Patent ID: 9020293
Filing Date: 2015-04-28
Classification: G06T

Abstract:
1. A method for removing speckle noise, residual noise and noise at lateral surface of height discontinuities in an image reconstruction, wherein said method comprises: generating interferograms of an object image; generating a wrapped phase map of said object image from said interferograms by application of a phase-shift algorithm, wherein said wrapped phase map contains said speckle noise, said residual noise and said noise at lateral surface of height discontinuities; detecting said speckle noise, said residual noise and said noise at lateral surface of height discontinuities and filtering said speckle noise and said residual noise from said wrapped phase map by a first filter, thereby obtaining a noise-reduced wrapped phase map; unwrapping said noise-reduced wrapped phase map in row direction by a path-dependent phase unwrapping algorithm; filtering phase map obtained from application in said row direction of said path-dependent phase unwrapping algorithm by a second filter; unwrapping phase map obtained from said second filter in column direction by said path-dependent phase unwrapping algorithm; and filtering phase map obtained from application in said column direction of said path-dependent phase unwrapping algorithm by a third filter, thereby obtaining an unwrapped phase map, wherein said unwrapped phase map is free from said speckle noise, said residual noise and said noise at lateral surface of height discontinuities.