Light source determining apparatus, light source determining method and optical tracking apparatus

An optical tracking apparatus, for tracking an object providing light with a specific frequency range, comprising:

• a housing;
• a lens, on the housing;
• a image sensing chip, for catching at least one image including object images for the object;
• a light filtering device, comprising at least one first region and at least one second region, wherein light passes through the first region and the second region to respectively generate a first region image area and a second region image area in the image caught by the image sensing chip, where the first region can pass only light with a specific frequency range, and the second region can pass not only light with the specific frequency range but also light with other frequencies, wherein the image comprises a first image region area generated via the first region and a second image region area generated via the second region, wherein at least one pixel of the first image region area is adjacent to at least one pixel of the second image region area;
• and
• a determining unit, for determining a location for the object image for the object in the image, according to luminosity for the first region image area and the second region image area;
• wherein the determining unit determines the object image is a real image, when a difference between a luminosity for the pixel of the first image region area and a luminosity for the pixel of the second image region area which is adjacent to the pixel of the first image region area is smaller than a predetermined value, and computes location information for the object according to the location for the object image in the image.

A light source determining method, for determining if a light source is a specific type light source, comprising:

• classifying a light filtering device to at least one first region and at least one second region, wherein the first region can pass only light with a specific frequency range, where the second region can pass not only light with the specific frequency range but also light with other frequencies;
• and
• sensing an image generated by the light source, wherein the image comprises a first image region area generated via the first region and a second image region area generated via the second region, wherein at least one pixel of the first image region area is adjacent to at least one pixel of the second image region area;
• determining if the light source is the specific type light source according to a relation between a luminosity difference and a threshold value, wherein the luminosity difference is difference between a luminosity for the pixel of the first image region area and a luminosity for the pixel of the second image region area which is adjacent to the pixel of the first image region area.

An optical tracking apparatus, for tracking an object providing light with a specific frequency range, comprising:

• a housing;
• a lens, on the housing;
• a image sensing chip, for catching at least one image including object images for the object;
• a light filtering device, comprising at least one first region and at least one second region, wherein light passes through the first region and the second region to respectively generate a first region image area and a second region image area in the image caught by the image sensing chip, where the first region can pass only light with a specific frequency range, and the second region can pass not only light with the specific frequency range but also light with other frequencies, wherein the image comprises a first image region area generated via the first region and a second image region area generated via the second region, wherein at least one pixel of the first image region area is adjacent to at least one pixel of the second image region area;
• and
• a determining unit, for determining a location for the object image for the object in the image according to a relation between a luminosity difference and a threshold value, wherein the luminosity difference is difference between a luminosity for the pixel of the first image region area and a luminosity for the pixel of the second image region area which is adjacent to the pixel of the first image region area.