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DFF-based auto-focusing method

A technology of automatic focusing and focusing position, applied in focusing devices, components of color TVs, components of TV systems, etc., it can solve the problems of inability to focus, repeated focusing, and focusing too long, so as to avoid repeated focusing and achieve clear images. Effect

Inactive Publication Date: 2014-12-17
武汉众智数字技术有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0005] The traditional passive autofocus algorithm has a strong dependence on the evaluation value of image clarity. The main difficulty is that when the light of the shooting environment is dark or the distance between the object and the background is very different, the focusing time will be too long or Unable to focus, prone to repeated focus and other problems

Method used

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Embodiment Construction

[0037] Below in conjunction with accompanying drawing and embodiment describe in detail:

[0038] 1. System

[0039] 1. Overall

[0040] Such as figure 1 , the system includes common functional blocks: lens 101, image sensor 102, exposure and white balance preprocessing module 103, embedded microprocessor 105, focus mode detection circuit 108 and shared memory 109;

[0041] It is provided with: a lens motor control module 104, a DFF algorithm module 106 and an image definition evaluation module 107;

[0042] Its connection relationship is:

[0043] Lens 101, image sensor 102, image preprocessing module 103, image definition evaluation module 107, DFF algorithm module 106 and embedded microprocessor 105 are connected in sequence to realize the acquisition function of digital images;

[0044] The focus mode detection circuit 108, the embedded microprocessor 105, the lens motor control module 104 and the lens 101 are sequentially connected to realize the control of the focal ...

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Abstract

The invention discloses a DFF (Depth From Focusing)-based auto-focusing method and relates to a focusing method for a digital imaging system. The digital imaging system adopts the structure that a lens, an image sensor, an image pre-processing module, an image definition evaluation module, a DFF algorithm module and an embedded microprocessor are sequentially connected to achieve a digital image acquisition function; a focusing mode detection circuit, the embedded microprocessor, a lens motor control module and the lens are sequentially connected to achieve control of the focal length of the lens; the embedded microprocessor is connected with the image sensor to achieve control of the image sensor; and the embedded microprocessor, the DFF algorithm module and the image definition evaluation module are respectively connected with a sharing internal memory to achieve data exchange among all the modules. The DFF-based auto-focusing method can achieve automatic fast focusing to obtain definite images, adapts to different scenes and is suitable for an all-in-one camera and a security monitoring and digital imaging system.

Description

technical field [0001] The present invention relates to a focusing method of a digital imaging system, in particular to an automatic focusing method based on DFF (depth from focusing, focusing depth). Background technique [0002] Autofocus is one of the core issues of digital imaging systems. The principle is to analyze and count the digital image data obtained from CCD (ChargeCoupledDevice, charge-coupled device) or CMOS (ComplementaryMetal-Oxide-SemiconductorTransistor, Complementary Metal Oxide Semiconductor) digital image sensor, and evaluate the image clarity of the current focus position , according to the feature that the image at the correct focus position is the clearest, use an adaptive search algorithm and a precise motor-driven lens to find the clearest focus position. [0003] When the positions of the lens and the image sensor are determined, only the scene with a certain distance from the lens can have a clear image on the image sensor. Conversely, in order...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B13/36G02B7/36H04N5/232
Inventor 罗巍刘尚军
Owner 武汉众智数字技术有限公司
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