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1. 发明授权

EP0441608B1 Photographic image reproduction using digital halftoning 失效
标题翻译：使用数字半色调的照片图像再现
公开(公告)号：EP0441608B1
公开(公告)日：1995-04-19
申请号：EP91300963.5
申请日：1991-02-06
申请人： Levien, Raphael L.
发明人： Levien, Raphael L.
IPC分类号： H04N1/387
CPC分类号： H04N1/4057

2. 发明公开

EP0540169A1 Screen generation for halftone screening of images 失效
标题翻译：屏幕生成半色调图像的筛选
公开(公告)号：EP0540169A1
公开(公告)日：1993-05-05
申请号：EP92308796.9
申请日：1992-09-25
申请人： Levien, Raphael L.
发明人： Levien, Raphael L.
IPC分类号： H04N1/40
CPC分类号： H04N1/4058
摘要： A halftone screen pattern generation system for computing halftone screened images with rotated screens including multiple angle and ruling combinations, including irrational tangent angles, is disclosed. A screen pattern is generated by storing an oversized strip from an ideal angled screen pattern, and then assembling a sequence comprising selected scan line segments of the oversized strip. Each selected scan line segment corresponds to one of a plurality of offsets of the oversized strip. The error between the actual generated screen and ideal desired screen is computed. Each subsequent scan line segment is selected from the plurality of scan line segments corresponding to the plurality of offsets so as to minimize the accumulated error. In one embodiment, the measure of error between the actual generated screen and the ideal angled screen is the length of a vector in a transformed UV space between the actual screen sample point and the ideal screen sample point. The error is determined by vector addition of the accumulated error, from scan line to scan line, which is added to the present error contribution from the offset of the present scan line.
摘要翻译：公开了一种半色调网屏图案生成系统，用于利用旋转屏幕来计算半色调网屏图像，该屏幕包括包含无理切线角度的多角度和规则组合。通过存储来自理想角度屏幕图案的超大化条带，然后组装包括超大化条带的选定扫描线段的序列来生成屏幕图案。每个选定的扫描线段对应于超大尺寸带的多个偏移中的一个。计算实际生成的屏幕和理想的期望屏幕之间的误差。从对应于多个偏移的多个扫描线段中选择每个随后的扫描线段，以使累积的误差最小化。在一个实施例中，实际生成的屏幕与理想的成角度屏幕之间的误差度量是实际屏幕采样点与理想屏幕采样点之间的经变换的UV空间中的矢量的长度。该误差由从扫描线到扫描线的累加误差的矢量相加确定，该累加误差被添加到当前扫描线的偏移量的当前误差贡献中。

3. 发明公开

EP0514080A2 Transition signalling data communications 失效
标题翻译：过渡信令数据通信
公开(公告)号：EP0514080A2
公开(公告)日：1992-11-19
申请号：EP92304102.4
申请日：1992-05-07
申请人： Levien, Raphael L.
发明人： Levien, Raphael L.
IPC分类号： G06F13/42
CPC分类号： G06F13/368
摘要： A transition signalling communication system suitable for use in a high speed data communication bus between a bus master (12) and two or more peripheral slave devices (14) provides data transfer rates up to twice the maximum clock frequency. The bus architecture permits transition signalling to be used with a plurality of slave devices with tri-state or open collector control signals. The bus master (12) includes a first control signal (REQ), which initiates a data transfer request by the transition of said first control signal, and a second control signal (REQINVALID) which provides an indication whether said first control signal transition is valid. In response, the slave includes a third control signal (ACK) which acknowledges the first control signal by the transition of said third control, and fourth control signal (ACKINVALID) which provides an indication whether the third control signal transition is valid.
摘要翻译：适用于总线主控器（12）和两个或更多外围从设备（14）之间的高速数据通信总线中的转换信令通信系统提供高达最大时钟频率两倍的数据传输速率。总线架构允许转换信令与具有三态或集电极开路控制信号的多个从设备一起使用。总线主控器（12）包括通过所述第一控制信号的转变启动数据传输请求的第一控制信号（REQ）和提供所述第一控制信号转换是否有效的指示的第二控制信号（REQINVALID）。作为响应，从设备包括通过所述第三控制的转换来确认第一控制信号的第三控制信号（ACK），以及提供第三控制信号转换是否有效的指示的第四控制信号（ACKINVALID）。

4. 发明授权

EP0514080B1 Transition signalling data communications 失效
标题翻译：过渡信令数据通信
公开(公告)号：EP0514080B1
公开(公告)日：1999-12-01
申请号：EP92304102.4
申请日：1992-05-07
申请人： Levien, Raphael L.
发明人： Levien, Raphael L.
IPC分类号： G06F13/42
CPC分类号： G06F13/368

5. 发明授权

EP0549326B1 Method and apparatus for halftoning of images 失效
标题翻译：对于图像的半色调网屏的方法和装置
公开(公告)号：EP0549326B1
公开(公告)日：1999-02-24
申请号：EP92311697.4
申请日：1992-12-22
申请人： Levien, Raphael L.
发明人： Levien, Raphael L.
IPC分类号： H04N1/40 , H04N1/405
CPC分类号： H04N1/4058

