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    • 3. 发明授权
    • Fast and accurate current driver with zero standby current and features for boost and temperature compensation for MRAM write circuit
    • 具有零待机电流的快速准确的电流驱动器和用于MRAM写电路的升压和温度补偿功能
    • US08217684B2
    • 2012-07-10
    • US12925004
    • 2010-10-12
    • Perng-Fei YuhPokang WangLejan PuMinh TranChao-Hung Chang
    • Perng-Fei YuhPokang WangLejan PuMinh TranChao-Hung Chang
    • H03B1/00
    • G05F3/26G11C11/16G11C29/021G11C29/028
    • Systems and methods for realizing current drivers without current or voltage feedback for devices that require accurate current drive with zero standby current has been disclosed. In a preferred embodiment of the invention this current driver is applied for write circuits for MRAMs. A fast and accurate reference current is generated by diode voltage divided by resistor without any feedback. The diode current is not fed back from the reference current. The diode current is generated from a regulated voltage. Temperature compensation of the write current is inherently built in the diode current reference. Fine-tuning of the temperature coefficient is achieved by mixing poly and diffusion resistors. A switch inserted in the current driver can turn on the driver fast and without a need for standby current. Leading boost in the current driver can fast charge the large coupling capacitance of word and bit lines and speed up write timing.
    • 已经公开了用于实现没有电流或电压反馈的电流驱动器的系统和方法,用于需要具有零待机电流的精确电流驱动的装置。 在本发明的优选实施例中,该电流驱动器被应用于MRAM的写入电路。 通过二极管电压除以电阻而没有任何反馈产生快速准确的参考电流。 二极管电流不从参考电流反馈。 二极管电流由调节电压产生。 写入电流的温度补偿固有地内置在二极管电流参考中。 通过混合多聚电阻和扩散电阻来实现温度系数的微调。 插入当前驱动程序的开关可快速打开驱动器,无需待机电流。 当前驱动器的领先提升可以快速充电字和位线的大耦合电容,并加快写时序。
    • 5. 发明申请
    • SYSTEM AND METHOD FOR VARIABLE-RESOLUTION IMAGE SAVING
    • 用于可变分辨率图像保存的系统和方法
    • US20080180520A1
    • 2008-07-31
    • US11627424
    • 2007-01-26
    • Chao-Hung ChangTain-Tzu ChangChow-Ing Chang
    • Chao-Hung ChangTain-Tzu ChangChow-Ing Chang
    • H04N7/00
    • H04N5/77
    • A system and method for variable-resolution image saving includes an image capturing member, a data saving member, and an image data processor. A first panoramic image data is captured by the image capturing member in high resolution. The image data is then analyzed and divided into target area and background area. The resolution of background area is lowered to reduce the size of image data. A second panoramic image is then formed with the target area in original high resolution and background area in lower resolution. In this way, memory size and time required for storing and transmitting the second panoramic image data are greatly reduced without loosing important features of the target area.
    • 用于可变分辨率图像保存的系统和方法包括图像捕获构件,数据保存构件和图像数据处理器。 第一全景图像数据被高分辨率的图像捕获构件捕获。 然后分析图像数据并将其划分为目标区域和背景区域。 降低背景区域的分辨率以减小图像数据的大小。 然后以较低分辨率的原始高分辨率和背景区域中的目标区域形成第二全景图像。 以这种方式,存储和发送第二全景图像数据所需的存储器大小和时间大大减少,而不会失去目标区域的重要特征。
    • 6. 发明申请
    • Partial image saving system and method
    • 部分图像保存系统和方法
    • US20060007307A1
    • 2006-01-12
    • US10888707
    • 2004-07-12
    • Chao-Hung Chang
    • Chao-Hung Chang
    • H04N7/18H04N9/47
    • G08B13/19676G08B13/19669H04N7/18
    • The present invention relates to a system and method for partial image saving. The system contains at least one image-taking device, and one digital data saving and process device, which is connected to said image-taking device for receiving and process the latest image data. The digital data saving and process device contains at least one data saving device, and one image data process device. The data saving device contains at least one temporary data file, and at least one long-term data file. The latest complete image data taken by the image-taking device is first stored in the temporary data file. The image data process device will then identify targets of interest, within the complete image area, based on user-defined criteria. The image data around the targets of interest are finally stored in the long-term data file. The temporary data file will then be empty, ready for next image data. With this method, the repeated, un-important background image data are eliminated; only the image data of the area surrounding the targets of interest are stored and/or transmitted. The burden of storing and transmitting image data can be significantly reduced. The purpose of surveillance covering large area while keeping only the image data of targets of interest is then meet.
    • 本发明涉及用于部分图像保存的系统和方法。 该系统包含至少一个摄像设备和一个数字数据保存和处理设备,其连接到所述摄像设备,用于接收和处理最新的图像数据。 数字数据保存和处理装置包含至少一个数据保存装置和一个图像数据处理装置。 数据保存装置包含至少一个临时数据文件和至少一个长期数据文件。 由摄像装置拍摄的最新的完整图像数据首先存储在临时数据文件中。 然后,图像数据处理装置将根据用户定义的标准在完整图像区域内识别感兴趣的目标。 感兴趣目标周围的图像数据最终存储在长期数据文件中。 临时数据文件将为空,准备下一个图像数据。 利用该方法,消除了重复的不重要的背景图像数据; 仅存储和/或发送感兴趣目标周围区域的图像数据。 存储和传输图像数据的负担可以大大降低。 然后满足大面积监视的目的,同时只保留目标的图像数据。