WEEK 11 FYP 1

Title:
Method 3: Algorithm and Transformation (DCT)

Objective:
To research and gain information about Algorithm and Transformation (DCT)

Content/Result:

• The JPEG technology divides the picture into 8x8 pixels matrices, then it performs a diagonal scanning and quantize the pixels’ difference to the average pixel color of the 8 by 8 matrix. 

• The floating point results got from the scanning and quantizing can be truncated either to downward or upward correlating the bit values to be hidden. 

• This technology is applied mostly to JPEG compressions.

Conclusion:
The DCT helps separate the image into parts (or spectral sub-bands) of differing importance (with respect to the image's visual quality). The DCT is similar to the discrete Fourier transform: it transforms a signal or image from the spatial domain to the frequency domain.