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多菌灵、井冈霉素及其复配剂对水稻纹枯病菌的增效作用 总被引：3，自引：0，他引：3
采用菌丝生长速率法分别测定了多菌灵和井冈霉素及其复配剂对水稻纹枯病菌(Rhizoctonia Sola-ni)的毒力,并用W adley增效比率法评价2种杀菌剂的联合作用。试验结果表明,当多菌灵:井冈霉素按1:4,1:9的比例混配时,其协同作用比率分别为2.27和1.60,表现为增效作用。 相似文献
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提出了一种基于小波阈值去噪的语音增强算法。根据含噪语音中噪声、清音和浊音的不同特点,首先对它们进行检测区分,然后采用改进的Garrote阈值函数分别对噪声、清音和浊音运用不同的阈值方案进行处理。该方法在很大程度上抑制了噪声,又减少了语音段清音的损失,提高了信噪比,在MATLAB7.1中的仿真实验结果表明,该方法具有较好的增强效果。 相似文献
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L. Gregory Appelbaum Graham Erickson 《International review of sport and exercise psychology》2018,11(1):160-189
Athletes need excellent vision to perform well in their sports, and many athletes have turned to vision training programs as a way to augment their traditional training regimen. The growing practice of ‘sports vision training’ relies on the notion that practice with demanding visual perceptual, cognitive, or oculomotor tasks can improve the ability to process and respond to what is seen, thereby improving sport performance. This enterprise is not necessarily new, but has been advanced greatly in the past few years by new digital technology that can be deployed during natural training activities, by perceptual-learning-inspired training programs, and by virtual reality simulations that can recreate and augment sporting contexts to promote certain sports-specific visual and cognitive abilities. These improved abilities may, in turn, instill a competitive advantage on the playing field, underscoring the potential value of these approaches. This article reviews emerging approaches, technologies and trends in sports vision training. Where available, critical review of supporting research is provided. 相似文献
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图像在获取和传输过程中,会受到各种噪声的干扰,使图像退化,质量下降,对分析图像不利。图像的平滑或去噪一直是数字图像处理技术中的一项重要工作。为此,论述了在空间域中的各种数字图像平滑技术方法。 相似文献
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低对比度图像增强与边缘提取 总被引：1，自引：0，他引：1
樊玲 《乐山师范学院学报》2005,20(12):43-44
针对低对比度图像增强和边缘检测问题，提出基于小波变换并结合中值滤波增强和Sobel算子边缘检测的变换处理方法，能获得尽可能完整的图像特征。 相似文献
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Two librarians at the University of Louisville explain how a university-wide Quality Enhancement Plan focused on critical thinking led to positive changes in information literacy instruction at their institution. A revised information literacy module for an introductory business course serves as an example of a new instructional approach that emphasizes critical thinking about information, rather than library tools such as catalogs and databases. 相似文献
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Kristine M. Alpi James C. Brown Jr. Jennifer A. Neel Carol B. Grindem Keith E. Linder James B. Harper 《Journal of the Medical Library Association》2016,104(1):15-23
Objective
Clinical and research usefulness of articles can depend on image quality. This study addressed whether scans of figures in black and white (B&W), grayscale, or color, or portable document format (PDF) to tagged image file format (TIFF) conversions as provided by interlibrary loan or document delivery were viewed as acceptable or useful by radiologists or pathologists.Methods
Residency coordinators selected eighteen figures from studies from radiology, clinical pathology, and anatomic pathology journals. With original PDF controls, each figure was prepared in three or four experimental conditions: PDF conversion to TIFF, and scans from print in B&W, grayscale, and color. Twelve independent observers indicated whether they could identify the features and whether the image quality was acceptable. They also ranked all the experimental conditions of each figure in terms of usefulness.Results
Of 982 assessments of 87 anatomic pathology, 83 clinical pathology, and 77 radiology images, 471 (48%) were unidentifiable. Unidentifiability of originals (4%) and conversions (10%) was low. For scans, unidentifiability ranged from 53% for color, to 74% for grayscale, to 97% for B&W. Of 987 responses about acceptability (n=405), 41% were said to be unacceptable, 97% of B&W, 66% of grayscale, 41% of color, and 1% of conversions. Hypothesized order (original, conversion, color, grayscale, B&W) matched 67% of rankings (n=215).Conclusions
PDF to TIFF conversion provided acceptable content. Color images are rarely useful in grayscale (12%) or B&W (less than 1%). Acceptability of grayscale scans of noncolor originals was 52%. Digital originals are needed for most images. Print images in color or grayscale should be scanned using those modalities. 相似文献10.
直方图均衡处理是一种重要的图像增强方法。本文在介绍直方图均衡处理方法原理的基础上分析了直方图均衡处理方法的优缺点。 相似文献