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This study suggests a method to improve the speed of a sliding window type of face detector by way of skin color region detection. The face detection method by way of skin color region detection has been studied in various perspectives: Complicated background images because of the area whose color is similar to the skin color cause high false positive rates. In contrast, the face detection method based on appearance, which adopts a sliding window type, may involve high face detection rates but cause tremendous computational costs in the process of detection scanning as the image size increases, whereas the processing time is also extended accordingly. This study suggests a method to control the subwindow size and detection area of a sliding window by detecting and using the skin color region with the processing time reduced. By means of a face detector with haar wavelet and LBP features, 274 images were collected online in addition to Bao database images, and then an experiment was conducted with them. As a result, the face detection time in utilization of an existing sliding window decreased down to a maximum of 47%. 相似文献
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Human skin detection is an essential step in most human detection applications, such as face detection. The performance of any skin detection system depends on assessment of two components: feature extraction and detection method. Skin color is a robust cue used for human skin detection. However, the performance of color-based detection methods is constrained by the overlapping color spaces of skin and non-skin pixels. To increase the accuracy of skin detection, texture features can be exploited as additional cues. In this paper, we propose a hybrid skin detection method based on YIQ color space and the statistical features of skin. A Multilayer Perceptron artificial neural network, which is a universal classifier, is combined with the k-means clustering method to accurately detect skin. The experimental results show that the proposed method can achieve high accuracy with an F1-measure of 87.82% based on images from the ECU database. 相似文献
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在唇区检测中,应用Haar特征训练Adaboost分类器方法能很好地适应各种背景环境,但是只能得到包含唇部的矩形区域,并不能准确定位嘴唇部分,而常用的唇色分离算法虽然能准确定位唇部,但是对图像的背景环境要求较高。基于此,提出自适应唇色分离方法,该方法是以Haar特征训练Adaboost分类器作为基础,自适应地调整唇色分离的常量参数,从而能够动态地获得唇色与肤色的分布范围,实现准确地获得各类背景图像的唇部区域,很好地提高了唇区检测的精确性和鲁棒性。利用该方法对GENKI数据库中4 000幅图像进行处理,成功地实现唇区检测,并对唇区域边缘图进行曲线拟合来实现定位,实验结果表明在各种复杂背景下,该方法更有效。 相似文献
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针对多人脸场景下快速准确提取人脸内容的问题,提出了基于肤色学习的多人脸前景抽取方法。首先,给出了基于肤色学习的肤色前景分割模型。根据肤色专家的论文结果,采集了著名的SPA数据库的1 200张人脸进行肤色抽样,建立学习模型以得到每个人种在颜色空间的肤色参数,据此进行肤色图像分割,得到肤色前景。其次,利用人脸特征点学习算法,以常见人脸68个特征点为目标,结合肤色前景信息分割出人脸种子区域;并计算人脸中心点,来构建人脸椭圆边界模型以及确定遗传范围。最后,建立了有效抽取算法,在人脸椭圆边界内利用遗传机制进行人脸再生,从而抽取得到有效人脸区域。以三类不同数据库为基础,收集了100张有代表性的多人脸图像,实验结果表明所提方法对这些图像的多人脸抽取的结果准确率达到98.4%以上,且该方法对中密度人群的人脸内容抽取有显著效果,并为人脸识别算法的准确性和可用性提供了基础。 相似文献
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基于肤色和AdaBoost算法的彩色人脸图像检测* 总被引:1,自引:0,他引:1
针对肤色检测对复杂背景下的图像误检率高和AdaBoost算法对多姿态、多人脸图像检测效果不理想的问题,将基于肤色的人脸检测与基于AdaBoost算法的人脸检测结合起来,提出一种新的人脸检测方法,即首先利用肤色和形态学操作分割肤色区域,再根据人脸区域的统计特性筛选出人脸候选区域,然后用AdaBoost级联分类器对候选区域扫描,以精确定位人脸.实验表明,该方法同时具有肤色检测正确率高与AdaBoost算法误检率低的优点,可以有效地运用于多姿态、多人脸和复杂背景的情况,具有较好的检测效果. 相似文献
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赵男男 《计算机工程与科学》2011,33(5):85-90
