共查询到18条相似文献,搜索用时 109 毫秒
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针对基于图像边缘缩放处理导致的图像边缘瑕疵或模糊现象,提出一种边缘自适应Catmull-Rom样条图像缩放插值算法.该算法以相邻4个源像素点构造一段以3次多项式函数为基础,自动选择与目标像素点相适应的像素组进行插值运算.重点描述了该算法应用于图像缩放处理的硬件实现结构,并通过功能仿真.最后,由Sobel边缘检测函数对目标图像进行边缘检测.结果表明,该算法能够获得边缘清晰的真彩色目标图像. 相似文献
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首先介绍了一种改进的自适应插值算法,并在此基础上论述了基于自适应插值算法的FPGA系统的设计与实现。期望通过该文的研究能够对视频图像缩放效果的提升有所帮助。 相似文献
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基于FPGA的高分辨实时监控图像缩放设计 总被引:1,自引:1,他引:0
介绍了一种基于图像的双三次线性插值缩放算法的设计方法,并通过FPGA验证了设计的可行性.重点讨论了视频缩放的插值算法,对两种实现方法在硬件资源利用率及实施效率方面进行了比较并论证了块状插值实现方法的优越性.最终设计实现了高分辨率实时视频图像的缩放. 相似文献
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针对轨道交通调度显示系统中监控视频控制器的实际需求,介绍了双3次插值图像放缩算法和抗混叠滤波器的原理,提出了作为视频控制器核心的图像缩放技术的功能划分,分析了基于现场可编程门阵列(FPGA)的图像缩放技术实现的工作流程,论述了输入缓冲、图像缩放、帧频调整和图像拼接等功能模块的详细功能和实现方案,完成了对该技术实现的仿真分析,比较了该技术实现与传统图像缩放技术的仿真结果。 相似文献
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Darwish A.M. Bedair M.S. Shaheen S.I. 《Vision, Image and Signal Processing, IEE Proceedings -》1997,144(4):207-212
Applying an interpolation function indiscriminately to an image, to resample it, will generally result in aliasing, edge blurring and other artefacts. The authors present an adaptive resampling algorithm for zooming up images. The algorithm is based on analysing the local structure of the image and applying a near optimal and least time-consuming resampling function will preserve edge locations and their contrast. This is done by segmenting the image dynamically into homogeneous areas, as it is scanned or received. Based on the location of the pixel to be computed (whether it is within a homogenous area, is on its edge or is an isolated feature), interpolation, extrapolation or pixel replication is chosen. The algorithm performance, from both a quality and a computational complexity aspect, are compared to different methods and functions previously reported in the literature. The advantage of the algorithm is quite apparent at edges and for large zooming factors 相似文献
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针对传统图像放大处理过程中基于线性插值方法通常导致边缘模糊问题,分析了Tikhonov模型、全变差模型和高阶偏微分模型在图像处理中的优缺点,提出了一种全变差和高阶偏微分模型自适应结合的图像放大模型及推导算法。该模型对图像非平滑区域采用全变差模型处理,而平滑区域则采用高阶偏微分模型处理,最终新插入的图像点象素值由该点邻域象素自适应地各向异性加权得到,在保持图像边缘锐度的同时有效克服了平滑区域的阶梯效应。4种模型的实验比较验证了本文算法的有效性。 相似文献
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This paper presents a low complexity joint color demosaicking and digital zooming algorithm for single-sensor digital cameras. The proposed algorithm directly extracts edge information from raw sensor data for interpolation in both demosaicking and zooming to preserve edge features in its output. This allows the extracted information to be exploited consistently in both stages and also efficiently, as no separate extraction process is required in different stages. The proposed algorithm can produce a zoomed full-color image as well as a zoomed Bayer color filter array image with outstanding performance as compared with conventional approaches which generally combine separate color demosaicking and digital zooming schemes. 相似文献
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针对传统插值算法在图像整体缩放中边缘区域易产生锯齿或模糊的现象,提出一种新型的图像缩放算法.将相邻像素形成的矩形区域进行三角剖分,根据待构造曲线段的位置关系及插值控制点的距离大小构造辅助的控制顶点,再利用相应的Bézier曲线插值图像构造的辅助控制点,最后以产生的Bézier曲线作为边界曲线,利用Coons曲面构造方法构造出退化的三角形曲面片进行边缘细节的强化。提出的方法可以很好地保持图像边缘细节,尤其在倾斜的边缘和尖角等处保持了更多的细节特征,使放大的图像有更好的效果。 相似文献
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