Patent ID: 8149334

Claim:
A PIP processing apparatus for processing a main image and a secondary image, the PIP processing apparatus comprising: a scaling circuit provided for scaling down the secondary image to output a scaled-down secondary image; a memory circuit connected with the scaling circuit for storing the main image and the scaled-down secondary image; a first selecting circuit connected with a controlling circuit for receiving an image selecting signal from the controlling circuit, and connected with the memory circuit for selecting the scaled-down secondary image or the main image as an output according to the image selecting signal; and a processing circuit connected with the first selecting circuit for processing the scaled-down secondary image or the main image, wherein the controlling circuit comprises: a plurality of first comparators for judging a position of a target pixel in a frame to output a position comparison value; a register for recording a corresponding code of a secondary image region in the frame; and a second comparator connected with the first comparators and the register for receiving the position comparison value and the corresponding code, and comparing the position comparison value with the corresponding code to output the image selecting signal.