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    Reducing smear and slow response artifacts in vector error diffusion
    3.
    发明授权
    Reducing smear and slow response artifacts in vector error diffusion 失效

    公开(公告)号：US09848105B1

    公开(公告)日：2017-12-19

    申请号：US09080700

    申请日：1998-05-18

    申请人： Zhigang Fan

    发明人： Zhigang Fan

    IPC分类号： H04N1/405 ,  H04N1/60 ,  G06K15/02

    CPC分类号： H04N1/4052 ,  G06K15/1881 ,  H04N1/52 ,  H04N1/6027

    摘要： A method of color image processing for quantizing output includes obtaining an input for an object pixel which is represented by a vector in a first color space. A modified input equal to the input plus a sum of errors from other pixels in a neighborhood of the object pixel is generated. For each color component in the first color space, where corresponding color components of the modified input are located with respect to a preset range is determined. If the modified input's color component is greater than the preset range, then that color component for an output is determined to be on; if less than the preset range, then that color component for the output is determine to be off; and, if within the preset range, then that color component for the output is determined to be unknown. A transformed modified input is mapped to a perceptual color space when any color component of the output is unknown. Colors consistent with color components of the output that have already been determined are also mapped to the perceptual color space. The color in the perceptual color space that lies closest to the transformed modified input is chosen. An output in the first color space having color components on and off is generated consistent with the determinations and/or choices made. Error for the object pixel is then calculated as the difference between the output and the modified input.

    IMAGE CAPTURE BY SCENE CLASSIFICATION
    4.
    发明申请
    IMAGE CAPTURE BY SCENE CLASSIFICATION 有权
    通过场景分类的图像捕获

    公开(公告)号：US20160286114A1

    公开(公告)日：2016-09-29

    申请号：US15081281

    申请日：2016-03-25

    申请人： Zhigang Fan

    发明人： Zhigang Fan

    IPC分类号： H04N5/235 ,  H04N5/232 ,  G02B7/28 ,  G06T5/00 ,  G06T5/20 ,  G06K9/46 ,  G06K9/62 ,  G06T7/00

    CPC分类号： H04N5/2352 ,  G02B7/285 ,  G06K9/4661 ,  G06K9/6267 ,  H04N5/23212

    摘要： A method, a device and a computer readable for automatically identifying a Christmas tree scene and setting a camera's focus and/or exposure parameters in a way that yields images with high image quality. The Christmas tree scene identification can be performed by segmenting the image into bright and dark regions, identifying the light objects, collecting the statistics of the light objects, and classifying the scene based on the statistics of the light objects, or by collecting the pixel value statistics for the image, and classifying the scene based on the statistics of the pixel values, or by collecting the pixel value statistics for the image, filtering the image, collecting the pixel value statistics for the filtered image, and classifying the scene by comparing the statistics of the pixel values before and after filtering. The focus and exposure settings can be adjusted based on the Christmas tree scene identification results. For Christmas tree scenes, the exposure can be set based on a value that is adjusted upwards from the mean luminance of the image, or on a value that is calculated from the top luminance value. The focus can be set by identifying the lights in the image, and minimizing the light size in the image.

    摘要翻译： 用于自动识别圣诞树场景并以产生具有高图像质量的图像的方式设置相机的焦点和/或曝光参数的方法，设备和计算机。 可以通过将图像分割成明暗区域，识别光对象，收集光对象的统计数据和基于光对象的统计信息对场景进行分类，或者通过收集像素值来执行圣诞树场景识别 统计图像，并根据像素值的统计信息对场景进行分类，或者通过收集图像的像素值统计信息，过滤图像，收集滤波图像的像素值统计数据，并对场景进行分类比较 过滤前后像素值的统计。 焦点和曝光设置可以根据圣诞树场景识别结果进行调整。 对于圣诞树场景，可以基于从图像的平均亮度向上调整的值或从顶部亮度值计算的值来设置曝光。 可以通过识别图像中的光，并最小化图像中的光线大小来设置焦点。

    CAMERA SYSTEMS WITH ENHANCED DOCUMENT CAPTURE
    5.
    发明申请
    CAMERA SYSTEMS WITH ENHANCED DOCUMENT CAPTURE 审中-公开
    具有增强文档捕获的摄像机系统

    公开(公告)号：US20160275345A1

    公开(公告)日：2016-09-22

    申请号：US14663538

    申请日：2015-03-20

    申请人： Zhigang Fan

    发明人： Zhigang Fan

    IPC分类号： G06K9/00

    CPC分类号： G06K9/00442 ,  G06K2009/363

    摘要： A method, a mobile image capturing device and a computer readable for capturing and processing both document and non-document images in optimized manners. The present invention contains steps: a) determining if an image to be captured is a document image or a non-document image; b) capturing and processing said image with methods and parameters optimized for document images if said determination is document; c) capturing and processing said image with methods and parameters optimized for non-document images if said determination is non-document.

