公开(公告)号：US20070071311A1

公开(公告)日：2007-03-29

申请号：US11343142

申请日：2006-01-30

申请人： Francisco Rovira-Mas ,  Qin Zhang ,  John Reid

发明人： Francisco Rovira-Mas ,  Qin Zhang ,  John Reid

IPC分类号： G06K9/00

CPC分类号： G06K9/00805 ,  G06T7/593 ,  G06T7/70

摘要： An image collection system collects stereo image data comprising left image data and right image data of a particular scene. An estimator estimates a reference three dimensional image density rating for corresponding reference volumetric cell within the particular scene at a reference range from an imaging unit. An image density compensator compensates for the change in image density rating between the reference volumetric cell and an evaluated volumetric cell by using a compensated three dimensional image density rating based on a range or relative displacement between the reference volumetric cell and the evaluated volumetric cell. An obstacle detector identifies a presence or absence of an obstacle in a particular compensated volumetric cell in the particular scene if the particular compensated volumetric cell meets or exceeds a minimum three dimensional image density rating

摘要翻译： 图像采集系统收集包括特定场景的左图像数据和右图像数据的立体图像数据。 估计器在来自成像单元的参考范围处估计在特定场景内的相应参考体积细胞的参考三维图像浓度等级。 图像浓度补偿器通过使用基于参考体积细胞和评估的体积细胞之间的范围或相对位移的补偿的三维图像密度等级来补偿参考体积细胞和评估的体积细胞之间的图像浓度等级的变化。 如果特定的补偿容积单元满足或超过最小三维图像密度等级，则障碍物检测器识别特定场景中的特定补偿容积单元中存在或不存在障碍物

公开(公告)号：US07086083B2

公开(公告)日：2006-08-01

申请号：US09835697

申请日：2001-04-16

申请人： Qin Zhang ,  Pingnan Shi

发明人： Qin Zhang ,  Pingnan Shi

IPC分类号： H04N7/16 ,  H04N7/173 ,  H04N17/00 ,  H04N5/21

CPC分类号： H04N17/00

摘要： A method of determining noise in a CATV channel, wherein the CATV channel comprises a predetermined frequency band, that employs digital signal processing to isolate the noise signal from an in-service television signal. The method includes an initial step of obtaining a television signal corresponding to a predetermined CATV channel, the television channel comprising a carrier signal modulated by an information signal. Thereafter, the method includes the step of sampling at least a part of the television signal to produce a digital signal segment, said digital signal segment comprising a carrier component, a noise signals component, and an information signal component, wherein said information signal component has a substantially predetermined signal pattern. The method then employs digital signal processing to separate the carrier component from the digital signal segment to produce a baseband signal substantially comprising the information signal and the noise signal. Finally, an estimate of the information signal is obtained and then subtracted from the baseband signal, thereby producing a noise signal estimate.

公开(公告)号：US06714662B1

公开(公告)日：2004-03-30

申请号：US09612851

申请日：2000-07-10

申请人： Eric R. Benson ,  Qin Zhang ,  John F. Reid

发明人： Eric R. Benson ,  Qin Zhang ,  John F. Reid

IPC分类号： G06K900

CPC分类号： G06K9/00664 ,  A01D41/127 ,  G06K9/00791 ,  G06T7/70 ,  G06T2207/30161

摘要： A combine having a camera system is disclosed in which pictures of the ground in front of the vehicle are processed to extract the slope and intercept of a characteristic line indicative of the boundary between the cut and uncut portions of the field. A fuzzy logic algorithm compares the slope and intercept using four input membership functions and a single output membership function. If the slope and intercept extracted from the image are deemed acceptable, they are used to navigate the vehicle through the field. If they are not acceptable, the combine continues to use slope and intercept values previously deemed acceptable to guide the vehicle. This process of image data extraction and quality analysis continues repetitively as the combine traverses the field harvesting crops.

摘要翻译： 公开了一种具有照相机系统的组合体，其中对车辆前方的地面图像进行处理，以提取表示该场的切割部分与未切割部分之间边界的特征线的斜率和截距。 模糊逻辑算法使用四个输入隶属函数和单个输出隶属函数来比较斜率和截距。 如果从图像提取的斜率和截距被认为是可接受的，则它们被用于通过场来导航车辆。 如果不能接受，则组合继续使用先前认为可接受的斜率和截距值来引导车辆。 这种图像数据提取和质量分析过程在组合遍历田间采收作物后，会持续反复进行。

公开(公告)号：US06621614B1

公开(公告)日：2003-09-16

申请号：US10087087

申请日：2002-02-27

申请人： Qin Zhang

发明人： Qin Zhang

IPC分类号： G02F103

CPC分类号： G02B6/29395 ,  G02B5/284 ,  G02B6/29358 ,  G02B6/29394

摘要： An etalon has a first surface which is partially reflective. The reflectivity of the first surface varies with position. Thus, this reflectivity can in effect be adjusted by varying the point at which an optical beam is incident upon the etalon. At one point of incidence, the optical beam experiences one reflectivity. At a different point of incidence, the optical beam experiences a different reflectivity.

