automated head-up display measurement · capturing and quantifying multiple data points. radiant...
TRANSCRIPT
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RadiantVisionSystems|AKonicaMinoltaCompanyRadiantVisionSystems|AKonicaMinoltaCompanyPresented by: | Date:AUTOMATED HEAD-UP DISPLAY MEASUREMENT
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2Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
TODAY’S TOPICS
• SAE Standards for Head-Up Displays• SAE J1757-2
• Measurement Requirements
• Technology to Enable Automation:• Electronically-Controlled Lens
• Line-Pairing Algorithm
• Full Field-of-View Imaging
• Multi-Test Sequencing Software
• Software Tests: TT-HUD Module
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3Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
2 – 29 MP CCD / Cooled / Temp. Stabilized
CIE Matched Color Filters
Electronic ND Filter Selection (colorimeter)
Electronic Lenses
On-Camera Calibration Data
USB & Ethernet Control
On-camera Touch Control (colorimeter)
• Auto-Lens Recognition• Electronic Zoom control• Electronic Aperture
selection• Auto-selection of
Calibration Data
IMAGING COLORIMETERS/PHOTOMETERS
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4Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
SAE STANDARD HUD MEASUREMENTBACKGROUND AND REQUIREMENTS
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5Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
HUD MEASUREMENT STANDARDS
Radiant has worked with SAE Committee to define new HUD Standard
§ SAE J1757-2 (WIP)§ “Optical Metrology for
Automotive HUD”
§ Imaging photometers implemented into the standard as a primary solution for HUD testing
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6Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
REQUIREMENTS FOR SAE STANDARD MEASUREMENT DEVICES
Optical meter camera § Measure luminance, chromaticity, uniformity§ NIST-traceable§ Example: Photometer
Distance meter§ Measure geometrical distance, direction,
angle, distortion§ Example: Smart Camera
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7Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
KEY HUD MEASUREMENT CHALLENGES
• Virtual image location and size
• Image resolution and contrast accuracy
• Number of tests and parameters per test image
• Enabling production-level automated measurement
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8Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
USING AN ELECTRONICALLY-CONTROLLED LENSGAUGING VIRTUAL IMAGE SIZE AND LOCATION
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9Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
Is the virtual image projected at the right location and at the correct size ?
HUD
LOOK DOWN ANGLE (a)
PROJECTION DISTANCE
SIZE
VIRTUAL IMAGE
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10Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
VIRTUAL IMAGE
PROJECTION DISTANCE = FOCAL DISTANCE
DEPTH OF FOCUS (DOF)
• Convert focal distance to “real distance” units
• Using focal distance, and virtual image size, the distance of the projected image can be output automatically by software
MEASURING PROJECTION DISTANCE
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11Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
OPTIMIZING FOCUS
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12Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
OPTIMIZING FOCUS
Out of Focus Better Focus Best Focus
Notice: Increasing slope on cross section plot (corresponding to decreasing blue region (between 10% and 90% of max grey value). Increasing focus bar (orange)
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13Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
Calibrated cameras provide absolute distance measurements
Electronically-controlled lenses determine projected image plane
§ Remove human calculation, error
§ Reduce time to set up measurements
CALCULATING ABSOLUTE MEASUREMENTS
f1
f2
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14Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
Calibrated cameras provide absolute distance measurements
Electronically-controlled lenses determine projected image plane
§ Remove human calculation, error
§ Reduce time to set up measurements
CALCULATING ABSOLUTE MEASUREMENTS
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15Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
DEPTH OF FOCUS
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16Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
LINE-PAIRING ALGORITHMSQUANTIFYING MODULATION FOR RESOLUTION AND CONTRAST OF PROJECTIONS
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17Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
HUD PROJECTOR (DLP) STRUCTURE
HUD
VIRTUAL IMAGE
CAMERA IN THE “EYE BOX”
DLP STRUCTURE
HUD Optics
DLP Optics D
MD
HUD Electronics
Source Image
Projected Image
Picture Generating Unit (PGU)
HUD Box
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18Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
PRESERVING IMAGE CLARITY
DMD
Micro-mirror array
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19Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
TESTING FOR MODULATION
Modulation = value that describes resolution + contrast
Modulation Transfer Function (MTF) determines the level of spatial frequency between contrasting areas
Testing is done using projections of horizontal and vertical pairs of black and white lines
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20Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
LINE-PAIRING ALGORITHM
Line-pairing algorithms quickly measure modulation between vertical and horizontal line pairs
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21Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
FULL FIELD-OF-VIEW IMAGINGCAPTURING AND QUANTIFYING MULTIPLE DATA POINTS
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22Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
REDUCE SETUP & MEASUREMENT TIME
Spot-based measurement requires multiple test points
Image-based measurement captures all data at once
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23Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
ACCOMPLISH MULTIPLE MEASUREMENTS AT ONCE
Required measurements for SAE J1757-1:
§ Uniformity§ Contrast§ Pixel count resolution§ Location / Size§ Ghosting§ Distortion / Alignment§ Modulation Transfer Function
(MTF) Measurement sequences performed on a single image by software paired with imaging solution
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24Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
OBTAIN DATA BASED ON CONTEXT
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25Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
INTRA-CHARACTER UNIFORMITY
Spot meter takes single-spot measurements at defined points.
