Automatic focusing process

An automatic focus and lens technology, applied in the direction of focusing device, installation, optics, etc., can solve the problems of large amount of calculation, inconspicuous image edge information features, prolonged focusing time, etc., to achieve good adaptability, energy saving and mechanical The effect of better lifespan and improved focusing speed

Inactive Publication Date: 2008-08-13
RUITAI OPTICAL CHANGZHOU CO LTD
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Problems solved by technology

However, the edge information features of the image obtained at the defocused position of the lens are not obvious, and the extraction of this information will affect the position where it finds the best focus, and this method needs to go through multiple searches, and the amount of calculation is large, which will lengthen the time for focusing

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Embodiment Construction

[0032] The image processing-based autofocus method of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0033] Fig. 2 is the part that adopts the camera system device of described autofocus technology of the present invention to mainly include: autofocus lens 23, image sensor 24 (for example: CCD, CMOS), process image data, provide drive signal and finally give Out-of-focus position processing part 25, drive circuit part 26, mechanical part 27 (for example: stepping motor, voice coil motor, etc.). Its main working process is: the subject is imaged on the image sensor 24 through the autofocus lens 23, after the basic conversion of the image and some simple preprocessing are completed in the image sensor 24, the image data is transmitted to the processing part 25; the processing part 25 After the image data information is obtained, real-time correlation processing is performed on it, and a drive signal is issued according to...

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Abstract

The invention discloses an auto focusing method comprising following steps: driving the lens to move in the whole range can be reached with a predetermined step width, obtaining an image at the initial position of the lens and at the position of each step of the lens; comparing each obtained image, memorizing corresponding lens position, and calculating the fractal dimension value of each pixel in a certain area therein; calculating the image evaluation value by using the fractal dimension value, thereby obtaining an image evaluating sequence; finding out the maximum value, and the values corresponding to the front and post n (n is a positive integer) steps in the sequence, making a parabolic curve according to the 2n+1 evaluating values and the corresponding lens position values; and calculating the corresponding lens position of the parabola vertex which is the lens focusing position. The invented auto focusing method can analyze image detail information well with good adaptability, focusing accuracy is increased, focusing position can be found out quickly, and the invented method can be used broadly in diversified cameras.

Description

【Technical field】 [0001] The invention relates to an automatic focusing method of a camera device, in particular to an automatic focusing method for quickly determining the focusing position of a lens by using image processing means to obtain relevant information. 【Background technique】 [0002] Autofocus technology is one of the key technologies of various imaging systems. Only with accurate focus can the image be clear. The method of auto focus is to automatically adjust the position of the lens according to the distance between the lens and the subject during shooting so that the subject is imaged on the focal plane of the lens to obtain the clearest image. The autofocus method can be divided into two categories according to the control principle: one is active, the signal is sent by the camera device, and the subject is reflected to the receiving system of the camera device, and the lens is automatically moved to the appropriate position after processing, such as the inf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B7/28G03B13/36
Inventor 陆圣吕伟
Owner RUITAI OPTICAL CHANGZHOU CO LTD
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