摘要翻译： 标准具具有部分反射性的第一表面。 第一表面的反射率随位置而变化。 因此，通过改变光束入射到标准具上的点，实际上可以调节该反射率。 在一个入射点处，光束经历一个反射率。 在不同的入射点，光束经历不同的反射率。

公开(公告)号：US06563868B1

公开(公告)日：2003-05-13

申请号：US09182576

申请日：1998-10-29

申请人： Qin Zhang ,  Shlomo Ovadia

发明人： Qin Zhang ,  Shlomo Ovadia

IPC分类号： H03H2100

CPC分类号： H03H21/0012

摘要： The performance of a multiphase and/or multiple amplitude receiver, such as a 64/256 quadrature amplitude modulation (QAM) receiver, is improved in the presence of single and multiple echoes. A moving window adaptive decision feedback equalizer (DFE) is provided according to the adaptive equation Cn(k+1)=Cn(k)−&Dgr;·W(k)·En(k)·Xn(k), where &Dgr; (delta) is the step size, Cn(k) is the tap value of tap n for the k symbol, En(k) is the error output at the symbol k, Xn(k) is the received signal for pre-cursor taps (FFE) and past decision output for post-cursor taps (DFE), and W(k) is the sliding window function at symbol k. In the adaptation process, some coefficients are fixed while other taps are being adapted. In particular, the adaptation is focused on a group of taps which correspond to received echoes. By only adjusting these taps, no interference or noise is introduced to the decision making device in the digital receiver and therefore, the effect of noise and echoes on the adaptation control is substantially reduced.

摘要翻译： 在单个和多个回波存在的情况下，改进了多相和/或多幅度接收机（诸如64/256正交幅度调制（QAM）接收机）的性能。 根据自适应方程Cn（k + 1）= Cn（k）-DELTA.W（k）.En（k）.Xn（k）提供移动窗口自适应判决反馈均衡器（DFE），其中DELTA ）是步长，Cn（k）是k符号的抽头n的抽头值，En（k）是符号k处的误差输出，Xn（k）是用于前置标签的接收信号（FFE ）和过去的决策输出用于后视标（DFE），而W（k）是符号k的滑动窗函数。 在适应过程中，一些系数是固定的，而其他水龙头被适应。 特别地，适应性集中在对应于接收到的回波的一组抽头上。 通过仅调整这些抽头，数字接收机中的决策装置不会引入干扰或噪声，因此，噪声和回波对自适应控制的影响大大降低。

公开(公告)号：US06442463B1

公开(公告)日：2002-08-27

申请号：US09781019

申请日：2001-02-09

申请人： Hongchu Qiu ,  Qin Zhang ,  John F. Reid

发明人： Hongchu Qiu ,  Qin Zhang ,  John F. Reid

IPC分类号： G06F1900

CPC分类号： B62D1/28 ,  B62D6/00 ,  G05B13/0275 ,  Y10S706/905

摘要： A fuzzy steering controller for wheel-type agricultural vehicles with an electrohydraulic steering system is disclosed. The fuzzy controller was developed based on a common-sense model of agricultural vehicle steering. The controller implements steering corrections based upon the desired steering rate and the error between the desired and the actual wheel angles. The controller consists of a variable fuzzifier, an inference engine with a steering control rulebase, and a control signal defuzzifier. The controller could be used on different platforms. Tuning of the fuzzy membership functions will accommodate for physical differences between the platforms. The controller achieves prompt and accurate steering control performance on both a hardware-in-the-loop electrohydraulic steering simulator and on an agricultural tractor.

摘要翻译： 公开了一种具有电动液压转向系统的轮式农用车辆的模糊转向控制器。 模糊控制器是基于农用车辆转向的常识模型而开发的。 控制器基于期望的转向速率和期望的和实际的车轮角度之间的误差来实现转向校正。 控制器由可变模糊器，具有转向控制规则库的推理机和控制信号去模糊器组成。 控制器可以在不同的平台上使用。 调整模糊隶属函数将适应平台之间的物理差异。 控制器在硬件在环电动液压转向模拟器和农用拖拉机上实现快速准确的转向控制性能。

公开(公告)号：US06441961B1

公开(公告)日：2002-08-27

申请号：US09702962

申请日：2000-10-30

申请人： Hongtao Hou ,  Qin Zhang

发明人： Hongtao Hou ,  Qin Zhang

IPC分类号： G02B2728

CPC分类号： G02B6/29302 ,  G02B6/29361 ,  G02B6/29386 ,  G02B6/29395 ,  G02B27/283 ,  H04J14/02 ,  H04J14/06

摘要： An optical interleaver apparatus and method are disclosed. The apparatus comprises a first birefringent element, a first waveplate, a second birefringent element, a polarization rotation device and a retro-reflector. The first birefringent element separates an input optical signal into first and second beams having complementary polarizations. The first waveplate rotates a polarization of light in a first wavelength range, but not a second wavelength range. The second birefringent element splits the first and second beams into third, fourth, fifth and sixth beams. The polarization rotation device and retro-reflector are configured such that, on a reverse path, the second birefringent element combines the third beam with the sixth beam and the fourth beam with the fifth beam. The inventive apparatus may operate as either a demultiplexer or multiplexer. In an alternative embodiment, the apparatus includes a switchable polarization rotator disposed between the first birefringent element and the first waveplate. The switchable polarization rotator allows the apparatus to operate as a router by either rotating or not rotating the polarizations of the first and second beams.

