Abstract: Methods, systems, and apparatuses are described for generating an image stencil for a media device. A plurality of image frames from the media device may be obtained. Each of the image frames is converted to a reduced image frame, to generate a plurality of reduced image frames. Different regions of interest are identified across the reduced image frames. One region of interest may include one or more areas that are static across the reduced image frames. Another region of interest may include one or more areas that are dynamic across the reduced image frames. An image stencil may be generated using the regions of interest, where the image stencil is opaque in regions that are static across the image frames, and transparent in other regions that are dynamic across the reduced image frames. The image stencil may be stored, along with an identifier of the media device.