IMAGING SCIENCE AND PHOTOCHEMISTRY

2019, 37(1): 0-0.

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The Novel Application of Optical Coherence Tomography in Forensic Investigation

ZHANG Ning, ZHONG Yizhi, LI Zhigang, GUO Jingjing, XU Lei, XIE Lanchi, YAN Yuwen, HOU Xinyu, HUANG Wei, LI Zhihui, XU Xiaojing, XIE Bin

2019, 37(1): 1-6. DOI: 10.7517/issn.1674-0475.181201

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Optical imaging technology is important for the detection and examination of physical evidence, and has the advantages of non-destructive, in situ and rapid analysis. In recent years, with the continuous development of optical imaging technology, some new techniques and methods have been introduced into the forensic science and put into application. Optical coherence tomography (OCT) is new in forensics and performs high-resolution, cross-sectional tomographic imaging of the internal microstructure in materials and tissues, and without any damages to the evidence. This paper first introduces a custom-built three-dimensional OCT imaging system, and then presents three novel applications by utilizing this system, including car paint analysis, latent fingerprint visualizing and hair follicle analysis. These results show that OCT technology is very suitable for physical evidence examination because of its characteristics of non-destructive high-resolution subsurface imaging. As a novel technology for forensic investigation, OCT imaging obtains internal structural information and new optical features of samples and extracts. In the future, it is expected to be portable and miniaturized and be applied in crime scene investigation.

Recent Advances in Molecular Imaging of Atherosclerotic Plaque

MU Yalin, CHEN Xiaomei, LIU Xuan, LIU Gang

2019, 37(1): 7-17. DOI: 10.7517/issn.1674-0475.181102

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Atherosclerosis-related cardiovascular diseases (e.g., acute myocardial infarction and stroke) are the leading causes of morbidity and mortality in the world today. The rupture of atherosclerotic plaques is the main pathological basis of acute cardiovascular disease events with no obvious clinical symptoms in the early stage of atherosclerosis. How to accurately identify vulnerable plaques and effective treatments in patients before acute cardiovascular and cerebrovascular events has become an urgent problem to solve, it is also the key to reduce the incidence of acute cardiovascular events. The rapid development of non-invasive molecular imaging technology in recent years has brought new opportunities for the diagnosis and treatment of atherosclerotic plaque.

Color Image Segmentation Algorithm Based on Lab Sub Channel Histogram and Its Application

YU Yiming, JIN Dian, WANG Qi, ZHANG Qi, CHEN Xi, WANG Xiaoju

2019, 37(1): 18-32. DOI: 10.7517/issn.1674-0475.181004

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In view of the color and texture features of the image are not taken into account in the traditional gray scale histogram segmentation algorithm, this paper proposed a new color image segmentation algorithm based on Lab sub channel histogram to solve the problems such as over segmentation or under segmentation for no obvious gray value difference images or grayscale overlapped images. The algorithm introduces three segmentation bases with sequence irrelevance:luminance "L" channel, red-green "a" channel and blue-yellow "b" channel, and then use the Newton interpolation method to fit operation. Users can choose the channel freely for different brightness and chromaticity attribute images. The paper also uses the matching principle of adjacent area gray value to solve the exact matching problem of pixels in the adjacent target area. The algorithm realizes the extraction of different objects in the image by sub office, sub morphology and subarea. In the light of images with significant difference in regional luminance characteristics or regional color difference greater than regional brightness difference, the segmentation results of the algorithm in this paper are better than the traditional gray scale histogram segmentation algorithm through a series of experimental verification, it greatly improves the applicability of histogram segmentation algorithm. Then we combine the new algorithm with the classic Reinhard color transfer algorithm, use the sub channel segmentation algorithm to obtain the target regions of interest from the source image and then transfer them separately. It solves problems of the interference to non-target area of image, color miscommunication and serious level loss of classical Reinhard color transfer algorithm. It breaks through the limitation that the traditional transfer algorithm can only coloring the whole region, and realizes accurate coloring in the subarea.

Preparation of Conductive Circuits Based on the Volume Additive in-situ

WU Qian, ZHU Xiaoqun, NIE Jun

2019, 37(1): 33-45. DOI: 10.7517/issn.1674-0475.180902

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This research provide a method for preparing conductive circuits. Nano copper powders were used as conductive filler and photo-curable resin were used as linking agent to prepare copper-containing photo-curing ink. The copper nano particles were patterned by screen printing method. Then, the copper nano particle patterns were converted to silver pattern by in-situ volume addition. The results showed that the printed copper patterns were not conductive, the silver patterns generated by the in-situ replacement reaction were conductive. The copper content, silver salt concentration, irradiation times, reaction times had a relationship with the conductive ability. In this experiment, We have got circuits whose conductivity is 1.25×10⁵ S/m.The conductive circuits have good bending character, good fatigue performance and repairable performance at the same time. This research provide a simple and cheep method for preparation of conductive circuits in room temperature.

