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Dual camera based automatic focusing method

An auto-focus, dual-camera technology, used in image communication, color TV components, TV system components, etc., can solve the problems of not really improving the focusing speed, long focusing time, and complex algorithms, and achieve good real-time performance. , the calculation amount is small, the effect of improving the focusing speed

Inactive Publication Date: 2018-07-24
ZHEJIANG UNIV
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AI Technical Summary

Problems solved by technology

[0005] In terms of focusing strategy selection, the currently applied close-range priority focusing strategy is still based on the mountain-climbing focusing method, which requires analysis and comparison of multiple images. Improve focus speed

Method used

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  • Dual camera based automatic focusing method

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Embodiment Construction

[0028] Such as figure 1 As shown, the method of the present invention includes: using a semi-global stereo matching method to obtain the preliminary disparity of the left and right images, using a weighted median filter method to obtain the final disparity map, and adopting a focus strategy of large picture priority combined with close range priority to determine the target The parallax of the object is used to calculate the focus distance to guide the camera to adjust the focus using the depth information of the object.

[0029] The following is a detailed description with examples:

[0030] (1) As attached figure 2 As shown, 20 pairs of plane checkerboard pictures at different positions or different angles are taken with a binocular camera, and the stereo camera calibrator tool of MATLAB is used to calibrate, and the calibration results are filtered, and the picture pairs with error number greater than 1 are eliminated, and then Use the remaining pictures to calculate the intern...

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Abstract

The invention discloses a dual camera based automatic focusing method. The method includes the following steps: adopting a binocular camera that only has horizontal displacement to obtain a pair of binocular images at a default alignment plane, adopting a semi-global stereo matching method to solve the parallax of the binocular images, and partitioning the parallax to obtain a preliminary parallaxdiagram; correcting the parallax by using a weighted median filtering method, and removing a singular value in the parallax diagram to obtain a final parallax diagram; after a user selects a focusingarea, extracting a parallax value of the focusing area by using a focusing strategy in which a large screen priority mode and a close-range priority mode are combined, and calculating a focusing distance by using a trigonometric ranging method based on the parallax value and internal and external parameters of the binocular camera to achieve one-step focusing. The invention proposes the focusingstrategy in which the large screen priority mode and the close-range priority mode are combined for a single picture, the main body of the picture can be highlighted, and the one-step focusing can beachieved by using only a single pair of binocular images; and the method disclosed by the invention is small in calculation amount and good in real-time performance, and greatly improves the focusingspeed.

Description

Technical field [0001] The invention relates to a method for realizing one-step automatic focusing by using a single pair of binocular pictures on the basis of the dual camera technology of a mobile phone. Background technique [0002] With the popularization of smart phones, more and more people use mobile phones as their daily shooting tools, and people have higher requirements for the speed of taking photos with mobile phones. Current smart phones can be equipped with dual cameras. How to use dual cameras to achieve fast focus and improve photo efficiency is an important issue for autofocus technology. [0003] Traditional single-camera focusing methods mainly include lidar (time-of-flight method), phase method, mountain climbing method, and triangulation ranging method. Laser focusing technology uses a laser beam emitted by the mobile phone sensor, which is received by the sensor after reflection, and then calculates the exact distance to the target object by calculating the r...

Claims

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Application Information

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IPC IPC(8): H04N13/128H04N13/239H04N5/232
CPCH04N23/67
Inventor 李昊颖冯华君朱屹凝王婉欣
Owner ZHEJIANG UNIV
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