Digital Image Processing

Dipesh G. Kamdar ¹, C. H. Vithalani ²

Affiliations
1 Department of Electronics and Communication Engineering, Shri Jagdishprasad Jhabarmal Tibrewala University, Jhunjhunu, Rajasthan, IN
2 Department of Electronics and Communication Engineering, Government Engineering College, Rajkot, Gujarat, IN

Abstract

Steganography is art of data hiding within data, the data to be hidden is known as information and data in which the information is hiding is known as cover. The word steganography is of Greek origin which means "concealed writing" from the Greek words steganos meaning "covered or protected", and graphei meaning "writing". In this era, information and cover can be any form of text, speech, image or video. The information can be embedded into the cover using many different ways. The choice of embedding algorithm in most of the cases is driven by results of the steganography output robustness analysis, channel of transmission, security aspect of hiding, etc. In this paper, different LSB (Least Significant Bit) replacement based embedding techniques are implemented over the video file as cover file. The comparative analysis of the different LSB replacement technique for steganography is made using the different algorithms implemented in MATLAB.

Keywords

Steganography, LSB Steganography, Public Key.

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Dipesh G. Kamdar ¹, C. H. Vithalani ²

Affiliations
1 Department of Electronics and Communication Engineering, Shri Jagdishprasad Jhabarmal Tibrewala University, Jhunjhunu, Rajasthan, IN
2 Department of Electronics and Communication Engineering, Government Engineering College, Rajkot, Gujarat, IN

Abstract

The Time Lapse Technique is cinemography technique where by each film frame is captured at much slower rate than it will replay back. When replayed at normal rate, time appears to be moving faster and thus time lapsing. Time lapse technique is very powerful technique to document slowly changing/developing/moving phenomenon. The natural movements like sunrise, blooming of flowers periodic time lapse is used, while for uncertain activities like human activity, birds flying, animal movement etc aperiodic time lapse video is used. One of the classifications of aperiodic time lapse video is differential time lapse video. In differential time lapse video, each frame are compared with previously stored frame, if movement found in the frame than frame is stored and considered as last stored frame, else frame is discarded. The quality of differential time lapse video depends on the frame selection criterion. Edge based motion detection criterion is used here to overcome the limitation of pixel to pixel bit matching based motion detection. In this paper, MATLAB based algorithm is used to generate differential time lapse video with edge based motion detection is used as frame selection criterion.

Keywords

Differential Time Lapse Video, Edge Based Motion Detection Algorithm.

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