improving automotive inspection with light ......2017/02/21 · absolute data through nist...

1S E E T H E D I F F E R E N C E© 2017 Radiant Vision Systems, LLC. All Rights Reserved.Improving Automotive Inspection with Light and Color Measurement Systems

IMPROVING AUTOMOTIVE INSPECTION WITH LIGHT & COLOR MEASUREMENT SYSTEMS

Matt Scholz, Radiant Vision Systems | February 21, [email protected]

mailto:[email protected]


TODAY’S SPEAKER

Matt ScholzBusiness 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.


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


• Designs, manufactures, and sells scientific-grade 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 2015

ABOUT RADIANT VISION SYSTEMS


LIGHT & COLOR MEASUREMENT


AUTOMATING HUMAN VISUAL PERCEPTION

Radiant imaging systemsreplicate and quantify human perception

of and color


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


Machine Vision

Human Inspection

QUANTIFYING HUMAN INSPECTION

Pros:• Visual acuity• Detect & classify

unpredictable defectsCons:• Inconsistent• Results not quantified• Easily fatigued

Pros:• Qualitative results• Consistent, repeatableCons:• Limited visual acuity• Defects must be pre-

programmed• Incapable of providing

absolute photometric data

Photometer/Colorimeter


ADVANTAGES OVER STANDARD MACHINE VISION

• 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)

• 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

Machine Vision Camera Photometer/Colorimeter


Head-Up DisplaysInstrument PanelsIn-Vehicle Displays

Materials & FinishesInterior Lighting Exterior Lighting

APPLICATIONS FOR AUTOMOTIVE TESTING


IN-VEHICLE DISPLAYS


IN-VEHICLE DISPLAYS

Key Measurement Applications

• Luminance & Chromaticity• Contrast Measurement• Pixel Defects• Mura Detection• Viewing Angle Performance


Non-Uniformity (Color &

Brightness)

Pixel & Line Defects

Mura Image Sticking Viewing AngleLight Leakage

Color OffsetBrightness Offset

Lv

COMMON DISPLAY TESTS


• Isolate different types of Mura

• Score the different Mura

• Pass/Fail based on defined Mura type or severity tolerances

4 8

8 7

DISPLAY MURA TESTING


INSTRUMENT PANEL HARMONIZATION


INSTRUMENT PANEL HARMONIZATION

Key Measurement Applications:

• Indicator, Tell-Tale, and Control Component Uniformity

• Luminance & Chromaticity• Dominant Wavelength


MEASURING TELL-TALES AND INDICATORS• Image of dash with indicators and tell-tales (set

the scene) – possible add a failed value


PRODUCT SPOTLIGHT: AUTOMATIC POINTS OF INTEREST


DRAWING POI COMPARISON

Traditional Method: Static POI Radiant Method: Auto-POI


MOVING POI COMPARISON



CHANGING POI COMPARISON


All redsymbols.

All redsymbols.


All yellowsymbols.

All yellowsymbols.




All symbols at once.

All symbols at once.




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


HEAD-UP DISPLAYS (HUDS)


HEAD-UP DISPLAYS (HUDS)


• Luminance & Chromaticity• Image Location on Infinite Plane

• Distance, size, scale of image

• Testing in Nighttime, Normal, Daytime Settings


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


INTERIOR LIGHTINGAMBIENT LIGHTING, MAP LIGHTING


INTERIOR LIGHTING


• Luminance Intensity Distribution Pattern

• As a function of distance or angle

• Luminance & Chromaticity• Uniformity & Harmonization


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


EXTERIOR LIGHTINGHEADLAMPS, TAIL LIGHTS, TURN SIGNALS


EXTERIOR LIGHTING


• Light Source Characterization• Luminous Intensity Distribution

• Patterns and Limits

• Illumination Distribution


PRODUCT SPOTLIGHT: PM-HL SOFTWARE


MATERIALS & FINISHES


MATERIALS & FINISHES


• Surface Attribute Measurement• Color, finish, reflection

• Surface Defect Detection


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


HOW TO SELECT AN IMAGING SYSTEM

• Color• Camera Resolution• Lens

• Software Capability• Integration/Fixture

Configurations

+

What Are Your Requirements?


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


THANK YOU!Learn more at www.RadiantVisionSystems.com

Questions? Contact Matt Scholz at:[email protected]

http://www.radiantvisionsystems.com/

mailto:[email protected]

improving automotive inspection with light ......2017/02/21 · absolute data through nist...

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