COMPRESSION METHODS FOR SATELLITE IMAGES USING WAVELET TRANSFORM AND PERFORMANCE EVALUATION

Yıl 2024, Cilt: 8 Sayı: 2, 72 - 81

İbrahim Öz

https://doi.org/10.46460/ijiea.1440970

Öz

Research on image compression spans various fields, focusing on achieving efficient compression while preserving a specific image quality. Satellite images captured by observation satellites possess unique characteristics distinct from other images. Analyzing these specific qualities is decisive, leading to the proposal of tailored compression methods and transforms suitable for satellite image characteristics. This study comprehensively assesses the performance of six well-known compression methods in the literature, utilizing wavelet transform and metrics such as bits per pixel (BPP), compression ratio (CR), Peak Signal-to-Noise Ratio (PSNR), calculation time (CT), and Mean Squared Error (MSE). The compressed satellite images, generated through six methods and the Coif3 wavelet, are systematically compared and evaluated using performance metrics. The average values obtained for all six methods are 96.37%, 47.10 dB, and 7.92 seconds for CR, PSNR, and CT receptively, while WDR exhibits CR at 96.36%, PSNR at 48.84 dB, and CT at 6.58 seconds. The findings indicate that the Wavelet Difference Reduction (WDR) compression method utilizing the Coif3 wavelet outperforms others when considering all parameters together. We suggest that operators and manufacturers choose wavelet transform and WDR compression methods for effective compression of observation satellite images to achieve optimal results.

Anahtar Kelimeler

image compression, satellite image, suitable compression methods, wavelet transform

DALGACIK DÖNÜŞÜMÜ İLE UYDU GÖRÜNTÜSÜ SIKIŞTIRMA METOTLARI VE PERFORMANS DEĞERLENDİRMESİ

Öz

Görüntü sıkıştırma üzerine birçok alanda araştırma yapılmakta ve hedef belirli bir görüntü kalitesini korurken iyi bir sıkıştırma oranı elde etmektir. Gözlem uyduları tarafından çekilen uydu görüntüleri, diğer görüntülerden farklı özelliklere sahiptir. Bu özelliklerin analizi ile bu alana özgü dönüşüm ve sıkıştırma teknikleri geliştirilebilir. Bu çalışmada uydu görüntüsü sıkıştırılmış, dalgacık dönüşümü ve literatürde çok bilinen altı sıkıştırma yönteminin performansı; piksel başına bit (PBB), sıkıştırma oranı (SO), tepe sinyal gürültü oranı (TSGO), hesaplama süresi (HS) ve ortalama kare hata (OKH) gibi ölçütler kullanarak kapsamlı bir şekilde değerlendirilmiştir. Coif3 dalgacık dönüşümü ve bu altı sıkıştırma metodu kullanılarak elde edilen sıkıştırılmış uydu görüntüsü sistematik olarak karşılaştırılırmış ve değerlendirilmiştir. Altı yöntemin ortalama değerleri SO için %96.37, TSGO için %47.10 db ve HS için7.92 saniye iken, WDR metodunda SO, %96.36, TSGO %48.34 db ve HS 6.58 saniye olarak elde edilmiştir. Bulgular, Coif3 dalgacık dönüşümü kullanan WDR sıkıştırma yönteminin, tüm performans parametreleri dikkate alındığında diğer yöntemleri geride bıraktığını göstermektedir. Bu çalışma sonuçlarına göre uydu operatörleri ve işletmecilerine gözlem uydusu görüntüsü sıkıştırma işleminde başarılı sonuçlarından dolayıdalgacık dönüşümü ve WDR metodunu öneriyoruz.

Anahtar Kelimeler

Dalgacık dönüşümü, görüntü sıkıştırma, uydu görüntüsü, uygun sıkıştırma metotları

Kaynakça

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