共查询到20条相似文献,搜索用时 15 毫秒
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手背静脉图像二值化阈值算法 总被引:3,自引:3,他引:0
因为传统分割算法对图像细节特征信息不敏感,分割效果不理想,提出了一种确定阈值的改进方法。该算法在阈值图像法的基础上,采用迭代计算平均值的方法,动态地获得每个像素点位置的最佳阈值,以获取一幅与原图像大小相同的阈值图像,利用该阈值图像对原静脉图像进行二值化处理,增强了图像的局部细节特征信息。仿真实验证明了该改进算法的有效性。 相似文献
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《成像科学杂志》2013,61(5):408-418
AbstractThis paper proposes an objective distortion measure for binary images. Whereas most previously proposed measures decide the distortion weight of a distorted pixel based on the relationship with the neighbouring pixels in the spatial domain, we observe the characteristics of distorted pixels in multi-spectral spatial-frequency bands. Similarities between the binary wavelet transform and the human visual system are utilised to obtain the distortion weight. When we decide the distortion weight of a distorted pixel, we consider flatness, edge orientation and texture complexity of the distorted pixel at each level of binary wavelet decomposition. Experimental results on various sample images show that the proposed measure is more adequate to human than previously proposed measures. 相似文献
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本文提出了一种二值模式的快速细化方法,该算法能有效地抑制模式上的“毛刺”,快速提取保持原始图象连通性和拓扑性的骨架,它的处理速度和效果明显优于文献[1]中所述的算法。文中我们给出了两种算法对汉字“国”和“E”,“H”,“G”等字母处理后的结果。 相似文献
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本文探讨HIS变换对数字化航空片影象与landsat TM多光谱影象进行复合的方法,并在此基础上提出一种改进的方法。试验结果表明本文提出的方法是一种非常行之有效的方法。复合后的影象不仅保留了TM影像的光谱特征,而且将其空间分解力由30m提高到10m,清晰度也提高了。因而复合后的影像能提高分类精度,制作专题图的精度、多时相监测能力和解译水平等。 相似文献
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分水岭变换和统计区域合并的图像分割算法研究 总被引:1,自引:0,他引:1
提出了一种基于分水岭变换和统计区域合并的图像分割方法.该方法综合利用高斯低通滤波、分水岭变换和统计区域合并,先对原始图像提取分割标记,然后利用Meyer分水岭变换对标记分水岭进行分割,最后利用概率统计的方法对过分割区域进行合并.该算法通过调节尺度参数可以实现由粗到细(coarse-to-fine)的分割.实验结果表明,这种简单可行的算法在分割噪声图像时依然有良好的效果,具有较强的鲁棒性. 相似文献
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二值图像中的游程编码区域标记 总被引:15,自引:1,他引:15
由于处理时间及存储空间的限制,常规的区域标记算法往往无法满足实时图像处理的需要。针对这些不足,提出了一种新的快速区域标记算法。通过改变游程编码的存储结构,建立编码间的亲缘关系,实现快速地址寻访,完成二值图像中所有区域目标对象的标记过程。与传统的标记算法相比,降低了算法复杂度,缩短了处理时间。 相似文献
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An authentication watermark is a hidden data inserted into an image that can be used to detect any accidental or malicious alteration in the image. Many authentication‐watermarking techniques for continuous‐tone images are described in the literature, but only a quite small number of secure authentication watermarking techniques are available for binary/halftone images. This article proposes a simple solution for inserting a secure authentication watermark in binary/halftone images. It consists of choosing a set of pseudo‐random pixels in the image, clearing them, computing the message authentication code (or the digital signature) of the now‐cleared image, and inserting the resulting code into the selected random pixels. Dispersed‐dot halftone images watermarked by the proposed technique present better visual quality than do watermarked generic binary images. However, in practice, the visual degradation is hardly noticeable in either case. The proposed technique seems to be the only binary/halftone watermarking scheme that can detect even a single pixel alteration in the host image. It can be used with secret‐key or public‐key ciphers. © 2004 Wiley Periodicals, Inc. Int J Imaging Syst Technol 14, 147–152, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ima.20018 相似文献
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将遗传算法用于计算云纹干涉图像的二值化阈值,提出基于改进遗传算法的图像分割方法,采用Otsu公式,找出分割图像最优阈值。通过算法实现表明,利用遗传算法所得到的最佳阚值进行二值化处理,效果非常好。 相似文献
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Wei Chen Kenneth C. Williams Timothy J. Donohue Andre Katterfeld 《Particulate Science and Technology》2017,35(5):607-615
