公开(公告)号：US20110304587A1

公开(公告)日：2011-12-15

申请号：US12979098

申请日：2010-12-27

申请人： CHENG-NAN TSAI ,  TZUNG-MIN SU ,  CHIH-HSIN LIN

发明人： CHENG-NAN TSAI ,  TZUNG-MIN SU ,  CHIH-HSIN LIN

IPC分类号： G06F3/042

CPC分类号： G06F3/042 ,  G06F3/0416 ,  G06F3/0428 ,  G06F2203/04104 ,  G06F2203/04108

摘要： An apparatus and a method for acquiring object image of a pointer are provided. The apparatus is suitable for an optical touch system and is used for acquiring an object image of a pointer when the pointer interacts with a touch surface of the optical touch system. The apparatus includes an image sensor and a processing circuit. The image sensor is used for acquiring an image of the touch surface. When the pointer approaches the touch surface, the processing circuit compares at least a part of the information of a sensed image with a threshold value, so as to determine a comparison range. Then, the processing circuit determines another threshold value according to the image information in the comparison range. Afterwards, the processing circuit compares the image information in the comparison range with the aforementioned another threshold value, so as to acquire an object image of the pointer.

摘要翻译： 提供了一种用于获取指针的对象图像的装置和方法。 该装置适用于光学触摸系统，并且当指针与光学触摸系统的触摸面相互作用时用于获取指针的对象图像。 该装置包括图像传感器和处理电路。 图像传感器用于获取触摸表面的图像。 当指示器接近触摸表面时，处理电路将感测图像的信息的至少一部分与阈值进行比较，以便确定比较范围。 然后，处理电路根据比较范围内的图像信息来确定另一阈值。 之后，处理电路将比较范围内的图像信息与上述另一个阈值进行比较，以获取指针的对象图像。

公开(公告)号：US20110304588A1

公开(公告)日：2011-12-15

申请号：US12983366

申请日：2011-01-03

申请人： CHENG-NAN TSAI ,  Tzung-Min Su ,  Chih-Hsin Lin

发明人： CHENG-NAN TSAI ,  Tzung-Min Su ,  Chih-Hsin Lin

IPC分类号： G06F3/041

CPC分类号： G06F3/0416 ,  G06F3/0428 ,  G06F2203/04104 ,  G06F2203/04108

摘要： An optical touch system, an apparatus and a method for calculating the position of an object are provided. The apparatus includes an image sensor and a processing circuit. The processing circuit selects at least one dot from a curve segment of a brightness distribution profile obtained from a background image, wherein the curve segment corresponds to an imaging range of an object. And the processing circuit regards the column pixel brightness value corresponding to the dot as a brightness reference value. Afterwards, the processing circuit calculates brightness difference between the brightness reference value and the column pixel brightness values corresponding to the dots of a curve segment of a brightness distribution profile obtained from a sensed image, so as to further calculate a gravity of the imaging range. After that, the processing circuit regards the gravity as a representative position of the object in the sensed image.

摘要翻译： 提供了一种用于计算物体的位置的光学触摸系统，装置和方法。 该装置包括图像传感器和处理电路。 处理电路从从背景图像获得的亮度分布轮廓的曲线段中选择至少一个点，其中曲线段对应于物体的成像范围。 并且处理电路将与点对应的列像素亮度值视为亮度基准值。 之后，处理电路计算亮度基准值和与感测图像获得的亮度分布曲线的曲线段的点对应的列像素亮度值之间的亮度差，以进一步计算摄像范围的重力。 之后，处理电路将重力视为感测图像中物体的代表位置。