Browsing by Subject "orientacja wzajemna"

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Access status: Open Access ,
Porównanie dokładności metod wyznaczania punktów charakterystycznych na parach zdjęć lotniczych
(Wydawnictwa AGH, 2007) Pawlik, Piotr; Mikrut, Sławomir
To solve the problem with two corresponding points on digital air images some different algorithms were developed. In this paper the authors tried to compare some methods. The methods such as: SIFT, Harris, Hesjan were tested and implemented. The experiments were based on real air images (air photography), which have been taken in two different scales. To estimation the accuracy, the parameters such as : mean parallax on the model, number of matching points and their position, were used. The results show the similarity between the methods, but depending on kind of photography (the texture of the image).
Access status: Open Access ,
Wykorzystanie sieci Kohonena do selekcji podobrazów na potrzeby dopasowania zdjęć lotniczych
(Wydawnictwa AGH, 2007) Czechowicz, Anna; Mikrut, Zbigniew
Automatic relative orientation is one of the key problems in photogrammetric processing. This paper concerns the application of the representation based on the gradient distribution and Kohonen neural networks for the selection of sub-images for aerial photographs matching purposes. The examinations were conducted over 904 sub-images of the aerial photographs of the Krakow's surroundings with different land cover, grouped into three categories: advantageous, nondescript and disadvantageous in respect of searching features for relative orientation. The 2D histogram was acquired for every sub-image and on this basis the representation in form of the vector of maximum values for gradient direction has been determined. This representation was utilized for the classification of areas with Kohonen network. The correctness of the obtained classification, compared to manually done, achieved the Ievel of 68,3%.