Correction method of an image distortion using a coded dots pattern on a LCD - Accuracy evaluation using a PIV standard image -

Abstract

In implementing the particle image velocimetry (PIV), the measurement accuracy is often badly influenced by the distortion caused by the refraction depending on the shape of the water tank. In this paper, we propose a correction method of an image distortion using a liquid crystal display (LCD). A waterproof LCD is placed in the water and it displays a coded dots pattern to construct a coordinate transformation table which is used to eliminate distortion. In this paper, the proposed method demonstrates the correction of the distortion due to the refraction effects between the tank and water. The performance of the proposed method is evaluated utilizing the PIV standard images.