Hand-held pointing device and operation method thereof

An operation method for a hand-held pointing device, the hand-held pointing device comprising a main body, a first image sensing device, a light emitting device and a second image sensing device, the main body comprising an axial direction, a first surface and a second surface, the hand-held pointing device can be hold along the axial direction, the first surface and the second surface comprising a first transparent area and a second transparent area, respectively, the second surface being parallel to the axial direction and for lying on an operating surface, the first image sensing device being disposed in the main body and configured to sense a first image through the first transparent area, the light emitting device being disposed in the main body and configured to emit a light source through the second transparent area, the second image sensing device being disposed in the main body and configured to sense a second image through the second transparent area, the operation method comprising:

• generating a first determination result by determining whether the first image contains an image of a reference light source or not;
• generating a second determination result by determining whether the second image contains an image of the operating surface reflecting the light source or not;
• and
• determining and operating the hand-held pointing device either in a remote controller mode or in a mouse mode according to the first and second determination results.

A hand-held pointing device, comprising:

• a main body comprising a first surface and a second surface, wherein the first surface and the second surface comprise a first transparent area and a second transparent area, respectively;
• at least an image sensing device configured to sense a first image and a second image through the first transparent area and the second transparent area, respectively;
• a light emitting device configured to emit a light source to the second transparent area while the image sensing device is sensing the second image;
• and
• a processing circuit configured to control the image sensing device to sense the second image, determine a luminance parameter of the second image, and determine either to control the image sensing device to switch to sense the first image or keep sensing the second image according to the determined luminance parameter.