Software testing is a critical element of software quality assurance and represents the ultimate reviews of specification, design and coding. Testing represents interesting anomaly for the software. During earlier definition and development phases, it was attempted to build software from an abstract concept to tangible implementation. The testing phase involves the testing of the developed system using various test data. Preparation of the test data plays a vital role in the system testing. After preparing the test data the system under study was tested using those test data. While testing the system, errors were found and corrected by using the following testing steps and corrections are also noted for future use. Thus, a series of testing is performed for the proposed system, before the system was ready for the implementation.



Testing is the process of detecting errors.Testing performs a very critical role for quality assurance and for ensuring the reliability of software.The results of testing are used later on during maintainence also
The aim of testing is often to demonstrate that a program works by showing that it has no errors.The basic purpose of testing phase is to detect the errors that may be present in the program.Hence one should not start testing with the intent of showing that a program works,but the intent should be to show that a program
Doesn’t work.
.
Testing Objectives:
The main objective of testing is to uncover a host of errors, systematically and with minimum effort and time. Stating formally, we can say,
• Testing is a process of executing a program with the intent of finding an error.
• A successful test is one that uncovers an as yet undiscovered error.
• A good test case is one that has a high probability of finding error, if it exists.
• The tests are inadequate to detect possibly present errors.
• The software more or less confirms to the quality and reliable standards.

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ABSTRACT :

A DIGITAL watermark is a digital signal or pattern inserted into a digital image. Since this signal or pattern is present in each unaltered copy of the original image, the digital watermark may also serve as digital signature for the copies.

Digital watermarking is also to be contrasted with public key encryption, which also transforms original files into another form. Unlike encryption, digital watermarking leaves the original digital data basically intact and recognizable. Digital watermarks are designed to be persistence in viewing, printing or subsequent retransmission or discrimination. Thus, watermarking does not prevent copying but it deters illegal copying by providing a means for establishing the original ownership of a redistributed copy.
Watermarking data for copyright protection is an accepted technique adopted for digital information. This subject has been quite exhaustively researched and several techniques have been established for protecting copyright for still images, audio and video files.
The main aim of this project is to propose a possible new technique for watermarking on images.
Digital Watermarking is a robust and efficient digital image water marking algorithm using the Fast Hadamard Transform is proposed for the copyright protection of digital images. This algorithm can embed or hide an entire image or pattern as a watermark such as a company’s logo or trademark into the original image. The performance of the proposed algorithm is evaluated using the Stirmark, which consists of 90 different types of image attacks. Results show that the proposed algorithm is very robust and can survive most of the stirmark attacks.

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INTRODUCTION

Overview of The Project

PRESENT SYSTEM: -

Digital Watermark is an invisible mark inserted into the digital multimedia data so that it can be detected in the later stage of evidence of rightful ownership. A great deal of research efforts has been focused on digital watermark in recent years. The techniques proposed so far can be divided into two main groups of according to the embedding domain of the container image.

1) Spatial Domain Approach:

One group is SPATIAL domain approach .The earliest watermarking techniques are mainly this kind and the simplest example is to embed the watermark into least significant bits(LSB) of the image pixels. However, this technique has relatively low information hiding capacity and can be easily erased by lossy image compression.

2) Frequency Domain Approach:

The other group is FREQUENCY domain approach. This can embed more information bits and is relatively robust to attacks. They embedded a Guassian distributed sequence into the perceptually most significant frequency components of the container image. Another technique embedded an image watermark into selectively modified middle frequency of discrete cosine transform coefficients. One more algorithm embedded watermark using Fourier transformations that is invariant to image manipulations or attacks due to rotation scaling and translation. Still several methods used to hide the data to the frequency domain such as HVS, JND.

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