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公开(公告)号：US06618559B1
公开(公告)日：2003-09-09
申请号：US10192943
申请日：2002-07-11
申请人： Gregory V. Hofer
发明人： Gregory V. Hofer
IPC分类号： G03B500
CPC分类号： H04N5/23296 , G02B15/14 , G02B15/177
摘要： A focal length position of a zoom lens is calibrated by performing at least one focal length adjustment, collecting a time period measurement for each focal length adjustment, and calculating a calibrated time to zoom to a desired focal length based on the time period measurements.
摘要翻译： 变焦镜头的焦距位置通过执行至少一个焦距调整，收集每个焦距调整的时间周期测量以及基于时间段测量来计算校准时间以放大到所需焦距来校准。
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公开(公告)号：US5703848A
公开(公告)日：1997-12-30
申请号：US222972
申请日：1994-04-05
申请人： Gregory V. Hofer
发明人： Gregory V. Hofer
CPC分类号： G11B7/0946
摘要： An optical disk drive system having a means for detecting off-track conditions with high reliability under conditions causing the objective lens to deviate from optimal focus, such as in the presence of external mechanical shocks. As the lens travels out of focus, the ability to resolve features decreases due to the loss of image contrast, causing a loss of tracking error signal (TES) gain. A digital signal processor (DSP) compensates for this loss by continuously determining an adjustable TES threshold representing the same desired percentage off track and same percentage of TES amplitude. A straight line approximation of this ideal adjustable threshold is used as a threshold to determine if the beam is within the desired amount off track. Alternatively, the DSP amplifies the TES by an amplification function to maintain the TES at a constant value while the objective lens travels out of focus. The TES amplification function is a straight line approximation of an ideal amplification function. The amplified TES is then compared against a fixed TES threshold to determine if the beam is within the desired amount off track. The DSP compensates for head optics astigmatism by shifting the adjustable TES threshold and adjustable TES amplification to a corrected position corresponding to the optimum TES. Dual adjustable and fixed TES thresholds are utilized to filter noise glitches on smaller off track conditions and simultaneously provide fast detection of large off track excursions.
摘要翻译： 一种光盘驱动器系统，具有用于在导致物镜偏离最佳焦点的条件下，例如在存在外部机械冲击的情况下，用于检测在可靠性高的条件下的偏离条件的装置。 随着镜头走出焦点，由于图像对比度的损失，解析特征的能力降低，导致跟踪误差信号（TES）增益的损失。 数字信号处理器（DSP）通过连续地确定表示相同的期望百分比偏离轨迹和相同百分比的TES幅度的可调TES阈值来补偿该损耗。 该理想可调阈值的直线近似被用作阈值，以确定光束是否在期望的量偏离轨迹之内。 或者，DSP通过放大功能放大TES，以在物镜离开焦点时将TES保持在恒定值。 TES放大功能是理想放大功能的直线近似。 然后将放大的TES与固定的TES阈值进行比较，以确定光束是否处于所需量的轨迹以外。 DSP通过将可调TES阈值和可调TES放大转换为对应于最佳TES的校正位置来补偿头部光学像散。 双调节和固定的TES阈值用于在较小的偏离轨道条件下对噪声毛刺进行滤波，并同时提供快速检测大的偏离轨迹偏移。
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公开(公告)号：US5113384A
公开(公告)日：1992-05-12
申请号：US411706
申请日：1989-09-25
IPC分类号： G11B7/085 , G11B7/09 , G11B11/105
CPC分类号： G11B7/08511 , G11B7/0945 , G11B11/10576 , G11B11/10595 , G11B7/0908
摘要： A method for obtaining focus capture in an optical disk drive having a focus servo system with a servo loop and operable in open and closed loop modes, including: opening the servo loop and operating the servo system in the open-loop mode; scanning an objective lens about a focus axis with respect to an optical disk at a calibration velocity; peak detecting focus error signals produced while the lens is scanned at the calibration velocity to determine a peak focus error signal value; storing a calibration threshold value as a function of the peak focus error signal value; scanning the objective lens about the focus axis at a focus capture velocity; comparing the focus error signal values produced while the lens is scanned at the focus capture velocity to the calibration threshold value; and closing the servo loop and operating the focus servo system in the closed-loop mode when the focus error signal values reach the calibration threshold value.
