Patent ID: 8149213

Claim:
A method for executing a mouse pointer function by a portable terminal having a camera module and a screen, the method comprising: capturing an external image signal by the camera module; sampling the external image signal and converting the sampled image signal into sampled image data; mapping a group of pixels of the sampled image data to a group of pixels of an image sensor of the camera module for each unit pixel on a one-to-one basis; detecting coordinate values of the image data including a point light source in the group of the mapped pixels; determining if a brightness value of the image data is larger than a first threshold value, wherein the first threshold value is used to determine if the image data includes the point light source displaying, as a particular recognition indication, the detected coordinate values of the image data determined to include the point light source on the screen if the brightness value of the image data is larger than the first threshold value; and executing the mouse pointer function on the screen by determining if the brightness value of the image data is larger than a second threshold value, wherein the second threshold value is used to discriminate among intensity values.