Cryptography Reference
In-Depth Information
Fig. 8.18.
Information extracting component.
8.7.2 Embedding and Extracting Experiments
We conducted a lot of embedding and extracting experiments using Qtech-
Hide&View. We will show some of the results. Our major concerns are 1)
embedding capacity, 2) before-and-after image difference, 3) embedding and
extracting speed, etc.
BPCS Embedding and Extracting
Embedding and extracting by BPCS method is a standard operation of Qtech-
Hide&View. We show our experiment using two vessel images (Image-1 and
Image-2). As for the data to embed, we prepared two folders (Folder-1 and
Folder-2) containing several files and folders underneath. Both folders included
one index.html file right under their top folders. Folder-1 is for Image-1 embed-
ding, and Folder-2 is for Image-2 embedding. Table 8.3 shows the properties
of the two images before embedding. Image-1 and Image-2 are illustrated in
Fig. 8.19 (A) and (B). Two folders for embedding are shown in Table 8.4 and
Fig. 8.20. These two folders were the largest amount of data that Image-1-bef
and Image-2-bef could embed, respectively. So, the compressed folder sizes in
Table 8.4 were the maximum embedding capacities of the two vessel images.
The folder compression was performed by a LHA compression program [22]
which was incorporated in Qtech-Hide&View.
Table 8.3.
Properties of the vessel images before embedding (RGB color).
Image name Image size BMP data size (KB) PNG data size (KB)
Image-1-bef 950713
1,986
1,492
Image-2-bef 600465
818
575
