| Secure transmission of data is a vital area of research due to increasing identity theft issues. In this study, texts and images that are encoded by a transmitter device are steganographed into Quick Response (QR) codes and sent to a receiver. The security of this data transmission is then evaluated and compared to a previously used method. Specifically, the Differential Phase Shift Keying (DPSK) modulation method was run in conjunction with the Orthogonal Frequency Division Multiplexing (OFDM) technique, and its transmission efficiency was compared to the Phase Amplitude Modulation (PAM) method. The transmission efficiency was measured by performance timing, lenient behavior to camera movements, and picture blurring due to both added noise during transmission and light spreading in the adjacent pixels of a Liquid Crystal Display (LCD) display. In addition, result of image transmission with and without image compression were compared. Results showed that the DPSK modulation method exhibits superior transmission efficiency across all three parameters compared to the PAM method and image compression degrades quality of received image with minimizing image size. |
