Patent ID: 7995121

Claim:
A portable terminal system comprising: a main unit; and an imaging unit detachable with respect to said main unit, wherein said imaging unit includes: an imaging section, and a key signal generating section configured to generate a key signal based on each pixel data of imaged image data and reference data with respect to said imaged image data input from said imaging section, and to output foreground image data having said generated key signal and corresponding pixel data as a minimum configuring unit, and said main unit includes: a storage section configured to store background image data, and an image synthesizing section configured to overlap said background image data stored in said storage section and said foreground image data output from said imaging unit based on said key signal contained in said foreground image data, wherein said imaging unit further includes a conversion section configured to convert first pixel data, which is pixel data configuring said imaged image data, including one achromatic component and two chromatic components to second pixel data including three color concentration components, and said key signal generating section includes: a first key signal setting part configured to set each key signal value based on said achromatic component of said first pixel data output from said imaging section side and said reference data, and an output part configured to output said foreground image data having said key signal set by said first signal setting part and said second pixel data as a minimum unit.