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Integrated automatic focusing camera device and definition evaluation method

A technology of sharpness evaluation and automatic focusing, which is applied in focusing devices, installations, cameras, etc. to ensure reliable evaluation, stable focusing, and real-time performance.

Inactive Publication Date: 2011-01-12
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] 5. Algorithm complexity, algorithm complexity must adapt to real-time requirements

Method used

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  • Integrated automatic focusing camera device and definition evaluation method
  • Integrated automatic focusing camera device and definition evaluation method
  • Integrated automatic focusing camera device and definition evaluation method

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Embodiment Construction

[0025] Such as figure 1 As shown, the integrated auto-focus camera device of the present invention includes a variable-magnification optical zoom lens unit, a CCD image sensor unit, a motor drive unit, a camera signal processing unit, a DSP image processing unit, and a communication unit, wherein the variable-magnification The optical zoom lens unit, the CCD image sensor unit, the camera signal processing unit, the DSP image processing unit, the motor drive unit are connected in series, the motor drive unit is connected with the variable magnification optical zoom lens unit, the camera signal processing unit and the DSP image processing unit respectively connected to the communication unit. The communication unit is responsible for communicating with the host computer.

[0026] The variable magnification optical zoom lens unit, CCD image sensor unit and motor drive unit form the imaging part, among which the variable magnification optical zoom lens unit and motor drive unit c...

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Abstract

The invention discloses an integrated automatic focusing camera device and a definition evaluation method. The reliable evaluation of the focusing definition is guaranteed by taking the high-frequency component of an image signal as a feature estimation value of the focusing definition and by adopting a spatial domain and frequency domain combined algorithm method. The automatic focusing device realizes the calculation of the definition evaluation value and the control over the back and forth movement of an optical focusing lens by controlling a stepper motor, makes an image formed at a most definite focusing position by adopting a spatial domain and frequency domain multi-feature climbing search strategy and ensures quick focusing by adopting a digital signal processor for acceleration. By combining a communication interface and a control protocol, an integrated camera device is realized.

Description

technical field [0001] The invention relates to an integrated electronic camera and an automatic focusing technology applied to the electronic camera, in particular to an integrated automatic focusing camera device and a definition evaluation method. Background technique [0002] The traditional auto-focus technology is divided into two types: active and passive. Active auto-focus uses infrared or ultrasonic waves to measure the distance between the camera and the object, thereby adjusting the focal length position; The focus position is adjusted by electronic detection. [0003] With the development of digital image processing technology, more and more autofocus devices rely on image processing algorithms instead of active ranging methods. Image processing theory believes that the focusing system of the lens is equivalent to a low-pass filter, and the cutoff frequency of the filter is determined by the current image distance and the focal length of the lens. Therefore, th...

Claims

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Application Information

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IPC IPC(8): G03B13/36G02B7/36H04N5/232
Inventor 贾晨阳刘云海
Owner ZHEJIANG UNIV
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