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1.发明授权
公开(公告)号：US5363213A
公开(公告)日：1994-11-08
申请号：US895063
申请日：1992-06-08
申请人： Robert E. Coward , James D. Parker
发明人： Robert E. Coward , James D. Parker
CPC分类号： G06T3/4023
摘要： In a method for converting from a first bitmap image resolution to a second bitmap resolution, be it interpolation (an increase in resolution) or decimation (a decrease in resolution) a bitmap image defined at resolution and density I.times.J.times.a is prefiltered as a first step to ensure the preservation of original image structure and compensate for device dependence of the input image, which is necessary in order to maintain the quality and sharpness of the original image. The filter may be selected from a variety of filter choices and may also perform pixel interpolation or decimation depending on the input source. As a second step, unquantized scaling of a prefiltered image (K.times.L.times.b) is performed using an f.times.g pixel window to identify a set of neighboring input pixels surrounding a single output pixel. The window contributes input pixel density information to generate a scaled gray output pixel. Each pixel in the window is assigned a weighting factor to establish a density contribution to the output pixel. As a third step, each pixel in the gray scale image (M.times.N.times.c) is quantized to a desired depth using error diffusion or other quantizing methods. The gray scale image is converted from an image defined at c levels to an output image defined at d levels where each of the d levels can be reproduced by a selected output device.
摘要翻译： 在从第一位图图像分辨率转换为第二位图分辨率的方法中，无论是以分辨率定义的位图图像的内插（分辨率的增加）还是抽取（分辨率的降低），并将密度IxJxa作为第一步骤进行过滤 确保保留原始图像结构并补偿输入图像的设备依赖性，这是为了保持原始图像的质量和清晰度所必需的。 滤波器可以从各种滤波器选择中选择，并且还可以根据输入源执行像素内插或抽取。 作为第二步，使用fxg像素窗口来执行预滤波图像（KxLxb）的未量化缩放以识别围绕单个输出像素的一组相邻输入像素。 该窗口提供输入像素密度信息以生成缩放的灰度输出像素。 为窗口中的每个像素分配加权因子以建立对输出像素的密度贡献。 作为第三步骤，使用误差扩散或其他量化方法将灰度图像（MxNxc）中的每个像素量化到期望的深度。 将灰度图像从在c级定义的图像转换为在d级定义的输出图像，其中每个d级别可以由选择的输出设备再现。
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公开(公告)号：US5528704A
公开(公告)日：1996-06-18
申请号：US333083
申请日：1994-10-31
申请人： James D. Parker , Robert E. Coward
发明人： James D. Parker , Robert E. Coward
CPC分类号： G06T3/4069 , H04N1/40068
摘要： An image processing apparatus in a reproduction system includes an image input terminal having a device resolution of K pixels per unit length by L pixels per unit length (K x L). Each pixel is defined at a depth b representing one of b optical densities. The image input terminal emits an input image at the device resolution and depth (KxLxb). A memory is provided for receiving and storing as electrical signals the input image emitted from the image input terminal. A first processing means converts the resolution of the input image to a plurality of output images at a second resolution of M pixels per unit length by N pixels per unit length (M x N). Each pixel is defined at depth d representing one of d optical densities. The first processing means converts the input image to the plurality of output images by spatially offsetting a periodically repeating mapping defining the conversion between the input image and the output image. A second processing means forms a distribution of the plurality of output images. The second processing means selects a composite output image from the distribution of output images and stores the composite output image in the memory. An image output terminal having a device resolution and depth of M x N x d, is adapted for reproducing the composite image stored in the memory.
摘要翻译： 再现系统中的图像处理装置包括具有每单位长度K个像素的设备分辨率乘以每单位长度L个像素（K×L）的图像输入端子。 每个像素被定义在表示b个光密度之一的深度b处。 图像输入端以设备分辨率和深度（KxLxb）发射输入图像。 提供存储器，用于接收和存储从图像输入端子发射的输入图像作为电信号。 第一处理装置以每单位长度M个像素的每秒单位长度N个像素（M×N）的第二分辨率将输入图像的分辨率转换为多个输出图像。 每个像素被定义在表示d个光密度之一的深度d处。 第一处理装置通过空间偏移定义输入图像和输出图像之间的转换的周期性重复映射将输入图像转换成多个输出图像。 第二处理装置形成多个输出图像的分布。 第二处理装置从输出图像的分布中选择合成输出图像，并将复合输出图像存储在存储器中。 具有设备分辨率和深度M×N×d的图像输出端适于再现存储在存储器中的合成图像。
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公开(公告)号：US5301037A
公开(公告)日：1994-04-05
申请号：US981678
申请日：1992-11-25
申请人： Henry R. Kang , Robert E. Coward
发明人： Henry R. Kang , Robert E. Coward
CPC分类号： G06T3/4023 , G06K15/00 , H04N1/40068
摘要： A method for converting a set of input image pixels having a first resolution and being represented by a set of input image signals to a set of output image pixels having a second resolution and being represented by a set of output image signals. The method is adapted for use in an electroreprographic machine having a memory for storing images and an image output terminal for printing the images. The method comprises the following steps: first, developing a set of state determination rules which govern the conversion of the set of input image pixels having the first resolution to the set of output image pixels having the second resolution; second, communicating the set of input image signals and the set output image signals to the memory, third, relating a plurality of selected input image pixels with a selected one of the output image pixels; fourth, determining respective binary states of the plurality of selected input image pixels; finally, corresponding the selected output image pixel with one of at least three output states by reference to the determined, respective binary states and one of the state determination rules.
摘要翻译： 一种用于将具有第一分辨率的一组输入图像像素并由一组输入图像信号转换成具有第二分辨率并由一组输出图像信号表示的输出图像像素的集合的方法。 该方法适用于具有用于存储图像的存储器和用于打印图像的图像输出端子的电加工机。 该方法包括以下步骤：首先，开发一组状态确定规则，其将具有第一分辨率的输入图像像素组的转换控制为具有第二分辨率的输出图像像素的集合; 第二，将所述输入图像信号和所设置的输出图像信号传送到所述存储器;第三，将多个所选输入图像像素与所选输出图像像素中的一个相关联; 第四，确定多个所选择的输入图像像素的各个二进制状态; 最后，通过参考所确定的各自的二进制状态和状态确定规则之一，将所选择的输出图像像素与至少三个输出状态中的一个对应。
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公开(公告)号：US5282057A
公开(公告)日：1994-01-25
申请号：US513415
申请日：1990-04-23
CPC分类号： H04N1/40068 , G06K15/1223 , G06K15/128 , G06T3/4007 , G06T3/403 , G06K2215/0057
摘要： A method for converting binary image data originally generated at a lower resolution into representative binary image data of a higher resolution, wherein the conversion ratio, or magnification factor, is an integer value. Also included are methods for smoothing the interpolated output image and thereby reducing objectionable visual characteristics observable in digitally encoded data using conventional magnification techniques.
摘要翻译： 一种用于将原始以较低分辨率生成的二进制图像数据转换为更高分辨率的代表性二进制图像数据的方法，其中转换比率或放大系数是整数值。 还包括用于平滑内插输出图像的方法，从而减少使用常规放大技术在数字编码数据中可观察到的令人反感的视觉特征。
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