Abstract
Image degradation is regarded as the major limiting factor for accurate evaluation of surface tem peratures with infrared thermography, especially if a high spatial resolution in combination with a large depth-of-field is required. The paper discusses the application of an infrared image restoration technique to enhance the accuracy of surface temperature measurements of small three-dimensional objects. The restoration technique applied is based on a Wiener filter which uses the two-dimensional Optical Transfer Function (OTF), characterising the infrared camera. The OTF was determined from the camera response to a perfect thermal step-edge. Infrared thermographs, acquired from small cubical elements subject to well established boundary condiiions, are processed with both the restoration filter and in situ calibration to arrive at surface temperatures. Surface temperatures, obtained independently with liquid crystal thermography, are in excellent agreement with the restored results, showing both the necessity for image restoration and improvement of accuracy.
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