摘要翻译： 公开了一种光交错器装置和方法。 该装置包括第一双折射元件，第一波片，第二双折射元件，偏振旋转装置和后向反射器。 第一双折射元件将输入光信号分离成具有互补极化的第一和第二光束。 第一波片旋转第一波长范围内的光的偏振光，但不是第二波长范围。 第二双折射元件将第一和第二光束分成第三，第四，第五和第六光束。 偏振旋转装置和后向反射器被构造成使得在反向路径上，第二双折射元件将第三光束与第六光束和第四光束与第五光束组合。 本发明的装置可以作为解复用器或多路复用器来操作。 在替代实施例中，该装置包括设置在第一双折射元件和第一波片之间的可切换偏振旋转器。 可切换的偏振旋转器允许设备通过旋转或不旋转第一和第二光束的偏振来作为路由器操作。

公开(公告)号：US5221967A

公开(公告)日：1993-06-22

申请号：US696945

申请日：1991-05-08

申请人： Rabab K. Ward ,  Qin Zhang

发明人： Rabab K. Ward ,  Qin Zhang

IPC分类号： G01R27/28 ,  G01R31/28 ,  H04N7/10 ,  H04N17/00

CPC分类号： H04N17/00 ,  G01R27/28 ,  G01R31/2825 ,  H04N7/10

摘要： A cable television signal for example may be monitored and impairments determined and in many cases classified by grabbing at least portion of a transmitted frame of video information somewhere on the network to provide a video signal, performing a two dimensional Fourier transform on the video signal and analyzing the Fourier transform so obtained to determine the location of areas indicating above average occurrence of specific frequencies to provide an indication of an impairment.

摘要翻译： 例如可以监视有线电视信号并确定损害，并且在许多情况下通过在网络上的某处抓取视频信息的发送帧的至少一部分来分类，以提供视频信号，对视频信号执行二维傅立叶变换，以及 分析如此获得的傅里叶变换以确定指示高于特定频率的平均出现的区域的位置，以提供损伤的指示。

公开(公告)号：US20160328465A1

公开(公告)日：2016-11-10

申请号：US14702763

申请日：2015-05-04

申请人： Qin Zhang

发明人： Qin Zhang

IPC分类号： G06F17/30 ,  G06F17/22

CPC分类号： G06F16/954

摘要： The present invention relates to a system and method for information process of web pages using artificially constructed apparatus. More specially, in one preferred embodiment of the present invention, web pages are processed to obtain types of web pages according to information related to the web pages or contents of the web pages, wherein the information related the web pages includes url addresses (links) of the web pages, icons (or texts) for links for the web pages, metadata of the web pages, etc.

公开(公告)号：US08855405B2

公开(公告)日：2014-10-07

申请号：US10817906

申请日：2004-04-06

申请人： Francisco Rovira Mas ,  Qin Zhang ,  John Franklin Reid

发明人： Francisco Rovira Mas ,  Qin Zhang ,  John Franklin Reid

IPC分类号： G06K9/00 ,  G06T15/00

CPC分类号： G01C23/00 ,  G06K9/00664 ,  G06K9/209 ,  G06T7/593 ,  G06T2207/10012 ,  G06T2207/30128

摘要： A system and method for creating 3-dimensional agricultural field scene maps are disclosed comprising producing a pair of images using a stereo camera and creating a disparity image based on the pair of images, the disparity image being a 3-dimensional representation of the stereo images. Coordinate arrays can be produced from the disparity image and the coordinate arrays can be used to render a 3-dimensional local map of the agricultural field scene. Global maps can also be made by using geographic location information associated with various local maps to fuse together multiple local maps into a 3-dimensional global representation of the field scene. The disparity images can be used to analyze a variety of agricultural features.

摘要翻译： 公开了一种用于创建三维农业场景地图的系统和方法，包括使用立体相机产生一对图像并基于该对图像创建视差图像，视差图像是立体图像的三维表示 。 可以从视差图像产生坐标阵列，坐标阵列可用于渲染农田场景的三维局部地图。 全球地图也可以通过使用与各种局部地图相关联的地理位置信息来将多个局部地图映射融合成场景场景的三维全局表示。 差异图像可用于分析各种农业特征。