Synthesis, Properties and Application of Fluorescence Carbon Quantum Dots in Bioimaging

LI Yali, GUO Jing, SONG Juan, PIAO Xiangmin, XU Xiaolong, WANG Yingping

2019, 37(1): 46-56. DOI: 10.7517/issn.1674-0475.181104

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The carbon dot (CD)-based fluorescent probe is a new type of fluorescent probe have been developed in recent years. Comparing with the traditional biological labels such as traditional organic dyes, fluorescent chromatin and usual fluorescent nanomaterial, the CDs have unique advantages (good water solubility, chemical inertia, low toxicity, easy function, anti-light bleaching, tunable and biocompatibility) have attracted considerable attentions. At present, more than ten kinds of inexpensive and convenient methods such as hydrothermal methods have been developed for large-scale preparation of fluorescent CDs. It has been widely used in cell function research, detection of cell surface and functional molecules, imaging of tissues, and positioning of pathogens. The synthesis method in recent years, the luminescence properties depending on the size and wavelength, and the application of fluorescent CDs in bioimaging are briefly reviewed, and their application in the pathology of medicinal plants is forecasted. It is expected to provide some reference for expending the application range of fluorescent CDs in the field of bioimaging.

Effects of Acetic Acid Syndrome on Film Images

QI Yunpeng, ZHAO Xili, ZHOU Yajun, LI Yuhu, XING Huiping, WANG Yong, WU Nan

2019, 37(1): 57-64. DOI: 10.7517/issn.1674-0475.181003

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Acetic acid syndrome is a special disease phenomenon of cellulose acetate film,and is the main factor threatening the safety of cellulose acetate film. Acetic acid syndrome caused the change of size, brittleness of the film base, severe damage of the image. In this paper, the Keyence VK-X250K shape measurement laser microscope was used to study the surface roughness of the base of syndrome acetate film, and the X-Rite Model VS450 spectrophotometer was applied to study the reflectivity of the film surface to the visible light. The experimental results show that the surface roughness and reflection to visible light increase when the acetic acid syndrome occurs. Thus, it can be explained that when the acetic acid syndrome occurs, the rough interface is formed due to precipitation of the plasticizer, which leads to the enhancement of the reflection to visible light. The attenuation of transmission light is the main factor leading to the damage of the recording image.

The History and Progress of Static Stereo Image Acquisition

XIE Junguo, GU Jinchang, ZHAO Hui

2019, 37(1): 65-70. DOI: 10.7517/issn.1674-0475.181102

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The development process of static stereoscopic images acquisition from stereo camera shooting reveals the evolution process of stereoscopic photography from silver salt technology to digital technology, from auxiliary stereo display to autostereoscopic display. With the progress of image information processing technology, the planar image transmutation to multi-view stereo image by using the depth transform principle of a single image and the interpolated frame technology using the two-view stereo image to generate an intermediate virtual viewpoint are also widely used. This paper analyzes the advantages and disadvantages of obtaining multi-view static stereo images by camera shooting and virtual viewpoints generated by the frame interpolation technology. In the application field of high quality and high resolution autostereoscopic display, camera shooting has more advantages in obtaining static stereo images. In order to reduce the cost of shooting system, the planar image transmutation to stereo image and virtual viewpoint generation technology have advantages. A camera array shooting system device which can adjust the spacing rapidly is described at last.

Analysis of Multilayer Flexographic Plate Technology

HUANG Yongshan, XU Wenran, WANG Xiaoyang, SHAO Guo'an

2019, 37(1): 71-76. DOI: 10.7517/issn.1674-0475.181105

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This paper introduces the multilayer flexographic plate technology of different companies in detail, and gives a brief description of the application. We systematically analyzes the patent of multilayer flexographic plate technology of major companies, and gives the breakthrough point of developing multilayer flexographic plate technology in China, and finally prospects the market application.

Study on Chroma Contrast Sensitivity Function of the Elderly and Application of Filtering

ZHANG Lei, LIU Zhen, WANG Qi, WANG Qian, KONG Lingjun

2019, 37(1): 77-86. DOI: 10.7517/issn.1674-0475.180602

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In order to study the color visual frequency response characteristics of the elderly, the functional relationship between chroma contrast sensitivity and spatial frequency was obtained. In this paper, based on LCH uniform color space, fixed brightness and hue angle values, using chroma as a variable, the chroma contrast sensitivity experiment was designed, and a large number of human visual observation experiments were conducted. The relationship between chroma contrast sensitivity and spatial frequency was obtained, and an exponential contrast sensitivity function model was constructed. The analysis showed that contrast sensitivity of the elderly increases first and then slowly decreases with the increase of spatial frequency, and there was a difference in chroma contrast between each hue angle. The difference in contrast sensitivity had a great correlation with the color discrimination characteristics of human eyes; building a specific sensitivity function model can be used to implement filtering processing based on the human visual system.

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