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autofocus method

A technology of auto-focus and focus position, which is applied to focusing devices, TVs, color TVs, etc., can solve the problems of high time consumption, achieve accuracy and less time-consuming, reduce search time, and reduce search times.

Inactive Publication Date: 2017-08-25
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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AI Technical Summary

Problems solved by technology

The search result of the global search method is the most accurate among the focusing methods in the prior art, but the required search time and the number of times of moving the lens are the most, so the most time is consumed

Method used

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Embodiment Construction

[0011] The auto-focus method provided by the embodiment of the present invention is used to judge and determine the position of the lens in electronic devices such as cameras and mobile phones. The lens is driven by a voice coil motor, and the displacement of the lens varies with the current value input to the voice coil motor. In other words, the lens is moved to different positions to obtain images according to the input current value.

[0012] Please refer to figure 1 and figure 2 , the autofocus method includes the following steps:

[0013] S1. Randomly select three current values ​​within the operating current range of the voice coil motor to move the lens to different positions to obtain three images, and calculate and record the sharpness values ​​of the three images.

[0014] Specifically, randomly select three current values ​​(for example, between 10 mA and 60 mA) within the operating current range of the voice coil motor to input the voice coil motor to drive the...

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Abstract

An autofocus method for judging the position of the lens. The lens is moved according to the input current value. The autofocus method randomly obtains three current values ​​and obtains the corresponding sharpness, and uses the three current values value to get the first curve, and then take out the current value corresponding to the highest point of the first curve, use the current value to get the clarity, and then use the three points with high definition among the four points to get the second curve, and take out the value of the second curve The current value corresponding to the highest point, if the current value of the highest point of the first curve and the current value of the highest point of the second curve are within a predetermined range, the search is completed; otherwise, the second curve is obtained repeatedly, and the highest point of the second curve is The corresponding current value drives the lens to move until the difference between the current value corresponding to the highest point of the (N+1)th curve and the current value corresponding to the highest point of the Nth curve falls within the predetermined range, where N is greater than or equal to 2 Positive integer until the difference of the current value is within the predetermined range.

Description

technical field [0001] The present invention relates to an automatic focusing method, in particular to a fast automatic focusing method. Background technique [0002] Electronic products such as digital cameras and mobile phones with camera functions are very common photographic devices. These electronic products must focus on the correct object to obtain good photo quality. Therefore, the automatic focus method is very important. [0003] There are some auto-focus search methods in the prior art, for example, a global search method (global search). The global search method is to record the image obtained by moving the lens every step and calculate the sharpness of the image. When the lens is moved to all search positions in sequence and the sharpness of the image is obtained, the search is completed, and then the image with the maximum clarity is taken out. The position of the lens corresponding to the image, and move the lens to this position to complete autofocus. The s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B13/36G02B7/36H04N5/232
Inventor 林国宏
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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