Automatic focusing method of camera

An automatic focus and camera technology, which is applied in focusing devices, cameras, optics, etc., can solve problems such as increasing the amount of calculation, and achieve the effect of accurate focusing

Active Publication Date: 2013-07-24
SANLI VIDEO FREQUENCY SCI & TECH SHENZHEN
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Problems solved by technology

[0014] However, if the method 1 is used when the main object is not in the center of the screen, there will be a big defect
Although methods 2 and 3 are adapted to the situation where the main scene is offset to a certain extent, both methods are at the cost of increasing the amount of calculation and introducing more backgrounds

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Embodiment Construction

[0024] In order to describe the technical content, structural features, achieved goals and effects of the present invention in detail, the following will be described in detail in conjunction with the embodiments and accompanying drawings.

[0025] In the two types of window selection in the background art, only the images that human eyes pay more attention to are often selected as the basis for calculation. But in the field of monitoring, there will be more important information in the upper half of the screen and the left and right measurements, which are ignored in the above two methods. To this end, this paper proposes the following window selection method.

[0026] see Figure 4 , the present invention provides a kind of camera automatic focusing method, it comprises steps,

[0027] A), screen division, the screen is divided in a grid-like manner; preferably, the number of rows and columns in the grid-like division here are the same.

[0028] As an embodiment, the grid...

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Abstract

The invention provides an automatic focusing method of a camera. The automatic focusing method is characterized in that respective treatment is provided for selection of focusing windows correspondingly to normal illumination and low illumination, and on the basis without increasing excessive calculation, the inclusion of information at the upper half part, the left side and the right side of a picture in the focusing process is considered. A focus-adjusting search control strategy adopts an improved hill-climbing algorithm and comprises the steps of: firstly carrying out rough adjustment, then finding an extreme point by function fitting, driving a motor to reach near the extreme point, and then adopting a small-step method to carry out fine adjustment near the extreme point by the hill-climbing algorithm so as to enable the focusing to be more accurate. For the evaluation of the image definition, a Brenner function is adopted as an evaluation function of automatic focusing and is suitable for quickly finding the clearest point of the image in a manner of matching with the focusing process.

Description

technical field [0001] The invention relates to a picture imaging method, in particular to a camera automatic focusing method. Background technique [0002] Today, as the concept of safety is becoming more and more important, the importance of security monitoring systems is also becoming more and more prominent, especially in some sensitive places, such as banks, prisons, highways, etc. For the needs of safety and management, people need to know what happened in these places events and monitor these locations. Due to the monitoring needs of these special places, more and more integrated cameras that can automatically zoom and focus are being demanded. In the integrated camera, the automatic focus technology is the core technology of the camera. Whether the automatic focus can be realized quickly and accurately is the key to evaluate the quality of the integrated camera. The focusing speed and effect are good or bad, which directly affect the user's capture and video record...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B13/36
Inventor 张君
Owner SANLI VIDEO FREQUENCY SCI & TECH SHENZHEN
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