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1. 发明授权

US08564697B2 Black level calibration method and system 有权
标题翻译：黑色电平校准方法和系统
公开(公告)号：US08564697B2
公开(公告)日：2013-10-22
申请号：US12582715
申请日：2009-10-21
申请人： Nguyen Dong , Amit Mittra , Chi-Shao Lin
发明人： Nguyen Dong , Amit Mittra , Chi-Shao Lin
IPC分类号： H04N9/64
CPC分类号： H04N5/361 , H04N5/335
摘要： Black level calibration methods and systems are generally disclosed. According to one embodiment of the present invention, a method of calibrating a black level signal in a frame includes performing an iteration of averaging a first set of digital values corresponding to a first set of adjusted black level signals associated with a first set of black pixels of the frame, determining whether an average value based on the first set of digital values has reached a target black level, determining a calibration offset based on a difference between the average value and the target black level and an accumulator step, converting the calibration offset to an analog signal, generating a calibration signal based on the analog signal for a second set of black pixels of the frame, and repeating the iteration for the frame until a predetermined condition is determined to have been met.
摘要翻译：通常公开黑电平校准方法和系统。根据本发明的一个实施例，一种在帧中校准黑电平信号的方法包括执行对与第一组黑色像素相关联的第一组经调整的黑电平信号相对应的第一组数字值进行平均的迭代确定基于第一组数字值的平均值是否已经达到目标黑电平，基于平均值和目标黑电平之间的差确定校准偏移和累加器步骤，将校准偏移转换模拟信号，基于该帧的第二组黑色像素的模拟信号产生校准信号，并重复该帧的迭代，直到确定已经满足预定条件。

2. 发明申请

US20090251572A1 EFFICIENT WIDE-RANGE AND HIGH-RESOLUTION BLACK LEVEL AND OFFSET CALIBRATION SYSTEM 审中-公开
标题翻译：有效的宽范围和高分辨率黑色和偏移校准系统
公开(公告)号：US20090251572A1
公开(公告)日：2009-10-08
申请号：US12061413
申请日：2008-04-02
申请人： Chi-Shao Lin , Amit Mittra
发明人： Chi-Shao Lin , Amit Mittra
IPC分类号： H04N5/16
CPC分类号： H04N5/165
摘要： A black level calibration (BLC) system is disclosed. A readout chain receives and amplifies dark signal, and generates corresponding digital output. A level integrator performs integration of calibration levels in multiple steps according to the digital output, thereby achieving wide calibration range.
摘要翻译：公开了黑电平校准（BLC）系统。读出链接收并放大暗信号，并产生相应的数字输出。电平积分器根据数字输出在多个步骤中执行校准电平的集成，从而实现宽的校准范围。

3. 发明授权

US08217328B2 Low noise pixel readout circuit with high conversion gain 有权
标题翻译：具有高转换增益的低噪声像素读出电路
公开(公告)号：US08217328B2
公开(公告)日：2012-07-10
申请号：US12436045
申请日：2009-05-05
申请人： Ping-Hung Yin , Amit Mittra , Chi-Shao Lin
发明人： Ping-Hung Yin , Amit Mittra , Chi-Shao Lin
IPC分类号： H03F3/08 , H01L27/00
CPC分类号： H03F3/08 , H01L27/14643 , H04N5/3559
摘要： A pixel circuit of a CMOS image sensor is disclosed. At least two transfer transistors are configured to transfer integrated light signals of corresponding photodetectors to a first node. A reset transistor is configured to reset the first node to a predetermined reset voltage of a second node, and a source follower is configured to buffer the integrated light signals. In one embodiment, a capacitor is further connected between the first node and the second node to minimize influence of the effective capacitance including capacitance of a floating diffusion region and parasitic capacitance due to the photodetector and the transfer transistor.
摘要翻译：公开了CMOS图像传感器的像素电路。至少两个传输晶体管被配置为将相应光电检测器的集成光信号传送到第一节点。复位晶体管被配置为将第一节点复位到第二节点的预定复位电压，并且源跟随器被配置为缓冲集成光信号。在一个实施例中，电容器还被连接在第一节点和第二节点之间，以最小化包括浮动扩散区域的电容和由于光电检测器和传输晶体管引起的寄生电容的有效电容的影响。

