A X-ray Light Field Imaging and Calibration Method Based on Pinhole Array

Abstract

The invention discloses an X-ray light field imaging and calibrating method based on a pinhole array. The X-ray light field imaging and calibrating method based on the pinhole array comprises the steps that (1) An X-ray light field imaging model based on the pinhole array is established and comprises an X-ray light source array, the pinhole array and an X-ray image sensor; (2) a linear exposure mapping image is established so that exposure of images of an X-ray light field can be normalized; (3) the pinhole center of each X-ray light field image is calibrated so that the central position of each pinhole image is extracted; (4) according to the center, obtained in the step (3), of each pinhole image, each X-ray light source image is extracted; (5) according to each X-ray light source image extracted in the step (4), the pixels at the same position in the pinhole images are extracted and reorganized into a frame of X-ray light source image; (6) the extracted X-ray light source images are converted into X-ray light source images which are orthogonally arranged. According to the X-ray light field imaging and calibrating method based on the pinhole array, the light field imaging principle of visible light is applied to X-ray imaging, and the requirement for the imaging quality of the X-ray images during clinical diagnosis and treatment is met.

Description

technical field [0001] The invention relates to light field imaging technology in the field of X-ray medical imaging, in particular to an X-ray light field imaging and calibration method based on a pinhole array. Background technique [0002] Light field imaging is based on traditional imaging equipment, through camera arrays, coded apertures or microlens arrays to achieve light field acquisition. In terms of light field imaging based on camera arrays, M. Levoy of Stanford University built a 4D light field acquisition platform consisting of 128 cameras in 1996. [1] . In 2000, P.Debevec of the University of Southern California realized the 4D static variable light acquisition system for face acquisition for the first time. [2] , Professor Dai Qionghai of Tsinghua University in China built the first domestic variable light dynamic light field acquisition system with a diameter of 6 meters, including 40 cameras and 310 LED light sources [3] . In 2012, the project team and T...

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Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention extends the light field imaging theory of visible light to X-ray imaging to solve the problem that the depth information of X-ray images is lost in clinical diagnosis and treatment, resulting in overlapping and indistinguishable images of different depths, and proposes a X-ray light field imaging and calibration method based on pinhole array without loss of depth information, no image overlap, low dose, fast imaging, and meeting the imaging quality requirements of X-ray images in clinical diagnosis and treatment

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