Küçük boyutlu nesnelerin 3 boyutlu modellemesi için akıllı telefon görüntüleri kullanılarak hareketten nesne oluşturma fotogrametrisine dayalı bir araştırma

Öz

Son yıllarda, akıllı telefon ya da tabletler gibi nispeten düşük maliyetli cihazlarla görüntü elde etme alanında yaşanan gelişmeler sonucunda, Hareketten Nesne Oluşturma (HNO) fotogrametrisine dayalı 3 boyutlu (3B) modelleme popüler olmuş ve özellikle jeoloji/jeomorfoloji, kültürel miras, orman vb. alanlarda yaygın bir uygulama haline gelmiştir. Bu çalışmanın amacı, akıllı telefon kamerası ile elde edilen görüntülerden değişen görüntü sayılarına dayalı 3B model oluşturma potansiyelinin araştırılmasıdır. Bu amaçla, küçük boyutlu nesnelere ait akıllı telefon kameraları kullanılarak elde edilen farklı sayıdaki görüntüler kullanılarak HNO fotogrametrisine dayalı 3B veri setleri oluşturulmuş ve bu veri setleri için (i) nokta bulutları arasında, (ii) üçgen model ile nokta bulutu arasında, olmak üzere sapma analizleri gerçekleştirilmiştir. Safranbolu minyatürü (SMH), Roma biblosu (HBR) ve ahşap nesne (WO) olmak üzere farklı detay düzeylerinde seçilen bu üç farklı boyuttaki nesne için elde edilen görüntüler her veri setinde %25 oranında azaltılmıştır. Bu şekilde, toplam 12 farklı veri seti oluşturulmuş ve bu veri setleri için nokta bulutları arasında 9, üçgen model ile nokta bulutu arasında ise 21 farklı karşılaştırma gerçekleştirilmiştir. Buna göre, elde edilen sonuçlar dikkate alındığında 3B modellerin doğruluğunun, modellemesi yapılan nesnelerin şekilsel ve boyutsal farklılığına göre değiştiği görülmekle birlikte, sapma analizine dayalı elde edilen sonuçlar nesnenin detay düzeyi ile sonuç model doğruluğu arasında yüksek ilişki olduğunu göstermiştir.

Anahtar Kelimeler

• Hareketten nesne oluşturma (HNO)
• Akıllı telefon görüntüsü
• 3B Model oluşturma
• Değişim analizi

Research on 3D reconstruction of small size objects using structure from motion photogrammetry via smartphone images

Öz

According to the recent developments on image acquisition via relatively low-cost devices such as smartphones or tablets, researches on Structure-from-Motion (SfM) photogrammetry-based 3 dimensional (3D) model reconstruction become more popular and wide frequent practice especially for study areas in geology/geomorphology, historical heritage, forestry, etc. Thus, this paper demonstrates accuracy assessment of SfM photogrammetry-based 3D model reconstruction of small size objects by altering number of the source imagery captured by smartphone and represents change detection of the generated datasets as (i) cloud-to-cloud and (ii) mesh-to-cloud comparisons. The number of images was decreased as 25% of each datasets belonging three different detail types of small size objects as the Safranbolu miniature house (SMH), a trinket made of a combination of historical buildings in Rome (HBR), and a wooden object (WO). A total of 12 datasets were generated and 9 cloud-to-cloud, and 21 mesh-to-cloud comparisons were performed. Since the obtained results show that the quality of 3D models of objects varies according to their shapes and sizes, change detection analyses show that the detail level of the objects are highly correlated with the resultant model accuracy.

Anahtar Kelimeler

• Structure-from-Motion (SfM) photogrammetry
• Smartphone imagery
• 3D Model reconstruction
• Change detection

Teşekkür

Duygu Arıcan, YÖK 100/2000 Doktora Programı kapsamında Yükseköğretim Kurulu (YÖK) tarafından belirlenen 100 ulusal öncelikli alandan biri olan "CBS ve Bilişim Uygulamaları" alanında YÖK bursiyeridir. Duygu Arıcan is a Ph.D. scholarship holder from the Council of Higher Education (YÖK) in the field of "GIS and Informatics Applications", which is one of the 100 national priority areas determined by YÖK within the scope of the YÖK 100/2000 Doctorate Program.

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