一种颜色保持的彩色图像增强新算法

New hue preserving algorithm for color image enhancement

赵全友[1,2] 潘保昌[1,2] 郑胜林[1,2] 战荫伟[1,2]

分析了Retinex理论及其典型彩色图像增强算法，在此基础上提出一种颜色保持的彩色图像增强新算法。利用非线性sigmoid传输函数多尺度增强亮度分量，并进行局部对比度增强后获得亮度增益曲面，最后利用亮度增益曲面对原彩色图像RGB三颜色分量同比增强，保证了色调恒定不失真。几种算法实验结果的比较和分析。表明，这种算法是有效的。[著者文摘]

After analyzing Retinex theory and its typical algorithm for color image enhancement, a new hue preserving algorithm for color image enhancement was presented. Firstly, it utilized a nonlinear sigmoid transfer function to intensify the image brightness component at multi-scale, and then brightness gain curved surface was acquired by reinforcing the image local contrast, finally the original color image RGB three components were enhanced at the same proportion by brightness gain curved surface, which ensured the hue was constant and undistorted. Experimental results of the proposed algorithm and other algorithms were compared and analyzed to illustrate the effectiveness of the proposed method.[著者文摘]

图像增强算法及其实现

Image Enhancement Calculation and Realization

杨乐

图像增强是对数字图像的预处理,对图像整体或局部特征能进行有效地改善。如何有效地增强图像是图像分析中的一个难点。针对图像灰暗、边缘轮廓模糊不清这一问题,提出了用直方图均衡化、规定化方法增强图像,且明显地增强了图像的细节部分的理论。分析和仿真结果均表明,该算法能够充分提高图像的灰度级、对比度、及动态范围。[著者文摘]

Image enhancement which is also called image preprocessing plays an indispensable role in signal image processing. How to improve image is always a diffieult problem. As the result of the problem of pieture ash dark, the image outline unelear,the method of using algorithm histogram equalization and histogram speeifieations to image enhancement,whieh is also good at enhaneing the edge details of image is proposed. Both the theory analysis and the experimental results show that the method can improve image gray degree,eontrast degree, and dynamie state scope.[著者文摘]

自适应图像直方图均衡算法

Self-adaptive image histogram equalization algorithm

张懿 刘旭 李海峰

为了改善直方图均衡对低灰度层密集分布图像的处理效果，通过分析图像直方图均衡理论对同一灰度像素在处理后映射到同一灰度的过程中存在的理论缺陷，提出了一种高效的、自适应的算法。该算法首先对图像进行常规的直方图均衡处理，然后对处理后所形成的图像灰度在一个较大的灰度范围内进行映射，保证变换后的图像有较大的灰度动态范围，最后对结果进行适当的亮度修正，保证变换图像整体有较高的对比度，便于观察图像的细节．通过实验证明，改进后的算法可以明显地改善直方图均衡处理低灰度层密集分布图像的效果，同时具有较高的算法效率，适合在实时图像处理系统中采用。[著者文摘]

There are disadvantages in the image histogram equalization algorithm when it maps the pixels in the same gray level to the same new gray level, which results in unsatisfactory performance of the processed image, especially when the picture has many pixels distributed at low gray levels. To resolve this problem, an improved self-adaptive image histogram equalization algorithm was presented. After the image histogram equalization processing, the new method extends the gray levels to ensure the pixels distribute at large-scale gray levels and corrects the brightness of the resulting image to make the details be seen easily. Theoretical analysis and experiments showed that the algorithm is effective for histogram equalization to low gray level distributing image and that it is relatively better for real-time image processing system.[著者文摘]

利用逆向迭代法修正MRI图像中刚性运动伪影的研究

周杰[1] 侯正松[2] 温志波[1] 陈武凡[2]

目的 提出逆向迭代修正法(IIC)和基于直方图的熵准则函数，消除MRI图像中刚性平移运动伪影。方法 利用该熵函数建立的准则，IIC方法通过两个连续的步骤来消除仿真运动伪影：①在所有可能的运动方向上添加逆向相位差；②利用熵判断函数估计出实际的运动方向和位移，从而消除运动伪影。结果 为了检验方法的可行性，通过对模板和医学图像的仿真实验，验证了逆向迭代修正法(IIC)和基于直方图的熵准则函数的有效性和精确性。结论 IIC方法能够有效消除MR图像刚性平移运动伪影。

