High-speed waterjet has been widely used in industries and been investigated as a model of free shearing turbulence.
This paper presents an investigation involving the flow visualization of high speed water jet, the noise reduction of the
raw thermogram using a high-pass morphological filter and a median filter; the image enhancement using white
top-hat filter; and the image segmentation using the multiple thresholding method. The image processing results by the
designed morphological filters, - top-hat, were proved being ideal for further quantitative and in-depth analysis and
can be used as a new morphological filter bank that may be of general implications for the analogous work