Abstract

Su altı görüntüleme sistemleri, su altının karmaşık yapısından ve ışığın dalga boyuna bağlı emilim ve yansıma gibi sorunlardan kaynaklı olarak, karşıtlığı ve görünürlüğü düşük, yapay renkli görüntüler elde etmektedirler. Elde edilen bu görüntüler; başta insan görsel algısı olmak üzere ileri görüntü işleme uygulamalarını olumsuz etkilemektedirler. Bu sorunları gidermek amacıyla sanal pozlamaya dayalı bir su altı görüntü iyileştirme yöntemi önerilmiştir. Bu yöntem ilk olarak, gama düzeltmesi ile sanal pozlanmış görüntüler elde etmiştir. Elde edilen sanal pozlu görüntüler, kılavuzlu filtre yardımıyla düşük ve yüksek frekans bileşenlerine ayrılmıştır. Bu düşük frekanslı bileşenlere histogram germe uygulanırken, yüksek frekanslı bileşenlerin en yüksek değerleri seçilerek yeni bileşenler üretilmiştir. Elde edilen yeni bileşenler birleştirilerek, iyileştirilmiş görüntü elde edilmiştir. Yöntemin performansını ölçmek amacıyla, literatürde kullanılan yöntemlerle karşılaştırmalar yapılmıştır. Önerilen yöntemin PSNR olarak en iyi olduğu gözlemlenirken, SSIM değeri tatmin edici düzeydedir. Ayrıca görsel sonuçlar, önerilen yöntemin renkleri korurken kenar bilgilerini geliştirdiğini ortaya koymaktadır.

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