Image Manipulation and Recovery

The Effects Of Class Advisers In Improving Students’ Learning Outcomes And Integration In Tishk International University’s Life.
June 14, 2021
Innovative Teaching Skills in Science
June 8, 2021

Faculty: Science
Department: IT
Type of the workshop: International Workshop (Online)
The workshop in brief:

The wide distribution of digital images in social media and electronic devices has made the process of tampering with these images easily available. Hence it is required to discover tampered areas in images and restore original ones. The workshop presented an introduction to digital image manipulation and tempering and their representation in computer systems. In addition, a mathematical representation of lifting wavelet transform which is used in the process of image tamper detection and recovery was presented.

Participants: Around 39 participants from Tishk International University, University Malaysia Perlis-Malaysia, Shuats University-India.

Date and time: May 19-20 , 2021 at 9:00 – 11:00 am.
Place: Online using Google Meet.

Session topics: 

Session 1:

  1. Introduction, Digital image representation.
  2. Types of digital images.
  3. Reading and modifying image pixels in MATLAB.
  4. Image Preprocessing.
  5. Time domain and Transform domain.

Lifting wavelet transform:

  1. Introduction about LWT.
  2. LWT steps and equation.
  3. Forward and reverse LWT.
  4. Mathematical example of applying LWT on 4×4 image.

Session 2:

Image Tamper detection and Recovery:

1. Algorithm flowchart

2. Algorithm Steps:

  • Approximation band usage.
  • Band distribution using average.
  • Image retrieving.

3. MATLAB code for the proposed algorithm.

4. Results and conclusions.

5. Suggested enhancement as future work.

Presenters names and affiliations:

  • Dr. Taha Basheer Taha, TIU
  • Dr. Ruzelita Ngadiran, Universiti Malaysia Perlis
Outcome of the workshop:

  1. Understanding digital images representation in computer systems.
  2. Reading and modifying images in Matlab.
  3. Application of second generation of wavelet with mathematical equations
  4. Presenting a new algorithm of image tamper detection and recovery with practical example.
  5. Discussing conclusions and future works.