Next Generation of Human Eye Simulator Prevents Eye Tracker Failures by Eliminating Unwanted Reflections with New IR Filter

Almalence introduces the next generation of its Human Eye Simulator, now making the simulator look exactly like a human eye by completely eliminating the unwanted pupil reflections in the IR specter.

A closer look at the evolution of how Almalence Human Eye Simulator looked like to the eye trackers in IR specter:

First generation:

In this IR capture from an eye-tracking camera, you can see the nicely defined glints. These are produced by eye-tracking system IR projectors and reflect off the synthetic cornea.

You can, however, also see some internal structure within the eye pupil. That structure is in fact the camera lens inside the eye simulator. Its presence in the captured image can distract the eye-tracking system. A real eye has no internal structures visible under IR illumination.

Second generation:

In the next generation of the Simulator, Almalence took care of the above issue by adding a conventional IR-cut filter.

Such filters are commonly sandwiched between the lens and the image sensor in digital cameras to prevent IR illumination to which the digital sensors are sensitive. The IR component of the light presents under some lighting conditions, and if not filtered out results in incorrect colors in the captured image.

Adding the IR filter to the Simulator worked very well for concealing the internal lens structure behind the pupil. Another issue remained though: under specific relative orientations of the simulated eye to the eye-tracking system, the surface of the filter was now producing a reflected image of the eye-tracking system itself.

In the image above, captured by an eye-tracker camera, you can see a reflection of that camera and its lens as well as the white background behind it.

Third generation:

In the third generation of the Simulator we implemented a custom-designed, non-flat, non-reflecting IR filter, achieving two major improvements over the previous design:

  1. No unwanted reflections inside the pupil, regardless of the simulator orientation.
  2. The non-flat surface has improved the overall MTF of the system and eliminated the unwanted reflections of the light from the IR LEDs that appear at some specific orientations and would blind the eye-tracking system.

With the design improvements made in the third generation Eye Simulator, Almalence achieved its robust operation and eliminated eye-tracking failures across all possible eye orientations and gaze angles, making the Simulator the ultimate solution for image capturing, optical profiling, and quality measurement of VR/AR head-mounted displays equipped with eye-tracking.

An ideal imitation of the human eye enables the precise measurement of near-eye and head-mounted display quality

The all-new 2021 version of the Almalence Human Eye Simulator. Optically clear. Eye Tracking ready.

To assess the quality of head-mounted displays, it is necessary to capture images which exactly match with what a human eye would perceive. Indeed, a capturing device has to be capable of accurately replicating the human eye’s optical properties. If they are not, then this could lead to some drastic irregularities – a mismatch of entrance pupil diameter, for instance, would lead to quite different blurs and aberrations, or even sometimes visible Fresnel rings, which are not apparent to the human eye. Once you do have a capturing device in place that can match the optical properties of the human eye, however, then now comes the real challenge: the device has to be recognized as an “eye” by eye trackers – otherwise, there will simply be no chance of capturing a correct picture, as a wrong picture would be displayed in the first place, in case the HMD uses eye position-dependent rendering techniques like foveated rendering or dynamic aberrations correction – which have recently been becoming standard for high-quality near-eye displays.

Almalence, a pioneer in designing the eye-imitating cameras, has now begun to roll out an all-new and updated version of its powerful eye simulator, better than ever and ideally suited for near-eye display picture capturing and quality measurement tasks. It features made-to-order, optically clear eye corneas, flawlessly creating a perfect match to the form of a real, human eye that is indistinguishable for eye trackers – unlike other, off-the-shelf parts and solutions, which commonly result in deviations from the proper shape. A clear aperture for up to a 120° FOV enables the seamless capture of up to the entire field of view in one shot, without ever compromising the contrast and MTF of the true visible picture.

The ideal profile of both visible and IR light absorption and reflection is painstakingly implemented, in order to make the simulator’s iris look exactly like a natural iris to an eye tracker. An additional IR-cut filter also prevents unwanted reflections from the camera lens, which may spoof eye tracker readings.

