screen_pillar

Roof

  • Excludes roof rails and screen pillar.
  • Label: roof

Roof Rails

  • Follow edges of roof rails.
  • Label: roof_rails

Windshield

  • Includes wipers.
  • Label: windshield

Bonnet

  • Starts below the windshield and ends at the headlights.
  • Label: bonnet

Headlights & Fog Lights

  • Follow edges of headlights.
  • Label: head_light
  • If fog lights are present, use head_light with group ID

Front Bumper

  • Starts below the bonnet, does not include main headlights, includes grille and fog lights.
  • Label: bumper

Fender

  • Covers wheel well, from hood to door.
  • Label: fender

Quarter Panel

  • Located between rear bumper and rear door.
  • Label: quarter

Trunk

  • Excludes rear windshield and main taillights.
  • Label: trunk

Rear Windshield

  • Includes glass, rubber supports, and rear wiper.
  • Label: windshield

Rear Bumper

  • Starts from the bottom of the trunk.
  • Label: bumper

Alloy (Wheel Rim)

  • Circular outer part of the wheel.
  • Label: alloy

Sill (Rocker Panel)

  • Underneath doors, between front and rear wheels.
  • Label: sill

Foot Rest

  • If present, follow its edges.
  • Label: foot_rest

Bumper Guard

  • Aftermarket accessory to protect bumper.
  • Label: bumper_guard

Car Panel Labels List

  1. bonnet
  2. bumper
  3. head_light
  4. head_light(1)
  5. alloy
  6. fender
  7. windshield
  8. screen_pillar
  9. roof
  10. roof_rails
  11. F_door
  12. R_door
  13. Fd_window
  14. Rd_window
  15. quarter_window
  16. sill
  17. foot_rest
  18. quarter
  19. trunk
  20. tail_light
  21. tail_light(1)
  22. bumper_guard

Car Damage Labels

Rules for Annotating Damages

  • Use a polygon to follow the actual damage shape.
  • If multiple damages exist in the same location, annotate all applicable labels.
  • If the damage is from a medium to extreme accident, only use the accident label.

Damage Types and Labels

  1. Dent – Visible depression due to impact.
  2. Scratch – Surface mark caused by a sharp object.
  3. Lamp Damage
    • Headlight_damage
    • Taillight_damage
    • Indicators_damage
  4. Panel Displaced – If panel gaps are larger than usual.
  5. Glass Impact – Cracks or broken glass.
  6. Accident – Damage from medium to heavy collision.
  7. Hole – Circular hole caused by sharp objects.
  8. Tear – Irregular-shaped hole.
  9. Abrasion – Surface scraping or rubbing.
  10. Paint Damage – Corrosion, peeling, or worn-out Teflon.
  11. Dust – Clay, mud, grease, or dust accumulation.

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