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公开(公告)号：US4942564A
公开(公告)日：1990-07-17
申请号：US265219
申请日：1988-10-31
IPC分类号： G11B7/09
CPC分类号： G11B7/0941 , G11B7/09 , G11B7/0945
摘要： A method for operating a programmable digital signal processor in an optical disk drive to compensate tracking and/or focus servo system gain each time a new disk is inserted. The digital signal processor receives a servo error signal and outputs a servo control signal. Data characteristic of a desired servo system gain at a predetermined test frequency is stored in memory. The digital signal processor generates a test signal at the test frequency and sums the test signal with the servo error signal. Servo system gain at the test frequency is determined by computing the ratio of the amplitude of the servo error signal before it is summed with the test signal and the amplitude of the summed servo error signal and test signal. A corrected gain factor is computed as a function of the current servo system gain, the desired servo system gain and current gain factor. The corrected gain factor is stored in memory. The servo error signal is thereafter multiplied by the gain factor so servo system gain equals the desired servo system gain.
摘要翻译： 一种用于在光盘驱动器中操作可编程数字信号处理器以补偿每次插入新磁盘时跟踪和/或聚焦伺服系统增益的方法。 数字信号处理器接收伺服误差信号并输出伺服控制信号。 在预定测试频率下所需伺服系统增益的数据特性被存储在存储器中。 数字信号处理器以测试频率产生测试信号，并将测试信号与伺服误差信号相加。 在测试频率下的伺服系统增益通过计算伺服误差信号的幅度与测试信号相加的幅度与求和的伺服误差信号和测试信号的幅度之比来确定。 根据当前的伺服系统增益，期望的伺服系统增益和电流增益因子计算校正的增益因子。 校正的增益因子存储在存储器中。 伺服误差信号此后乘以增益因子，因此伺服系统增益等于所需的伺服系统增益。
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公开(公告)号：US08063940B2
公开(公告)日：2011-11-22
申请号：US10842223
申请日：2004-05-10
申请人： Donald J. Stavely , Christopher A. Whitman , Gregory V. Hofer , David K. Campbell , Jason E. Yost
发明人： Donald J. Stavely , Christopher A. Whitman , Gregory V. Hofer , David K. Campbell , Jason E. Yost
IPC分类号： H04N5/228
CPC分类号： H04N5/23258 , G03B17/00 , H04N5/23287
摘要： Image stabilization systems and methods are disclosed. One embodiment of the image stabilization method, among others, includes detecting motion of a camera, and responsive to the detected motion, changing an optical filter orientation to displace an image provided on a sensor.
摘要翻译： 公开了图像稳定系统和方法。 图像稳定方法的一个实施例包括检测相机的运动，并且响应于检测到的运动，改变光学滤波器取向以移位设置在传感器上的图像。
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26.发明授权公开(公告)号：US07620304B2
公开(公告)日：2009-11-17
申请号：US11410703
申请日：2006-04-24
申请人： Joel B. Larner , Gregory V. Hofer
发明人： Joel B. Larner , Gregory V. Hofer
IPC分类号： G03B17/00
CPC分类号： G03B15/00 , G03B7/00 , G03B7/14 , G03B2217/005
摘要： A digital imaging device, such as a digital camera, minimizes shutter lag by determining some capture parameters, such as focus and exposure settings, before a user of the device has indicated that a photograph is to be taken. The parameters are updated when the device becomes substantially still before the indication that a photograph is to be taken.
摘要翻译： 诸如数码相机的数字成像装置在设备的用户已经指示要拍摄照片之前，通过确定一些拍摄参数（诸如焦点和曝光设置）来最小化快门延迟。 当设备在要拍摄照片的指示之前基本上仍然变化时，参数被更新。
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公开(公告)号：US07343047B2
公开(公告)日：2008-03-11
申请号：US10946771
申请日：2004-09-22
申请人： Eric F. Aas , Gregory V. Hofer , Casey L. Miller
发明人： Eric F. Aas , Gregory V. Hofer , Casey L. Miller
CPC分类号： H04N5/23212 , G02B7/36
摘要： A method comprises detecting edges in at least a region of a captured focus image, using adjacent pixels of the region to obtain first edge detection results and filtering the first edge detection results. The first filtering comprises comparing differences in pixel contrast in the first edge detection results with a first threshold value and removing the differences in pixel contrast that are less than the first threshold value from the first edge detection results. The method further comprises detecting edges in at least the region, using non-adjacent pixels of the region to obtain second edge detection results and filtering the second edge detection results. The second filtering comprising comparing differences in pixel contrast in the second edge detection results with a second threshold value and removing the differences in pixel contrast that are less than the second threshold value from the second edge detection results.
