Refraction and reflection omnidirectional image restoration method with mirror surface parameter constraining blurring kernels

An omnidirectional image and parameter constraint technology, applied in image enhancement, image data processing, instruments, etc., can solve problems such as limiting image restoration effect, and achieve the effect of improving the effect

Active Publication Date: 2014-09-24
NAT UNIV OF DEFENSE TECH
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  • Abstract
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Problems solved by technology

Therefore, it is difficult for traditional image restoration techniques to accurately analyze and describe the defocus blur of omnidirectional images, which leads to the deviation of blur kernel estimation, thus limiting the effect of image restoration

Method used

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  • Refraction and reflection omnidirectional image restoration method with mirror surface parameter constraining blurring kernels
  • Refraction and reflection omnidirectional image restoration method with mirror surface parameter constraining blurring kernels
  • Refraction and reflection omnidirectional image restoration method with mirror surface parameter constraining blurring kernels

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Embodiment Construction

[0046] Such as Figure 5 As shown, this embodiment passes as Figure 6 The catadioptric imaging system shown acquires image data. In the imaging system, the camera is Canon5D Mark II, the lens is a 50mm F / 1.8 Canon lens, the aperture is set to F / 1.8, and an omnidirectional image of 7.5 million pixels is collected. The focus is set on the front of the catadioptric mirror, which is double Curved surface, the parameters are a=22.3mm, b=22.3mm, c=31.5mm. The collected defocused and blurred omnidirectional images are as follows: Figure 7 shown.

[0047] Such as image 3 As shown, the ring and block operations are performed on the collected omnidirectional image. For the ring division operation, the specific process is: the origin of the image is the center, and the radius is r k to radius r k The region of +Δr is the kth ring, and each ring is of equal width. where r k Indicates the radius of the inner ring of the kth ring, Δr represents the width of the ring, and k repre...

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Abstract

The invention discloses a refraction and reflection omnidirectional image restoration method with mirror surface parameter constraining blurring kernels. Under the framework of the maximum posterior probability image restoration theory, according to the characteristics of a refraction and reflection imaging system, blurring kernel constraints, namely the rotating symmetry constraint and the spatial transformation constraint, for a refraction and reflection imaging model are provided. According to the refraction and reflection omnidirectional image restoration method, the good omnidirectional image restoration effect is obtained through new blurring kernel constraint terms.

Description

technical field [0001] The invention relates to the field of digital image processing, in particular to a catadioptric omnidirectional image restoration method. Background technique [0002] Due to the miniaturization and integration of catadioptric imaging, there are more and more panoramic applications based on catadioptric omnidirectional imaging. Typical applications involve lunar exploration, intelligent panoramic video surveillance, mobile robot visual navigation, remote video conferencing, Virtual scene roaming, etc., such as figure 1 shown. However, with the deepening of applications, basic problems such as low spatial resolution, uneven resolution, and imaging blur inherent in catadioptric omnidirectional imaging have become more and more prominent, especially defocus blur problems, such as figure 2 shown. [0003] At present, the method of maximum a posteriori image restoration is the most widely used method in the field of image restoration. This method is ba...

Claims

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Application Information

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IPC IPC(8): G06T5/00
Inventor 刘煜张茂军谭树人张政彭阳
Owner NAT UNIV OF DEFENSE TECH
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