基于粗糙集理论的胸部X线数字图象增强方法的研究

采用一种基于粗糙集理论实现胸部X线数字图象增强的新方法,该方法根据粗糙集的条件属性,将一幅采用双能量算法获得的肺部软组织X线数字图象划分为不同的子图象,然后对各个子图象分别作衬比增强从结果中可看出,采用种方法处理后得到的图象效果较为理想,能给临床上的医学工作者提供清晰的图象,同时也为后续的计算机辅助诊断提供有效的依据.     

基于DSP的长波红外偏振图像伪彩色系统研究

针对现有的红外偏振图像伪彩色技术只能对采集到的偏振图像进行标量的、非动态的显示,研究了基于P、S偏振态图像的红外伪彩色信号处理.将P、S偏振态图像信息经过处理后映射到RGB颜色空间,设计了以TMS320DM642芯片作为核心处理器的伪彩色处理系统硬件电路,完成了伪彩色信号处理系统的软件设计与调试分析.该红外偏振图像处理...     

一种新的全色图像与光谱图像融合方法研究

给出了一种新的综合伪彩色映射技术和小波变换理论的图像融合方法,并将其应用于全色图像和光谱图像的融合中.通过提取两个不同谱段光谱图像的共有信息和特别信息,并进行伪彩色映射融合,来增强目标与背景的对比度.同时将伪彩色映射融合后的图像进一步用IHS变换提取空间信息,在小波变换框架下将其与全色图像进行融合以提高目标的边缘细节信息,使所获得的融合结果不仅包含丰富的光谱信息的同时还具有较高的空间分辨率.仿真图和评价指标表明,该算法在增强目标与背景的对比度以及保留目标信息等方面具有较强的优势.     

图象密度分割仪中透过率和密度测量误差的分析

本文分析计算了图象密度分割仪中影响透过率和密度测量的各项误差因素,以及为了减少透过率和密度测量误差而采取的措施.图象密度分割仪是利用密度分割和伪彩色增强显示技术     

肺癌的血清自体荧光检测

激光诱导荧光光谱是一种研究较为广泛的医用光谱技术,已经被用于组织、细胞学的检测.本文利用激光诱导荧光光谱技术,测定了肺癌患者和健康人的血清自体荧光光谱.并采用主成分分析法和判别分析法对荧光光谱数据进行了分析和处理,从大量的光谱数据中提出少量主成分值,并通过主成分值的差别对肺癌的诊断率进行分析.得到的结果为,对肺癌的诊断...     

X射线荧光弱图象的去噪与增强

本文分析了X射线荧光弱图象的特点,以图象直方图分析为指南,采用多帧平均、灰度分段线性变换、邻域平均等空域处理方法,取得了去噪与增强的良好效果,并实现了快速处理。     

相位调制密度假彩色编码

本文提出一种利用光栅调制的位相图象在白光照射下取零级或一级等低衍射级次,获得彩色化输出图象的新方法。本方法光强利用率高、彩色饱和度好、噪声低、方法简便、易于推广,已在遥感、生物医学等图象处理中收到实际应用效果。彩色图象特征鲜明,易于识别。将黑白图象彩色化一直是图象处理中一个重要课题。在光学上已研究了实现图象彩色化的许多方法。但一般都利用衍射一级或其他高级次的输出图象。本文提出一种获得彩色化输出图象的新方法:用罗奇光栅对待处理的图象抽样,再作漂白处理,使图象上不同的密度信息转换成相应的位相信息,再利用位相图象在白光处理系统中的衍射特性,取出零级或一级等低衍射级次输出,从而获得光强利用率高、彩色饱和度好、噪声低的彩色输出图象.     

闪光辐射照相及光学高速摄影图象的增强处理

本文介绍图象增强处理技术在闪光辐射照相图象及光学高速摄影图象中的应用.针对闪光图象及高速摄影图象的特点,研究了一些有效的图象增强方法,取得了很好的应用效果. 文中给出了部分应用实例.     

