Linear and non-linear enhancement for sun glint reduction in advanced very high resolution radiometer (AVHRR) image

• Main Authors: Roslan, Nurul Hani, Md. Reba, Mohd. Nadzri, Askari, M., Abdullah Halim, Mohd. Khairul
• Format: Article
• Language: English
• Published: Institute of Physics Publishing 2014
• Subjects: HD Industries. Land use. Labor
• Online Access: http://eprints.utm.my/id/eprint/53318/1/Mohd.KhairulAbdullahHalim2014_Linearandnon-linearenhancement.pdf; http://eprints.utm.my/id/eprint/53318/; http://dx.doi.org/10.1088/1755-1315/18/1/012041

Cloud detection over water surfaces is difficult due to the sun glint effect. The mixed pixels between both features may introduce inaccurate cloud classification. This problem generally occurs because of less contrast between the glint and the cloud. Both features have almost the same reflectance in the visible wavelength. The piecewise contrast stretch technique shows preservation capability on the reflectance of the cloud. The result of a band ratio was smoothed by applying the Sobel edge detection to provide better cloud feature detection. The study achieved an accuracy of about 77.5% in cloud pixels detection