IMPROVING AUTOMOTIVE INSPECTION WITH LIGHT & COLOR MEASUREMENT SYSTEMS

Transcription

1 IMPROVING AUTOMOTIVE INSPECTION WITH LIGHT & COLOR MEASUREMENT SYSTEMS Matt Scholz, Radiant Vision Systems February 21,

2 TODAY S SPEAKER Matt Scholz Business Leader, Automotive Matt Scholz is the Automotive Business Leader for global automotive projects at Radiant Vision Systems. Having spent close to 10 years working on automotive metrology applications, Matt has a strong and fundamental understanding of the growing challenges faced by this industry for increased control in lighting and illuminated components, cross-component harmonization, display quality, and manufacturing integrity. Matt has worked with all levels of the automotive supply chain, from Tier 1,2, and 3 vendors to major brands and OEMs worldwide. As the company s dedicated liaison for the industry, Matt strives to build on Radiant s success by sharing his expertise on measurement equipment and providing a consultative approach to system integration for varying automotive applications. 2

3 AGENDA Who Is Radiant Vision Systems? Light & Color Measurement What are Imaging Photometers and Colorimeters? How are they different from standard machine vision cameras? Applications for Automotive Testing How to Select an Imaging System Conclusion 3

4 ABOUT RADIANT VISION SYSTEMS Designs, manufactures, and sells scientificgrade CCD imagers that automate visual defect detection in displays and lighting applications Imaging systems uniquely capable of in-line quality control for light and color analysis Global leader in automated display testing Expertise in high-end consumer electronics, which is extended to automotive components Headquartered in Redmond, WA, USA, with offices in Shanghai, Shenzhen, and Seoul Acquired by Konica Minolta in August

5 LIGHT & COLOR MEASUREMENT 5

6 AUTOMATING HUMAN VISUAL PERCEPTION Radiant imaging systems replicate and quantify human perception of and color 6

7 WHAT ARE IMAGING PHOTOMETERS AND COLORIMETERS? CCD-based camera systems calibrated with unique optical filter system to replicate the human eye s response to light Designed to make precise spatial measurements of luminance (brightness) and chromaticity (color) Extremely high resolution and high dynamic range to detect subtle variances in light and contrast Turnkey systems used from R&D to production to measure light and inspect features 7

8 QUANTIFYING HUMAN INSPECTION Human Inspection Pros: Visual acuity Detect & classify unpredictable defects Cons: Inconsistent Results not quantified Easily fatigued Machine Vision Pros: Qualitative results Consistent, repeatable Cons: Limited visual acuity Defects must be preprogrammed Incapable of providing absolute photometric data Photometer/Colorimeter 8

9 ADVANTAGES OVER STANDARD MACHINE VISION Machine Vision Camera Inspect for 2D pixel contrast and color thresholds Use static tolerances defined in software for defect determinations Provide relative data to each inspection Speed favored over resolution (limited detail inspection) Poor uniformity analysis (can t detect unknown defects in unknown locations) Photometer/Colorimeter Measure luminance & chromaticity values Optical filters simulate human perception of light & color for detail-level quality determinations Provide absolute data through NIST calibration Extremely high resolution and dynamic range for sub-pixel defect measurement Detect and classify unpredictable defects like display mura, scratches, dents or other anomalies 9

10 APPLICATIONS FOR AUTOMOTIVE TESTING In-Vehicle Displays Instrument Panels Head-Up Displays Interior Lighting Exterior Lighting Materials & Finishes 10

11 IN-VEHICLE DISPLAYS 11

12 IN-VEHICLE DISPLAYS Key Measurement Applications Luminance & Chromaticity Contrast Measurement Pixel Defects Mura Detection Viewing Angle Performance 12

13 COMMON DISPLAY TESTS Lv Brightness Offset Color Offset Non-Uniformity (Color & Brightness) Pixel & Line Defects Light Leakage Mura Image Sticking Viewing Angle 13

14 DISPLAY MURA TESTING Isolate different types of Mura Score the different Mura Pass/Fail based on defined Mura type or severity tolerances

