IR emitter non-uniformity correction (NUC): making sense of the data

Oleson, Jim; Greer, Derek

doi:10.1117/12.883450

Cited by 4 publications

(6 citation statements)

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“…The error quantifies our ability to reproduce the original image and for these simulation conditions is around 0.5% which is already considerably better than the uniformity of resistive element based arrays [3]. As part of the calculation to produce image E to be displayed by the projector DMD, we apply a threshold which for each pixel in the structured illumination image D below a threshold value sets the corresponding pixels in E to the corresponding original image A pixel value.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…This technology is based on a two-dimensional array of resistive elements which radiate in response to current with a blackbody emission spectra. [1][2][3] Resistive array technology is mature and has reasonable response time, temperature resolution, and spatial resolution, however, it has consistently been plagued with poor uniformity and pixel operability and high device cost. A competing technology is diode-based arrays with which very bright apparent temperature levels are possible.…”

Section: Introductionmentioning

confidence: 99%

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High-dynamic range DMD-based IR scene projector

Dupuis

Mansur

Vaillancourt

et al. 2013

Emerging Digital Micromirror Device Based Systems and Applications V

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OPTRA is developing a next-generation digital micromirror device (DMD) based two-band infrared scene projector (IRSP) with infinite bit-depth independent of frame rate and an order of magnitude improvement in contrast over the state of the art. Traditionally DMD-based IRSPs have offered larger format and superior uniformity and pixel operability relative to resistive and diode arrays, however, they have been limited in contrast and also by the inherent bitdepth / frame rate tradeoff imposed by pulse width modulation (PWM). OPTRA's high dynamic range IRSP (HIDRA SP) has broken this dependency with a dynamic structured illumination solution. The HIDRA SP uses a source conditioning DMD to impose the structured illumination on two projector DMDs -one for each spectral band. The source conditioning DMD is operated in binary mode, and the relay optics which form the structured illumination act as a low pass spatial filter. The structured illumination is therefore spatially grayscaled and more importantly is analog with no PWM. In addition, the structured illumination concentrates energy where bright object will be projected and extinguishes energy in dark regions; the result is a significant improvement in contrast. The projector DMDs are operated with 8-bit PWM, however the total projected image is analog with no bit-depth / frame rate dependency. In this paper we describe our progress towards the development, build, and test of a prototype HIDRA SP.

show abstract

Section: Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-dynamic range DMD-based IR scene projector

Dupuis

Mansur

Vaillancourt

et al. 2013

Emerging Digital Micromirror Device Based Systems and Applications V

View full text Add to dashboard Cite

show abstract

“…3 As part of the calculation to produce image E to be displayed by the projector DMD, we apply a threshold that for each pixel in the structured illumination image D below a threshold value sets the corresponding pixels in E to the corresponding original image A pixel value. 3 As part of the calculation to produce image E to be displayed by the projector DMD, we apply a threshold that for each pixel in the structured illumination image D below a threshold value sets the corresponding pixels in E to the corresponding original image A pixel value.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…[1][2][3] Resistive array technology is mature and has reasonable response time, temperature resolution, and spatial resolution; however, it has consistently been plagued with poor uniformity, pixel operability, and high device cost. The scene projectors can be used to simulate a wide range of different threat scenarios with realistic scenes that accurately represent the spectral, spatial, temporal, and radiometric characteristics of the threat or threats.…”

Section: Introductionmentioning

confidence: 99%

High dynamic range digital micromirror device-based infrared scene projector

Mansur

Vaillancourt

Benedict-Gill

et al. 2013

J. Micro/Nanolith. MEMS MOEMS

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OPTRA is developing a next generation digital micromirror device (DMD) based two-band infrared scene projector (IRSP) with infinite bit depth independent of frame rate and an order of magnitude improvement in contrast over the state of the art. Traditionally, DMD-based IRSPs have offered larger format, superior uniformity, and pixel operability relative to resistive and diode arrays. However, they have been limited in contrast and also by the inherent bit depth/frame rate tradeoff imposed by pulse width modulation (PWM). OPTRA's high dynamic range IRSP (HIDRA SP) has broken this dependency with a dynamic structured illumination solution. The HIDRA SP uses a source-conditioning DMD to impose the structured illumination on two projector DMDs-one for each spectral band. The source-conditioning DMD is operated in binary mode, and the relay optics that form the structured illumination act as a low-pass spatial filter. The structured illumination is, therefore, spatially grayscaled and more importantly is analog with no PWM. In addition, the structured illumination concentrates energy where bright objects will be projected and extinguishes energy in dark regions; the result is a significant improvement in contrast. The projector DMDs are operated with 8-bit PWM; however, the total projected image is analog with no bit depth/frame rate dependency. We describe our progress toward the development, building, and testing of a prototype HIDRA SP. Downloaded From: http://nanolithography.spiedigitallibrary.org/ on 05/15/2015 Terms of Use: http://spiedl.org/terms

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“…Many approaches have been developed to correct emitter array non-uniformity [1][2][3][4][5][6][7]. These generally employ three basic steps: data collection, curve fitting, and generation of NUC coefficients.…”

Section: Introductionmentioning

confidence: 99%

Advances in iterative non-uniformity correction techniques for infrared scene projection

et al. 2015

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Santa Barbara Infrared (SBIR) is continually developing improved methods for non-uniformity correction (NUC) of its Infrared Scene Projectors (IRSPs) as part of its comprehensive efforts to achieve the best possible projector performance. The most recent step forward, Advanced Iterative NUC (AI-NUC), improves upon previous NUC approaches in several ways. The key to NUC performance is achieving the most accurate possible input drive-toradiance output mapping for each emitter pixel. This requires many highly-accurate radiance measurements of emitter output, as well as sophisticated manipulation of the resulting data set. AI-NUC expands the available radiance data set to include all measurements made of emitter output at any point. In addition, it allows the user to efficiently manage that data for use in the construction of a new NUC table that is generated from an improved fit of the emitter response curve. Not only does this improve the overall NUC by offering more statistics for interpolation than previous approaches, it also simplifies the removal of erroneous data from the set so that it does not propagate into the correction tables. AI-NUC is implemented by SBIR's IRWindows4 automated test software as part its advanced turnkey IRSP product (the Calibration Radiometry System or CRS), which incorporates all necessary measurement, calibration and NUC table generation capabilities. By employing AI-NUC on the CRS, SBIR has demonstrated the best uniformity results on resistive emitter arrays to date.

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IR emitter non-uniformity correction (NUC): making sense of the data

Cited by 4 publications

References 0 publications

High-dynamic range DMD-based IR scene projector

High-dynamic range DMD-based IR scene projector

High dynamic range digital micromirror device-based infrared scene projector

Advances in iterative non-uniformity correction techniques for infrared scene projection

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