Optical Mouse Image Contrast Enhancement for Displacement Accuracy
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Solution Overview
Problem
Optical navigating apparatuses, such as optical mice, face errors in displacement computation due to images being out of focus or having indefinite features, which are affected by factors like printed circuit board thickness and surface characteristics.
Innovation Solution
An image adjusting method that utilizes brightness information to determine if a contrast enhancing operation is needed, setting threshold values for different brightness levels, and adjusting images accordingly to generate a clearer image for more accurate displacement detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the image sensor is used to catch continuous images for displacement computation, then the optical navigating apparatus can perform navigation function, but the images may be out of focus or have indefinite features causing computation errors
Solution Approach 1:
The patent applies preliminary action by performing contrast enhancement processing on images before they are used for displacement computation. The system pre-processes the images to improve their clarity and feature definition, ensuring that the images are in optimal condition for subsequent displacement analysis. This prevents the problem of indefinite features causing computation errors.
Solution Approach 2:
The patent changes the contrast parameter of the image to improve feature clarity. By adjusting the contrast parameter through enhancement processing, the system transforms images with indefinite features into images with clear, distinguishable features, thereby improving measurement precision without affecting the navigation function.
2Manufacturing precision
If the printed circuit board thickness is controlled to fall in a predetermined range, then the image sensor can be properly positioned, but the images may still be out of focus due to other factors
Solution Approach 1:
The patent introduces image processing algorithms as an intermediary between the image sensor and the displacement computation process. This intermediary layer performs contrast enhancement to compensate for focus issues that cannot be fully addressed by mechanical positioning alone, thereby improving image focus quality without requiring changes to the printed circuit board thickness.
3Adaptability or versatility
If the optical navigating apparatus passes over surfaces with no apparent features, then the apparatus can move freely, but the image will have indefinite features making displacement detection inaccurate
Solution Approach 1:
The patent changes the contrast parameter of images captured from featureless surfaces through enhancement processing. By adjusting contrast and other image parameters, the system creates artificial feature definition in otherwise indefinite images, enabling accurate displacement detection even on surfaces with no apparent features while maintaining surface adaptability.
Data Source
AI summary
A computer readable recording media, having at least one program code recorded thereon, an image adjusting method can be performed when the program code is read and executed. The image adjusting method comprises: catching a current image; computing at least one kind of brightness information of the current image; respectively setting corresponding threshold values to different kinds of the brightness information; and determining if a contrast enhancing operation should be performed to the current image to generate an adjusted image according to a number that the brightness information is over the threshold value.