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

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: 2021-02-05
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, device, equipment and storage medium in fisheye image stitching
  • Brightness compensation method, device, equipment and storage medium in fisheye image stitching
  • Brightness compensation method, device, equipment and storage medium in fisheye image stitching

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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, and k is an independent variable.

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

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 on the memory and operable on the processor. When the processor executes the program, the fisheye image mosaic provided in Embodiment 1 is realized. 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, device, equipment and storage medium in fisheye picture stitching. It relates to the technical field of image processing, and the technical solution of the present invention mainly includes: expanding a fisheye picture obtained by using a fisheye lens to obtain an expanded fisheye image. Obtain the distance between the fisheye expansion map and the uniform distribution, and select the fisheye expansion map with the smallest distance from the uniform distribution as the reference image. Histogram matching is performed on the fisheye expanded image using the reference image. The problem solved by the present invention is the brightness compensation problem in video / picture splicing based on fisheye lens.

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 fisheye-based panoramic cameras have appeared on the market, such...

Claims

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Application Information

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