SAYISAL İMGELER İÇİN PRNU VE CNN TABANLI BÖLGESEL MÜDAHALE TESPİTİ

Year 2019, Volume: 24 Issue: 2, 311 - 324, 30.08.2019

Ahmet Gökhan Poyraz

https://doi.org/10.17482/uumfd.516224

Abstract

Sayısal resimler üzerinde yapılan çeşitli
oynamaları tespit edebilmek, gelişen yazılımların karmaşıklığından ötürü
oldukça zorlaşmaktadır. Bu karmaşıklığa çözüm olarak klasik müdahale tespiti
yöntemlerine ek olarak son yıllarda evrişimsel sinir ağı tabanlı yöntemler
geliştirilmiştir. Böylelikle çok karmaşık müdahaleleri bile tespit edebilen
ağlar eğitilebilmiştir. Bu makalede, küçük boyutlarda pencere kullanarak
bölgesel müdahale tespiti yapabilen klasik yöntemlerden olan, kameranın
kendisine ait olan sensörlerinden elde edilen parmakizini kullanan sensör
tabanlı PRNU(Photo Response Non Uniformity) yöntemi ile yeni bir yaklaşım olan evrişimsel
sinir ağı(CNN) tabanlı kamera model sınıflandırıcısı yöntemi
karşılaştırılmıştır. Böylelikle hangi yöntemin daha başarılı olduğu detaylıca
ortaya koyulmuştur. Toplamda 26 adet kamera modeli ve bu kamera modellerinden
seçilen 96 x 96’lık piksel blokları ile eğitilen CNN modeli, hem 96 hem de
128’lik pencere boyutu kullanılarak çalışan PRNU yöntemi ile kıyaslanmıştır. Bu
kıyaslama sonucunda bölgesel müdahale tespiti probleminde CNN tabanlı kamera
model sınıflandırıcısının PRNU yöntemine göre daha başarılı olduğu
gösterilmiştir. 

Keywords

Lokal müdahale tespiti, evrişimsel sinir ağı, PRNU, oynanmış bölge tespiti, kamera model sınıflandırıcısı, derin öğrenme

PRNU and CNN Based Local Tamper Detection For Digital Images

Abstract

Detecting various forgeries on digital images is
becoming more difficult due to the complexity of developing software. As a
solution to this complexity, in addition to conventional detection methods,
convolutional neural network (CNN) based methods have been developed in recent
years. Thus, networks capable of detecting even very complex interventions
could be trained. In this paper, a new approach to the convolutional neural
network (CNN) based camera model classifier method is compared with the
sensor-based PRNU (Photo Response Non Uniformity) method, which is one of the
classical methods that can detect local detection using small-scale windows.
Thus, which method is more successful is revealed in detail. A total of 26
camera models and the CNN model, which was trained with 96 x 96 pixel blocks
selected from these camera models, was compared with the PRNU method using both
the 96 and 128 window size. As a result of this comparison, CNN based camera
model classifier has been shown to be more successful than PRNU method in the
local tamper detection problem.

Keywords

Local tamper detection, convolutional neural network, PRNU, image forgery, camera model classifier, deep learning

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