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1.发明授权Method of correcting the measured reflectance of an image acquired by an image acquisition device for the integrating cavity effect 失效校正由图像获取装置获取的用于积分腔效应的图像的测量反射率的方法
公开(公告)号：US5790281A
公开(公告)日：1998-08-04
申请号：US720653
申请日：1996-10-02
申请人： Keith T. Knox , Brian L. Waldron
发明人： Keith T. Knox , Brian L. Waldron
CPC分类号： H04N1/4076
摘要： This invention discloses a method of correcting the measurement of the amount of light reflected by a document that is being processed by a digital image acquisition apparatus. A typical image acquisition apparatus measures the amount of light reflected from the surface of the original document and sets a corresponding set of electrical signals to a printing or storage module. Image acquisition usually requires illuminating the original document with a reflecting cavity, which causes the measurement of the amount of light present on the surface of the document to become distorted. The method disclosed by the present invention corrects this phenomenon by calculating the amount of light that reaches the surface of the original document by being reflected from the illumination system and the surrounding cavity. This allows the measured reflectance to be corrected, and the true reflectance to be used for subsequent output or storage.
摘要翻译： 本发明公开了一种校正由数字图像采集装置正在处理的文件反射的光量的测量的方法。 典型的图像采集装置测量从原始文件的表面反射的光量，并将相应的一组电信号设置到打印或存储模块。 图像采集通常需要用反射腔照射原稿，这样可以测量文件表面上存在的光量变形。 本发明公开的方法通过计算通过从照明系统和周围空腔反射到达原稿的表面的光量来校正这种现象。 这允许校正测量的反射率，并且将真实的反射率用于随后的输出或存储。
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公开(公告)号：US06483606B1
公开(公告)日：2002-11-19
申请号：US09140219
申请日：1998-08-26
IPC分类号： G06K1500
CPC分类号： H04N1/52
摘要： A method of error diffusion selects colorants, from a plurality of colorants defining a color space, to obtain an actual color which represents a desired color for respective pixels. The actual colors are output by an output apparatus. The process first determines the desired color for a pixel. Next, undercolor removal is performed for the desired color, thereby dividing the desired color into first and second components. A scalar error diffusion is then performed for the first component of the desired color, resulting in a first component of the actual color. A vector error diffusion is performed for the second component of the desired color. The vector error diffusion calculates an error as a negative of a distance in the color space between a closest available colorant in a subset of the plurality of colorants and the desired color. The error is added to the desired color to obtain a second component of the actual color. The first and second components of the actual color are combined to achieve the final actual color. The final actual color is output to a color output apparatus.
摘要翻译： 误差扩散的方法从多个定义颜色空间的着色剂中选择着色剂，以获得表示各个像素的期望颜色的实际颜色。 实际颜色由输出装置输出。 该过程首先确定像素所需的颜色。 接下来，对期望的颜色执行底色去除，从而将期望的颜色分成第一和第二组分。 然后对所需颜色的第一分量执行标量误差扩散，得到实际颜色的第一分量。 对所需颜色的第二分量执行向量误差扩散。 矢量误差扩散将误差计算为多个着色剂的子集中的最接近的可用着色剂和所需颜色之间的颜色空间中的距离的负值。 该错误被添加到所需的颜色以获得实际颜色的第二分量。 实际颜色的第一和第二组分被组合以实现最终的实际颜色。 最终的实际颜色被输出到彩色输出装置。
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3.发明授权Error diffusion in color printing where an intra-gamut colorant is available 失效彩色印刷中的错误扩散，其中色域内着色剂可用
公开(公告)号：US5982992A
公开(公告)日：1999-11-09
申请号：US924734
申请日：1997-09-05
申请人： Brian L. Waldron
发明人： Brian L. Waldron
CPC分类号： H04N1/52
摘要： In a digital printing apparatus in which primary colorants are selected by an error-diffusion process, a method takes into account situations in which a colorant is selectable from within the gamut defined by certain other primary colorants. In the case of a printer in which, in addition to CMYK colorants, a mid-gray colorant is also selectable, the method avoids the problem in which an error-diffusion algorithm mandates the simulation of colors outside the gamut.
摘要翻译： 在通过误差扩散处理选择原色剂的数字打印装置中，一种方法考虑了其中着色剂可以在由某些其它原色料定义的色域内选择的情况。 在打印机的情况下，除了CMYK着色剂之外，还可以选择中灰色着色剂，该方法避免了误差扩散算法强制对色域外的颜色的模拟的问题。
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公开(公告)号：US4661859A
公开(公告)日：1987-04-28
申请号：US270079
申请日：1981-06-03
CPC分类号： H04N1/4056 , H04N1/4078
摘要： A one dimensional electronic halftone generating system having a source of digital data representative of pixel greyscale, a counter to store the digital data, and pulse producing logic responsive to the counter to activate a laser modulator in accordance with the digital data representative of each pixel. In particular, a six bit data word represents one of 64 greyscale states for a particular pixel. The pulse producing logic responds to the particular data word to produce a pulse of a given duration or width to drive the laser for a given time period. The duration of the pulse, representing one to 64 states for a given pixel, will produce a given discrete greyscale value for each pixel.
摘要翻译： 具有表示像素灰度的数字数据源的一维电子半色调产生系统，用于存储数字数据的计数器以及响应于计数器的脉冲产生逻辑，以根据表示每个像素的数字数据激活激光调制器。 特别地，六位数据字表示特定像素的64个灰度状态之一。 脉冲产生逻辑响应于特定数据字以产生给定持续时间或宽度的脉冲以驱动激光器给定的时间段。 对于给定像素，脉冲的持续时间表示一到64个状态，将为每个像素产生给定的离散灰度值。
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公开(公告)号：US5450502A
公开(公告)日：1995-09-12
申请号：US133231
申请日：1993-10-07
CPC分类号： G06T5/40 , G06T5/007 , G06T2207/10024 , G06T2207/10152 , G06T2207/20021
摘要： A method of improving the contrast in a natural scene image, in which the image is converted from an original set of color coordinates to an expression where one term has a relationship to overall image intensity. A global histogram of the image is derived for that term, which plots the populations of pixels at each possible level of intensity in the image. The signal describing the histogram is operated on with a filter having the characteristic of weakening strong peaks and valleys in the function, but not effecting flat portions of the signal. The filtered histogram signal is used for controlling the TRC mapping in a device at which the image is to be printed. Contrast is improved in areas likely to have the most image information, using the method described above, and further, dividing the image into a number of segments, each describable by a local histogram signal for that image segment. Each local histogram signal is compared to the global histogram, to determine which signals are flatter. If any of the local histograms have signals flatter than the global histogram, the signals are summed into a relevant histogram signal and directed to the flattening filter in its place.
摘要翻译： 一种改善自然场景图像中的对比度的方法，其中图像从原始颜色坐标组转换成一个项与整体图像强度有关系的表达式。 导出该图像的全局直方图，其绘制图像中每个可能的强度级别的像素群。 描述直方图的信号用具有削弱功能中强峰和谷的特性的滤波器进行操作，但不影响信号的平坦部分。 滤波后的直方图信号用于控制要打印图像的设备中的TRC映射。 使用上述方法可以获得最多图像信息的区域的对比度得到改善，并且进一步将图像划分成多个片段，每个片段可由该图像片段的局部直方图信号描述。 将每个局部直方图信号与全局直方图进行比较，以确定哪些信号更平坦。 如果任何本地直方图具有比全局直方图更平坦的信号，则将信号求和到相关的直方图信号中，并将其指向其位置的平坦化滤波器。
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