Content of research

This research is aimed to add value to media information and communication technology using sub-channel data communication with information hiding technology.
As an application example, this study investigates high-fidelity sound of the voice on the telephone. With the proposed method, information for widening the bandwidth is embedded in the voice data in advance at the transmitter side, so that the voice can have high-fidelity on the receiver side.
This research also investigates a method for detecting tampering by embedding information that can guarantee the originality by image data. Figures 1 to 3 show an example of the proposed method for detecting tampering with a car license plate. When an image is tampered with, the corresponding part of the image is revealed, and the proposed method will not only detect the tampering, but also the tampered part.

Potential for social implementation

• ・Repair of media data degraded by communication errors that occur in IP phones, IP TVs and other devices, in principle.
• ・Improving the fidelity of media data degraded by bandwidth limitations
• ・Detection of tampering with media data

Appealing points to industry and local governments

To exchange information robustly even in the event of a disaster or other problems, it is important to support the standard formats that are implemented in many devices. The concept of this research, which adds new functions without changing the standard format and maintains compatibility with existing devices, is an important perspective to consider information communication in case of trouble.