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Image matching method of optical indicating device

A technology of a pointing device and a matching method, applied in image analysis, image data processing, input/output process of data processing, etc., can solve problems such as inaccurate results and excessive calculation amount, and improve calculation speed and reduce power consumption Effect

Inactive Publication Date: 2011-04-06
APEXONE MICROELECTRONICS SHANGHAI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide an image matching method applied to an optical pointing device, which overcomes the defects of excessive calculation and inaccurate results in the prior art by using feature point matching to obtain the best matching block

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  • Image matching method of optical indicating device
  • Image matching method of optical indicating device
  • Image matching method of optical indicating device

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Embodiment approach

[0019] The method of implementing the present invention is used in computer or video system pointing device, and the pointing device is provided with a photosensitive detector array for optically sensing the image of the external object, thereby sensing the motion of the object. This method uses image feature information to match the reference block and the search block. For other background technologies, please refer to Chinese patent applications 200680000973.9 and 200710196741.1.

[0020] figure 1 is a schematic diagram representing a two-dimensional image collected by a photosensitive detector array of an optical pointing device, figure 2 is from figure 1 The schematic diagram of the distribution of the pixel value (brightness) of each pixel in the sampled one-dimensional image is figure 1 The schematic diagram of the distribution of the pixel values ​​of each pixel in the one-dimensional image AB in the X direction or the one-dimensional image CD in the Y direction of ...

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Abstract

The invention relates to an image matching method of optical indicating device which comprises the steps as follows: an photosensitive detector array is used for obtaining two frames of images of an external object to form a reference frame and a target frame; overlapping area of the reference frame and the target frame is estimated, a reference block is selected from the overlapping area of the reference frame and a plurality of searching blocks are selected from the overlapping area of the target frame; if brightness of a pixel in the reference block or the searching block is higher than brightness of two adjacent pixels thereof, the pixel is a bright spot; if brightness of the pixel is lower than brightness of the two adjacent pixels thereof, the pixel is a dark spot; positions of the bright spots and dark spots of the reference block and each searching block are matched and compared, thereby determining numbers of position-matched pixels; the searching block with the largest position-matched pixel numbers is the best matching block which can be used for determining shift of the optical indicating device.

Description

【Technical field】 [0001] The invention relates to an image matching method of an optical pointing device, in particular to a method for determining displacement by means of image matching applied to optical pointing devices such as a photoelectric mouse. 【Background technique】 [0002] Among various computer peripheral devices, the mouse is one of the most frequently used computer peripheral devices by users. But when the user moves the mouse on the work surface, the motion-sensing device inside the mouse senses the movement and controls the corresponding movement of the pointer on the computer screen. The optical sensing device in the prior art generally includes a light-emitting device (such as a light-emitting diode) and a photosensitive detector array, wherein the photosensitive detector array is usually arranged in a two-dimensional array to sense the movement characteristics of the mouse on the work surface, The judgment and calculation of the mouse movement displacem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/033G06T7/20G06F3/0354
Inventor 肖勇邵菊花谢承华
Owner APEXONE MICROELECTRONICS SHANGHAI