Automatic focusing method, device and system
An automatic focus and focal length technology, applied in the field of cameras, can solve the problems of high cost of laser ranging modules, inability to focus on distant objects, and large volume of laser ranging modules
Active Publication Date: 2020-07-31
IRAY TECH CO LTD
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Problems solved by technology
Among them, if the contrast is used for focusing, when there is an object with high contrast nearby, the distant object cannot be focused, so the use scene is relatively limited
The efficiency of laser ranging aided focusing depends on the object’s reflection of light. If the object’s reflectivity of light is low, it will affect the ranging efficiency; moreover, the laser ranging module has a large volume, which is not conducive to the imaging system. The circuit design in the middle, the cost of the laser ranging module is also relatively high
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[0057] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.
[0058] At present, the commonly used AF methods are contrast focusing and laser ranging assisted focusing. Among them, if the contrast is used for focusing, when there is an object with high contrast in the vicinity, it cannot focus on the distant object, so the use scene is relatively limited. The efficiency of laser ranging assist focusing depends on the reflection of light by the object. If the reflectivity of the object is low, it wi...
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The invention discloses an automatic focusing method, device and system. According to the invention, the actual distance between a target point and a central camera is measured by using double visiblelight cameras, and the motor of the central camera is driven to perform automatic focusing according to the measured actual distance. Compared with laser ranging auxiliary focusing, the cost of the visible light camera is low, so that the implementation cost of the method is low; the method does not depend on the reflectivity of the target to the light, so that the distance measurement efficiencyis higher. Compared with contrast focusing, the method does not pay attention to the contrast of the target, so that focusing of a distant object is not affected when an object with relatively high contrast exists nearby, and the universality is relatively good. Compared with contrast type automatic focusing, a motor does not need to be repeatedly driven, the focusing efficiency is improved, andmeanwhile the requirement for a multi-depth-of-field complex scene is met.
Description
technical field [0001] The present application relates to the technical field of cameras, and in particular, to an automatic focusing method, device and system. Background technique [0002] At present, the commonly used AF methods are contrast focusing and laser ranging assisted focusing. Among them, if the contrast is used for focusing, when there is an object with high contrast in the vicinity, it cannot focus on the distant object, so the use scene is relatively limited. The efficiency of laser ranging assist focusing depends on the reflection of light by the object. If the reflectivity of the object is low, it will affect the efficiency of ranging. Furthermore, the volume of the laser ranging module is large, which is not conducive to the imaging system. The cost of the laser ranging module is also relatively high. [0003] Therefore, how to improve the efficiency and versatility of the autofocus method is a problem to be solved by those skilled in the art. SUMMARY ...
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CPCH04N23/671H04N23/67
Inventor 王培旭
Owner IRAY TECH CO LTD