A method of blurring image background

Abstract

The invention discloses a method of image background blur. The method utilizes the approach of estimating the depth of the defocus to extract the focal area of the image, namely extracting the focused subject, and segments the focused subject and the background with the combination of super pixel division. Morphological binarization means is utilized to obtain the template of the focused subject area and the background area, the method blurs the background area, and the resulting image of the final background blur is obtained through overlaying the image of the focused subject area and the image of the background area. The method is capable of highlighting the effects of the focused subject area through blurring the background of the original image, and the whole process realizes to be automated and self-capable without human intervention.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a background blurring method for image special effects, beautification and rendering. Background technique [0002] With the rapid development of digital image and multimedia technology, there are more and more various types of optical imaging systems. People are increasingly using mobile devices such as mobile phones to take pictures and videos, and images with blurred background are gradually becoming more and more popular. It is favored by people, but due to the limitation of hardware conditions, various portable mobile devices cannot achieve the imaging effect of SLR cameras. The technique used in the background blur pictures taken in SLR cameras is to use the variability of the aperture, focal length and object distance in the lens to achieve the blur effect. The larger the aperture, the greater the focal length or the closer the object distance, the blurred the background. ...

AI Technical Summary

Problems solved by technology

Changing these conditions virtually increases the requirements for photography skills, and at the same time seriously affects the viewfinder range, limiting the operable space of the photographer.

[0003] For mobile phone cameras or other handheld camera devices, telephoto lenses cannot be used due to size limitations. To achieve the background blur effect, they can only shoot some close-up objects, which is difficult to achieve a practical level.

At present, some background blur software involves some matting techniques, or basically requires manual intervention to select the focus area, or directly uses saliency to extract the foreground target area. When the area we are concerned about is not the foreground area, it cannot achieve satisfactory effect

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