Method and apparatus for estimating depth by using focus stack based on density of feature points

A technology of feature points and focus piles, applied in computing, image data processing, instruments, etc., can solve the problem of low accuracy and achieve the effect of avoiding inaccuracy

Active Publication Date: 2017-06-20
BEIJING INFORMATION SCI & TECH UNIV
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However, the accuracy of the focus measurement method in the p

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  • Method and apparatus for estimating depth by using focus stack based on density of feature points
  • Method and apparatus for estimating depth by using focus stack based on density of feature points

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[0040] In the drawings, the same or similar reference signs are used to indicate the same or similar elements or elements with the same or similar functions. The embodiments of the present invention will be described in detail below in conjunction with the drawings.

[0041] In the description of the present invention, the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", " The orientation or positional relationship indicated by "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the pointed device or element It must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the protection scope of the present invention.

[0042] Such as figure 1 As sho...

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Abstract

The present invention discloses a method and apparatus for estimating depth by using a focus stack based on the density of feature points. The method includes the following steps that: the feature points of each image in a focus stack are extracted, a feature point density-based focus measure is established; a depth estimation model based on a feature point density-introduced weighted focus measure is established; and with an SML focus measure adopted as an instance, an SML and feature point density-based weighted linear mixed focus measure is adopted as the objective function of depth estimation, so that the estimation of the depth and full-focus image of a scene can be realized. According to the method of the invention, the focus measure about the density of the feature points and the linear weighted focus measure are established, and the focus measure-based depth estimation model is constructed, and the depth information of the scene is obtained, and therefore, the full-focus and three-dimensional reconstruction of the scene can be realized. With the method adopted, precise depth information can be provided for the realization of three-dimensional reconstruction, and the full-focus image can be obtained.

Description

technical field [0001] The invention relates to the fields of computer vision and digital image processing, in particular to a method and device for estimating depth from a focus stack based on feature point density. Background technique [0002] The digitization of 3D scene information has expanded human cognition and expression of 3D space. Image-based 3D reconstruction has always been a research hotspot in computational vision. Scene depth information reconstruction can provide 3D information for virtual reality, augmented reality, and photogrammetry, and is the key to reconstructing 3D scenes. [0003] At present, image-based scene depth estimation methods are mainly divided into stereo vision methods and monocular vision methods. For the stereo vision method, the parallax method is more common in the depth estimation method. The parallax method uses the parallax generated between images from different viewpoints as the basis for depth estimation. The core problem of th...

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Application Information

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IPC IPC(8): G06T7/55
Inventor 邱钧何建梅刘畅
Owner BEIJING INFORMATION SCI & TECH UNIV
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