用于显示乳房局部病灶组织红外热图像的伪彩色方法

通过检测人体体表每点的红外热辐射能量,可以得到反映体表温度分布的红外热图像。当乳房内部出现恶性肿瘤时,由于局部病灶组织具有异常的血运状态,会引起乳房表面病灶区域的温度显著升高。医生通过对乳房红外热图像病灶区域进行视觉分析、判断,可以实现对乳腺癌的检测。为了便于医生更好地发现这些病灶区域,本论文通过引入视觉因素,改进了传统的伪彩色显示方法,使病灶区域具有更鲜明的显示效果。这一方法的效果在47例乳腺癌病人的乳房红外热图像上得到了证实。采用这一方法对红外热图像病灶区域进行视觉分析所得到的结果,可以和采用近红外光谱等方法得到的组织血运状态进行对照比较,从而获得更为确切的诊断信息。     

视频图象分析处理系统应用研究

本文描述了一种基于视频图象的分析处理系统,结合工程应用实践,提出利用微机终端显示器作为象框坐标测量器,实现对视频图象的分析处理.不仅具有丰富的数字图象处理功能,还可对原始图象进行增强和细分等处理.     

Laser-Induced Fluorescence Bronchoscopy for Detection and Localization of Early Lung Cancer

Experimenatal results on the development of a Laser-Induced Fluorescence Bronchoscopy(LIFB) for the detection and localization of early lung cancer are reported in this paper. The system utilizes fluorescence of photosensitizer drug to provide real time video imaging for the examined lung tissue. Color filters are used to differentiate signal from background and a computer image processing technique is also applied to subtract the background. Moreover, a pseudocolor contrast enhancement method was developed to enhance the fluorescence image displayed on the vidio monitor. Suspicious areas are identified by pseudocolor image to guide biopsy, and several clinical trials show that sensitivity and contrast capability of the system should permit the detection and localization of early lung cancer.     

Laser-Induced Fluorescence Bronchoscopy for Detection and Localization of Early Lung Cancer

Experimenatal results on the development of a Laser-Induced Fluorescence Bronchoscopy(LIFB) for the detection and localization of early lung cancer are reported in this paper. The system utilizes fluorescence of photosensitizer drug to provide real time video imaging for the examined lung tissue. Color filters are used to differentiate signal from background and a computer image processing technique is also applied to subtract the background. Moreover, a pseudocolor contrast enhancement method was developed to enhance the fluorescence image displayed on the vidio monitor. Suspicious areas are identified by pseudocolor image to guide biopsy, and several clinical trials show that sensitivity and contrast capability of the system should permit the detection and localization of early lung cancer.     

Phase modulation pseudocolor encoding ghost imaging

We present a ghost imaging scheme that can obtain a good pseudocolor image of black-and-white objects.The essential idea is to use a multi-wavelength thermal light source and the phase modulation pseudocolor encoding technique,which overcomes the disadvantages of other methods involved spatial filtering.Therefore,the pseudocolor ghost image achieved by this imaging scheme is better than that obtained by other methods in terms of brightness,color,and signal-tonoise ratio.     

基于均匀颜色知觉空间的多光谱图像彩色合成

本文在分析现有多光谱图像彩色合成方法的基础上，提出了基于均匀颜色知觉空间的ＨＬＣ合成法，讨论了单谱段图像映射、分量图像合成、色域变换以及合成图像的色差预测和评估、彩色变换和逆变换，分析了影响合成图像视觉效果的因素。应用于伪装目标的识别获得了比ＲＧＢ、ＹＭＣ、ＩＨＳ等合成法更好的效果     

Anaglyph stereo visualization by the use of a single image and depth information

In this paper, an anaglyph stereo visualization is studied by the use of a single image and depth information. The present technique allows the stereo visualization of the target image without binocular camera, which has been used for generating the standard anaglyphs. Three test cases are shown in this work, which covers the generation of monochrome anaglyph from given geometrical information, and that of monochrome and color anaglyph from depth information evaluated from other imaging devises, which are placed in parallel. The experimental depth information of the target image is evaluated from the correlation-based template matching analysis of the random dot patterns optically projected on the target objects. Examples of anaglyph stereo visualization are shown for scientific art, such as the monochrome cube, monochrome plaster figure and the color artificial flowers. These results indicate that the present technique of anaglyph stereo visualization through the depth information is very useful and widely applicable to the general three-dimensional visualization.     