针对AdaBoost算法对多姿态人脸检测效果不理想和肤色模型对复杂背景下的图像误检率高的问题,本文将基于肤色的人脸检测与基于AdaBoost算法的人脸检测结合,提出一种由偏到正的检测方法.主要是通过旋转图片,使人脸分类器不会因为角度问题产生漏检,然后根据分类器检测出的两眼,计算两眼之间的位置关系,判断人脸是否处于正面位... 相似文献
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在人机交互领域(Human-Computer Interaction,HCI)中,基于视觉的手势识别因其直观、高效的特点拥有广阔的应用前景。为了改善传统手势识别算法识别率低、鲁棒性差的缺点,基于OpenCV和Keras深度学习框架提出一种简单、快速的手势识别方法作为人机交互的接口。手势图像经过3个处理阶段:预处理、特征提取和分类。对输入图像进行预处理,使用YCbCr肤色模型提取出手部肤色区域,将其转化为灰度图像。使用卷积神经网络对手势图像进行特征提取和分类。实验结果表明:提出的手势识别方法识别率很高,达到99.43%,且具有较好的鲁棒性。与传统的人工选取特征相比,卷积神经网络能够有效地进行特征学习。 相似文献
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We propose a face detection method based on skin color likelihood via a boosting algorithm which emphasizes skin color information while deemphasizing non-skin color information. A stochastic model is adapted to compute the similarity between a color region and the skin color. Both Haar-like features and Local Binary Pattern (LBP) features are utilized to build a cascaded classifier. The boosted classifier is implemented based on skin color emphasis to localize the face region from a color image. Based on our experiments, the proposed method shows good tolerance to face pose variation and complex background with significant improvements over classical boosting-based classifiers in terms of total error rate performance. 相似文献
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Michal Kawulok 《Multimedia Tools and Applications》2010,49(3):463-481
This paper addresses a problem of precise skin segmentation necessary for sign language recognition purposes. The main contribution
of the presented research is an adaptive skin model enhanced with a blob analysis algorithm which significantly reduces false
positives and improves skin segmentation precision. Adaptive skin detector utilizes a statistical skin color model updated
dynamically based on a face region defined by eye positions. Face geometry is used for face and eye detection in luminance
channel prior to the model adaptation. Color-based skin detectors classify every pixel separately which results in high false
positives for background pixels which color is similar to human skin. The proposed blob analysis technique verifies detected
skin regions by taking into account pixel topology. The experiments for ECU database showed that with the proposed approach
false positive rate was reduced from 15.6% to 6% compared with a statistical model in RGB, which can be regarded as a significant improvement. 相似文献
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自然界存在很多和肤色相似的颜色,给人脸检测带来了很多的困难。提出了结合Cg-Cb颜色空间的圆形肤色聚类分布和Cg-Cr颜色空间的平行四边形肤色聚类分布的肤色检测法。实验结果发现在人脸处于复杂背景的条件下,该方法简单易行,检测速度快,能去除大量的非肤色,并且极好地保留了肤色。 相似文献
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为实现对光笔投射点的实时跟踪,采用了Camshift跟踪算法,但是该算法在动态复杂背景及在颜色相似的背景区域中不能很好地进行跟踪。因此,提出了改进方法。首先,引入红色滤镜,以此改变Camshift算法颜色特征提取的效果,从而削弱了背景的影响,突出了目标,很好地克服了背景中的颜色干扰,使动态复杂背景下光笔投射点的跟踪具有较高的鲁棒性和实时性;然后通过改变区域选择方式,达到了自动跟踪的效果;最后,通过OpenCV实现了对光笔投射点的实时跟踪。实验结果表明,该方法在光笔投射点实时跟踪上是十分有效的。 相似文献
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彩色图像中通常存在噪音、模糊、背景等问题,直接影响到人脸检测的结果。提出一种AdaBoost算法结合图像增强和肤色分割的人脸检测新方法。对输入图像进行平滑、锐化图像增强操作,较好地消除噪声干扰和增强图像的边缘信息;利用肤色分割,将肤色区域和背景有效地区分开;在候选区域用AdaBoost算法精确地定位出人脸位置。实验结果证明,该方法对“漏检”和“错检”问题均有较好的改善。 相似文献
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为了在提高复杂背景下的人脸检测率的同时减少检测时间,将肤色分割和Haar方差特征相结合,在YCbCr颜色空间通过椭圆肤色模型和logistic回归分析确定每一点的肤色概率,生成肤色概率图,从而将每一点的像素值映射到[0,1],在Ostu方法的基础上采用并行的遗传算法确定肤色分割的阈值,快速分割出人脸区域;最后用少量的Haar方差特征取代原来的Haar特征,并采用SVM训练分类方法对分割出的人脸区域进行验证。实验表明,该方法不仅提高了人脸检测的正确率,而且具有较快的人脸检测速度。 相似文献
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