Inexact Implementation of Wavelet Transform and Its Performance Evaluation Through Bit Width Reduction

2016 ◽  
pp. 227-242 ◽  
Author(s):  
Moumita Acharya ◽  
Chandrajit Pal ◽  
Satyabrata Maity ◽  
Amlan Chakrabarti
Keyword(s):  
Performance Evaluation ◽  
Wavelet Transform ◽  
Width Reduction

scholarly journals Performance Evaluation of Block based Video Watermarking after Attacks

2019 ◽  
Vol 8 (2S11) ◽  
pp. 225-233
Keyword(s):  
Performance Evaluation ◽  
Wavelet Transform ◽  
Discrete Wavelet Transform ◽  
Digital Media ◽  
Video Watermarking ◽  
Discrete Wavelet ◽  
Transform Domain ◽  
Video Frames ◽  
Block Based

In today’s era use of digital media is most popular way of communication. Digital media covers images, videos and animations available online. The easy methods of accessing, copying and editing digital media have made them more popular. With several advantages these easy methods of copying and editing data have created some big issues like ownership identification. This increases the demand of protecting online digital media. Watermarking is solution of such problem. In this work, a block-based method has been proposed for video watermarking that uses a key at the time of embedding and extraction. Some frames are selected from the video according to a key. Watermark is embedded on the selected frames after dividing into parts called blocks. Each part of the watermark is embedded in one selected frame of the video. This method increases the security of the system as the complete watermark cannot be extracted without knowing the positions of watermarked frames and the position of the block in that frame. Watermarking is performed in the Discrete Wavelet Transform domain after scaling of watermark data. To show the authenticity of proposed scheme various attacks are applied on different watermarked video frames and extracted watermark results are shown under different tables.

Performance Evaluation of Wavelet-Based Optical Wireless System using On-Off Keying Modulation

2019 ◽  
Vol 40 (3) ◽  
pp. 261-264
Author(s):  
Himanshu Monga ◽  
Shilpa Rani ◽  
Pooja Mehta
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Performance Evaluation ◽  
Wavelet Transform ◽  
Discrete Wavelet ◽  
Continuous Wavelet ◽  
Optical Wireless ◽  
Wireless System ◽  
Light Interference ◽  
Artificial Neural Network Ann

Abstract The paper investigates the performance of DWT (Discrete Wavelet Transform) and CWT (Continuous Wavelet Transform) techniques based on On – Off keying modulation (OOK) for reduced BER with increase in SNR in optical wireless system. In this work, the effects of Inter-symbol Interference (ISI) and light interference on Artificial Neural Network (ANN) receiver are analyzed and reported. In proposed optical wireless system the On- Off Keying (OOK) modulation is used at receiver to analyze BER and SNR. It is further concluded that error prospect in the received signal relates to the noise level, which is given in terms of obtained SNR value.

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