A Color Restoration Method for Irreversible Thermal Paint Based on Atmospheric Scattering Model

Zhan WANG  Ping-an DU  Jian LIU  

Publication
IEICE TRANSACTIONS on Information and Systems   Vol.E101-D   No.3   pp.826-829
Publication Date: 2018/03/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.2017EDL8167
Type of Manuscript: LETTER
Category: Image Processing and Video Processing
Keyword: 
image processing application,  aero-engine,  temperature measurement,  nondestructive testing,  thermal analysis,  

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Summary: 
Irreversible thermal paints or temperature sensitive paints are a kind of special temperature sensor which can indicate the temperature grad by judging the color change and is widely used for off-line temperature measurement during aero engine test. Unfortunately, the hot gases flow within the engine during measuring always make the paint color degraded, which means a serious saturation reduction and contrast loss of the paint colors. This phenomenon makes it more difficult to interpret the thermal paint test results. Present contrast enhancement algorithms can significantly increase the image contrast but can't protect the hue feature of the paint images effectively, which always cause color shift. In this paper, we propose a color restoration method for thermal paint image. This method utilizes the atmospheric scattering model to restore the lost contrast and saturation information, so that the hue can be protected and the temperature can be precisely interpreted based on the image.