Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, China.
Beijing Key Laboratory on Nuclear Detection and Measurement Technology, Beijing, China.
J Xray Sci Technol. 2023;31(5):1093-1114. doi: 10.3233/XST-230088.
X-ray imaging plays an important role in security inspection. However, the objects are complex, which makes it difficult to automatically detect prohibited and restricted objects.
This study aims to develop and test a detection method based on a new image segmentation scheme to solve the problem of detecting prohibited and restricted objects from pseudo-color X-ray images with complex backgrounds.
The internal mechanism of the influence of different color spaces on image segmentation effect is explored, and the color space component Hi is studied. Furthermore, the mechanism of the new Hi component and the influence law of its adjustable coefficient are revealed. Additionally, a detection method based on Hi color space segmentation for pseudo-color X-ray images is proposed. The segmentation and detection methods are then tested on actual X-ray images.
The results show that hue has the greatest influence on image segmentation effect of the pseudo-color X-ray images. For different pseudo-color X-ray images with complex backgrounds, applying the proposed new Hi color space segmentation method achieves overall accuracy of 0.974 and 1.0 in detecting the gun and knife, respectively.
The new X-ray image detection method based on the Hi color space segmentation proposed in this paper enables to better solve the complex background problem including object overlap and adhesion and thus more effectively meet the requirements of actual security inspection.
X 射线成像在安全检查中发挥着重要作用。然而，由于物体复杂，自动检测违禁和受限物品具有一定难度。
本研究旨在开发和测试一种基于新图像分割方案的检测方法，以解决从具有复杂背景的伪彩色 X 射线图像中检测违禁和受限物品的问题。
探索不同颜色空间对图像分割效果影响的内在机制，研究 Hi 颜色空间分量。揭示新的 Hi 分量的机制和其可调系数的影响规律。此外，提出一种基于 Hi 颜色空间分割的伪彩色 X 射线图像检测方法。然后，在实际 X 射线图像上测试分割和检测方法。
结果表明，色调对伪彩色 X 射线图像的分割效果影响最大。对于具有复杂背景的不同伪彩色 X 射线图像，应用所提出的新 Hi 颜色空间分割方法，对枪支和刀具的检测总体准确率分别达到 0.974 和 1.0。
本文提出的基于 Hi 颜色空间分割的新 X 射线图像检测方法能够更好地解决包括物体重叠和粘连在内的复杂背景问题，从而更有效地满足实际安全检查的要求。
