Optical guidance moving direction prediction method

A technology of moving direction and optical guidance, which is applied in the field of optical indicators, and can solve problems such as mouse indicator shaking, errors, and movement errors

Inactive Publication Date: 2008-02-13
EXPLORE MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the resolution and uniformity of the image sensor (Image Sensor), when the image data is converted from analog to digital data, it will cause a slight error, and this error may cause abnormal vibration or movement of the mouse pointer.
Usually optical mouse manufacturers have two solutions: the first one is to negatively discard these error frames, so that the mouse pointer remains in place without any movement, causing the mouse pointer to jump sharply (Jump) phenomenon; the second is to still use this erroneous frame for comparison, but it does not have any ability to judge the correct direction, so it is easy to cause the mouse pointer to shake or move incorrectly

Method used

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  • Optical guidance moving direction prediction method
  • Optical guidance moving direction prediction method
  • Optical guidance moving direction prediction method

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Embodiment Construction

[0028] The present invention will be described with the prediction of the moving direction of the optical mouse. When the image sensing device of the optical mouse captures the light reflected back from the desktop, it will be converted into digital data and sent to the digital signal processor for direction prediction and judgment. .

[0029] Regarding the moving direction prediction method in the digital signal processor of the present invention, please refer to the action flow chart shown in Fig. 2, first carry out initial setting (step S201), be about to set the central position of MAD matrix as (X, Y) =(8,8), and set the moving vector of the first MAD matrix as (ΔX1, ΔY1)=(0,0), and set the moving vector of the second MAD matrix as (ΔX2, ΔY2)=( 0,0). Of course, the center position of the MAD matrix is ​​determined by the frame size, and is not limited to the set value in this example.

[0030] After that, the image sensing device will continue to capture the first image...

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Abstract

This invention utilizes the moving vectors of last two correct mean absolute difference (MAD) matrixes to be the base of direction forecast and takes the last correct rector position as the center to forecast and fins out the possible direction of multiple MAD (min) phases and dimensions of vectors in the judgment way of extending layers by layer. Each time before comparing the next frame, a candidate block replaces the reference frame at the center, so that the shift vector varies in a certain sphere.

Description

technical field [0001] The present invention relates to a method for predicting the moving direction of optical guidance, in particular to an optical indicator designed by the combination logic of complex programmable logic device (Complex Programmable Logic Device, CPLD) or special-purpose integrated circuit (ASIC), Optical identifiers, robotic arms, etc. are methods for predicting the direction of movement of optical guidance. Background technique [0002] A general optical mouse uses an image sensing device to capture the image information of the desktop, and converts the analog signal into a digital signal through an analog-to-digital converter (A / D Converter), and then converts the displacement of the mouse through a digital signal processor (DSP). The relative orthogonal pulse signal is output to the computer to control the movement of the cursor on the screen. [0003] However, in the DSP calculation processing part, the image matching (Image-Matching) of the general...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K11/06G06K9/00
Inventor 许明华黄新武王怡雯
Owner EXPLORE MICROELECTRONICS
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