A design of sign video image expander for HDMI source using bicubic interpolation

This paper describes a device for real-time expanding sign language images inserted in any TV programs by 2×2 scale factor. Bicubic interpolation is used as an image expansion method. The 2×2 scale factor simplifies the bicubic interpolation formula to just division by two operations which enables an efficient hardware implementation. As a prototype version, the proposed architecture is implemented on a Xilinx Zynq board with a Zynq-7020 SoC. The location and size of the expanding area can be adjusted to capture the sign language images using its onboard push buttons. Experimental results show that the proposed implementation can be compatible with 1080p (1920×1080) 60 Hz HDMI video source. Target users are the deaf people who cannot clearly see the existing sign language images because of its small size.