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Quality evaluation method of light source scene-containing automatic focusing image

A technology of automatic focus and quality evaluation, applied in image enhancement, image analysis, image data processing, etc., to achieve good unbiased effect

Inactive Publication Date: 2016-01-13
ZHEJIANG UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to propose a method for evaluating the quality of auto-focus images of scenes containing light sources in view of the existing problems in night scene auto-focus

Method used

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  • Quality evaluation method of light source scene-containing automatic focusing image
  • Quality evaluation method of light source scene-containing automatic focusing image
  • Quality evaluation method of light source scene-containing automatic focusing image

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Embodiment Construction

[0030] The present invention is an auto-focus evaluation function for an area containing saturated pixels. The function adopts a method of using a saturated pixel template to act on the gradient value matrix, and removes the influence of saturated pixels on the auto-focus evaluation function, and has good unbiasedness and single peak. performance, sensitivity, and stability.

[0031] Describe in detail below in conjunction with accompanying drawing and example:

[0032] figure 1 It is a simple flow chart of the method of the present invention. In this embodiment, a group of real-shot images with a step count of 42 is taken as an example. figure 2 It is a schematic diagram of the defocus sequence of randomly selecting 5 real-shot images and the focus window area selected in the present embodiment among the 42 images, wherein (a)-(e) are the motors in the first step, the eleventh step, and the first step respectively. The pictures acquired at the positions of step 21, step 3...

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Abstract

The invention discloses a quality evaluation method of a light source scene-containing automatic focusing image. According to the method, a saturated pixel template is adopted to act on a gradient value matrix, and therefore, influences of saturated pixels on an automatic focusing evaluation function can be eliminated, and a saturated pixel-removed evaluation function can be obtained; as for a light source in a night scene and an excessively bright scene, the saturated pixel-removed evaluation function has excellent unbiasedness, unimodality, sensitivity and stability.

Description

technical field [0001] The invention relates to a method for evaluating the quality of an automatic focus image of a scene containing a light source. Background technique [0002] With the rapid development of digital image and multimedia technology, more and more people pay attention to the automatic focus method based on image processing. The image processing method mainly includes the following three aspects, which are: the selection of the focus window, the selection of the focus evaluation function, and the selection of the focus search strategy. This autofocus method is to use a certain digital image processing algorithm to obtain the characteristic value of image clarity, and control the motor according to this characteristic value to drive the lens or image sensor to change the position and make corresponding adjustments until the characteristic value is satisfied. to a pre-agreed condition. The key issue in this process is how to choose an appropriate focus evalua...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T7/40
CPCG06T7/0002G06T2207/30168
Inventor 王烨茹冯华君徐之海李奇陈跃庭
Owner ZHEJIANG UNIV
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