README

This code is the application of improved LSB pair replacement approaches to reduce distortion of watermarking image.

This code is developed in MATLAB.

Getting everything ready

Before running the code, you need get following things ready:

• MATLAB (this code in tested by R2018a)
• Grayscale images need to be stored in grayscale photo folder.
• A watermark.txt txt file contains the watermarking message, it need located in root folder.
• Following empty folders to store output watermarked images.

How to run it

LSB_RUNis the only file which is executable in MATLAB. While running it, it will automatically reading all image files in the grayscale photo folder.

The code will using following watermarking methods:

Regular LSB replacement

LSB pair

LSB dual pair

LSB triple pair

LSB ultra pair

After finishing watermarking, the following measurement methods will be used to evaluate the performance of each approaches:

PSNR

SSIM

Hae (histogram absolute error)

Outputs

• Watermarked images for each methods
• Extract message for each methods
• Three Excel documents for three measurement results

Knowledge based

Result & Evaluation

For this algorithm, we used three image quality measurement functions to test it. PSNR, SSIM and Hae. The detailed results are listing:

PSNR

SSIM

Hae

PSNR

SSIM

Hae

Compare

Future work

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