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首页> 外文会议>Conference on emerging digital micromirror device based systems and applications; 20090128; San Jose, CA(US) >Programmable matched filter and Hadamard transform hyperspectral imagers based on micro-mirror arrays
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Programmable matched filter and Hadamard transform hyperspectral imagers based on micro-mirror arrays

机译：基于微镜阵列的可编程匹配滤波器和Hadamard变换高光谱成像仪

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Hyperspectral imaging (HSI), in which each pixel contains a high-resolution spectrum, is a powerful technique that can remotely detect, identify, and quantify a multitude of materials and chemicals. The advent of addressable micro-mirror arrays (MMAs) makes possible a new class of programmable hyperspectral imagers that can perform key spectral processing functions directly in the optical hardware, thus alleviating some of HSI's high computational overhead, as well as offering improved signal-to-noise in certain important regimes (e.g. when using uncooled infrared detectors). We have built and demonstrated a prototype UV-Visible micro-mirror hyperspectral imager that is capable not only of matched-filter imaging, but also of full hyperspectral imagery via the Hadamard transform technique. With this instrument, one can upload a chemical-specific spectral matched filter directly to the MMA, producing an image showing the location of that chemical without further processing. Target chemicals are changeable nearly instantaneously simply by uploading new matched-filter patterns to the MMA. Alternatively, the MMA can implement Hadamard mask functions, yielding a full-spectrum hyperspectral image upon inverting the transform. In either case, the instrument can produce the 2D spatial image either by an internal scan, using the MMA itself, or with a traditional external push-broom scan. The various modes of operation are selectable simply by varying the software driving the MMA. Here the design and performance of the prototype is discussed, along with experimental results confirming the signal-to-noise improvement produced by the Hadamard technique in the noisy-detector regime.
机译：高光谱成像（HSI）（每个像素包含一个高分辨率光谱）是一项强大的技术，可以远程检测，识别和量化多种材料和化学物质。可寻址微镜阵列（MMA）的出现使新型可编程高光谱成像器成为可能，这些成像器可以直接在光学硬件中执行关键的光谱处理功能，从而减轻了HSI的一些高计算开销，并提供了改进的信号-在某些重要情况下会产生噪音（例如，使用未冷却的红外探测器时）。我们已经建立并演示了原型的紫外可见微镜高光谱成像仪，该成像仪不仅能够进行匹配滤光片成像，而且还能够通过Hadamard变换技术实现完整的高光谱成像。使用该仪器，可以将一种特定于化学物质的光谱匹配滤光片直接上传到MMA，无需进一步处理即可生成显示该化学物质位置的图像。只需将新的匹配过滤器图案上传到MMA，目标化学物质几乎可以立即更改。或者，MMA可以实现Hadamard遮罩功能，在反转变换后会产生全光谱高光谱图像。无论哪种情况，仪器都可以通过内部扫描（使用MMA本身）或传统的外部扫帚扫描来生成2D空间图像。只需更改驱动MMA的软件即可选择各种操作模式。这里讨论了原型的设计和性能，以及实验结果，这些结果证实了Hadamard技术在噪声检测器领域产生的信噪比改善。

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