15 INSTRUMENT PANEL HARMONIZATION 15

16 INSTRUMENT PANEL HARMONIZATION Key Measurement Applications: Indicator, Tell-Tale, and Control Component Uniformity Luminance & Chromaticity Dominant Wavelength 16

17 MEASURING TELL-TALES AND INDICATORS Image of dash with indicators and tell-tales (set the scene) possible add a failed value 17

18 PRODUCT SPOTLIGHT: AUTOMATIC POINTS OF INTEREST 18

19 DRAWING POI COMPARISON Traditional Method: Static POI Radiant Method: Auto-POI 19

20 MOVING POI COMPARISON Traditional Method: Static POI Radiant Method: Auto-POI 20

21 CHANGING POI COMPARISON All red symbols. All red symbols. Traditional Method: Static POI Radiant Method: Auto-POI 21

22 CHANGING POI COMPARISON All yellow symbols. All yellow symbols. Traditional Method: Static POI Radiant Method: Auto-POI 22

23 CHANGING POI COMPARISON All symbols at once. All symbols at once. Traditional Method: Static POI Radiant Method: Auto-POI 23

24 PASS/FAIL CRITERIA: COLOR REGION Define color region pass/fail criteria beyond simple minimums and maximum of CIE x,y or CIE u v. Users can define regions for any color across a wide variety of instrument clusters and manufacturers. Region Types: Rectangle Ellipse Polygon 24

25 HEAD-UP DISPLAYS (HUDS) 25

26 HEAD-UP DISPLAYS (HUDS) Key Measurement Applications: Luminance & Chromaticity Image Location on Infinite Plane Distance, size, scale of image Testing in Nighttime, Normal, Daytime Settings 26

27 INSPECT ON AN INFINITE PLANE Locate images despite undefined focal distance Electronically-controlled lens Evaluate light and color of the projected image and display Ensure uniformity and safety requirements are met in any daylight conditions 27

28 INTERIOR LIGHTING AMBIENT LIGHTING, MAP LIGHTING 28

29 INTERIOR LIGHTING Key Measurement Applications: Luminance Intensity Distribution Pattern As a function of distance or angle Luminance & Chromaticity Uniformity & Harmonization 29

30 THE IMPORTANCE OF LIGHT & COLOR HARMONIZATION More than a means to an end; cars have become an experience Brand perception, safety, and even psychology are impacted by perceptions of light Inspections must be reproducible for all lights, and offer absolute data Map lighting, floor lighting, door panel lighting, graphical lighting applications 30

31 EXTERIOR LIGHTING HEADLAMPS, TAIL LIGHTS, TURN SIGNALS 31

32 EXTERIOR LIGHTING Key Measurement Applications: Light Source Characterization Luminous Intensity Distribution Patterns and Limits Illumination Distribution 32

33 PRODUCT SPOTLIGHT: PM-HL SOFTWARE 33

34 MATERIALS & FINISHES 34

35 MATERIALS & FINISHES Key Measurement Applications: Surface Attribute Measurement Color, finish, reflection Surface Defect Detection 35

36 INSPECTION OF MATERIALS & FINISHES Photometers and colorimeters: The highest resolution/ dynamic range to detect the most subtle/low contrast defects Characterize surface finish: Matte, glossy Translucent, opaque Color Detect surface scratches, dents, and other inconsistencies 36

37 HOW TO SELECT AN IMAGING SYSTEM + What Are Your Requirements? Color Camera Resolution Lens Software Capability Integration/Fixture Configurations 37

38 SUMMARY Imaging photometers and colorimeters have significant advantages over standard machine vision cameras for light & color measurement and fine-detail inspection With quantifiable inspection data based on human visual perception, process improvements can be driven to ensure quality that accurately reflects customer experience Imaging photometers and colorimeters meet a range of automotive test applications; one system can accomplish multiple applications 38

39 THANK YOU! Learn more at Questions? Contact Matt Scholz at: 39