Nowadays, with huge progress in digital imaging, new image processing methods are needed to manage digital images stored on disks. Image retrieval has been one of the most challengeable fields in digital image processing which means searching in a big database in order to represent similar images to the query image. Although many efficient researches have been performed for this topic so far, t...

Pipelining is a means of obtaining fast sampling and processing speed in hardware implementation of digital systems and it requires a look ahead system model for the pipelined system. However, existing methods for the design of look ahead system models are only for stable systems and hence are not applicable to unstable digital controllers for closed loop system control. In this paper a periodi...

Aerial photographs have been evaluated manually by the operators for a long time for the extraction of the vector data. The development of computer technology and digital image processing technologies provide to perform these extraction processes automatically or semi-automatically. Image segmentation can be used for automatic and semi-automatic feature extraction and classification of images. ...

This paper proposes an efficient implementation of Fast Composite Length FIR algorithms on the Digital Signal Processor (DSP) "ADSP-2100", which closely follows the mathematical structure of the algorithm. The difficulty is to keep as much as possible the improvement brought by the reduction of the complexity without exceeding the DSP difficulty was already pointed out in previous papers, in wh...

A large flexible beam with a tip mass-pendulum system has been proven to be effective vibration-absorbing device for large flexible structures with tip appendages. In this study, the technique of digital image processing is used to demonstrate how unique experimental results can be obtained by the use of high performance data acquisition and high speed cameras. The measurements include time his...

In this paper, we present several techniques of digital image processing that can be used in the recovering of damaged graphical documents. The ancient graphical documents give an important information in several subjects like history, ethnography or architecture reconstruction and then a good conservation and recovering is an important issue. The techniques presented are especially important w...

Watermarking is largely used for copyright protection and fast search of images in databases. Another method for securely identifying images is to use hash functions. Digital Signature Standard, used in cryptosystem to dispute authentication documents, is based on hash functions. A digital signature is a bit stream dependent on key and content of document. For each document, the digital signatu...

Recently, joint analysis and optimization of both the optical sub-system and the algorithmic capabilities of digital processing have created new digital-optical imaging systems with system-level benefits. We explore a special class of digital-optical imaging systems called spherical coding that combine lens systems having controlled amounts of spherical aberration with digital sharpening filter...

Reconfigurable hardware has become a wellaccepted option for implementing digital signal processing. Traditional devices such as field-programmable gate arrays offer good fine-grain flexibility. More recent coarse-grain reconfigurable architectures are optimized for word-length computations. We have developed a medium-grain reconfigurable architecture that combines the advantages of both approa...