公开(公告)号：US20070064083A1

公开(公告)日：2007-03-22

申请号：US11524476

申请日：2006-09-20

Applicant: Suhail Saquib ,  Brian Busch

Inventor： Suhail Saquib ,  Brian Busch

IPC: B41J2/00

CPC classification number: B41J2/355

Abstract: A method estimates the temperature of a thermal print head element during printing. In one embodiment, the temperature is estimated using the resistance of the thermal print head element, which typically changes with the print head element temperature. The change in resistance of the print head element is exploited to indirectly estimate the temperature of the print head element.

Abstract translation: 一种方法估计打印期间热打印头元件的温度。 在一个实施例中，使用热打印头元件的电阻来估计温度，该打印头元件通常随打印头元件温度而变化。 利用打印头元件的电阻变化来间接估计打印头元件的温度。

公开(公告)号：US20050093923A1

公开(公告)日：2005-05-05

申请号：US10818883

申请日：2004-04-06

Applicant: Brian Busch ,  Daniel Bybell ,  William Donovan ,  Felix Lin ,  Suhail Saquib ,  Jay Thornton

Inventor： Brian Busch ,  Daniel Bybell ,  William Donovan ,  Felix Lin ,  Suhail Saquib ,  Jay Thornton

IPC: H04N1/60 ,  B41J1/00

CPC classification number: H04N1/6033

Abstract: Techniques are disclosed for performing color correction in a color printer. An RGB test image is printed to produce a printed calibration image. Colors in the printed calibration image are measured and compared to expected color values. A color corrector generates a printer lookup table (LUT) based on this comparison. The LUT may be generated based on models of the printer's print engine and previous LUTs. The color corrections are applied to subsequent print jobs to improve the quality of color output. Color measurement and correction may be performed using a closed-loop system contained within the printer that includes a color measurement device (such as a scanner) and a computer.

Abstract translation: 公开了用于在彩色打印机中执行颜色校正的技术。 打印RGB测试图像以产生打印的校准图像。 测量印刷校准图像中的颜色并将其与预期颜色值进行比较。 颜色校正器基于该比较生成打印机查找表（LUT）。 LUT可以基于打印机的打印引擎和先前的LUT的模型生成。 颜色校正应用于后续打印作业，以提高颜色输出的质量。 可以使用包含在包括彩色测量装置（例如扫描仪）和计算机的打印机内的闭环系统来执行颜色测量和校正。

公开(公告)号：US20050068404A1

公开(公告)日：2005-03-31

申请号：US10988896

申请日：2004-11-15

Applicant: Suhail Saquib ,  William Vetterling

Inventor： Suhail Saquib ,  William Vetterling

IPC: B41J2/36 ,  B41J2/365 ,  B41J2/37

CPC classification number: B41J2/3555 ,  B41J2/36 ,  B41J2/365

Abstract: A model of a thermal print head is provided that models the thermal response of thermal print head elements to the provision of energy to the print head elements over time. The thermal print head model generates predictions of the temperature of each of the thermal print head elements at the beginning of each print head cycle based on: (1) the current ambient temperature of the thermal print head, (2) the thermal history of the print head, (3) the energy history of the print head, and (optionally) (4) the current temperature of the print medium. The amount of energy to provide to each of the print head elements during a print head cycle to produce a spot having the desired density is calculated based on: (1) the desired density to be produced by the print head element during the print head cycle, and (2) the predicted temperature of the print head element at the beginning of the print head cycle.

Abstract translation: 提供热打印头的型号，其模拟热打印头元件的热响应，以便随着时间向打印头元件提供能量。 热打印头模型在每个打印头循环开始时产生每个热打印头元件的温度的预测，其基于：（1）热打印头的当前环境温度，（2）热打印头的热历史 打印头，（3）打印头的能量历史，（可选）（4）打印介质的当前温度。 在打印头循环期间，为了产生具有期望密度的点而提供给每个打印头元件的能量的量基于：（1）打印头周期期间由打印头元件产生的期望密度 ，和（2）在打印头周期开始时打印头元件的预测温度。

