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Browsing by Subject "correlation ratio"

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  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Wpływ kompresji JPEG na wykrywanie cech na obrazach cyfrowych
    (Wydawnictwa AGH, 2006) Jachimski, Józef; Mikrut, Zbigniew
    In the paper some methods of image analysis of the influences of the JPEG compression on feature extraction on digital images are presented. The problem of compression of digital images has an important meaning in case of work on images consisting a cartometric material. It happens in digital photogrammetry, where geometric accuracy is the ground of the measurements. The measures of the quality losses proposed in this paper allow to estimate an influence of various compressions on cartometry. This are: mean error of point position on digital image after compression, in comparison with uncompressed image, and the second measure - correlation coefficient of images. The experiments were performed on satellite images QuicBird, which record images in four spectral bands with resolution 2,4 m.