Image authentication and restoration using watermarking
Image data means the representation of real-life graphics in digital form that can be processed by computers. The word digital here means that the data in this representation are discrete. Image files are usually large because an image is two dimensions and can be displayed in many colors. The loss...
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| Format: | Final Year Project |
| Language: | English |
| Published: |
2009
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| Online Access: | http://hdl.handle.net/10356/16753 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Image data means the representation of real-life graphics in digital form that can be processed by computers. The word digital here means that the data in this representation are discrete. Image files are usually large because an image is two dimensions and can be displayed in many colors. The loss of some image features is acceptable as long as human system can tolerate.
The objective of the project is to develop an image compression system to extract into 8×8 blocks. The 2D discrete cosine transform (DCT) needs to be done to transform the image that is previously input and extracted into 8x8 blocks. Quantizers are to be developed to quantize the image and the encoder produces the compressed bit-stream for transmission or storage. To decode the image, dequantizers and inverse cosine transform (DCT) needs to be done. Optimization is to be done to check whether the reconstructed image has almost the quality with the original one. |
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