共查询到17条相似文献,搜索用时 109 毫秒
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彩色CRT显示器描述颜色特性的数学模型 总被引:2,自引:1,他引:2
以CRT显示器的特征函数与特征矩阵来描述CRT显示器的输入/输出色度特性;建立了CRT显示器数字驱动输入值与其显示颜色三刺激值之间关系的数学模型。 相似文献
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以CRT显示器的特征函数与特征矩阵来描述CRT显示器的输入/输出色度特性;建立了CRT显示器数字驱动输入值与其显示颜色三刺激值之间关系的数学模型。 相似文献
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彩色屏幕地图是以R、G、B色空间表示,彩色印刷地图是以Y、M、C、BK油墨色空间表示的。因此彩色屏幕地图成为印品必须经过色空间的转换。黑版的确定是色空间转换的难点,文中论述了是在Neugebauer三色转换方程的基础上,经过大量实验获得的一种黑版确定的方法。 相似文献
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彩色屏幕地图是以R、G、B色空间表示,彩色印刷地图是以Y、M、C、BK油墨色空间表示的.因此彩色屏幕地图输出成为印品必须经过色空间的转换.黑版的确定是色空间转换的难点.文中论述的是在Neugebauer三色转换方程的基础上,经过大量实验获得的一种黑版确定的方法. 相似文献
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彩色地图图像数据库是GIS的空间定位信息。本文对建立彩色地图图像数据库的基础算法进行了研究,在此基础上提出了一种最优的方法。该方法具有处理速度快,精度高,通用性强,编程简单等特点。该方法已用于实际彩色地图图像数据库的建立,并取得了较好的效果,适用于任何比例尺地图数据库的建立。 相似文献
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地图内容的转换,实质上就是不同资料图投影与新编图投影之间的转换。这是因为地图投影是地图编绘的数学基础,没有了投影这一数学基础,地图的编绘也就失去了其存在的意义。整幅或局部地图从一种制图投影到另一制图投影的几何改正变换是一个老问题。 相似文献
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ArcGIS数据与Corel Draw数据的转换方法研究 总被引:1,自引:0,他引:1
在地图生产制作过程中,地图制作软件的数据共享至关重要。传统的地图生产中没有明确提出ArcGIS和CorelDraw软件的转换方法,本文在总结了以往地图制作软件之间数据共享方法的基础上,重点阐述了ArcGIS与CorelDraw的数据之间转换的实现过程与方法,详细分析了两者数据特点和数据转换过程中要注意的问题,最后总结了CorelDraw与ArcGIS软件间数据转换仍然存在的不足,从而达到地图数据资源的共享。 相似文献
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Ndr Krishna A K Maji YVN Krishna Murthy BSP Rao 《Journal of the Indian Society of Remote Sensing》2001,29(3):107-113
Availability of remote sensing data from earth observation satellites has made it convenient to map and monitor land use/land cover at regional to local scales. A land cover map is very critical for a various planning activities including watershed planning. The spectral and spatial resolutions are major constraints for mapping the crop resources at microlevel. The cropping pattern zones have been mapped using the false color composite, physiography, irrigation and toposheets. The IRS LISS-III data is classified into various categories depending on spectral reflectance from crop canopy and are overlaid on cropping zones map. The re-classified resultant map provides land use/land cover information including dominant cropping systems. The canopy cover is estimated monthly considering the crop calendar for the area. 相似文献
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Surface samples (Ap horizon) of twenty one soils widely differing in their physical appearance of colour were collected from different parts of India. Air-dried soils, passed through 2 mm sieve, were packed in black round trays for reflectance measurements. Soil colour of air-dry soils was designated using Munsell colour charts. Spectral reflectance patterns were obtained by a portable spectroradiometer using sunlight as the illuminant. For each sample, the XYZ tristimulus values; x,y chromaticity coordinates were obtained from reflectance patterns using the CIE standard methods. Munsell. notations were also converted to tristimulus and chromaticity coordinates using published tables of Wyszecki and Stiles (1982). The RGB colour coordinates obtained from both the systems were compared. The RGB values from spectral data were well correlated with reflectance in TM bands, while those from Munsell notation were correlated to a lesser extent. The tristimulus values were used to designate each soil with specific set of values to locate them in Universal Colour Space. 相似文献
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本文通过对地图颜色视觉感受的分析,从色度学理论出发,提出了用色差定量表示地图颜色视觉感受的方法,并讨论了色差值的大小。 相似文献
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《制图学和地理信息科学》2013,40(4):203-220
Cartographers have long discouraged the use of spectral, or rainbow, color schemes on thematic maps of quantitative geographic data, though such color use is common in GIS and scientific visualization. Recent research, however, has shown that spectral schemes are preferred and are interpreted accurately when used as multi-hue renditions of diverging schemes. Both spectral and diverging schemes can emphasize a critical point within a data range with light colors and emphasize both high and low extremes of the data with dark colors. Although spectral schemes include multiple saturated hues, they can be designed to accommodate map reading by people with red-green impaired color vision by skipping over the yellow-greens in the spectral sequence. Cartographers should encourage use of spectral color schemes for depicting diverging quantitative data, rather than insisting that these schemes should not be used. 相似文献