首页>
外国专利>
Temporal noise reduction, compression and analysis of thermographic image data sequences
Temporal noise reduction, compression and analysis of thermographic image data sequences
展开▼
机译:温度图像数据序列的时间噪声减少,压缩和分析
展开▼
页面导航
摘要
著录项
相似文献
摘要
A method and system for non-destructive, reference-free thermographic detection of sub-surface defects uses an infrared camera to capture images of a sample that has been heated and allow to cool to equilibrium temperature. The temperature-time data obtained for each pixel in each image is converted into the logarithmic domain and a least squares fit is conducted on the data to generate a polynomial expression corresponding to the temperature-time data for a given pixel. This polynomial expression can be transformed into the original time domain to obtain temperature-time data with improved signal-to-noise characteristics. Defects can be detected by observing the zero-crossing characteristic of the second derivative of the polynomial.
展开▼