直方图实现图像增强的应用

蒋洪波 冯新宇

为了将图像中感兴趣的特征有选择地突出，而衰减其不需要的特征，要对灰度图进行灰度修正，这里主要讲述了用直方图均衡化实现图像增强，能够使图像具有所需要的灰度分布，从而有选择地突出所需要的图像特征。

书籍扫描图像的纠正

钟晓刚 李新友 等

扫描书籍时，因为书脊部分远离扫描平面，扫描得到的图像会有变形、明暗不均、模糊等缺点，针对这个问题，在分析书籍空间形状模型的基础上，提出了基于图像边缘提取、线性图像变换和分片直方图修正的综合解决方法。实验结果表明，该方法能够快速、准确地解决书籍扫描图像存在的变形和明暗不均问题。

基于遗传算法的辐射图像对比度增强

Radiation image contrast enhancement based on genetic algorithm

郭肖静 吴志芳

基于遗传算法和非完全Beta函数，介绍了一种自适应的图像对比度增强方法，并将其应用到辐射图像的增强处理中。Tubbs利用归一化的非完全Beta函数（Incomplete Beta Function），来实现几种典型的灰度变换曲线的自动拟合。在实现了该函数的基础上，通过基于遗传算法的自适应搜索确定Beta函数的最佳参数，并对遗传算子做了一定改进，从而确定相应的最佳变换曲线。将该方法应用于集装箱检测图像的对比度增强，通过对实验结果的比较，说明了该方法的优越性。[著者文摘]

Based on genetic algorithm and incomplete beta function, we introduce a self-adaptive method for image contrast enhancement and apply this method to radiograph image enhancement. Tubbs integrated the several common nonlinear functions of gray transform as a normalized incomplete beta function for realizing image enhancement, and by taking use of self-adaptive searching algorithm, optimal parameters of incomplete beta function can be determined, thereby determining the corresponding optimal transform curve. In this paper, incomplete beta function and genetic algorithm are applied in contrast enhancement of container cargo inspection image, and the advantages of this method are well illustrated by comparing the experimental results.[著者文摘]

基于3D直方图联合面部特征的人脸跟踪系统

Real-time Face Tracking System Based on 3D Histogram Combining with Facial Features

李俊杰[1,2] 刘超[1] 沈海涛[1,2] 郝重阳[1] 樊养余[1]

针对人脸跟踪中存在的实时性和准确性难以同时兼顾的问题,提出了一种基于三维直方图肤色模型联合面部特征提取的人脸跟踪算法,采用网格映射缩略图、运动矢量预测和搜索窗参数修正等方法来提升算法的性能,从而既提高了算法的执行效率,又保证了算法的准确性,最终实现了一套人脸跟踪系统。仿真结果表明,该系统能够克服复杂背景的影响,准确的检测出有效的人脸,并对人脸进行实时跟踪,具有较强的鲁棒性。[著者文摘]

Considering the difficulty of the balance of real-time property and precision property of face tracking, a new face tracking method based on 3D histogram skin colors model combined with facial feature extracted was introduced. With the help of grid mapping miniature and prediction of motion vector and emendation of parameters of search window, an integrated real-time face tracking system was implemented. The result demonstrates that it could get over the influence of the complicated background to pick up and track human face exactly as a real-time and robust system.[著者文摘]

工序质量管理方法的优化

Optimize to Method of Quality Control in Working Procedure

包凤达

本文简化了xˉ-R控制图中各参数的估计；设计了直方图和工序能力指数动态应用工具。运用Excel软件使得计算便捷、界面直观、信息丰富。关键词：控制图；参数估计值；直方图；动态应用[著者文摘]

This paper predigest the parameter estimation in xˉ-R control chart; Designed the dynamic application tool to histogram and working procedure cel, make the calculation convenient, the interface ability index. Passed to use the software of Exkeeps view, information plenty fullness.[著者文摘]