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1.发明授权Sequential scalar quantization of digital color image using mean squared error-minimizing quantizer density function 失效使用均方误差最小化量化器密度函数对数字彩色图像进行顺序量化
公开(公告)号：US5432893A
公开(公告)日：1995-07-11
申请号：US58930
申请日：1993-05-07
CPC分类号： H04N1/644
摘要： A digital color image quantization mechanism employs sequential product code vector quantization, to sequentially extract chrominance and luminance values from the vectors and quantizes chrominance and luminance features in accordance with an asymptotically optimal quantizer density function of the color space histogram along respective chrominance and luminance axes into a plurality of luminance-chrominance sub-regions or color space cells, such that each partitioned color cell is associated with a color of the output palette through which the color composition of a reproduced color image is defined. A map of chrominance and luminance output codes is generated for the respective pixels of the output color image in accordance with the axial splitting or quantization of the chrominance and luminance components of the histogram. The resulting map of chrominance and luminance output codes of the output digital color image is then transformed into sets of RGB output color codes for application to respective RGB digital-to-analog converters that drive a color image reproduction device.
摘要翻译： 数字彩色图像量化机构采用顺序乘积码矢量量化，从矢量中依次提取色度和亮度值，并根据颜色空间直方图沿相应色度和亮度轴的渐近最佳量化器密度函数量化色度和亮度特征， 多个亮度色度子区域或颜色空间单元，使得每个划分的颜色单元与所述输出调色板的颜色相关联，通过该颜色定义再现的彩色图像的颜色组成。 根据直方图的色度和亮度分量的轴向分割或量化，为输出彩色图像的各个像素生成色度和亮度输出代码的映射。 然后将所得到的输出数字彩色图像的色度和亮度输出代码映射变换成RGB输出颜色代码，以应用于驱动彩色图像再现装置的各个RGB数模转换器。
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2.发明授权Image rendering system and method for generating stochastic threshold arrays for use therewith 失效用于产生随机阈值阵列的图像渲染系统和方法
公开(公告)号：US5745660A
公开(公告)日：1998-04-28
申请号：US427880
申请日：1995-04-26
CPC分类号： H04N1/4051
摘要： An image rendering system, for generating discrete tone image data representing a continuous-tone image for rendering by a rendering device, the image rendering system includes a stochastic threshold array generating arrangement and an image data processing section. The stochastic threshold array generating arrangement generates a plurality of stochastic threshold arrays from a random seed pattern that have been subsequently optimized to reduce image artifacts in the rendering of tones. Each pattern is optimized to reflect (i) a selected trade-off between grain and possible mottle in the rendered image, (ii) distortions introduced by the rendering device in rendering an image defined by the pattern and an observer in viewing the image, and (iii) boundary effects so that the patterns, when tiled together, have optimal visual characteristics proximate their respective edges. The image data processing section processes the continuous tone image data in relation to the stochastic threshold arrays generated by the stochastic threshold array generating arrangement. The image data processing section may be used to either randomly tile, or tile in an ordered way, the stochastic threshold arrays over the continuous-tone image data and generates the discrete tone image data in response to correspondingly positioned pixels of the continuous-tone image data and threshold values of the stochastic threshold arrays.
摘要翻译： 一种图像再现系统，用于生成表示由渲染装置呈现的连续色调图像的离散色调图像数据，所述图像渲染系统包括随机阈值阵列产生装置和图像数据处理部分。 随机阈值阵列产生装置从随机优化的随机种子模式生成多个随机阈值阵列，以减少色调呈现中的图像伪影。 每个图案被优化以反映（i）在渲染图像中的纹理和可能斑点之间的选择权衡，（ii）渲染设备在渲染由图案定义的图像和观察者观看图像时引入的失真，以及 （iii）边界效应，使得当平铺在一起时，图案在它们各自的边缘附近具有最佳视觉特征。 图像数据处理部分针对由随机阈值阵列产生装置产生的随机阈值阵列处理连续色调图像数据。 图像数据处理部分可以用于随机地平铺或以有序的方式平铺连续色调图像数据上的随机阈值阵列，并且响应于连续色调图像的相应定位的像素生成离散色调图像数据 随机阈值阵列的数据和阈值。
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3.发明授权Image-dependent color saturation correction in a natural scene pictorial image 失效自然场景图像中的图像相关色彩饱和度校正
公开(公告)号：US5450217A
公开(公告)日：1995-09-12
申请号：US247367
申请日：1994-05-23
CPC分类号： H04N1/6027
摘要： A method and apparatus for image-dependent color saturation correction in natural scene images in electronic documents is provided, wherein an input image is converted from its original color space definition to a luminance-hue-saturation color space, such as HSV space, where S has a strong correlation to perceived saturation. That saturation component of the signal is averaged over the image for at least a region of its input value range corresponding to brightness, and the determined average is compared to a threshold selected to represent desirable saturation level. If saturation is less than target saturation, a filtering function is selected, operable on the image to enhance saturation as a function of the average saturation and desired saturations. Otherwise, no change is made to the image. Since altering saturation of an image in HSV space will tend to alter luminance of the image, subsequent to filtering the image to enhance saturation, the image is refiltered to reduce luminance as a function of the original luminance and the luminance of the saturation-enhanced image.
摘要翻译： 提供了一种用于电子文档中的自然场景图像中用于图像相关色彩饱和度校正的方法和装置，其中输入图像从其原始颜色空间定义被转换为诸如HSV空间的亮度色相饱和度颜色空间，其中S 与感知饱和度有很强的相关性。 该信号的饱和分量对于其对应于亮度的其输入值范围的至少一个区域在该图像上进行平均，并将所确定的平均值与选择为表示所需饱和水平的阈值进行比较。 如果饱和度小于目标饱和度，则选择滤波功能，可在图像上运行，以增强饱和度，作为平均饱和度和所需饱和度的函数。 否则，图像不会改变。 由于在HSV空间中的图像的改变饱和度将倾向于改变图像的亮度，在对图像进行滤波以增强饱和度之后，图像被重新滤波以根据原始亮度和饱和度增强图像的亮度来降低亮度 。
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