Kedar Sathaye | KONICA MINOLTA SENSING EUROPE B.V.: How can an optical metrology system focus on virtual images spanning from meters to infinity?
00:09:28 - 00:11:50
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How can an optical metrology system focus on virtual images spanning from meters to infinity?
Augmented and virtual reality systems project virtual images across a wide, dynamic depth of field, requiring optical metrology systems with robust focusing capabilities. This segment introduces the XRE lens architecture, which combines a macro lens with an eyepiece to enable electronic focus control capable of tracking virtual images from two meters out to infinity.
Testing binocular and 3D visual systems also requires replicating how human vision fuses disparate images from the left and right eyes. To achieve this, advanced test configurations support dual-camera setups to simultaneously measure both optical paths, ensuring color, luminance, and focus uniformity are balanced across both channels.
To resolve pixel-level defects across wide fields of view, these systems pair their specialized front-aperture lenses with ultra-high-resolution sensors ranging from 29 to 61 megapixels. This ensures a high pixel-per-degree rating, matching or exceeding human visual acuity limits.
In this short video, you can learn:
* How electronic focus control enables precise metrology across vast virtual image distances
* The design and benefit of dual-eye measurement configurations for validating 3D binocular displays
* Why pairing front-aperture optics with 29-to-61 megapixel sensors is essential for high pixel-per-degree accuracy
š **Clip Abstract** Explore the design of the XRE lens solution, featuring electronic focus control and periscope or straight configurations for near-eye displays. Learn how dual-eye measurements and high-megapixel sensors work together to accurately evaluate 3D binocular visual systems.
#ElectronicFocusControl, #BinocularDisplayTesting, #PixelPerDegree, #FrontApertureOptics, #OpticalMetrology, #NearEyeDisplays
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00:00:47 - 00:02:00
How do imaging colorimeters achieve the spectral accuracy required to replicate human color perception?
How do imaging colorimeters achieve the spectral accuracy required to replicate human color perception?
To replicate and quantify human perception of brightness and color accurately, specialized imaging systems must use advanced filtration technologies. This segment explains how a tristimulus colorimeter utilizes a filter wheel based on the CIE tristimulus curves for X, Y, and Z, enhanced with a specialized XB filter to capture the smaller spectral components within the X function, significantly reducing measurement error.
Understanding the internal optomechanical anatomy of these imaging photometers is crucial for high-fidelity display analysis. The design integrates four primary modules: a field-of-view capturing objective lens, a high-precision tristimulus filter wheel, neutral density filters to expand the dynamic range, and a high-resolution CMOS or CCD imaging sensor.
By pairing these precise color matching functions with broad-spectrum neutral density filtration, these imaging colorimeters achieve absolute luminance and chromaticity measurement with high signal-to-noise ratios. This forms the baseline for metrology in high-density emissive displays such as MicroLEDs and OLEDs.
In this short video, you can learn:
* The role of CIE tristimulus (X, Y, Z) and XB filters in achieving high-accuracy color replication
* The physical layout of an imaging colorimeter, including optics, ND filters, and CMOS/CCD sensors
* How imaging colorimeters differ from photometers by providing absolute chromaticity data alongside luminance
š **Clip Abstract** Learn how Radiant Vision Systems replicates human color perception using an advanced tristimulus filter system. This clip details the internal optical stack of a high-resolution imaging colorimeter and explains how the addition of an XB filter improves measurement accuracy.
#TristimulusColorimetry, #CIETristimulus, #XBFilter, #DisplayMetrology, #MicroLEDDisplays, #OpticalMetrology
00:05:52 - 00:07:42
Why do standard camera lenses cause a "knot hole effect" when measuring near-to-eye displays?
Why do standard camera lenses cause a "knot hole effect" when measuring near-to-eye displays?
Testing near-to-eye displays presents unique optical challenges because traditional imaging lenses place their optical aperture deep inside the lens barrel. For an accurate measurement of what a user sees, the entrance pupil of the camera lens must be located externally at the front of the lens, matching the physical position of the human eye's pupil.
Using standard camera lenses leads to a severe optical limitation known as the knot hole effect. Because the aperture is buried inside, the display's field of view is artificially clipped, preventing the camera from capturing the full spatial extent of the projected augmented or virtual reality environment.
Furthermore, typical industrial lenses are too bulky to fit within the tight mechanical constraints of headset eye-relief distances. Replicating human vision requires specialized optics designed to position an external entrance pupil precisely at the headset's nominal eye position.
In this short video, you can learn:
* Why the internal aperture location of standard lenses causes the knot hole effect and clips the field of view
* The importance of positioning the camera's entrance pupil at the physical front of the lens stack
* How bulkiness and low spatial resolution limit standard optical test equipment in microdisplay metrology
š **Clip Abstract** Discover why conventional camera lenses are fundamentally unsuited for testing near-to-eye virtual and augmented reality displays. This clip details the optical physics behind the knot hole effect and outlines the necessity of front-aperture lens designs.
#KnotHoleEffect, #FrontApertureLens, #NearToEyeDisplayMetrology, #EntrancePupilMatching, #ARVROptics, #MicrodisplayMetrology