Abstract: The main problems of current methods for testing interfered area of anti-infrared smoke screen and its obscuring ratio were analyzed. To improve the testing quality, a new method based on multi-resolution and wavelet analysis was explored. The infrared image of smoke screen is divided into some images with different resolutions, which compose a level-featured data structure. The fringe curve of smoke cloud image is drawn out and the closed area of the curve can be calculated via the image iringe-testing algorithm of wavelet transform. Thu^ both the effectual interfered area and distribution of the obscuring ratio can be obtained. This new method can be used to assess integrally the performance of smoke screen. It also provides a reference for the development of smoke bomb and smoke device.

Key words: information processing technique , wavelet analysis , smoke screen , multi-resolution analysis , in?frared , effectual obscurant area , obscuring ratio