Adaptive Threshold and Directional Weighted Median Filter-Based Impulse Noise Removal Method for Images

Adaptive Threshold and Directional Weighted Median Filter-Based Impulse Noise Removal Method for Images

Ashpreet, Mantosh Biswas
Copyright: © 2022 |Pages: 18
DOI: 10.4018/ijsi.297983
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Abstract

Elimination of impulse noise in image snap shots with side renovation is one of the complex duties in digital image processing. In this paper, the removal of random impulse noise is done in two important levels. In first level, the detection of the impulse noise is done on the premise of a double threshold selecting strategy after which in the another level, elimination of impulse noise is done by the usage of median filter and directional weighted median filter relying upon the noise map (Nmap) construction of corrupted pixels detected within the first level. The proposed method makes use of the statistical characteristics of noisy image graphs and the brink obtained is adaptable to one of a kind of snap shots and noise conditions. Comparative evaluation with different widespread de-noising techniques shows that the proposed method outperforms in terms of PSNR, SSIM, NMSE and Computation Time (CT) of the distinct trying out test images, with exclusive noise levels.
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1. Introduction

Noise suppression from images is one of the main elements in virtual image processing. Within the subject of image refinement, virtual images very frequently are corrupted with the resource of several styles of noise throughout the picture acquisition. The primary reasons are malfunctioning of pixels in digital camera sensors, faulty memory places in hardware, or transmitting in a loud direction. Images are often damaged with the aid of placing the Impulse noise, Gaussian noise, Shot noise, Speckle noise, and Masses of others. Upkeep of image information and suppression of noise are the two key important of image processing (Plataniotis & Venetsanopoulos, 2000). Impulse noise is of sorts: fixed valued i.e., 0 elements or 255 and the random-valued i.e., 0 to 255 (Gonzalez & Woods, 2018). The random valued impulse noise is positioned amidst 0 and 255 and it is extraordinarily tough to reduce this noise. Usually random-valued impulse noise is more difficult to detect and remove than fixed valued impulse noise. This paper focuses on removal of random-valued impulse noise in color images, which can be formulated as follows:

ijsi.297983.m01
(1) where,ijsi.297983.m02 is a pixel at location ijsi.297983.m03 in the original color image having three channels ijsi.297983.m04and can be represented as:
ijsi.297983.m05
and ijsi.297983.m06is the value of the noisy pixel coming from a uniform distribution on the interval of possible color component values with a probability of ijsi.297983.m07.

Typically, the easy idea in the de-noising is the popularity degree, which identifies the noisy and noise loose pixels of the corrupted image, contaminated image, after that noise removal detail gets rid of the noise from the noisy image beneath approach at the same time as retaining the opposite crucial elements of images. To remove impulse noise, numerous de-noising methods have been suggested. There are specific types of filter systems in spatial domain: linear and non-linear filter systems. Nonlinear techniques have shown their dominance over linear techniques due to their robust behavior against impulse noise, computational adaptness and de-noising power.

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