Vpliv stiskanja jpeg2000 z izgubami na klasifikacijo posnetkov worldview-2

Effects of lossy jpeg2000 compression method on worldview-2 image classification

Author(s):

Aleš Marsetič, Žiga Kokalj, Krištof Oštir

Abstract:

Lossy compression is becoming increasingly used in remote sensing, although its effect on the processing results has yet not been fully investigated. This paper presents the effects of JPEG2000 lossy compression on the classification of very high-resolution WorldView-2 imagery. For the first time, the k-nearest neighbor and support vector machine methods of the object based classification were used. The results explore the impact of compression on the images, segmentation and resulting classification. The study proves that in general lossy compression does not adversely affect the classification of images; moreover, in some cases classification of compressed images yields better results than classification of the original image. Classification accuracy of the support vector machine method indicates that compression ratios of up to 30:1 can be used without any loss of classification accuracy. The best result of the k-nearest neighbor method was obtained with the highest compression ratio (100:1). The support vector machine is recommended for further research. In addition to the classification method, image segmentation also plays an important role in the accuracy of the results.

Keywords:

image lossy compression, object classification, JPEG2000, WorldView-2, support vector machine, k-nearest neighbour

DOI: 10.15292/geodetski-vestnik.2012.02.275-289

Citation:

Aleš Marsetič, Žiga Kokalj, Krištof Oštir (2012). Vpliv stiskanja jpeg2000 z izgubami na klasifikacijo posnetkov worldview-2. | Effects of lossy jpeg2000 compression method on worldview-2 image classification. Geodetski vestnik, 56 (2), 275-289. DOI: 10.15292/geodetski-vestnik.2012.02.275-289