Digital Image Processing

S. Manimurugan ¹, Neenu Sebastian ²

Affiliations
1 Anna University, Coimbatore, IN
2 Karunya University, IN

Abstract

Digital Technology has matured to become predominant technology for creating, processing, transmitting and storing a information, a form of knowledge and intellectual assets. Digital image forgery is a growing problem in criminal cases and in public discourse. Photographic fakes can be used to promote a magazine story, defame a political opponent, or other objectives. Digital image forensic tools are helping to investigate and solve crimes. Realizing that it might be impossible to develop a method that is universal for all kinds of images and JPEG is the most frequently used image format, here an approach that can detect doctored JPEG images is proposed. In the proposed method the difference in the JPEG compression qualities within the forged image is used for detecting the forgery performed. Finally, automatic tampering detection and location of tampered region are fulfilled by image segmentation.

Keywords

Digital Forgeries, Segmentation, JPEG Ghost, Global Thersholding.

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S. Manimurugan ¹, K. Porkumaran , Neenu Sebastian ², Neethu Rajan ²

Affiliations
1 Anna University, Coimbatore, IN
2 Karunya University, IN

Abstract

Today images are widely used for the authentication purposes. For example in digital watermarking, visual cryptography etc, we use images for the authentication. Here images are transmitted from sender to receiver through a communication network, where they are processed for ensuring the authentication. While transmitting the images we must ensure that it is compressed effectively without losing the quality of image. Another threat while sending the image through network is that, it can be accessed and modified by a third party easily. This will affect the integrity of the image and it cannot be used for the authentication purposes. For ensuring a better usage of image for authentication purposes our approach uses the JPEG LS compression technique, which provides a better compression rate and good visual quality. For checking the integrity of image here the JPEG Ghost technique is used.

Keywords

Compression, Digital Forgeries, JPEG Compression, JPEG Ghost, JPEG LS.

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