公开(公告)号：US08467100B1

公开(公告)日：2013-06-18

申请号：US13561877

申请日：2012-07-30

申请人： Douglas Keithley ,  Randall Briggs

发明人： Douglas Keithley ,  Randall Briggs

IPC分类号： H04N1/405 ,  G06K15/00

CPC分类号： H04N1/4052

摘要： Halftoning apparatus and method that may generate and employ average values and shifts are described herein. The apparatus may include an unpacker to determine shifts and average values for a plurality of input pixel values, each pair of average value and shift being associated with a corresponding pair of the input pixel values. The apparatus may further include a halftone core coupled to the unpacker to receive the shifts and the average values from the unpacker and to generate pairs of output pixel values based at least in part on the received shifts and average values, wherein the output pixel values are for generating pixels of an image.

摘要翻译： 这里描述了可产生和应用平均值和偏移的半色调装置和方法。 该装置可以包括解包器以确定多个输入像素值的移位和平均值，每对平均值和移位与相应的一对输入像素值相关联。 该装置还可以包括耦合到解包器的半色调网络，以至少部分地基于接收到的移位和平均值来接收来自解包器的移位和平均值，并产生输出像素值对，其中输出像素值为 用于生成图像的像素。

公开(公告)号：US20080068048A1

公开(公告)日：2008-03-20

申请号：US11851432

申请日：2007-09-07

申请人： Douglas Keithley ,  Richard Taylor ,  Mark Montierth

发明人： Douglas Keithley ,  Richard Taylor ,  Mark Montierth

IPC分类号： H03B21/00

CPC分类号： H03L7/16

摘要： A digital circuit generates very precise clock frequencies for applications that can tolerate a small degree of jitter but require exact long term frequencies, e.g. a video clock for a laser printer. Some subpixel jitter is acceptable, but the overall pixel rate remains exact and consistent. In some applications, the jitter may be desirable to smear the EMI spectrum. For example, if the high frequency input clock is modulated, the edges of the video clock will also be modulated yet remain within the jitter and frequency specification.

摘要翻译： 数字电路为能够容忍小程度的抖动但需要精确的长期频率的应用产生非常精确的时钟频率，例如， 用于激光打印机的视频时钟。 一些子像素抖动是可接受的，但是整体像素速率保持精确和一致。 在一些应用中，可能需要抖动以涂抹EMI频谱。 例如，如果调制高频输入时钟，则视频时钟的边沿也将被调制，但仍保持在抖动和频率规范内。

公开(公告)号：US20060123158A1

公开(公告)日：2006-06-08

申请号：US10995987

申请日：2004-11-20

申请人： Charles Evans ,  Douglas Keithley

发明人： Charles Evans ,  Douglas Keithley

IPC分类号： G06F3/06

CPC分类号： G06F13/28

摘要： A method for intervaled memory transfer access provides periodic authorization signals to a memory access controller. The method cycles between: 1) inhibiting the memory access controller from writing data to a memory until the memory access controller receives a periodic authorization signal to cause the memory access controller to remove the inhibition and write a predetermined amount of data to the memory through a data bus, and 2) releasing the data bus following writing of the predetermined amount of data to the memory by inhibiting the memory access controller from writing further data.

摘要翻译： 间隔存储器传送访问的方法向存储器访问控制器提供周期性授权信号。 该方法循环：1）禁止存储器存取控制器将数据写入存储器，直到存储器存取控制器接收周期性授权信号，使存储器存取控制器消除禁止，并通过以下操作向存储器写入预定量的数据 数据总线，以及2）通过禁止存储器访问控制器写入另外的数据，将预定量的数据写入存储器之后释放数据总线。

公开(公告)号：US20060061827A1

公开(公告)日：2006-03-23

申请号：US10945735

申请日：2004-09-20

申请人： Roy Moss ,  Douglas Keithley ,  David Bartle

发明人： Roy Moss ,  Douglas Keithley ,  David Bartle

IPC分类号： G06K15/00

CPC分类号： G06K15/02 ,  G06T1/60

摘要： A method for image processing loads a cache line width column of image data into a data cache. The cache line width column of image data is then processed to enhance the image data; and the enhanced image data is then outputted.

摘要翻译： 图像处理方法将图像数据的高速缓存线宽列加载到数据高速缓存中。 然后处理图像数据的高速缓存行宽列，以增强图像数据; 然后输出增强的图像数据。

公开(公告)号：US20060023250A1

公开(公告)日：2006-02-02

申请号：US10903560

申请日：2004-07-29

申请人： Douglas Keithley ,  Mark Montierth ,  Richard Taylor

发明人： Douglas Keithley ,  Mark Montierth ,  Richard Taylor

IPC分类号： G06F3/12

CPC分类号： H04N1/047 ,  H04N1/1135 ,  H04N1/12 ,  H04N2201/0082 ,  H04N2201/04767 ,  Y10T307/68 ,  Y10T307/691 ,  Y10T307/718

摘要： A video controller includes a video block that connects to the print control engine and one laser driver. The video block includes a direct memory access (DMA) block, a video processor, a waveform generator including pattern and multiple pulse mode modulation, a frequency synthesizer, configuration registers, and a data bus. The frequency synthesizer connects to the waveform generator. The configuration registers connect to the DMA block, video processor and the waveform generator. The data bus, operative to carry bus control signals, connects the DMA block, video processor, waveform generator, and the configuration registers.

