1. Digital information encrypted in an image using binary encoding
Source: Optics Communications, 281, Author: Kuang Tsan Lin
Speaker: Chung-Chuan Wang
Date:

2. Outline
Introduction
Proposed method
Results
Conclusions

3. The information codes (a. plot, b. fax and c. word types)
Introduction H H＊
Information codes ＋
Host image
Overt image
The embedding system.
The information codes (a. plot, b. fax and c. word types)

4. Judge and authorize information encoded with
Proposed method (1/4)
00: plot
01: fax
10: word
Judge and authorize information encoded with
Identification codes
type codes
Record necessary parameters according to attributions
Information codes

5. Proposed method (2/4) Information codes - Plot type
1.Three bits for seven drawing codes:
001( )010( )011( )100( )101( )110( )111( )
2.m(=9) bits for a parameter (coordinate, length, angle)
, , : 4m+3(=39) bits , : 3m+3(=30) bits
: 6m+3(=57) bits : 5m+3(=48) bits
001, , , , 
(0,0)
(0,0)
(9,9)
(9,9)
r=5
111, , , , , 
(15,15)
r=5
θi=45°
θf=135°
θf=135°
θi=45°
(15,15)

6. Proposed method (3/4) Information codes - fax type
100101,100111,100010,000011,….,000000,000000
(37) (39) (end)
1369 (=3737) pixels, only 570 (=956) bits are needed.
Information codes - word type
ASCII codes with 7-bit of Capital English letters, small English letters, Arabic numbers (0–9).
For example: ‘‘I love St. John’s University” , 29 letters and symbols,
encoding it needs 203 (=297) bits of codes

7. Proposed method (4/4) H : Host image,
T : Identification, type and information codes,
H*: Overt image

8. Results a. 512×512 plot, b.256×256 fax, c. word document PSNR=52.89
128×128 host image
a. 512×512 plot, b.256×256 fax, c. word document
PSNR=47.75

9. Conclusions Method is easy and simple.
Covert information can be plot , fax and word type of data.
The overt image is almost the same as the host image.