ghnmqdtg / image_watermarking_using_python

A project to implement basic steganography with images.

Image watermarking using Python

Introduction

This side project is to implement basic steganography with images. Encode the first 7-K bits of the watermark into the last K bits of the target image. You can put these two files in folder ./src and set the configurations in ./config. For details, please refer to the comments in the codes.

Workflow

1. Import watermark (A) and target (B) as numpy arrays.
2. Encode the first 7-K bits of A into the last K bits of B.
3. Decode the last K bits of B and left-shift 7-K bits to reconstruct the A.

Input and Output

Input Images

Target image	Watermark image

Encoded Results

Encode to last 1 bit	Encode to last 2 bits	Encode to last 3 bits

Decoded watermark

Decode from last 1 bit	Decode from last 2 bits	Decode from last 3 bits

It's easy to encode A to B. As more bits are encoded, the more it affects the quality of the target image. On the contrary, the fewer bits the watermarks are encoded, the lower the quality of it can be restored.

Development Environment

Python 3.9.6
MacOS 12.6

How to use it?

1. Install the dependencies

   pip install -r requirements.txt

2. Update the config.py if needed

3. Run the main.py

   python main.py

<style> td { text-align: center; vertical-align: middle; } .col2 td { max-width:50%; width:50%; } .col3 td { max-width:33%; width:33%; } table { width:100%; } </style>