Given an object image and its desired size, position, and orientation in the QR code, our system automatically converts the object image to a halftone image If using the method of Chang et al. [2009], and applies an image filter [Kyprianidis and Dollner 2008] to generate an importance map Im of object image (see Figure 3). The importance map highlights salient image features and is later used to guide the QR code generation.