Impulse noise

About: Impulse noise is a research topic. Over the lifetime, 4816 publications have been published within this topic receiving 63970 citations.

A median/ANFIS filter for efficient restoration of digital images corrupted by impulse noise

Abstract: A new operator for removing impulse noise from digital images is presented. The proposed operator is a hybrid filter constructed by combining four center-weighted median filters (CWMF) with a simple adaptive neuro-fuzzy inference system (ANFIS). The internal parameters of the ANFIS are optimized by training. The training is performed by using simple artificial images which can easily be generated by computer. The fundamental advantage of the proposed operator over other operators in the literature is that it efficiently removes impulse noise while at the same time effectively preserves image details and texture. Performance of the proposed operator is tested at various noise densities and for different test images, and also compared with conventional as well as state-of-the-art impulse noise removal operators. Experimental results show that the proposed operator significantly outperforms the other operators and efficiently removes impulse noise from digital images without distorting image details and texture.

Multi-carrier CDMA over copper lines - comparison of performances with the ADSL system

Abstract: This paper deals with the comparison of two multi carrier modulation techniques over existing copper twisted pairs: the Discrete Multi Tone (DMT) modulation and the Multi Carrier Code Division Multiple Access (MC-CDMA) modulation The first form has been proposed for Asymmetrical Digital Subscriber Line (ADSL) However in ADSL, the wire pairs suffer from disturbances such as transients, radio-frequency noise Among them, impulse noise is considered to be one of the most damaging impairments Then, our proposal intends to limit the effects of such a noise thanks to the use of the latter form of modulation which combines multi carrier technique with spread spectrum In order to improve the performances of the system proposed still further various detection techniques are studied In this context, we show that the MC-CDMA technique presents better performances than the normalised ADSL technique under identical simulation parameters (data rate, bandwidth, transmitted power, coding, interleaver)

Protection of communication systems against repetitive electrical impulse noise

Abstract: A method limits the effect of repetitive electrical impulse noise in a communication system The presence of the repetitive electrical impulse noise is detected during communication service If the repetitive electrical impulse noise is detected, then a message is transmitted which signals that the repetitive electrical impulse noise is present Other systems and methods are disclosed

Impulse Noise Removal from Color Images with Hopfield Neural Network and Improved Vector Median Filter

Abstract: In this paper, a novel and effective method for impulse noise removal in corrupted color images is discussed The new method consists of two phases The first phase is a noise detection phase where a modified Hopfield neural network is used to detect impulse noise pixels The second is a noise filtering phase where the disadvantage of taking vector median in a single color space is addressed and a new algorithm based on performing vector median first in RGB space and then in HSI space is presented The results of simulations performed on a set of standard test images on a wide range of noise corruption show that the proposed method is capable of detecting all the impulse noise pixels with almost zero false positive rates and removes noise while retaining finer image details It outperforms the standard procedures and is yet simple and suitable for real time applications