Author(s): Kwonkyu Yu; Namjoo Lee; Yerim Kim
Linked Author(s):
Keywords: Velocity measurement; Surface image velocimeter; Far infra-red camera; Spatio-temporal image; Image processing
Abstract: In flow velocity measurement using a surface image velocimeter (SIV) in natural rivers, taking images with proper image quality is the most fundamental and important step. Since flood peaks generally occur at night time, it is very difficult to capture proper images during that time. The present study aims to test a far infra-red camera as an alternative to resolve various problems in flood discharge measurement by using SIV. Far infra-red cameras are able to capture images at night without the help of any extra illumination. Furthermore, they are not affected by fog or smoke and they can be adapted for fixed-type surface image velocimeters. For comparison, a commercial camcorder and a near infra-red camera were used. The test images were taken at day time and night time, and the image acquisition work was performed at an artificial flow channel. The analyzed results showed that the far infra-red camera would be a good instrument for surface image velocimeters, since they were able to capture images regardless of lighting conditions.
Year: 2017