Auto-focus capability, to avoid having to manually adjust the focal point when moving the “eye” inside head-mounted displays that exhibit a significant field curvature.

The platform encapsulates multiple capturing camera designs, including a 100° field of view camera which enables the user to capture the entire visible FOV in one shot. This feature is also quite useful for geometry distortion measurements. Specially designed narrow 78- and 34-degree FOV cameras are also included, engineered for high-precision optical measurements, including apparent resolution, chromatic aberrations, and more.

A monochromatic camera can also optionally be used with the eye simulator, in order to resolve ambiguity in color channel mixing between the HMD display and CFA filters inside the camera.

Almalence has also developed a powerful software for the processing and transforming of captured images, so that they can readily be used for correct measurements of geometry, MTF, channel crossing, and other quality characteristics, with industry-standard tools such as ImaTest. Together with a 6-DOF robo-arm and its controlling software, all of the above-mentioned features seamlessly combine to present a complete, easy-to-implement tool for head-mounted displays, picture quality assessment, and the profiling of geometry and aberrations correction.

xTeleZoom extends the lossless zoom range of iPhone 7+ dual camera

Computational imaging technology increases the resolution and enables high quality zoom beyond iPhone 7+ 2x telephoto camera hardware.

February 27, 2017. Barcelona.
Today at Mobile World Congress, Almalence, the leader in computational imaging technologies announced its xTeleZoom app for the iPhone, enabling extra high quality zoom capability. Using a sophisticated computational technique, the app is able to dramatically preserve resolution and suppress the noise while zooming.

Mobile phone photography is still limited in its ability to zoom in without sacrificing resolution and image detail. While there is no practical way to create an optical zoom solution in mobile form factor constraints, the phone makers, including Apple, add an extra telephoto camera to their devices to provide good zoom quality. This approach, however, is able to provide only a limited optical zoom factor as the longer focal length lenses in mobile size constraints suffer from decreased aperture, resulting in low resolution and high noise level.

“We developed xTeleZoom because even the most advanced hardware solutions alone cannot address the need for taking high quality zoom photos”, said Eugene Panich, CEO of Almalence. “The decreasing thickness of new phone generations poses bigger challenges on the lenses ability to zoom and resolve good image quality. Software like xTeleZoom is the only practical way to break the zoom quality barrier”.

Almalence’s xTeleZoom uses computational imaging technology that enables better zoom shots from the iPhone without compromised image quality. Originally developed for professional photography it’s now available as an iPhone app to extend the high quality zoom range of the telephoto camera of the iPhone 7+. The users of the iPhone 6, iPhone 6s and iPhone 7 models without a tele camera will also benefit from higher quality zoom using the xTeleZoom app.

xTeleZoom is available on iTunes for $.99:

xTeleZoom enables lossless zoom for iPhone

About Almalence
Almalence, an Intel Portfolio Company, is the global leader in computational imaging technologies used in a wide range of optical systems from high-end DSLR cameras to mobile phones. Almalence’s solutions are licensed by top smartphone OEMs. Almalence Inc. is a privately owned company with headquarters in Austin, Texas and the team distributed across the world – USA, Russia, Israel, China, and South Korea. For more information about Almalence technologies please visit

Almalence’s new technology makes cameras see like human eye

Have you ever noticed that you see much more details when looking at a scene by eye than when seeing a photo of the same scene? If not, it’s just because it’s too common to be noticed. Even having, physically, a lower dynamic range than a camera, human eyes see more.

Almalence Dynamic Range Optimizer optimizes the usage of dynamic range of 8-bit images to make the most of image details visible. DRO uses a technique similar to tone mapping, exploiting the peculiarities of human vision. DRO can be used either for optimal conversion of RAW images into 8-bit RGB/YUV images or for improvement of existing 8-bit images.

Almalence Dynamic Range Optimizer reveals details in highlights and shadows. Automatic processing within milliseconds.

Same data acquired by the camera, different usage of dynamic range. Left: standard image produced by the camera. Right: result of Almalence DRO processing, close to what human eye would see. Details in shadows are revealed due to optimization of dynamic range usage. Noise is not amplified.

