共查询到20条相似文献,搜索用时 109 毫秒
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我们将告诉大家如何对夜间摄影作品中刺眼的数码噪点进行选择性优化处理。他很有"感觉"的胶片颗粒不同,由异色像素等杂讯形成的数字噪点并不讨人喜欢,它被视为干扰和降低画质的表现。使用lSO 200这样较低的感光度设置,在慢速快门的配合下能帮助我们捕捉城市夜景的绚烂,得到一幅曝光正确的作品, 相似文献
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我们将告诉大家如何对夜间摄影作品中刺眼的数码噪点进行选择性优化处理。他很有"感觉"的胶片颗粒不同,由异色像素等杂讯形成的数字噪点并不讨人喜欢,它被视为干扰和降低画质的表现。使用lSO 200这样较低的感光度设置,在慢速快门的配合下能帮助我们捕捉城市夜景的绚烂,得到一幅曝光正确的作品,同时也能避免高感光度 相似文献
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本文以均值0的高斯噪声为对象,研究了维纳滤波器的二维图像降噪作用,并基于贝叶斯估计建立了小波阈值图像降噪算法。算法仿真表明维纳滤波的峰值信噪比随噪声增加而单调降低,窗宽5×5时综合降噪效果较好,但所恢复图像对比度低;本文建立的小波阚值方法其峰值信噪比在不同噪声下均比维纳方法高,并且所恢复图像的对比度提高。 相似文献
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RMS粒度是照相材料成像质量的重要特性。使用显微光密度计-电子计算机系统进行该项测定是目前最为先进的方法。这种方法自动进行数字采样,按编制好的程序计算,具有快速简便的优点。但测试过程中有许多重要环节,如果处理不当,计算出的结果值就完全不能代表样品的粒度水平而只是一个完全错误的结果。本文通过设计的各种实验,研究了仪器系统噪声,样品中宏观密度不均及影像数字化时采样间距对RMS粒度测值的影响。结果表明,必须选取恰当的实验参数和数据处理方法,才能消除上述各种干扰,得到RMS粒度的正确估值,同时,本文还对数字模拟光孔与真实光孔的RMS粒度测值作了比较,得到了有实际应用价值的结果。 相似文献
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Digital image representation is perceptually uniform if a small perturbation of a component value—such as the digital code value used to represent red, green, blue, or luminance—produces a change in light output at a display that is approximately equally perceptible across the range of that value. Most digital image coding systems—including sRGB (used in desktop graphics), BT.709 (used in high‐definition television, HD), Adobe RGB (1998) (used in graphics arts), and DCI P3 RGB (used in digital cinema)—represent colour component (pixel) values in a perceptually uniform manner. However, this behavior is not well documented and is often shrouded in confusion. This article surveys perceptual uniformity in digital imaging and attempts to clarify some widely misunderstood aspects of image coding. © 2013 Wiley Periodicals, Inc. Col Res Appl, 39, 6–15, 2014 相似文献
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针对扫描电化学显微镜扫描出来的图像除了含有噪音外,常伴有一些小的亮细节,小波阈值降噪无法消除亮细节的情况,采用数学形态学对图像进行降噪并减弱亮细节,再用小波阈值对图像进行二次降噪,并将图像转换为三维图形,有较好的图像处理效果,该功能基于Visual C 与Matlab混合编程实现,代码简单易于实现. 相似文献
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A digital imaging approach was applied to investigate mortar morphology in thin sections; in particular, the binder/aggregate ratio and the grading curve of five mortar bars were attained by digital image processing (DIP), using the Image Pro Plus 4.1 software package. The imaging procedure employed image segmentation, to extract mortar aggregate, and image filtering, to fix grain boundaries. The results show that digital image processing may be considered as an alternative method to mechanical sieving for the characterisation of mortar morphology, as it appears to be quicker and more accurate than the traditional method. However, digital image processing exhibits limits, which are discussed in the text. 相似文献
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阐述了成像输出技术 ,归纳了现代主要的几种成像输出技术和记录设备。重点论述了硬拷贝输出技术与设备 ,并介绍了APS智能彩扩系统、数字印刷与扩印系统、数字扩印与网络一体化技术等硬拷贝输出设备的最新技术。 相似文献
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Algy Kazlauciunas 《Coloration Technology》2014,130(1):8-12
The purpose of this review is to highlight the important role that dye and pigment colorants play in the areas of image generation, image storage, and image output with respect to digital still images. Colorants in the form of dyes and pigments play an integral part in the digital still imaging process, from the initial conversion of the original greyscale image into a full‐colour RGB additive image, followed by electronic image storage, and finally to hard‐copy output via non‐impact printing technologies such as inkjet and thermal dye transfer. In addition, both dyes and pigments are also utilised for image generation in the fast‐developing world of electronic paper display technologies. Dyes and pigments were the mainstay of many of the early analogue photographic processes in the areas of image capture and image reproduction, and this review sets out to show that, in the new age of digital imaging, this situation is still prevalent. 相似文献