Derivation of the analytical solution of Color2Gray algorithm and its application to fast color removal based on color quantization

In order to convert a color image into a monochrome one, the lightness components of pixels have to date been used as gray-levels for the representation of the monochrome image. However, saliencies of an image embedded only in the chrominance components are eliminated in such conversion. To cope with this problem, “Color2Gray” algorithm, which excels in the color removal of digital images, has been proposed by Gooch et al. [ACM Trans. Graphics 24 (2005) 634]. In this paper, the algorithm is first analyzed and its mathematical property is revealed. Then a fast Color2Gray algorithm is proposed by using the mathematical property. Finally, the validity and the effectiveness of the proposed algorithm are proven by some experiments.     

具有图象处理功能的激光荧光内窥系统的研究

内窥镜荧光图象系统是体腔内早期肿瘤诊断和定位的有效手段.但是早期开发研究的LFE荧光成家系统由于存在假阳性和假阴性误诊而限制了它的广泛开展和应用.本文仔细探讨了该系统产生误诊的原因,并在此基础上提出了使用计算机图象处理技术的荧光图象系统,而且通过实验验证了这种新技术,它能有效地克服假阳性和假阴性误诊,为体腔内肿瘤的诊断提供可靠判据.     

Color removal method of considering distance in color space

In a color-to-gray conversion, which only considers lightness components, difference of colors are not appropriately reflected in monochrome images. Gooch et al. have proposed a color removal method that considers the differences of colors. Although the method can obtain good results in many cases, there is room for improvement. In this paper, a new color removal method that introduces a weight to Gooch’s algorithm is proposed. In the proposed method, for combinations of colors of each pixel in an input image, weights are determined by distance in color space. In the proposed method, unimportant color combinations are not considered by weight and color information in an input image is appropriately reflected in a monochrome image. The validity of the proposed method is shown by experiments using some images.     

All-silicon chiral metasurfaces and wavefront shaping assisted by interference

The usage of full-color imaging in digital pathology produces significant results. Compared with a grayscale image or a pseudocolor image containing contrast information, a full-color image can identify and detect the target object better with color texture information. Fourier ptychographic microscopy(FPM) is a high-throughput computational imaging technique that breaks the tradeoff between high resolution(HR) and a large field of view. It also eliminates the artifacts of scanning and stitching in digital pathology and improves its imaging efficiency. However, the conventional full-color digital pathology based on FPM is still time-consuming because of the repeated experiments with tri-wavelengths. A color transfer FPM approach termed "CFPM" was reported. The color texture information of a low-resolution full-color pathologic image is directly transferred to the HR grayscale FPM image captured by only a single wavelength. Both of the color space of FPM based on the standard CIE-XYZ color model and the display based on the standard RGB color space were established. Different FPM colorization schemes were analyzed and compared with 30 biological samples. Three types of evaluation approaches were provided, including the root-mean-square error(RMSE), the difference maps, and the image histogram cosine similarity. The average RMSE values of the conventional method and CFPM compared with the ground truth were 5.3% and 5.7%, respectively. Therefore, the reconstruction time is significantly reduced by 2/3 with the sacrifice of precision of only 0.4%. The CFPM method is also compatible with advanced fast FPM approaches to further reduce computation time.     

三波段微光彩色夜视方法研究

为克服夜视设备产生单色图像的缺陷,得到更符合人眼视觉的彩色夜视图像。根据RGB理论模型以及滤光片的分谱作用原理,基于第二代像增强器设计出一种彩色夜视方案,通过测量滤光片的光谱透过率,得出滤光片对像增强器信噪比的影响;提出利用全波图像的四帧融合解决像增强器信噪比低的问题,并进行实验验证。实验结果显示室内和室外情况下四帧融合彩色图像熵和方差分别达到6.8、35.39及7.0、45.07,均优于三帧融合时对应值,说明提出的四帧融合方法能够克服信噪比降低的缺陷,得到清晰且信息量丰富的夜视图像。