4. 发明授权

US08253827B2 Signal chain of an imaging system 有权
标题翻译：成像系统的信号链
公开(公告)号：US08253827B2
公开(公告)日：2012-08-28
申请号：US12555654
申请日：2009-09-08
申请人： Chih-Min Liu , Amit Mittra , Chi-Shao Lin
发明人： Chih-Min Liu , Amit Mittra , Chi-Shao Lin
IPC分类号： H04N9/64 , H04N5/235 , H04N5/228
CPC分类号： H04N5/361
摘要： A signal chain of an imaging system is disclosed. The system includes three circuit stages. The first circuit stage includes a programmable gain amplifier (PGA) and a black level compensation (BLC) circuit that form a BLC loop. The second circuit stage includes an analog-to-digital converter (ADC), where a dark signal offset is added at an input of the ADC. The third circuit stage includes a digital gain circuit and a digital loop that makes a final output of the imaging system settle on a target level in the BLC mode.
摘要翻译：公开了一种成像系统的信号链。该系统包括三个电路级。第一电路级包括形成BLC回路的可编程增益放大器（PGA）和黑电平补偿（BLC）电路。第二电路级包括模数转换器（ADC），其中在ADC的输入处加上暗信号偏移。第三电路级包括数字增益电路和使得成像系统的最终输出在BLC模式下达到目标电平的数字环路。

5. 发明申请

US20100282946A1 Low Noise Pixel Readout Circuit with High Conversion Gain 有权
标题翻译：具有高转换增益的低噪声像素读出电路
公开(公告)号：US20100282946A1
公开(公告)日：2010-11-11
申请号：US12436045
申请日：2009-05-05
申请人： Ping-Hung Yin , Amit Mittra , Chi-Shao Lin
发明人： Ping-Hung Yin , Amit Mittra , Chi-Shao Lin
IPC分类号： H03F3/08 , H01L27/00
CPC分类号： H03F3/08 , H01L27/14643 , H04N5/3559
摘要： A pixel circuit of a CMOS image sensor is disclosed. At least two transfer transistors are configured to transfer integrated light signals of corresponding photodetectors to a first node. A reset transistor is configured to reset the first node to a predetermined reset voltage of a second node, and a source follower is configured to buffer the integrated light signals. In one embodiment, a capacitor is further connected between the first node and the second node to minimize influence of the effective capacitance including capacitance of a floating diffusion region and parasitic capacitance due to the photodetector and the transfer transistor.
摘要翻译：公开了CMOS图像传感器的像素电路。至少两个传输晶体管被配置为将相应光电检测器的集成光信号传送到第一节点。复位晶体管被配置为将第一节点复位到第二节点的预定复位电压，并且源跟随器被配置为缓冲集成光信号。在一个实施例中，电容器还被连接在第一节点和第二节点之间，以最小化包括浮动扩散区域的电容和由于光电检测器和传输晶体管引起的寄生电容的有效电容的影响。

6. 发明申请

US20090295965A1 METHOD AND CIRCUIT FOR DRIVING ACTIVE PIXELS IN A CMOS IMAGER DEVICE 审中-公开
标题翻译：用于在CMOS成像器件中驱动有源像素的方法和电路
公开(公告)号：US20090295965A1
公开(公告)日：2009-12-03
申请号：US12129900
申请日：2008-05-30
申请人： Desmond Yu Hin Cheung , Amit Mittra , Chi-Shao Lin
发明人： Desmond Yu Hin Cheung , Amit Mittra , Chi-Shao Lin
IPC分类号： H04N5/335 , H01L27/146
CPC分类号： H04N5/3745 , H01L27/14641 , H04N5/357
摘要： One embodiment of the present invention describes a pixel circuit that comprises at least one photodiode, a first transistor coupled between the photodiode and a floating diffusion node, a second transistor coupled between the floating diffusion node and a modifiable driving voltage signal, and a third transistor having a gate coupled to the floating diffusion node, a source coupled to a signal output, and a drain coupled to a constant voltage. Another embodiment of the present invention provides a method for driving the pixel circuit, which comprises resetting the photodiode and the floating diffusion node, exposing the photodiode to light to accumulate charges, selecting the pixel circuit by switching the driving voltage signal from a first voltage level to a second voltage level, retrieving a reference voltage from the selected pixel circuit, and retrieving an image signal from the selected pixel circuit corresponding to the accumulated charges.
摘要翻译：本发明的一个实施例描述了一种像素电路，其包括至少一个光电二极管，耦合在光电二极管和浮动扩散节点之间的第一晶体管，耦合在浮动扩散节点和可修改驱动电压信号之间的第二晶体管，以及第三晶体管具有耦合到浮动扩散节点的栅极，耦合到信号输出的源极和耦合到恒定电压的漏极。本发明的另一个实施例提供了一种用于驱动像素电路的方法，该方法包括复位光电二极管和浮动扩散节点，将光电二极管暴露于光以累积电荷，通过从第一电压电平切换驱动电压信号来选择像素电路获取第二电压电平，从所选择的像素电路检索参考电压，以及从对应于累积电荷的所选择的像素电路中检索图像信号。

