FOUR WAYS TO ENABLE AUTOMATED SAE STANDARD HUD … · Presented By Matt Scholz | October 25, 2017 Radiant Vision Systems | A Konica Minolta Company FOUR WAYS TO ENABLE AUTOMATED SAE

Radiant Vision Systems | A Konica Minolta CompanyRadiant Vision Systems | A Konica Minolta CompanyPresented By Matt Scholz | October 25, 2017

FOUR WAYS TO ENABLE AUTOMATED SAESTANDARD HUD MEASUREMENT

Global SupportAutomated Visual InspectionLight & Color

3Radiant Vision Systems | A Konica Minolta Company

© Radiant Vision Systems, LLC.

TODAY’S AGENDA

• SAE Standards for Head-Up Displays

• Issued Nov. 2018: SAE J1757-2

• Measurement Requirements

• Technology to Enable Automation:

• Electronically-Controlled Lens

• Line-Pairing Algorithm

• Full Field-of-View Imaging

• Multi-Test Sequencing Software

• Question & Answer Session



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



SAE STANDARD HUD MEASUREMENTBACKGROUND AND REQUIREMENTS



HUD MEASUREMENT STANDARDS

Radiant has worked with

SAE Committee to define

new HUD Standard

▪ SAE J1757-2

▪ “Optical System HUD for

Automotive”

▪ Imaging photometers

implemented into the

standard as a primary

solution for HUD testing



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



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



USING AN ELECTRONICALLY-CONTROLLED LENSGAUGING VIRTUAL IMAGE SIZE AND LOCATION



Is the virtual image projected at the right location and at the correct size ?

HUD

LOOK DOWN ANGLE ()

PROJECTION DISTANCE

SIZE

VIRTUAL IMAGE



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



OPTIMIZING FOCUS



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)



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



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



DEPTH OF FOCUS



LINE-PAIRING ALGORITHMSQUANTIFYING MODULATION FOR RESOLUTION AND CONTRAST OF PROJECTIONS



HUD PROJECTOR (DLP) STRUCTURE

HUD

VIRTUAL IMAGE

CAMERA IN THE “EYE BOX”

DLP STRUCTURE

HUD Optics

DLP Optics

DM

D

HUD Electronics

Source Image

Projected Image

Picture Generating Unit (PGU)

HUD Box



PRESERVING IMAGE CLARITY

DMD

Micro-mirror array



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



LINE-PAIRING ALGORITHM

Line-pairing algorithms quickly measure modulation between vertical and horizontal line pairs



FULL FIELD-OF-VIEW IMAGINGCAPTURING AND QUANTIFYING MULTIPLE DATA POINTS



REDUCE SETUP & MEASUREMENT TIME

Spot-based measurement requires multiple test points

Image-based measurement captures all data at once



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



OBTAIN DATA BASED ON CONTEXT



INTRA-CHARACTER UNIFORMITY

Spot meter takes single-spot measurements at defined points.

Imaging enables software to measure entire symbol at once.



• Quickly determine, Lv, Cx, Cy, pixel count, and much more.

• Run specific user-based pass/fail criteria against each analysis requirement

INTER-CHARACTER UNIFORMITY



PIXEL RESOLUTION OF SYMBOLS



CONTRAST



GHOSTING



DISTORTION



TESTING FOR GHOSTING & DISTORTION

Test Pattern Measurement Image



MULTI-TEST SEQUENCING SOFTWAREAUTOMATING TEST AND MEASUREMENT



PRODUCTION-LEVEL MEASUREMENT



ENABLING FULLY-AUTOMATED TESTING

HUD

VIRTUAL IMAGE

CAMERA IN THE “EYE BOX”

SERIES OF TEST IMAGESFOR EACH HUD TESTED



SOFTWARE TEST SEQUENCING



SUMMARY

✓ SAE J1757-2 standard specifies measurement devices for HUD evaluation

✓ HUD measurement can be most efficiently met using systems with:

✓ Electronically-controlled lenses for simplified image location

✓ Built-in software algorithms for calculating Modulation Transfer Function (MTF) for visual image resolution and contrast

✓ Imaging capability and multi-test sequencing software for meeting the maximum measurement criteria at once

✓ Using these systems can enable fully-automated HUD measurement for application in production

Radiant Vision Systems | A Konica Minolta CompanyRadiant Vision Systems | A Konica Minolta CompanyQuestions? Contact [email protected]

THANK YOU!

mailto:[email protected]

FOUR WAYS TO ENABLE AUTOMATED SAE STANDARD HUD … · Presented By Matt Scholz | October 25, 2017 Radiant Vision Systems | A Konica Minolta Company FOUR WAYS TO ENABLE AUTOMATED SAE

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