Displacement detection device and method for dynamically adjusting image sensing area thereof
A technology of displacement detection and image sensing, which is applied in the direction of image communication, color TV parts, TV system parts, etc., can solve the problems of insufficient accuracy, large power consumption of the known optical mouse, etc., and reduce power consumption Effect
Active Publication Date: 2014-11-05
PIXART IMAGING INC
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Problems solved by technology
However, the known displacement detection method has the problem of insufficient accuracy
Therefore, the user cannot make the moving indicator have a higher moving speed according to the dynamic reference frame
Furthermore, the known optical mouse has energy-consuming components such as a light source, a digital signal processor, and an image sensor, so the overall power consumption of the known optical mouse is large.
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[0050]Various exemplary embodiments will be described more fully hereinafter with reference to the accompanying drawings, in which some exemplary embodiments are shown. However, inventive concepts may be embodied in many different forms and should not be construed as limited to the illustrative embodiments set forth herein. Rather, these exemplary embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the inventive concept to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. Like numbers indicate like elements throughout.
[0051] It will be understood that, although the terms first, second, third etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another. Thus, a first element discussed below could be termed a second element without ...
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The invention discloses a displacement detection device and a method for dynamically adjusting an image sensing area thereof. The displacement detection device comprises a light source, an image extraction unit and a processing unit. The image extraction unit is used for extracting at least one reference image of a surface according to a fixed sampling period. The processing unit is used for computing an exposure reference value of the light source and an image characteristic value of the reference image and judging whether the surface is positioned within a first roughness coefficient range or a second roughness coefficient range accordingly. If the surface is positioned within the first roughness coefficient range, the processing unit defines a first search radius or a second search radius on the reference image to increase or decrease the image sensing area; and if the surface is positioned within the second roughness coefficient range, the processing unit defines a third search radius or a fourth search radius on the reference image to increase or decrease the image sensing area. With the method, the power consumption of the displacement detection device can be lowered.
Description
technical field [0001] The invention relates to a displacement detection device, in particular to a displacement detection device with a dynamic adjustment image sensing area. Background technique [0002] The continuous development of science and technology has led to the widespread application of computers. As the input tool of computer, mouse greatly facilitates people's operation of computer. During operation, the mouse is placed on a bearing platform, and the cursor pointer in the computer is controlled by moving the mouse on the bearing platform. With the continuous upgrading of electronic products, consumers have higher and higher requirements for electronic products. In order to improve the convenience of using computer equipment, the wireless optical mouse has gradually replaced the traditional wired mouse. A wireless optical mouse generally includes energy-consuming components such as a light source, a digital signal processor (DSP), an image sensor, and a wirel...
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IPC IPC(8): H04N5/232H04N5/235
Inventor 陈俊玮古人豪郭士维
Owner PIXART IMAGING INC