7. 发明授权

US08218038B2 Multi-phase black level calibration method and system 有权
标题翻译：多相黑电平校准方法及系统
公开(公告)号：US08218038B2
公开(公告)日：2012-07-10
申请号：US12635711
申请日：2009-12-11
申请人： Nguyen Dong , Amit Mittra , Ray-Chi Chang
发明人： Nguyen Dong , Amit Mittra , Ray-Chi Chang
IPC分类号： H04N9/64
CPC分类号： H04N5/361 , H04N5/3655 , H04N5/367
摘要： Multi-phase black level calibration (BLC) methods and systems are generally disclosed. According to one embodiment of the present invention, an image sensor comprises a pixel sensor array, a timing generator, and a front-end processing block. The front-end processing block also includes a first summing junction, a first BLC block, and a second BLC block. According to a first timing signal from the timing generator, the first BLC block is configured to iteratively generate a first calibration signal in a first phase based on a first set of adjusted black level signals associated with a first set of black pixels, a changing accumulator step, and a predetermined condition associated with a first target black level. According to a second timing signal from the timing generator, the second BLC block is configured to generate a second calibration signal for a second summing junction to apply to an image signal associated with one or more active pixels in the frame in a second phase.
摘要翻译：通常公开了多相黑电平校准（BLC）方法和系统。根据本发明的一个实施例，图像传感器包括像素传感器阵列，定时发生器和前端处理块。前端处理块还包括第一求和结，第一BLC块和第二BLC块。根据来自定时发生器的第一定时信号，第一BLC块被配置为基于与第一组黑色像素相关联的第一组经调整的黑电平信号来迭代地产生第一相位中的第一校准信号，改变累加器步骤和与第一目标黑色电平相关联的预定条件。根据来自定时发生器的第二定时信号，第二BLC块被配置为产生用于第二加法结的第二校准信号，以应用于与第二阶段中的帧中的一个或多个有源像素相关联的图像信号。

8. 发明申请

US20110085086A1 METHOD FOR ADAPTIVE NOISE REDUCTION AND APPARATUS THEREOF 审中-公开
标题翻译：自适应噪声减少方法及其设备
公开(公告)号：US20110085086A1
公开(公告)日：2011-04-14
申请号：US12577214
申请日：2009-10-12
申请人： Miaohong Shi , Amit Mittra
发明人： Miaohong Shi , Amit Mittra
IPC分类号： H04N5/217
CPC分类号： H04N9/646 , H04N5/208
摘要： An adaptive noise reduction method is for reducing chroma noise of pixels within a frame, wherein each pixel has a chroma value and a luma value. The adaptive noise reduction method includes: de-noising the chroma values of the pixels, without de-noising the luma values of the pixels.
摘要翻译：自适应噪声降低方法是用于降低帧内的像素的色度噪声，其中每个像素具有色度值和亮度值。自适应噪声降低方法包括：对像素的色度值进行去噪，而不消除像素的亮度值。

9. 发明授权

US08614639B1 Integrator ramp generator with DAC and switched capacitors 有权
标题翻译：具有DAC和开关电容器的积分器斜坡发生器
公开(公告)号：US08614639B1
公开(公告)日：2013-12-24
申请号：US13593520
申请日：2012-08-24
申请人： Ping Hung Yin , Satya Narayan Mishra , Amit Mittra
发明人： Ping Hung Yin , Satya Narayan Mishra , Amit Mittra
IPC分类号： H03M1/56
CPC分类号： H03M1/56
摘要： A ramp generator includes a digital-to-analog converter (DAC), a sampling capacitor, an integrator circuit, a polarity reversing switch selectively coupling first and second outputs of the DAC to a first side of the sampling capacitor, a first switch coupling a second side of the sampling capacitor to a reference voltage source, and a second switch coupling the second side of the sampling capacitor to an input of the integrator circuit.
摘要翻译：斜坡发生器包括数模转换器（DAC），采样电容器，积分器电路，选择性地将DAC的第一和第二输出端耦合到采样电容器的第一侧的极性反转开关，第一开关耦合采样电容器的第二侧到参考电压源，以及将采样电容器的第二侧耦合到积分器电路的输入的第二开关。

10. 发明申请

US20100141571A1 Image Sensor with Integrated Light Meter for Controlling Display Brightness 审中-公开
标题翻译：带集成光度计的图像传感器，用于控制显示亮度
公开(公告)号：US20100141571A1
公开(公告)日：2010-06-10
申请号：US12331426
申请日：2008-12-09
申请人： Tony Chiang , Amit Mittra
发明人： Tony Chiang , Amit Mittra
IPC分类号： G09G3/36
CPC分类号： G09G3/20 , G09G3/3406 , G09G2320/064 , G09G2330/021 , G09G2360/144
摘要： The present invention is directed to an image sensor with an integrated light meter that can be used to automatically adjust the display brightness based on ambient light in the environment. According to one embodiment, an automatic exposure (AE) control loop estimates the ambient light when the image sensor is imaging, and the image sensor measures the ambient light when the image sensor is not imaging.
摘要翻译：本发明涉及一种具有集成光度计的图像传感器，其可用于基于环境中的环境光自动调节显示器亮度。根据一个实施例，当图像传感器成像时，自动曝光（AE）控制环路估计环境光，并且当图像传感器不成像时，图像传感器测量环境光。

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