公开(公告)号：US20050007438A1

公开(公告)日：2005-01-13

申请号：US10910880

申请日：2004-08-04

Applicant: Brian Busch ,  Suhail Saquib ,  William Vetterling

Inventor： Brian Busch ,  Suhail Saquib ,  William Vetterling

IPC: B41J2/36 ,  B41J2/365 ,  B41J11/00 ,  B41J33/00

CPC classification number: B41J2/3555 ,  B41J2/36 ,  B41J2/365

Abstract: Techniques are disclosed for performing thermal history control in a thermal printer in which a single thermal print head prints sequentially on multiple color-forming layers in a single pass. Each pixel-printing interval may be divided into subintervals, which may be of unequal duration. Each sub-interval may be used to print a different color. The manner in which the input energy to be provided to each print head element is selected may be varied for each of the subintervals. For example, although a single thermal model may be used to predict the temperature of the print head elements in each of the subintervals, different parameters may be used in the different subintervals. Similarly, different energy computation functions may be used to compute the energy to be provided to the print head in each of the subintervals based on the predicted print head temperature.

Abstract translation: 公开了用于在热打印机中执行热历史控制的技术，其中单个热打印头在单次通过中顺序地在多个成色层上打印。 每个像素打印间隔可以被划分为可能具有不等长度的子间隔。 每个子间隔可以用于打印不同的颜色。 选择提供给每个打印头元件的输入能量的方式可以针对每个子区间而变化。 例如，虽然可以使用单个热模型来预测每个子区间中的打印头元件的温度，但是不同的参数可以用于不同的子区间。 类似地，可以使用不同的能量计算功能来基于预测的打印头温度计算要在每个子区间中提供给打印头的能量。

公开(公告)号：US20080040066A1

公开(公告)日：2008-02-14

申请号：US11888764

申请日：2007-08-02

Applicant: Brian Busch ,  Suhail Saquib ,  William Vetterling

Inventor： Brian Busch ,  Suhail Saquib ,  William Vetterling

IPC: G01K11/00 ,  B41J2/00

CPC classification number: B41J2/365 ,  B41J2/3555 ,  B41J2/36

Abstract: A model of a thermal print head is provided that models the thermal response of thermal print head elements to the provision of energy to the print head elements over time. The amount of energy to provide to each of the print head elements during a print head cycle to produce a spot having the desired density is calculated based on: (1) the desired density to be produced by the print head element during the print head cycle, (2) the predicted temperature of the print head element at the beginning of the print head cycle, (3) the ambient printer temperature at the beginning of the print head cycle, and (4) the ambient relative humidity.

Abstract translation: 提供热打印头的型号，其模拟热打印头元件的热响应，以便随着时间向打印头元件提供能量。 在打印头循环期间，为了产生具有期望密度的点而提供给每个打印头元件的能量的量基于：（1）打印头周期期间由打印头元件产生的期望密度 ，（2）打印头周期开始时的打印头元件的预测温度，（3）打印头循环开始时的环境打印机温度，以及（4）环境相对湿度。

公开(公告)号：US20060152766A1

公开(公告)日：2006-07-13

申请号：US11031690

申请日：2005-01-07

Applicant: Suhail Saquib

Inventor： Suhail Saquib

IPC: H04N1/405

CPC classification number: H04N1/603 ,  H04N1/405

Abstract: Techniques are disclosed for selectively dithering only a subset of a digital image. One or more ranges of digits are selected for dithering. Only those pixels having digits within the selected range(s) in the digital image are dithered. The image is printed after being selectively dithered. Digits may be selected for dithering if they have values within the range(s) of one or more non-monotonic regions of a printer transfer function. Dithering may be performed on the subset of the digital image by applying a nonlinear transformation is applied to the image and adding a dither pattern to the transformed image. The result is quantized, and the inverse of the nonlinear transformation is applied to the quantized image to produce a dithered image. The nonlinear transformation is constructed such that the effects of the dither pattern appear only in that subset of the image having digits in the selected range(s).