Imaging enables software to measure entire symbol at once.
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26Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
• Quickly determine, Lv, Cx, Cy, pixel count, and much more.
• Run specific user-based pass/fail criteria against each analysis requirement
INTER-CHARACTER UNIFORMITY
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27Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
PIXEL RESOLUTION OF SYMBOLS
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28Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
CONTRAST
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29Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
GHOSTING
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30Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
DISTORTION
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31Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
TESTING FOR GHOSTING & DISTORTION
Test Pattern Measurement Image
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32Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
MULTI-TEST SEQUENCING SOFTWAREAUTOMATING TEST AND MEASUREMENT
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33Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
PRODUCTION-LEVEL MEASUREMENT
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34Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
SOFTWARE TEST SEQUENCING
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35Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
TESTS IN TRUETEST™ TT-HUD MODULE
Test Color? Pattern(s)
ANSI Brightness Photopic White 255, or desired pattern
Uniformity Color White 255
Diagonal Checkerboard Photopic Diagonal Checkerboard
Distortion Grid Photopic Grid (Dot and Line)
Warping Photopic Grid
Sequential Contrast Photopic Black, White; Checkerboard, Inverse Checkerboard
Eye Box Photopic Target
MTF Line Pair Photopic Line pairs (1 pixel, 2 pixel, etc)
Image Sticking Photopic Black, or low grey level
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36Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
ANSI BRIGHTNESS
This test averages the measured brightness of an image at the ANSI-9 points and compares these values against various Pass/Fail criteria.
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37Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
UNIFORMITYCreates NxN grid on image, and reports out average luminance of each grid point, as well as additional statistics (min, max, difference, etc.)
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38Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
DIAGONAL CHECKERBOARD CONTRAST
Places detectors on the black and white diamonds, reports the luminance values, calculates average black and white luminance, and reports ratio between the average black and white luminance.
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39Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
DISTORTION GRID
Reports out the position of each grid point, and in addition can measure the distance between points and pass/fail on this value.
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40Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
DISTORTION LINE GRID
Analysis finds the points where lines of a test image intersect and reports their location. Can also pass or fail a device based on the spacing of the intersection points of the pattern.
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41Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
WARPING
Test image has a white square directly in the center of the pattern. The analysis locates the white squares and reports the distance the center square to every other square.
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42Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
SEQUENTIAL CONTRAST
Takes measurement of Black, and White patterns. Compares luminance values of the entire image. Computes contrast ratio.
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43Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
EYEBOX
Looks for a continuous shape with no breaks. The line width is specified in the analysis for pass/fail.
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44Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
MTF LINE PAIRS
Measures the MTF of the line pairs in the image, reporting out the contrast of each region. The regions can be user defined (as shown) or a default can be used.
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45Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
IMAGE STICKING
A checkerboard pattern is used for the initial burn in, then a low grey level image is used. The analysis takes multiple images of the display over a user-specified time interval. The images are analyzed to determine the strength of the burn in pattern.
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46Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
ENABLING FULLY-AUTOMATED TESTING
HUD
VIRTUAL IMAGE
CAMERA IN THE “EYE BOX”
SERIES OF TEST IMAGESFOR EACH HUD TESTED
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47Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
SUMMARY
ü SAE J1757-2 standard will specify measurement devices for HUD evaluation
ü HUD measurement can be most efficiently met using systems with:
ü Electronically-controlled lenses for simplified image location
ü Built-in software algorithms for calculating Modulation Transfer Function (MTF) for visual image resolution and contrast
ü Imaging capability and multi-test sequencing software for meeting the maximum measurement criteria at once
ü Using these systems can enable fully-automated HUD measurement for application in production
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48Radiant Vision Systems | A Konica Minolta Company
© Radiant Vision Systems, LLC.
Working closely with world class brands and manufacturers to deliver creative visual inspection solutions that improve
quality, reduce costs, and increase customer satisfaction.
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