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公开(公告)号：US5905820A
公开(公告)日：1999-05-18
申请号：US809984
申请日：1991-12-18
CPC分类号： G06T5/009 , G06T3/4023 , G06T7/0081 , G06T2207/20148
摘要： A method and apparatus for enhancing an image for a display, first digitizes the image to produce a map of the image, this map containing pixels having 2.sup.n grey levels where n is the number of bits per pixel. The map of the image is then downsampled to produce a downsampled map of the image. Thresholding is then performed on the downsampled map of the image to reduce the number of bits per pixel from n bits to m bits to produce a thresholded downsampled map of the image, where m is less than n. The number of bits per pixel is restored from m bits to p bits, where p is greater than m, to produce a restored thresholded downsampled map of the image. The restored thresholded downsampled map of the image can be downsampled again to produce an image map suitable for display on a low to moderate cost display, such as a CRT, with grey scale capability. The displayed image has an enhanced appearance, since it is high fidelity with respect to the original.
摘要翻译： 一种用于增强显示图像的方法和装置，首先数字化图像以产生图像的地图，该地图包含具有2n个灰度级的像素，其中n是每像素的位数。 然后对图像的地图进行下采样以产生图像的下采样图。 然后对图像的下采样图进行阈值处理，以将每像素的位数从n位减少到m位，以产生图像的阈值下采样图，其中m小于n。 每像素的位数从m位恢复到p位，其中p大于m，以产生图像的恢复的阈值下采样图。 图像的恢复阈值下采样图可以被再次下采样，以产生适合于在具有灰度级能力的低成本显示器（例如CRT）上显示的图像映射。 显示的图像具有增强的外观，因为它相对于原稿具有高保真度。
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2.发明授权High speed digital error diffusion process for continuous tone image-to-binary image conversion 失效连续图像到二进制图像转换的高速数字误差扩展过程
公开(公告)号：US5172247A
公开(公告)日：1992-12-15
申请号：US602563
申请日：1990-10-24
申请人： Mohsen Ghaderi
发明人： Mohsen Ghaderi
CPC分类号： H04N1/4053
摘要： The invention is a high speed error diffusion process consisting of repetitive computational cycles in which a binary print value is determined from an error-diffused pixel in a continuous tone image. In each cycle, the computation of the previous pixel error exploits computations made during the previous cycle. Specifically, for a continuous tone image consisting of n-bit pixels, the n least significant bits of the previous pixel error are computed during the previous cycle and its sign bit is determined during the current cycle. The n least significant bits of the previous pixel error are the n least significant bits of the error-diffused pixel of the previous cycle. The sign bit of the previous pixel error is determined during the current cycle from the three most significant bits of the error-diffused pixel value of the previous cycle and from the binary print value of the previous cycle.
摘要翻译： 本发明是由连续色调图像中的误差扩散像素确定二进制打印值的重复计算周期组成的高速误差扩散处理。 在每个周期中，先前像素误差的计算利用前一周期中的计算。 具体来说，对于由n位像素构成的连续色调图像，在前一周期中计算先前像素误差的n个最低有效位，并且在当前周期内确定其符号位。 先前像素误差的n个最低有效位是前一周期的误差扩散像素的n个最低有效位。 前一个像素误差的符号位在当前周期内从上一个周期的误差扩散像素值的三个最高有效位以及前一个周期的二进制打印值中确定。
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公开(公告)号：US5438633A
公开(公告)日：1995-08-01
申请号：US28449
申请日：1993-03-09
申请人： Mohsen Ghaderi
发明人： Mohsen Ghaderi
摘要： An adaptive quantizer for digital image processing eliminates the influence of non-information anomalies, such as scratches, dust, etc. that may be present in an image in the course of determining the minimum and maximum signal levels LCHAR and HCHAR, respectively, and more accurately updates respective estimated image information level PREV.sub.-- HCHAR that effectively prevents discontinuities or `jumps` during line-by-line adjustment, thereby effectively obviating the problem of potential corruption of a local mean window and taking into account how `noisy` the background is.
摘要翻译： 用于数字图像处理的自适应量化器消除了在分别确定最小和最大信号电平LCHAR和HCHAR的过程中可能存在于图像中的非信息异常（例如划痕，灰尘等）的影响，以及更多 准确地更新在逐行调整期间有效地防止不连续性或“跳跃”的各个估计图像信息水平PREV-HCHAR，从而有效地消除了局部平均窗口潜在腐败的问题，并考虑到背景是如何“嘈杂” 。
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公开(公告)号：US5481628A
公开(公告)日：1996-01-02
申请号：US28474
申请日：1993-03-09
申请人： Mohsen Ghaderi
发明人： Mohsen Ghaderi
CPC分类号： G06T5/20
摘要： An adaptive spatial filter for digital image processing selectively performs spatial high pass filtering of an input digital signal to produce an output pixel value having an enhanced signal level using a gain factor that effects a variable degree of enhancement of the input pixel, so that pixels whose activity values are close to an iteratively adjustable activity threshold level will be emphasized significantly less than pixels whose associated activity values are substantially above the threshold level. The activity threshold level is selectively updated at the end of a scan line in accordance with prescribed spatial activity criteria, so as to effectively prevent discontinuities in the threshold level during line-by-line adjustment and to take into account how `noisy` the background is. Potential corruption of the updated value of a pixel by an edge portion of the image is avoided by requiring that pixels which are associated with background or signal regions of the image be respectively less than or greater than a local mean value. Otherwise the pixel values are not modified.
摘要翻译： 用于数字图像处理的自适应空间滤波器选择性地执行输入数字信号的空间高通滤波，以使用增益因子产生具有增强信号电平的输出像素值，所述增益因子影响输入像素的可变程度的增强，使得其 活动值接近于可重复调整的活动阈值水平将显着小于其相关活动值大大高于阈值水平的像素。 根据规定的空间活动标准，在扫描线的末端选择性地更新活动阈值水平，以便在逐行调整期间有效地防止阈值水平的不连续性，并考虑到背景如何“嘈杂” 是的 通过要求与图像的背景或信号区域相关联的像素分别小于或大于局部平均值来避免由图像的边缘部分更新的像素值的潜在损坏。 否则像素值不会被修改。
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