共查询到20条相似文献,搜索用时 625 毫秒
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数字图像拼接方法研究进展 总被引:4,自引:0,他引:4
数字图像拼接是指将具有重叠区的多幅数字图像或多帧视频通过配准和融合获得单幅宽视场图像或者动态全景图.数字图像拼接方法主要包括图像配准算法和图像融合算法.根据待拼接图像和拼接图像的特点,介绍图像拼接的4种基本类型,说明图像拼接的研究意义,概述近年来图像拼接方法的研究状况,最后分析图像拼接方法的研究动向. 相似文献
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由于图像降质过程的复杂性、成像获取条件限制,以及图像本身的复杂性和图像复原过程的病态性,图像复原解大多都是近似的或畸变的,一种适应于图像复原质量评价的计算方法将大大提升图像复原的应用范围。针对图像复原过程的病态性,提出了一种针对图像复原图像质量评价的计算方法,该算法通过在图像质量算子中引入图像相似矩阵和图像复原趋势矩阵,使其能适应复原对于图像结构或噪声结构的变化。该图像质量评价算子计算无需参考图像,可以很好地反映图像的模糊程度和噪声程度,并且计算简单。实验证明了该图像质量评价算子的有效性。 相似文献
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针对在高动态范围图像合成的过程中有噪声影响图像的质量这一问题,采取一种基于多曝光图像的高动态范围图像合成降噪算法。通过对各曝光图像的灰度数据进行提取、整理、分析,能合成代表原始场景光线分布的亮度图像。通过分析噪声对高动态范围图像合成质量的影响,提出在图像合成前将图像中含有的噪声进行处理。根据光子散粒噪声变化的特点,将图像混有的噪声问题转化为求解一个多曝光图像序列组的平均值问题,合成的图像视觉效果与真实图像极为接近。 相似文献
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Perceptual image hash is an emerging technology that is closely related to many applications such as image content authentication, image forging detection, image similarity detection, and image retrieval. In this work, we propose an image alignment based perceptual image hash method, and a hash-based image forging detection and tampering localization method. In the proposed method, we introduce an image alignment process to provide a framework for image hash method to tolerate a wide range of geometric distortions. The image hash is generated by utilizing hybrid perceptual features that are extracted from global and local Zernike moments combining with DCT-based statistical features of the image. The proposed method can detect various image forging and compromised image regions. Furthermore, it has broad-spectrum robustness, including tolerating content-preserving manipulations and geometric distortion-resilient. Compared with state-of-the-art schemes, the proposed method provides satisfactory comprehensive performances in content-based image forging detection and tampering localization. 相似文献
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相比传统的基于整数阶微分的图像增强算子,分数阶微分增强算子能提升图像的高频边缘信息,且非线性保留图像纹理细节和平滑区域的中低频信息。文中根据Riemann-Liouville分数阶微分定义,构造了5×5大小的分数阶微分增强算子模板,同时采用传统的整数阶图像增强算子Sobel算子、Prewitt算子和Laplacian算子,分别对灰度图像和彩色图像进行图像增强处理实验。最后,引入图像熵的计算,对图像增强的结果进行熵值大小的计算与分析。随着分数阶微分阶次的增加,分数阶微分增强算子处理后的图像熵值呈上升趋势,说明图像的纹理细节信息得到了加强。 相似文献
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针对图像复原的同时要求保留图像边缘信息的矛盾,利用图像的梯度模,提出了一种保留图像边缘信息的图像复原方法。本方法对图像修复的同时,具有保护图像边缘的作用。实验表明本方法在去除噪声和信噪比上取得了较好的效果。 相似文献
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Image definition measurement plays an important role in various image processing applications. And a reliable objective image definition metrics is critical for evaluating the definition of the restored image. In this paper, a novel image distortion metric based on minimal Total Bounded Variation (TBV) is presented. It is clarified that when the restored image approximates to the original clear image, the smaller the TBV is, the better the definition of the restored image is. Furthermore, the difference between the restored image and the original clear image is the smallest when the TBV is minimum. In numerical results, the TBV of the original clear image, blur image and restored image are presented and compared, and the results demonstrate the validity of the distortion metric proposed. 相似文献
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利用红外偏振信息(偏振度、偏振角)对目标进行成像,可以更好地抑制图像的背景噪声,提高信噪比。而且偏振信息相对于光强信息一般会蕴含更丰富的目标边缘轮廓信息。因此,提出一种将红外辐射光强图像和偏振度图像进行融合的算法。此方法首先对参与融合的每幅图像分别进行拉普拉斯金字塔分解,获得每层的分解图像;然后对分解后的每层图像采用不同的融合方法进行图像融合,获得每层融合图像,并对每层融合后的图像进行图像重构,得到最后的融合结果。多幅图像融合后的效果表明该方法能够增加图像的信息量,有利于场景感知和目标识别。 相似文献
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Embedded colour image coding for content-based retrieval 总被引:1,自引:0,他引:1
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In this paper, we propose a simple but effective shadow removal method using a single input image. We first derive a 2-D intrinsic image from a single RGB camera image based solely on colors, particularly chromaticity. We next present a method to recover a 3-D intrinsic image based on bilateral filtering and the 2-D intrinsic image. The luminance contrast in regions with similar surface reflectance due to geometry and illumination variances is effectively reduced in the derived 3-D intrinsic image, while the contrast in regions with different surface reflectance is preserved. However, the intrinsic image contains incorrect luminance values. To obtain the correct luminance, we decompose the input RGB image and the intrinsic image. Each image is decomposed into a base layer and a detail layer. We obtain a shadow-free image by combining the base layer from the input RGB image and the detail layer from the intrinsic image such that the details of the intrinsic image are transferred to the input RGB image from which the correct luminance values can be obtained. Unlike previous methods, the presented technique is fully automatic and does not require shadow detection. 相似文献