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总有界变差与图像清晰度之间的关系 总被引:1,自引:0,他引:1
针对目前几种数字图像清晰度评价方法的局限性,研究了图像的总有界变差,理论上证明了图像总有界变差与图像清晰度之间的关系. 在图像恢复过程中,使图像的总有界变差达到极值,可以使所恢复的图像更清晰. 通过计算机仿真,比较了清晰图像与模糊图像的总有界变差,并验证了有关结果. 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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树叶锯齿特征的提取对于研究植物内部的基因关系至关重要。为了克服现有算法的局限性,本文提出一种基于有界变分的树叶锯齿特征提取算法,以有效提取树叶锯齿的数量、深度和宽度等多维特征,从而为后续的基因分析提供重要依据。首先对树叶图像进行预处理以得到其轮廓坐标;然后计算整个叶片相邻像素点之间的斜率变分,以实现初步的角点检索;再通过估算锯齿深度进行误差补偿,从而得到锯齿角点及其凹点,最终估算出锯齿的多维特征。本文利用瑞典的白杨树叶(12 000片)对所提算法进行验证。大数据验证表明,本文算法能够批量提取树叶锯齿个数、宽度和深度等特征,其中锯齿数量的识别准确度达到86.3%。 相似文献
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Non-stationary time series could be divided into piecewise stationary stochastic signal. However, the number and locations of breakpoints, as well as the approximation function of the respective segment signal are unknown. To solve this problem, a novel on-line structural breaks estimation algorithm based on piecewise autoregressive processes is proposed. In order to find the "best" combination of the number, lengths, and orders of the piecewise autoregressive (AR) processes, the Akaikes Information Criter... 相似文献
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总有界变差与图像清晰度之间的关系 总被引:1,自引:1,他引:0
针对目前几种数字图像清晰度评价方法的局限性,研究了图像的总有界变差,理论上证明了图像总有界变差与图像清晰度之间的关系. 在图像恢复过程中,使图像的总有界变差达到极值,可以使所恢复的图像更清晰. 通过计算机仿真,比较了清晰图像与模糊图像的总有界变差,并验证了有关结果. 相似文献