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An Implementation of the Median Filter and Its Effectiveness on Different Kinds of Images. Kevin Liu 2006-2007 Thomas Jefferson High School for Science and Technology. Abstract. Digital image filtering techniques Effectiveness of the median filter with different inputs.

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an implementation of the median filter and its effectiveness on different kinds of images
An Implementation of the Median Filter and Its Effectiveness on Different Kinds of Images

Kevin Liu

2006-2007

Thomas Jefferson High School for Science and Technology

slide2

Abstract

  • Digital image filtering techniques
  • Effectiveness of the median filter with different inputs.
  • Scenery, objects, and people
  • Criteria: noise reduction and extent of blurring
slide3

Introduction and

Background

  • Digital image processing first developed in the 1960's
  • Clear out noise or useless and distracting information in pictures
  • Missing pixels and wrong pixels
  • Inevitable when converting analog information into a digital form
  • transmission of image files from one location to another through physical mediums or through wireless communication.
slide4

Larger Purpose

  • Processing and enhancing digital images
  • The effectiveness of the median filter on different images
  • When to use the median filter
  • Blurring effects
slide5

Procedures and Methods

  • Varying intensity – size of window
  • Java – low number of Java classes
  • Noise introduction Module
  • Objects, people, scenery
  • Noise elimination quality
  • Extent of reduction in quality
slide6

Median Filter

  • Sliding window
slide7

Development

  • One module
  • 3 by 3 sliding window
  • Insertion Sort
  • Ignores edges
  • Noise introduction – percent probabibility
slide8

Sample Effects

  • Noise reduction
  • Noise reduction
slide9

Sample Effects

  • Blurring Effects
slide10

Sample Effects

  • Blurring Effects
slide11

Conclusions

  • Noise elimination equally effective
  • Reduction in quality most severe in scenery
  • Followed by people
  • Objects least affected