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Brightness compensation method and device in fisheye picture stitching, equipment and storage medium

A technology of brightness compensation and fisheye, which is applied in the field of image processing, can solve problems such as computational redundancy, and achieve the effects of low computational complexity, good brightness compensation, and reduced computational load

Active Publication Date: 2018-01-19
BEIJING BYTEDANCE NETWORK TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current brightness compensation technology often assumes that the picture is based on a normal lens without great distortion, so it is not suitable for fisheye pictures. At the same time, equidistant cylindrical projection, which is often used in panoramic pictures, also performs different degrees of adjustment on the picture. Stretching brings a certain amount of computational redundancy

Method used

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  • Brightness compensation method and device in fisheye picture stitching, equipment and storage medium
  • Brightness compensation method and device in fisheye picture stitching, equipment and storage medium
  • Brightness compensation method and device in fisheye picture stitching, equipment and storage medium

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Embodiment 1

[0046] An embodiment of the present invention provides a method for brightness compensation in fisheye image stitching, the method comprising the following steps:

[0047] S101. Expand a fisheye image obtained by using a fisheye lens to obtain a fisheye expanded image.

[0048] S102. Obtain the distance between the fisheye expanded image and the uniform distribution, and select the fisheye expanded image with the smallest distance from the uniform distribution as a reference image. The selection criterion of the reference pictures avoids selecting too dark or too bright pictures, so the selected reference pictures in this embodiment change dynamically according to the lighting conditions of the environment.

[0049] The uniform distribution is a discrete uniform distribution in probability theory, which is defined as:

[0050]

[0051] U(k) is a discrete uniform distribution, k is an independent variable

[0052] S103, using the reference image to perform histogram matchi...

Embodiment 2

[0064] figure 2 It shows a brightness compensation device in fisheye image mosaic provided by an embodiment of the present invention, including a fisheye image preprocessing module 201 , a reference image selection module 202 and a histogram matching module 203 .

[0065] The fisheye picture preprocessing module 201 is configured to expand the fisheye picture obtained by using the fisheye lens to obtain a fisheye expansion diagram, and send the fisheye expansion diagram to the reference image selection module 202 .

[0066] The reference image selection module 202 is configured to obtain the distance between the fisheye expansion diagram and the uniform distribution, select the fisheye expansion diagram with the smallest distance from the uniform distribution as a reference image, and send the reference image into the histogram matching module 203.

[0067] The histogram matching module 203 is configured to perform histogram matching on the fisheye expanded image by using th...

Embodiment 3

[0079] The embodiment of the present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and operable on the processor. When the processor executes the program, the fisheye image stitching provided in Embodiment 1 is used. Brightness compensation method in . The brightness compensation method adopts the method of calculating the distance between the picture and the uniform distribution to select the reference image, and can realize brightness compensation with a relatively low computational complexity.

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Abstract

The invention discloses a brightness compensation method and device in fisheye picture stitching, equipment and a storage medium, and relates to the technical field of image processing. The method mainly comprises the following steps of: expanding fisheye pictures obtained by adoption of a fisheye lens to obtain fisheye expanded pictures; obtaining distances from the fisheye expanded pictures to uniform distribution, and selecting a fisheye expanded picture, the distance from which to the uniform distribution is minimum, as a reference image; and carrying out histogram matching on the fisheyeexpanded picture by adoption of the reference image. According to the method, the brightness compensation problem in fisheye lens-based video / picture stitching is solved.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a brightness compensation method, device, equipment and storage medium in fisheye image mosaic. Background technique [0002] Panoramic video has developed rapidly in recent years because of its 360-degree viewing angle and immersive experience, and has become one of the development directions of video. Major video websites at home and abroad, such as Youtube, Youku, iQiyi, etc., have gradually supported the viewing of panoramic videos. Some large-scale sports and entertainment events, such as the NBA and Singing China, have also used "VR live broadcast". It is foreseeable that in the near future, more and more panoramic videos will enter our lives. [0003] Since the wide viewing angle of the fisheye camera can greatly reduce the number of lenses required for panoramic video stitching, a large number of panoramic cameras based on fisheye lenses have appeared on the ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T3/00G06T3/40G06T5/00G06T5/50
Inventor 王悦
Owner BEIJING BYTEDANCE NETWORK TECH CO LTD