Method of Removing Periodic Noise in Light Field Reconstructed Image Based on Frequency Domain

A technology of light field reconstruction and periodic noise, applied in image enhancement, image analysis, image data processing, etc., can solve problems such as loss of details and blurred images, and achieve the goal of removing stitching edge noise, avoiding image blurring, and protecting image details. Effect

CN110866874BActive Publication Date: 2021-07-30NANJING UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-07-30

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Abstract

The invention discloses a method for removing periodic noise in a light field reconstruction image based on frequency domain. The specific steps are: S1 collects the light field imaging image of the sample; S2 collects the sample-free optical center position map; S3 calibrates the imaging center of each microlens and renders and reconstructs the light field imaging image; S4 transforms the light field reconstruction image into the frequency domain , to generate the image spectrum; S5 preprocesses the image spectrum; S6 generates a low-pass filter; S7 multiplies the low-pass filter with the preprocessed image spectrum, and sets the spectral value of the low-frequency component to zero; S8 reconstructs the image for the light field The spectrum is binarized to obtain an image mask; S9 filters out the high-frequency periodic noise component in the original spectrum of the light field reconstruction image; S10 converts the filtered light field reconstruction image spectrum back to the space domain, and obtains the light field with periodic noise removed. Field reconstruction image. The invention can effectively remove periodic noise in the light field reconstruction image, eliminate splicing edge traces, and optimize the reconstruction result.
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Description

technical field

[0001] The invention belongs to the field of light field imaging, and in particular relates to a method for removing periodic noise in a light field reconstruction image based on a frequency domain. Background technique

[0002] The emergence of light field cameras provides people with a new thinking about the mechanism of image capture. When shooting with traditional cameras, the focus position must be selected first. Once the image is captured, the focus position cannot be changed. However, in some high-speed photography scenarios, such as sports, animal photography, etc., it is of great significance to be able to achieve "shoot first and then focus".

[0003] Light field cameras are implemented by adding a microlens array between the main lens and the sensor inside a conventional camera. Under the action of the microlens array, the light field camera can simultaneously capture the spatial and angular information of the light in a single exposure, that is...

Examples

Embodiment Construction

[0033] In order to make the object, technical solution and advantages of the present invention clearer, the implementation method of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0034] see figure 1 , the method of the present invention based on the frequency domain to remove periodic noise in the light field reconstruction image, the steps are as follows: S1: Place the sample in front of the light field imaging system, illuminate the sample with a light source, adjust the imaging plane of the system to the plane where the sample is clearly imaged, and collect Light field image of the sample.

[0035] The principle of the light field imaging system of the present invention is based on a type II light field camera. The light field imaging system includes a main lens, a microlens array and a sensor. The specific imaging process is that the sample A is imaged in front of the microlens array through the main lens,...