Particle dispersion in the vicinity of an agricultural fertilizer spreader is difficult to capture due to the rapid particle traveling motion. This paper introduced a granule impact indentation-based technique to simultaneously record the two-dimensional particle dispersion from a spinning concave disc type of spreader. A Nitrogen-Phosphorus-Potassium (NPK) type of fertilizer was utilized to induce indentations on aluminum foils placed on the wall panels confining an experimental spreader system. Subsequently, an image processing technique which is comprised of the multicolor edge detection, the curve closing, and the region merging techniques was purposely developed to automatically identify and locate the granule impacts on the sampled foil digital images. Overlapping impacts were characterized based on the granulometry of the fertilizer sample. The reconstructed particle dispersion pattern using the image processing method showed good agreement with the experimental observations. The outcome of this research enabled a fast and effective method for quantitatively assessing the particle distribution for a specific fertilizer spreader. 相似文献
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Varun Srivastava Ravindra K. Purwar Anchal Jain 《International journal of imaging systems and technology》2019,29(2):168-179
Many content-based image retrieval techniques like local binary pattern (LBP), local ternary pattern (LTP), local mesh peak valley edge pattern (LMePVEP), local mesh ternary pattern (LMeTerP), etc. extract texture features of an image for retrieval purposes. These techniques use fixed threshold to encode the input image and selection of such threshold value is not guided, that is, a chosen threshold may not be optimal for all images in the database. Moreover the performance of these texture-based static threshold algorithms also decreases if the input images are noisy. In this paper, a dynamic threshold value-based local mesh ternary pattern method is proposed in which the threshold value is chosen from the neighborhood of a central pixel using median of all pixels. The proposed modification reduces the overall effect of noise component and thereby improves the average retrieval rate (ARR) and average retrieval precision (ARP) of the original technique. The proposed modified technique has been compared with five other image retrieval approaches to prove its worthiness - the original local mesh ternary pattern technique (LMeTerP), a local ternary pattern technique (LTP), a Best ensemble technique, a multi-label classification CNN model and a CNN-based model of the proposed approach using a VIA ELCAP lung database and an Emphysema database. An improvement of 3.92% in ARR and 2.53% in ARP is observed over the basic local mesh ternary pattern method. Further the proposed modification has been combined with CNN concept and its results have also been analyzed. 相似文献
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光栅隐形潜像防伪技术研究 总被引:2,自引:2,他引:0
目的研究借助光栅材料实现高档印品的防伪技术。方法结合光栅材料特殊的光学特性和半色调图像加网技术,提出隐形潜像防伪技术,采用最小阈值矩阵的原理,实现变角度加网防伪技术。详细论述每种防伪技术的原理,分别使用Photoshop和Matlab编程模拟来实现这些算法。结果以EPSON Stylus Pro7880C为图像输出设备,在隐形潜像防伪技术中,当光栅片线条角度与印刷品呈45°或135°时,可以清晰看到隐藏的潜像信息;在变角度加网中,使用对应光栅在特定角度21.14°条件下叠加在含水印图像上,清楚地观察到了防伪信息。结论通过实验,表明光栅隐形潜像防伪技术在印品防伪中具有较好的应用效果。 相似文献
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基于二值形态学的木材横切面显微构造特征测量 总被引:1,自引:0,他引:1
为了应用计算机视觉高效、准确地测量出木材的构造特征参数,提出一种基于数字图像处理理论和二值形态学技术的木材横切面显微构造图像分析方法.采用显微镜、摄像传感器、图像采集卡和计算机组成的高精度数字图像动态采集系统,并在彩色图像处理软件平台上,针对木材显微构造细胞的特点进行了软件功能的开发和改进.结果表明,应用此方法能够实现对木材组织分子的形态量、几何量、分布密度、组织比量和胞壁率等参数的测量,在准确性、高效性和自动化程度方面比照以往方法有所改进. 相似文献