公开(公告)号：US20050235096A1

公开(公告)日：2005-10-20

申请号：US10826886

申请日：2004-04-15

申请人： Richard Taylor ,  Mark Montierth ,  Douglas Keithley

发明人： Richard Taylor ,  Mark Montierth ,  Douglas Keithley

IPC分类号： B41J5/30 ,  G06F3/12 ,  G06F13/00 ,  G06F13/12 ,  G06F13/38

CPC分类号： G06F13/385

摘要： The invention provides an architecture and method for implementing a programmable I/O interface. The primary function provides a generic reconfigurable interface for serial communications between a laser printer controller and the print mechanism. The design also supports vertical page synchronization (top of page detection).

摘要翻译： 本发明提供了一种用于实现可编程I / O接口的架构和方法。 主要功能为激光打印机控制器和打印机构之间的串行通信提供通用的可重新配置接口。 该设计还支持垂直页面同步（页首检测）。

公开(公告)号：US20050073705A1

公开(公告)日：2005-04-07

申请号：US10680018

申请日：2003-10-06

申请人： Lyman Hall ,  Douglas Keithley ,  Gary Zimmerman ,  David Bartle

发明人： Lyman Hall ,  Douglas Keithley ,  Gary Zimmerman ,  David Bartle

IPC分类号： B41J29/38 ,  G06F3/12 ,  G06F15/00

CPC分类号： G06F3/1297 ,  G03G15/5075 ,  G03G15/5087

摘要： The software on the host machine examines a pixel, either alone or in relation to adjacent pixels. Based on the image data contained in the pixel or group of pixels, a multi-bit value is generated that can be used by the printing device to easily reproduce the necessary detail of the original pixel. The multi-bit value also contains print engine control parameters to handle items such as toner miser mode, toner explosion, edge roll off, etc. The multi-bit value can be generated algorithmically by using a lookup table or by some combination of these methods.

摘要翻译： 主机上的软件可以单独检测像素，也可以检测相邻像素的像素。 基于包含在像素或像素组中的图像数据，生成可以由打印设备使用以便容易地再现原始像素的必要细节的多位值。 多位值还包含打印引擎控制参数，以处理诸如墨粉不足模式，墨粉爆炸，边缘滚降等项目。可以通过使用查找表或这些方法的某种组合在算法上生成多位值 。

公开(公告)号：US20080007611A1

公开(公告)日：2008-01-10

申请号：US11856478

申请日：2007-09-17

申请人： Douglas Keithley

发明人： Douglas Keithley

IPC分类号： B41J2/435

CPC分类号： B41J2/435 ,  B41J2/47 ,  G03G15/754 ,  G06K15/1204 ,  G06K2215/111 ,  H04N1/1135 ,  H04N1/12 ,  H04N2201/0458

摘要： A laser scanning assembly generates a laser beam and scans the laser beam through a plurality of scan lines to form desired dots. Each scan line is positioned to overlap an adjacent scan line and each dot includes a plurality of segments. The scanning assembly scans the laser beam through multiple scan lines to fully discharge each segment of each dot. The laser scanner assembly would typically be part of a laser printer.

摘要翻译： 激光扫描组件产生激光束并通过多条扫描线扫描激光束以形成所需的点。 每个扫描线被定位成与相邻扫描线重叠，并且每个点包括多个段。 扫描组件通过多个扫描线扫描激光束，以完全放电每个点的每个段。 激光扫描器组件通常是激光打印机的一部分。

公开(公告)号：US20060244807A1

公开(公告)日：2006-11-02

申请号：US11118591

申请日：2005-04-28

申请人： Douglas Keithley

发明人： Douglas Keithley

IPC分类号： B41J2/385

CPC分类号： H04N1/1135 ,  H04N1/12 ,  H04N2201/0468 ,  H04N2201/04787 ,  H04N2201/04791 ,  H04N2201/04796

摘要： A scanning system is adapted to scan an image beam across a photoconductive surface. The scanning system includes an oscillating mirror and is operable to generate an image beam and to reflect the image beam off the oscillating mirror to bidirectionally scan the image beam across the photoconductive surface and thereby discharge regions on the surface. The system is further operable to dynamically scale an intensity of the image beam as a function of a position of the image beam on the photoconductive surface.

摘要翻译： 扫描系统适于扫描通过光电导表面的图像束。 扫描系统包括振荡反射镜并可操作以产生图像光束并将图像光束从振荡镜反射出来以双向扫描图像束穿过光电导表面，从而放电表面上的区域。 该系统还可操作以根据图像束在光电导表面上的位置来动态地缩放图像束的强度。

公开(公告)号：US20060238225A1

公开(公告)日：2006-10-26

申请号：US11471392

申请日：2006-06-20

申请人： Douglas Keithley ,  Richard Taylor ,  Mark Montierth

发明人： Douglas Keithley ,  Richard Taylor ,  Mark Montierth

IPC分类号： H03B19/00

CPC分类号： H03L7/06

摘要： A digital circuit generates very precise varying clock frequencies for applications that can tolerate a small degree of jitter but require exact longer term frequencies, e.g. a video clock for a laser printer. Some subpixel jitter is acceptable, but the overall pixel rate remains exact and consistent. In some applications, the jitter may be desirable to smear the EMI spectrum. For example, if the high frequency input clock is modulated, the edges of the video clock will also be modulated yet remain within the jitter and frequency specification.