DRO is easy-to-integrate, extremely fast solution that automatically improves the images in 100% cases and can substitute HDR in most of cases.

Comparing to existing solutions aiming to provide similar improvements of digital imaging, Almalence DRO:

  • is faster by the order of magnitude, which allows to use it in mobile devices, for both still images and video
  • provides better quality, mainly due to absence of noise amplification in shadows
  • improves both shadows and highlights

Details in shadows are revealed due to optimization of dynamic range usage. Noise is not amplified.

Left: standard image, right: DRO processed (optimized) image. Details in both shadows and highlights are revealed due to optimization of dynamic range usage.

DRO can be integrated in ISP, camera drivers or applications.

Some comparison examples are available on our site: (33 MB)

Demo application is available upon request.

A Better Camera: alpha testers wanted!

For years we’ve been providing you with the most advanced imaging applications for Android. Now we have fused all our applications into a single multi-purpose camera app.

Moreover, we have made this application open source so that it should be backed with the power of Android developers community!

We are excited to invite you to become an tester of a very early alpha version of the application.

See the details on A Better Camera site

Superb quality zoom with newly available Huawei Ascend P2, first tests at MWC 2013

Camera became one of the things (if not the only one) that really make the difference in modern smartphones. Among the leading OEMs such as HTC, Sony and Intel who emphasize their new advanced camera features, Huawei offers something really unique – SuperZoom feature, allowing to take high quality images when zooming in with a mobile phone camera.

We had a chance to test SuperZoom feature with Huawei Ascend P2 phone at Huawei’s stand at Mobile World Congress. In brief, it works incredibly, see the pictures below.

Comparison: SuperZoom vs normal zoom, Huawei Ascend P2

Left: normal zoom, right: Super Zoom

SuperZoom versus ordinary zoom comparison, Huawei Ascend P2

Left: generic digital zoom, right: SuperZoom

Comparison: Super Zoom versus generic zoom, Huawei P2

Left: ordinary zoom, right: Super Zoom

SuperZoom on Huawei P2, sample image, test against usual zoom

Left: usual zoom, low detail; right: Super Zoom, high resolution and lot of details

Conclusion: SuperZoom is a revolutionary technology providing zoom quality comparable to optical zoom, on mobile devices!

Feb 25, 2013, Barcelona.

Almalence releases an accessible HDR tool for converting RAW into detail-rich vivid images

Your camera captures the details, HDRAW makes them visible

Tone Mapped RAW versus JPEG: JPEG has less details due to squeezing and cutting of dynamic range

The maximal dynamic range – the contrast between the brightest point and the darkest one – of a JPEG image is about 4,000 times lower than the range seen by a human eye. A camera captures several times higher dynamic range than one available with JPEG. This means that the range is either cut or squeezed in JPEG photos, therefore in high contrast scenes the details in highlights and shadows are lost, as well as the details of low-contrast objects. RAW images still contain the full dynamic range captured by the camera.

HDRAW utilizes Tone Mapping technique, allowing to preserve the details while fitting high dynamic range image into the limited dynamic range of JPEG or any other 8-bit format. Exploiting the properties of the human vision, HDRAW makes the picture and color details visible in all areas of the photo from the darkest to the brightest one.

Single-image HDR

HDRAW is a single-image HDR tool that utilizes higher dynamic range available in RAW.

RAW made easy

While usual RAW development process is a sophisticated task that requires adjusting a lot of parameters in a RAW converter, HDRAW is intended to produce rich detail images virtually in one click (ok, three clicks actually). It still allows you to adjust tone mapping parameters, but the standard presets are enough in most cases.

Along with HDRAW application we’ve launched community for photo sharing, discussions, etc.

HDRAW is available at introductory price of $14.99. Registered users of PhotoAcute can use HDRAW for free – HDRAW accepts PhotoAcute 3 registration codes.

RAW converted with HDRAW versus JPEG: JPEG has less vivid colors and less details visible