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Pupil control automatic focusing method for digital camera and system

A digital camera and auto focus technology, applied in the field of digital cameras, can solve problems such as inability to focus accurately

Inactive Publication Date: 2015-11-11
SHANGHAI WINGTECH ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the focus evaluation function is applied to the entire image, the unimportant part of the image (background) will have a negative impact on the evaluation results, causing the important part of the image (the main imaging target) to be out of focus
Even if the focus window is selected according to the method of central area selection / multi-area selection, this problem may exist

Method used

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  • Pupil control automatic focusing method for digital camera and system
  • Pupil control automatic focusing method for digital camera and system

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Embodiment 1

[0100] see Figure 4 , the invention discloses a pupil-controlled autofocus method for a digital camera, the method comprising:

[0101] [Step S1] Determine the focus area of ​​the person according to the pupil position;

[0102] Combining pupil tracking with the method of multi-region selection of focus windows, the scene is divided into 3×3=9 large regions;

[0103] For the pupil position, the corresponding attention concentration area can be determined only by judging the horizontal left, middle and right directions and the vertical upper, middle and lower directions;

[0104] The last selected focus window is the middle area of ​​M×N pixels in the corresponding attention area; 16≤M, N≤256 and M, N=2 k , K is an integer;

[0105] [Step S2] Acquiring an eye image;

[0106] A method of tracking pupils using the camera's own image sensor and optical elements; this method uses the optical path of the viewfinder to image the photographer's eyes;

[0107] The SLR camera adds a...

Embodiment 2

[0149] The invention discloses a pupil-controlled autofocus method for a digital camera, the method comprising:

[0150] Step 1. Determine the concentration area of ​​the person according to the pupil position.

[0151] Due to the complexity of the eye shape and movement, it is very complicated to determine the attention target of the person from the pupil position completely and accurately, which is unrealistic in the automatic focusing device. Therefore, in this paper, pupil tracking and multi-area selective focus are combined. Due to the complexity of eye shape and movement, it is very complicated to determine the human attention target completely and accurately from the pupil position, which is unrealistic in the automatic focus device. Therefore, this paper combines pupil tracking with the method of multi-region selection of focus windows, and divides the scene into 3×3=9 large regions ( figure 1 ), as long as the focus of attention is determined according to the pupil p...

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Abstract

The invention discloses a pupil control automatic focusing method for a digital camera and a system. The method comprises steps: S1, according to the pupil position, an attention concentration area of the person is determined; S2, an eye image is acquired; S3, the pupil position is determined; and S4, the pupil tracks and determines the attention area. According to the pupil control automatic focusing method for the digital camera and the system of the invention, automation and intelligence of focusing window selection can be realized.

Description

technical field [0001] The invention belongs to the technical field of digital cameras, and relates to an automatic focus system, in particular to a pupil control automatic focus system for a digital camera; meanwhile, the invention also relates to a pupil control automatic focus method for a digital camera. Background technique [0002] In real life, when taking pictures with a digital camera, the quality of the focus has a great impact on the quality of the picture. The direct reason for selecting the focus window is: because the calculation of the image using the focus evaluation function is basically proportional to the number of pixels in the image, in order to meet the real-time requirements, the number of pixels involved in the calculation must be reduced. In order to achieve this purpose, initially people usually directly select the central area of ​​the image as the focus window. However, according to the requirements of photography aesthetics, the main imaging tar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/232G03B13/36
Inventor 李保印
Owner SHANGHAI WINGTECH ELECTRONICS TECH
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