Imaging

Resource-Constrained Application of Support Vector Machines to Imagery

Fast computation of the SVM decision function over an image using minimal RAM. Machine learning techniques have shown considerable promise for automating common visual inspection tasks. For example, Support Vector Machine (SVM) classifiers that have been learned from labeled training data deliver strong detection performance both for finding human faces in photographs and locating geologic landforms such as craters and volcanoes in planetary images gathered by spacecraft. However, SVMs are computationally expensive to apply to an image using the traditional spatial scanning method in which a rectangular window is slid across the image one pixel at a time and the SVM is evaluated on each patch of pixels under the window. The new software uses small fast Fourier transforms (FFTs) and the overlap- and-add technique from signal processing to quickly and efficiently compute the exact SVM decision function over an entire image using minimal random access memory (RAM).

Posted in: Imaging, Briefs

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Improving Absorption Measurements through Light Source Selection

Stray light limits the maximum absorbance level achievable with a given spectrometer. Once the stray light limit is reached, sample dilution or a smaller pathlength is required to measure more concentrated samples. In this application note, we show the impact of stray light on the maximum absorbance level and describe how optimizing the choice of light source can minimize stray light and increase the maximum absorbance measured.

Posted in: Imaging, White Papers

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3D Visualization Technologies: Seeing a World of Opportunity

Industries as diverse as architecture, engineering, construction, advertising, and medical have all incorporated an array of 3D visualization technologies into their design, development, and production processes. A rapidly expanding library of 3D modeling tools, 3D content, and 3D printing materials have made design more cost-effective and expedited the product-to-market process. But how exactly do 3D visualization technologies work? Taking a closer look at the science behind the innovation reveals a striking convergence in which state-of-the-art research processes meet a growing understanding of visual communication.

Posted in: Imaging, Articles

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Precision Electronics and Laser Optics Expand Thermal Applications

Thermal imagers allow a user to see an object’s heat signature, and heat provides an entirely different set of performance data than the visible spectrum available to the naked eye. A fully radiometric camera will calculate a temperature value for every pixel seen on screen. The technician uses the thermal colors on screen to look for differences in temperature, between previous states or like components, without actually coming into direct contact with the device under test.

Posted in: Imaging, Articles

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Ophthalmology Imaging: The Importance of Color Reproduction

Lumenera recently partnered with an ophthalmology diagnostic device manufacturer that required a camera for integration into its product. The goal was to obtain sharp retinal fundus images with accurate color reproduction for documentation, sharing, and storage of their results. A date stamp was also needed for later review and diagnosis.

Posted in: Imaging, Application Briefs

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Multi-Touch Displays

American Industrial Systems (Irvine, CA) has announced industrial, widescreen, multi-touch HMI monitors and displays. A Projected Capacitive Sensor provides a gesture-based HMI interface that allows interactions such as pan, zoom, and rotate.

Posted in: Imaging, Products

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Lenses

Edmund Optics (Barrington, NJ) has doubled its offering of stock Zinc Selenide Plano-Convex (PCX) Lenses. The Zinc Selenide Plano-Convex Lenses are available individually, in diameters of 12.7, 25.4, and 50.8 mm, with a variety of focal lengths in both uncoated and 8-12 μm AR coated models. The anti-reflection coating has less than 0.5% reflection from 7.5 - 13.5 μm. A lens kit containing all nine uncoated 25.4-mm-diameter Zinc Selenide PCX Lenses is also offered. The Zinc Selenide Plano-Convex (PCX) Lenses have a usable transmission range of 600 nm to 16 μm with low dispersion.

Posted in: Imaging, Products

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High-Speed Camera

The S-MIZE EM high-speed camera from AOS Technologies AG (Baden, Switzerland) has built-in PowerPC architecture, which duplicates the control and status lines of a film camera. A range of available connectors also enable integration.

Posted in: Imaging, Products

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Frame Grabbers

BitFlow (Woburn, MA) provides an alternative to four-link CoaXPress (CXP) frame grabbers with its Karbon™ CXP2, a two-link frame grabber. BitFlow Karbon-CXP2 frame grabbers offer video acquisition speeds up to 6 Gigabits per second, and will send control commands and triggers at 20 Megabits per second — all over a 75 ohm coaxial cable in lengths up to 135 meters. Additionally, a maximum 13W of power can be transmitted to the camera along the cable. Karbon-CXP2 frame grabbers will support either one two-link camera or up to two single-link cameras.

Posted in: Imaging, Products

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Vision System

Teledyne DALSA (Waterloo, Ontario, Canada) has released the GEVA 3000 vision system. The fanless GEVA 3000 is equipped with a Gen3 Core i7 processor, choice of camera interface, and application software.

Posted in: Imaging, Products

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