Optical indication device image quality control method

Abstract

An image quality control method of an optical indicating device is used on the indicating device of a computer or a video system, including the following steps: obtaining a new frame image, processing the image, determining the position and the shape of the overlapping area for matching next time, extracting the characteristic value of the pixel in the overlapping area, adjusting the parameter which influences the image quality according to the characteristic value, namely the method adjusts the parameter which influences the image quality of the next frame according to the pixel value in theoverlapping area, so that the most remarkable interesting area in the matching operation achieves the ideal condition, thus overcoming the mean value of the pixel of the whole image in the prior art as the regulating basis to cause distortion of the information of the image in the next frame, further lead to the defect of computation error.

Description

【Technical field】 [0001] The invention relates to an image quality control method, in particular to a method used on an optical pointing device of a computer or a video system to control the acquired image quality. 【Background technique】 [0002] An optical pointing device, such as a mouse, is one of the most commonly used human-machine interface devices. When the user moves the mouse on the work surface, the motion sensing device inside the mouse senses the movement, thereby controlling the corresponding movement of the pointer on the computer screen. [0003] Fig. 1 is a composition block diagram of photoelectric mouse, and this mouse 1 comprises light-emitting unit (LED) 10, image sensor 11, programmable gain amplifier (PGA) 12, converter (A / D) 13, data processing unit 14 and control unit 15 , during work, the light emitting unit 10 is usually lit at a certain frequency, and emits light onto the desktop 2 on which the mouse 1 is placed. Usually, the desktop 2 has certain...

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Problems solved by technology

[0004] In order to ensure the accuracy and effectiveness of matching calculations, the industry usually adopts adjustments of exposure time, exposure intensity, or the amplification factor of programmable gain amplifiers to ensure better images, thereby ensuring the accuracy and effectiveness of matching calculations. For technology, please refer to Chinese Patent No. 01124181.0. The technical solution disclosed is to adjust the exposure time or light source exposure intensity based on the average pixel value of the current image to change the exposure amount of the pixel unit of the next frame image, so as to ensure that the image The image quality output by the sensor, the disadvantage of this method is that on some surfaces with obvious contrast, the average value of pixels considered by this method does not actually reflect the quality of the image, as shown in Figure 2 , where the blank part in the current frame is an area where the signal is too strong, and the part with shadows is an area where the signal is too weak. At this time, the average value of the pixels of the entire current frame may be ideal (that is, between 90 and 140), But in fact, most of the reference blocks participating in the matching are in the above-mentioned area where the signal is too strong, and only a small part is in the area where the signal is too weak. basis, it may lead to distortion of the information of the selected block that matches the reference block on the image of the subsequent frame, resulting in calculation errors

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