Abstract: The invention discloses a light compensation method applied in an optical touch system. The optical touch system includes a light emitting diode, an optical detector, and a reflector. The light emitting diode is used to illuminate toward the reflector. The reflector has a pattern. The optical detector is used to sense the illuminated reflector. The light compensation method of the invention provides a light compensation solution for overly brightness or light decay of the light emitting diode due to usage over a long period in the optical touch system.

Abstract: A lens module is provided. The lens module comprises at least one square-shaped lens, a square-shaped filter, a circuit module and a plate base. The square-shaped lens comprises a light-transmitting part and two wings formed on two sides of the light-transmitting part. The circuit module comprises a light sensor. The first surface of the plate base comprises a plurality of slots, wherein the square-shaped lens, the square-shaped filter and the circuit module can be adapted to the slots respectively. A sidewall of the plate base further comprises an incident hole to make an incident light pass vertically through the square-shaped lens and the square-shaped filter and further sensed by the light sensor to generate an image signal to the circuit module.

Abstract: A calibrating apparatus for an image processing apparatus is disclosed. The calibrating apparatus comprises a first operating module and a second operating module. The first operating module determines a third indicating point and a fourth indicating point according to a first indicating point, a second indicating point, and a specific point, and determines a calibration point (i.e. the predetermined position of a sensor) according to a first line through the first indicating point and third indicating point and a second line through the second indicating point and fourth indicating point. The second operating module forms reference lines according to reference points and the calibration point, forms reference angles according to the reference lines and a parallel line, generates reference coordinates of the reference points in an image and generates a calibration function according to the reference coordinates of the reference points and the reference angles.

Abstract: The invention provides an image processing apparatus for generating coordination calibration points. The image processing apparatus includes a subtracting module, an edge detection module and an intersection point generation module. The subtracting module subtracts a first image from a second image to generate a first subtracted image, and subtracts the first image from a third image to generate a second subtracted image. The edge detection module performs an edge detection process for the first subtracted image to generate a first edge image, and performs the edge detection process for the second subtracted image to generate a second edge image, wherein the first edge image includes a first edge and the second edge image includes a second edge. The intersection point generation module generates, according to the first and second edges, an intersection point pixel, serving as the coordination calibration point corresponding to the first edge and the second edge.

Abstract: A coordinate determining system is disclosed. The coordinate determining system comprises an image capturing module, a dividing module, a determining module, and a converting module. The image capturing module is used for capturing a plurality of images corresponding to the screen. The dividing module is used for dividing an overlapping image region of the images into a target image comprising a plurality of sub-regions. The determining module is used for determining a position of the indicating point on the target image. If the indicating point is in a target sub-region among the sub-regions and has an image coordinate relative to an original of the target sub-region, the converting module will convert the image coordinate into the screen coordinate according to a proportional parameter.

Abstract: The invention provides a system for distinguishing multiple touch points. The system comprises a panel, a first image capturing unit, a second image capturing unit, at least one third image capturing unit, and a processing unit. N touch points are indicated on the panel. A first image and a second image related to the N touch points are captured by the first image capturing unit and the second image capturing unit. At least one third image related to the N touch points is captured by the at least one third image capturing unit. N sets of coordinates corresponding to the N touch points are calculated by the processing unit according to the first image and the second image. And, a set of real coordinates corresponding to the N touch points is determined from the N sets of coordinates according to the at least one third image.

Abstract: The invention discloses a cursor control method applied to a presentation system. The presentation system comprises a computer, an imaging plane, an optical pointer, a camera, and a projector. The projector is a mobile or built-in projector of the computer for projecting output from the computer onto the imaging plane, wherein the output of the computer comprises an internal cursor generated by the computer. The optical pointer is used for projecting an external cursor onto the imaging plane. The camera is a mobile or built-in camera of the computer for capturing an image of the imaging plane. After capturing the image, a processor of the computer detects both a first position of the external cursor and a second position of the internal cursor corresponding to the image, calculates a shift vector between the first and second positions, and moves the internal cursor based on the shift vector.

Abstract: In a display system, the invention discloses a stereoscopic image format transformation method being used for transforming a non-interlace format of a stereoscopic image into an interlace format. When an aspect ratio of the stereoscopic image is not equal to an aspect ratio of a panel, the stereoscopic image format transformation method of the invention can be used for interlacing a left-eye image data and a right-eye image data of the stereoscopic image according to a format of the stereoscopic image, the aspect ratio of the panel, and the aspect ratio of the stereoscopic image, forms a completely interlaced stereoscopic image.

Abstract: The invention discloses a method for displaying a stereoscopic image, wherein the stereoscopic image includes a first-eye image and a second-eye image. The method is to firstly calculate a shift of the first-eye image with respect to the second-eye image. Then, the method moves the first-eye image for a length of a shift. Afterward, the method outputs the moved first-eye image and the second-eye image to display the stereoscopic image. Thereby, the parallax of the stereoscopic image is adjusted, so as to enhance the synthesizing effect of the stereoscopic image created.

Abstract: The invention discloses an image processing apparatus for adjusting the saturation of an input image. The input image also has lightness and hue. The image processing apparatus includes a first processing unit, a second processing unit, a third processing unit, and a converter. According to the lightness, hue, and a first LUT, the first processing unit determines a gain curve. According to the lightness, hue, and a second LUT, the second processing unit determines a normalized limit gain and multiplies the normalized limit gain by the saturation of the input image to generate a normalized saturation. According to the gain curve and a third LUT, the third processing unit determines a set of gain parameters and, according to the normalized saturation and the gain parameters, determines a gain of saturation. According to the gain of saturation, the converter is used for adjusting the saturation of the input image.