Abstract translation: 公开了仅选择性地抖动数字图像的子集的技术。 选择一个或多个数字范围进行抖动。 仅数字图像中所选范围内的数字的像素抖动。 在选择性抖动后打印图像。 如果数字具有在打印机传送功能的一个或多个非单调区域的范围内的值，则可以选择数字进行抖动。 可以通过对图像应用非线性变换并将抖动图案添加到变换图像来对数字图像的子集执行抖动。 对结果进行量化，并将非线性变换的逆向应用于量化图像以产生抖动图像。 构造非线性变换使得抖动图案的效果仅出现在具有选定范围内的数字的图像的子集中。

公开(公告)号：US20060077470A1

公开(公告)日：2006-04-13

申请号：US10960143

申请日：2004-10-07

Applicant: Suhail Saquib

Inventor： Suhail Saquib

IPC: H04N1/40

CPC classification number: H04N1/4092 ,  G06T5/004

Abstract: A sharpening filter is disclosed for performing density-dependent sharpening on digital images. In one embodiment, a digital image to be sharpened is decomposed into a plurality of high-pass versions of the image at different resolutions. These high-pass images are gained at each resolution and recombined with the original image to produce a sharpened version of the image. The gains that are applied at each resolution are density-dependent. As a result, the effects of density-dependent blurring are counteracted, such that the sharpness of the final printed image is independent of the print density. Techniques are disclosed for performing such density-dependent sharpening with a high degree of computational efficiency.

Abstract translation: 公开了一种用于在数字图像上进行与密度相关的锐化的锐化滤波器。 在一个实施例中，要锐化的数字图像以不同的分辨率被分解成多个图像的高通版本。 这些高通图像在每个分辨率下获得并与原始图像重新组合以产生图像的锐化版本。 在每个分辨率下应用的收益与密度相关。 结果，与密度相关的模糊的影响被抵消，使得最终打印图像的清晰度与打印密度无关。 公开了以高计算效率执行这种密度依赖性锐化的技术。

公开(公告)号：US20080030567A1

公开(公告)日：2008-02-07

申请号：US11906830

申请日：2007-10-04

Applicant: Brian Busch ,  Dirk Hertel ,  Leif Hille ,  Suhail Saquib

Inventor： Brian Busch ,  Dirk Hertel ,  Leif Hille ,  Suhail Saquib

IPC: B41J2/00

CPC classification number: B41J2/36

Abstract: A method for controlling the print density of individual heating elements of a thermal print head array determines respective energy values for each heating element in response to image pixel data to be printed, multiplies determined energy values by a respective predetermined correction factor for one or more respective heating elements for improving print density consistency between individual heating elements, and dithers adjusted energy values from the step of multiplying as a function of adjacent image pixels.

公开(公告)号：US20060152573A1

公开(公告)日：2006-07-13

申请号：US10990672

申请日：2005-01-10

Applicant: Brian Busch ,  Dirk Hertel ,  Leif Hille ,  Suhail Saquib

Inventor： Brian Busch ,  Dirk Hertel ,  Leif Hille ,  Suhail Saquib

IPC: B41J2/36

CPC classification number: B41J2/36

Abstract: A method for controlling the print density of individual heating elements of a thermal print head array determines respective energy values for each heating element in response to image pixel data to be printed, multiplies determined energy values by a respective predetermined correction factor for one or more respective heating elements for improving print density consistency between individual heating elements, and dithers adjusted energy values from the step of multiplying as a function of adjacent image pixels.

公开(公告)号：US20070036457A1

公开(公告)日：2007-02-15

申请号：US11546633

申请日：2006-10-12

Applicant: Suhail Saquib ,  Jay Thornton

Inventor： Suhail Saquib ,  Jay Thornton

IPC: G06K9/40

CPC classification number: H04N1/4072

Abstract: Techniques are disclosed for correcting the exposure of a digital image. An exposure predictor may be generated based on a set of images for which ground truth data are known. After identifying an optimal set of features, the exposure of the digital image may be corrected by extracting values of the selected optimal features from the image, using the predictor to predict a desired exposure correction for the image, and correcting the exposure of the image by the predicted desired amount. Exposure correction is based on a model that relates intensity of light in the world to the RGB digits of the digital image. The model comprises a gamma function that models the response of a typical monitor and a S-shaped curve that compresses the large dynamic range of the world to the small dynamic range of the RGB digit space.