    Smartphone augmented video-based on-street parking management system
    6.
    发明授权
    Smartphone augmented video-based on-street parking management system 有权
    智能手机增强了基于视频的路边停车管理系统

    公开(公告)号：US09367966B2

    公开(公告)日：2016-06-14

    申请号：US13461161

    申请日：2012-05-01

    申请人： Zhigang Fan ,  Yao Rong Wang

    发明人： Zhigang Fan ,  Yao Rong Wang

    IPC分类号： G07B15/02 ,  G06K9/00 ,  H04N7/18

    CPC分类号： G07B15/02 ,  G06K9/00785 ,  H04N7/181

    摘要： A method and a system for automating parking payment includes receiving video data in a sequence of frames provided by a video capture device observing a parking area. The method includes detecting a vehicle in the parking area using the video data. The method further includes receiving information of a vehicle in the parking area provided by a user device. The method includes comparing the characteristics of the detected vehicle with the information from the user device. In response to the characteristics of the detected vehicle being a match to the information sent from the user device, the method includes tracking the detected vehicle across the sequence of frames. The method includes computing a duration that the detected vehicle remains stationary using the tracking. The method includes computing an amount for charging the associated user device based on the duration.

    摘要翻译： 一种用于自动化停车支付的方法和系统包括以观看停车区域的视频捕获设备提供的帧序列接收视频数据。 该方法包括使用视频数据来检测停车区域中的车辆。 该方法还包括在由用户设备提供的停车区域中接收车辆的信息。 该方法包括将检测到的车辆的特征与来自用户设备的信息进行比较。 响应于检测到的车辆的特征与从用户设备发送的信息的匹配，该方法包括在帧序列之间跟踪检测到的车辆。 该方法包括使用跟踪来计算检测到的车辆保持静止的持续时间。 该方法包括基于持续时间计算用于对相关联的用户设备计费的量。

    System and method for embedding machine-readable codes in a document background
    8.
    发明授权
    System and method for embedding machine-readable codes in a document background 有权
    将机器可读代码嵌入到文档背景中的系统和方法

    公开(公告)号：US08807442B2

    公开(公告)日：2014-08-19

    申请号：US13552177

    申请日：2012-07-18

    申请人： Zhigang Fan ,  Yonghui Zhao ,  Hengzhou Ding

    发明人： Zhigang Fan ,  Yonghui Zhao ,  Hengzhou Ding

    IPC分类号： G06K19/06

    CPC分类号： G06K19/06103

    摘要： A method and apparatus are disclosed for embedding a two-dimensional machine-readable code into the background of a document in an aesthetically pleasing manner. The objects (picture, graphics, text, etc.) in a document image are first segmented from the background. A location for embedding the barcode is determined. A texture image is created by replicating the barcode to a size that covers the entire image. A modulation index map is generated from the segmentation results. The original image is modulated to produce the output image based on the texture image and the modulation index map.

    摘要翻译： 公开了一种用于以美观的方式将二维机器可读代码嵌入到文档的背景中的方法和装置。 文档图像中的对象（图片，图形，文本等）首先从背景分割。 确定用于嵌入条形码的位置。 通过将条形码复制到覆盖整个图像的大小来创建纹理图像。 从分割结果生成调制索引图。 原始图像被调制以基于纹理图像和调制索引图生成输出图像。

    Video-based system and method for detecting exclusion zone infractions
    9.
    发明授权
    Video-based system and method for detecting exclusion zone infractions 有权
    基于视频的系统和检测排除区违规的方法

    公开(公告)号：US08666117B2

    公开(公告)日：2014-03-04

    申请号：US13441253

    申请日：2012-04-06

    申请人： Orhan Bulan ,  Yao Rong Wang ,  Robert P. Loce ,  Edgar A. Bernal ,  Zhigang Fan ,  Graham S. Pennington ,  David P. Cummins

    发明人： Orhan Bulan ,  Yao Rong Wang ,  Robert P. Loce ,  Edgar A. Bernal ,  Zhigang Fan ,  Graham S. Pennington ,  David P. Cummins

    IPC分类号： G06K9/00 ,  G08G1/16

    CPC分类号： G06K9/00771 ,  G06K9/3233

    摘要： A method for determining a parking violation includes receiving video data as a sequence of frames provided by a camera. The method includes defining a location of an exclusion zone in the video data. The method includes detecting a vehicle located in the defined exclusion zone. The detecting includes determining a background in an initial frame of the video data and determining a background in a select frame by applying a predetermined updating process. The detecting includes subtracting the background of the select frame from the initial frame to obtain an image difference. The detecting includes classifying the pixels in the image difference as foreground or background pixels and classifying the pixels in the foreground image as vehicle or non-vehicle pixels. The method includes determining a duration that the detected vehicle is in the exclusion zone based on a number of the sequence of frames including the detected vehicle.

    摘要翻译： 用于确定停车违规的方法包括接收视频数据作为由相机提供的帧序列。 该方法包括在视频数据中定义排除区域的位置。 该方法包括检测位于限定的禁区中的车辆。 检测包括确定视频数据的初始帧中的背景，并通过应用预定的更新过程来确定选择帧中的背景。 检测包括从初始帧中减去选择帧的背景以获得图像差异。 检测包括将图像差异中的像素分类为前景或背景像素，并将前景图像中的像素分类为车辆或非车辆像素。 该方法包括基于包括检测到的车辆的帧序列的数量来确定检测到的车辆在排除区域中的持续时间。