Method and apparatus for implementing semi-transparent menu display in a device for connecting HD set-top box to UHD TV

摘要

The present invention provides a method for displaying a semi-transparent menu screen while enabling connection of an existing HD-class or full HD-class set-top box, which cannot process UHD broadcasting, to a UHD TV and use thereof. The method of the present invention comprises: an image receiving step of receiving an OSD image and transparency information through a first HDMI interface from an HD set-top box, and receiving a TV image of UHD resolution through an Ethernet interface; a transparency applying step of capturing the OSD image to generate a capture image, and generating a color key screen derived by applying the transparency information to the capture image; a menu combining step of combining the color key screen with the TV image; and an output step of outputting the combined image to the UHD TV through a second HDMI interface. According to the present invention, it is possible to display a semi-transparent menu screen while connecting an existing HD-class or full HD-class set-top box, which cannot process UHD broadcasting, to a UHD TV and enabling a user to use the same.