Wavelet

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  • Advantages And Disadvantages Of Discrete Wavelet Transform

    1015 Words  | 5 Pages

    Discrete Wavelet Transform DWT is a frequency based transform which is performed on wavelets. It can be 1-D, 2-D and etc. It divides an image into four sub-bands, namely  LL (Low resolution image)  HL (Horizontal)  LH (vertical)  HH (diagonal) This division can be performed up to many levels. It captures not only notion of frequency content but also temporal content. Wavelets provide a mathematical way of encoding information in such a way that it is layered according to level of detail

  • An Efficient Distributed Arithmetic Architecture For Discrete Wavelet Transform

    1036 Words  | 5 Pages

    An Efficient Distributed Arithmetic Architecture for Discrete Wavelet Transform in JPEG2000 encoder R.Karthik1, K.Jaikumar2 1, 2 Asst. Professor, Department of ECE, P. A. College of Engineering and Technology, Pollachi. 1 karthikasprof@gmail.com 2 jaikumarkarthi@gmail.com Abstract -- The JPEG 2000 image compression standard is designed for a broad range of data compression applications. The Discrete Wavelet Transformation (DWT) is central to the signal analysis and is important in JPEG 2000 and

  • Comparing Vector Quantization and Wavelet Coefficients Essays

    691 Words  | 3 Pages

    Wavelet transform is efficient tool for image compression, Wavelet transform gives multiresolution image decomposition. which can .be exploited through vector quantization to achieve high compression ratio. For vector quantization of wavelet coefficients vectors are formed by either coefficients at same level, different location or different level, same location. This paper compares the two methods and shows that because of wavelet properties, vector quantization can still improve compression results

  • Denoising Of Computer Tomography Images Using Wavelet Based Multiple Thresholds Switching

    2110 Words  | 9 Pages

    Denoising of Computer Tomography images using Wavelet based Multiple Thresholds Switching (WMTS) filter Mayank Chakraverty1 *, Ritaban Chakravarty2, Vinay Babu3 and Kinshuk Gupta4 1Semiconductor Research & Development Center, IBM, Bangalore, Karnataka, India 2New Jersey Institute of Technology, NJ, USA 3 Invntree, Bangalore, Karnataka, India 4 Indian Space Research Organization (ISRO) Satellite Centre, Bangalore, Karnataka, India 1nanomayank@yahoo.com, 2ritaban.87@gmail.com, 3vinaygbabu@gmail.com

  • A Literature Study Of Watermarking Techniques On Contrast Enhancement Of Color Images

    2165 Words  | 9 Pages

    A LITERATURE STUDY OF WATERMARKING TECHNIQUES ON CONTRAST ENHANCEMENT OF COLOR IMAGES Rajendra Kumar Mehra1, Amit Mishra2 1. Dept of ECE, M-TECH student, VITS, JABALPUR, M.P., INDIA, 2. Dept of ECE, H.O.D., VITS, JABALPUR, M.P., INDIA. ABSTRACT: In this paper a watermarking method with contrast enhancement is presented for digital images. Digital Watermarking is a technology which is used to identify the owner, distributor of a given image. If the watermarked images is low contrast & poor visual

  • Images And Images Of Images

    1341 Words  | 6 Pages

    INTRODUCTION 1.1 IMAGE An image is an artifact that depicts or records visual notion, for example a two-dimensional picture, that has a comparable appearance to some subject – normally a physical object or a person, for this reason offering an outline of it. Photos may be -dimensional, which includes a photo, display screen show, and as well as a 3-dimensional, inclusive of a statue or hologram. They may be captured by optical devices – such as cameras, mirrors, lenses, telescopes, microscopes, and

  • Biometric Codes Are Used For Recognising A User On The Basis Of Biometric

    2267 Words  | 10 Pages

    Abstract Biometric systems are used for recognising a user on the basis of biometric traits he have. During authentication some of the frequently asked questions are “Is he who he claims to be?”, “Is he a valid user for gaining access to the system?”. Biometric system answers all these questions by authenticating the users. Every second information is shared and transferred between people and it is important to make sure that what is sent by sender is what received by the receiver thus raising the

  • Strengths Of Steganography

    3830 Words  | 16 Pages

    Abstract— Steganography is a technique of hiding the secret information. Steganography hides the existence of the secret data and make the communication undetectable. Secret data can be communicated in an appropriate multimedia carrier such as image, audio or video. Image steganography is extensively used technique. In this technique secret data is embedded within the image. Steganography techniques can be categorized into two groups - adaptive and non-adaptive. Each of these have its strengths

  • Describe The Difference Between Steganography And Steganography

    1593 Words  | 7 Pages

    Security of information becomes one of the most important factors of information technology and communication because of the huge rise of the World Wide Web and the copyrights laws. Cryptography was originated as a technique for securing the confidentiality of information. Unfortunately, it is sometimes not enough to keep the contents of a message secret, it may also be necessary to keep the existence of the message secret and the concept responsible for this is called steganography [2]. Steganography

  • Advantages And Disadvantages Of Wavelets

    948 Words  | 4 Pages

    Wavelets, based on time-scale representations, provide an alternative to time-frequency representation based signal processing. Wavelets are then represented by dilation equations, as opposed to difference or differential equations. Wavelets maintain orthogonality with respect to their dilations and translations. Orthogonality of wavelets with respect to dilations leads to multigrid representation. Wavelets decompose the signal at one level of approximation into approximation and detail signals at

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