6. 发明授权

EP0534720B1 Register marks 失效
标题翻译：对准
公开(公告)号：EP0534720B1
公开(公告)日：1998-05-27
申请号：EP92308632.6
申请日：1992-09-23
申请人： Levien, Raphael L.
发明人： Levien, Raphael L.
IPC分类号： G03F9/00
CPC分类号： G03F7/70633 , G03F9/00 , G03F9/70

7. 发明授权

EP0441609B1 Color correction for photographic reproduction 失效
标题翻译：用于照相复制色彩校正
公开(公告)号：EP0441609B1
公开(公告)日：1996-04-10
申请号：EP91300964.3
申请日：1991-02-06
申请人： Levien, Raphael L.
发明人： Levien, Raphael L.
IPC分类号： H04N1/46 , H04N1/40
CPC分类号： H04N1/4072 , H04N1/6011 , H04N1/6027

8. 发明公开

EP0529965A3 High speed screening of images 失效
标题翻译：高速图像的筛选
公开(公告)号：EP0529965A3
公开(公告)日：1993-12-08
申请号：EP92307652.5
申请日：1992-08-21
申请人： Levien, Raphael L.
发明人： Levien, Raphael L.
IPC分类号： G06F15/62 , H04N1/40
CPC分类号： H04N1/4055
摘要： A high speed screening technique is embodied in a method and apparatus that can be used to enlarge an image, or when combined with a halftone screen, can be used for high speed screening of stored images. A microcompiler (32) generates customized program code (38) responsive to an input enlargement ratio. The customized program code (38) then performs halftone screening on the input image (34) for the specified desired enlargement ratio (30). In general, for each different enlargement ratio, a different customized program code is generated. Thus, a parameter of the screening process, the enlargement ratio (30), which is an input to the microcompiler (32), is not an input during the run time of the customized program code, thereby permitting the customized program code to run faster since an input parameter has been removed and built into the code itself. A routine for generating the customized program code is described and specific programs are given.

9. 发明公开

EP0441608A3 Photographic image reproduction using digital halftoning 失效
标题翻译：摄影图像复制使用数字化
公开(公告)号：EP0441608A3
公开(公告)日：1992-11-25
申请号：EP91300963.5
申请日：1991-02-06
申请人： Levien, Raphael L.
发明人： Levien, Raphael L.
IPC分类号： H04N1/387
CPC分类号： H04N1/4057
摘要： In the generation of screened halftones of photographic images for low resolution marking devices, conventional screen techniques are too coarse, and adaptive dither techniques are too fine. The present invention preserves the advantages of the adaptive dither techniques, while creating screen patterns with an adjustable degree of coarseness. The invention applies a hysteresis constant and recursion techniques previously limited to adaptive screening with fixed dot patterns to vary the size of dots in the screened image, thereby allowing adjustment of the image coarseness by adjusting the hysteresis constant.

10. 发明公开

EP0549326A1 Method and apparatus for halftoning of images 失效
标题翻译： Verfahren und Vorrichtung zur Halbtonrasterung von Bildern。
公开(公告)号：EP0549326A1
公开(公告)日：1993-06-30
申请号：EP92311697.4
申请日：1992-12-22
申请人： Levien, Raphael L.
发明人： Levien, Raphael L.
IPC分类号： H04N1/40
CPC分类号： H04N1/4058
摘要： Internal moire artifacts found in digital halftoning of photographic images are diffused by rearranging the order of grayscale levels in an original screen pattern cell to generate a new screen pattern cell having a different grayscale order of stored screen pattern pixels. The grayscale order of the original cell is modified by the addition of a bump function (216) at each point in the original cell (206) in order of grayscale (212). The new grayscale order is stored (214) in the new cell. Adding the bump function (216) at the chosen point in the original cell (206) influences the choice of the next pixel in the grayscale so that the grayscale order in the new cell is, in general, somewhat different from the grayscale order in the original cell. Errors caused by internal moire effects are thus both diffused in the grayscale dimension, and also diffused isotropically in the spatial dimension. The effect of rearranging the order of the grayscale levels in the screen pattern cell is to diffuse the internal moire artifacts in the final halftone to nearby pixels, thereby rendering the internal moire artifacts less noticeable.
摘要翻译：通过重新排列原始屏幕图案单元中的灰度级的顺序来扩散在摄影图像的数字半色调中发现的内部莫尔条纹，以生成具有存储的屏幕图案像素的不同灰度级的新的屏幕图案单元。通过在灰度级（212）中按照原始单元格（206）中的每个点添加凸点函数（216）来修改原始单元格的灰度级。新的灰度级顺序被存储在新的单元格中（214）。在原始单元格（206）中的选定点添加凸起函数（216）会影响灰度级中下一个像素的选择，以使新单元格中的灰度级顺序通常与原始细胞因此，内部莫尔效应引起的误差在灰度尺度上扩散，也在空间维度上各向同性地扩散。在屏幕图案单元中重新排列灰阶级别的效果是将最终半色调中的内部波纹伪像扩散到附近的像素，从而使得内部莫尔伪影不显着。

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