Sentence examples for the colour table from inspiring English sources

Extraction algorithm (1) Create the colour table based on ; (Note no cluster expansion is needed).

Each circle represents a colour in the colour table to be clustered.

Create the colour table based on ; (Note no cluster expansion is needed).

A -means clustering algorithm is then applied to cluster the colours in the colour table into clusters/groups.

Whether an image has a large homogeneous area can be determined by the size of the colour table.

However, we observed that the size of the colour table of -pixel images normally varies from 100,000 to 700,000.

The cluster expansion algorithm is presented in Algorithm 2. After applying the cluster expansion to all clusters in the original colour table, the result is an expanded colour table.

The data hiding process is straightforward and is presented in Algorithm 3. At the receiving side, the recipient has to construct the same colour table according to the received image, and then apply the same PEC algorithm on in order to obtain the same clustering configuration.

As a result, the recipient of the stego-image cannot obtain the same colour table as used at the embedding side; consequently he/she is unable to make the correct extraction.

The reason of doing so is to ensure that after hiding the secret data, all the physical and virtual colours will be present in the stego-image such that the recipient of the stego-image can re-establish the same colour table and cluster configuration in the data extraction process.

To ensure the appearance of every virtual colour in the stego-image and subsequently allow the recipient to reconstruct the same colour table, some pixels have to be chosen to have their original (physical) colours replaced with the virtual colours before data hiding takes place (step (4) of Figure 1).