摘要翻译： 一种方法包括使用所述区域的相邻像素来检测所捕获的聚焦图像的至少一个区域中的边缘，以获得第一边缘检测结果并对第一边缘检测结果进行滤波。 第一滤波包括将第一边缘检测结果中的像素对比度的差异与第一阈值进行比较，并且从第一边缘检测结果去除小于第一阈值的像素对比度的差异。 该方法还包括使用该区域的不相邻像素来检测至少该区域中的边缘，以获得第二边缘检测结果并对第二边缘检测结果进行滤波。 第二滤波包括将第二边缘检测结果中的像素对比度的差异与第二阈值进行比较，并且从第二边缘检测结果去除小于第二阈值的像素对比度的差异。
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公开(公告)号：US20080044170A1
公开(公告)日：2008-02-21
申请号：US11464828
申请日：2006-08-16
申请人： Choon Hwee Yap , Gregory V. Hofer
发明人： Choon Hwee Yap , Gregory V. Hofer
IPC分类号： G03B7/093
CPC分类号： G03B7/093
摘要： An image capturing system capable of providing an optimal exposure setting and method of operating the same are disclosed. The image capturing system includes a CMOS image sensor having photosensitive cells; a lens module having a mechanical shutter; a memory having a program for exposure analysis and a program for detecting motion stored therein; and a controller having a processor. The processor is configured to execute the program for exposure analysis and the program for detecting motion. The exposure analysis includes determining the exposure time for capturing an image of a scene based on the brightness of the scene and comparing the exposure time with the closing time of the mechanical shutter. The controller is operable to set the image capturing system to either a “Global-Reset mode” or an “Electronic-Rolling-Shutter” (ERS) mode based on the output of the exposure analysis and motion detection. In the Global Reset mode, the mechanical shutter is utilized during sensor readout to shield the photosensitive cells from extraneous light. In the ERS mode, an electronic rolling shutter is utilized to perform image exposure and readout without closing the mechanical shutter at the end of an exposure period.
摘要翻译： 公开了能够提供最佳曝光设置的图像捕获系统及其操作方法。 图像捕获系统包括具有感光单元的CMOS图像传感器; 具有机械快门的透镜模块; 具有用于曝光分析的程序的存储器和用于检测存储在其中的运动的程序; 以及具有处理器的控制器。 处理器被配置为执行用于曝光分析的程序和用于检测运动的程序。 曝光分析包括基于场景的亮度确定用于拍摄场景的图像的曝光时间，并将曝光时间与机械快门的关闭时间进行比较。 控制器可操作以基于曝光分析和运动检测的输出将图像拍摄系统设置为“全局复位模式”或“电子滚动快门”（ERS）模式。 在全局复位模式下，在传感器读数期间使用机械快门来屏蔽感光细胞的外界光线。 在ERS模式中，电子滚动快门用于在曝光期结束时不关闭机械快门来执行图像曝光和读出。
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公开(公告)号：US07289151B2
公开(公告)日：2007-10-30
申请号：US10882826
申请日：2004-07-01
IPC分类号： G02B13/00
CPC分类号： H04N5/23212
摘要： In one embodiment there is shown a method for capturing data, the method comprising sensing a first signal, capturing an auto exposure (AE) image in response to a sensed first signal, the auto exposure image captured with settings based upon preestablished criterion, and upon the AE image being captured, determining if a second signal has been sensed, and if the second signal has been sensed, capturing a speculative full exposure image, and if the captured speculative full exposure is determined to be acceptable, reading the remainder of the captured speculative image.
摘要翻译： 在一个实施例中，示出了一种用于捕获数据的方法，所述方法包括感测第一信号，响应于感测的第一信号捕获自动曝光（AE）图像，基于预先建立的标准的设置捕获的自动曝光图像，以及根据 拍摄的AE图像，确定是否已经感测到第二信号，并且如果已经感测到第二信号，则捕获推测性全曝光图像，并且如果捕获的推测全曝光被确定为可接受，则读取所捕获的剩余部分 投机形象。
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公开(公告)号：US06546203B2
公开(公告)日：2003-04-08
申请号：US09886448
申请日：2001-06-21
申请人： Gregory V Hofer
发明人： Gregory V Hofer
IPC分类号： G03B1503
CPC分类号： H04N5/2354 , G03B15/05 , G03B2215/05 , H04N5/2351
摘要： A camera adjusts its strobe energy to achieve proper exposure of a photograph. The adjustment method uses two trial exposures of the scene to be photographed. One trial exposure is taken without the camera strobe using only ambient illumination. The other trial exposure is taken using the camera strobe at a pre-set energy level. Pixels that appear as saturated in the ambient-only trial exposure are discounted in the determination of the strobe energy for the final photograph. This method properly exposes scenes which themselves contain bright light sources such as lamps or light fixtures.
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