公开(公告)号：US20040207736A1

公开(公告)日：2004-10-21

申请号：US10761227

申请日：2004-01-22

申请人： NIKON CORPORATION

发明人： Masaru Muramatsu

IPC分类号： H04N005/202

CPC分类号： H04N5/2351 ,  H04N5/202 ,  H04N5/2352

摘要： An electronic camera includes an image-capturing element that captures a subject image and outputs image-capturing signals each corresponding to a pixel; and a control device that executes gradation correction on the image-capturing signals output by the image-capturing element. In the electronic camera, the image-capturing element is split into a plurality of pixel areas each containing a plurality of pixels; and the control device calculates average values of image-capturing signal values in the pixel areas, which are output by the image-capturing element prior to a shutter release, determines an exposure quantity and gradation characteristics based upon the average values having been calculated each in correspondence to one of the plurality of pixel areas, engages the image-capturing element to capture an image at the exposure quantity having been determined in response to the shutter release and executes gradation correction on image-capturing signals output by the image-capturing element in conformance to the gradation characteristics having been determined.

摘要翻译： 电子照相机包括拍摄被摄体图像并输出与像素对应的图像拍摄信号的摄像元件; 以及对由图像拍摄元件输出的图像拍摄信号执行灰度校正的控制装置。 在电子照相机中，图像拍摄元件被分成多个像素区域，每个像素区域包含多个像素; 并且控制装置计算在快门释放之前由图像拍摄元件输出的像素区域中的图像拍摄信号值的平均值，基于每个中计算出的平均值来确定曝光量和灰度特性 对应于多个像素区域中的一个像素区域，与图像拍摄元件接合以以响应于快门释放确定的曝光量捕获图像，并且对由图像捕获元件输出的图像捕获信号执行灰度校正 符合已经确定的灰度特性。

公开(公告)号：US20040130638A1

公开(公告)日：2004-07-08

申请号：US10740848

申请日：2003-12-22

发明人： Koichi Sakamoto

IPC分类号： H04N005/202

CPC分类号： H04N5/2355 ,  H04N5/235

摘要： An imaging apparatus is provided with an imaging element for outputting both a color signal of high-power image data and a color signal of low-power image data; gamma correcting means for gamma-correcting the high-power image data and for gamma-correcting the low-power image data; image synthesizing means for adding the high-power image data which has been gamma-corrected by the gamma correcting means to the low-power image data which has been gamma-corrected by the gamma correcting means, and also for multiplying the added image data by a total gain value in response to a scene so as to perform an image synthesizing operation; converting means for converting the synthesized image data synthesized by the image synthesizing means into both a luminance signal and a color difference signal; and saturation correcting means for performing a saturation correcting process operation with respect to the color difference signal in response to the luminance signal obtained by the converting means and a dynamic range of the synthesized image data.

摘要翻译： 一种成像装置设置有用于输出高功率图像数据的颜色信号和低功率图像数据的颜色信号的成像元件; 伽马校正装置，用于伽马校正大功率图像数据和伽马校正低功率图像数据; 图像合成装置，用于将由伽马校正装置进行了伽马校正的大功率图像数据与由伽马校正装置进行伽马校正的低功率图像数据相加，并且还将添加的图像数据乘以 响应于场景的总增益值，以执行图像合成操作; 转换装置，用于将由图像合成装置合成的合成图像数据转换成亮度信号和色差信号; 以及饱和校正装置，用于响应于由转换装置获得的亮度信号和合成图像数据的动态范围，对色差信号进行饱和校正处理操作。

公开(公告)号：US20030025837A1

公开(公告)日：2003-02-06

申请号：US10203006

申请日：2002-08-05

发明人： Knut Krogstad ,  Johan Henrik Liteskare

IPC分类号： H04N005/14 ,  H04N009/64 ,  H04N005/202 ,  H04N003/22 ,  H04N003/26

CPC分类号： H04N9/3147 ,  H04N5/74 ,  H04N9/12 ,  H04N9/31 ,  H04N9/3185 ,  H04N2005/745 ,  H04N2005/7466

摘要： Digital correction module for video projector where a correction module is provided to give a non-linear re-imaging of an image so that it is displayed correct on a non-ideal screen (curved screen) where a correction module is provided in each of a plurality of video projectors after a common image source in order to create a large, of several composite sub image, projected image of said image source. The correction module comprises a sequencer (1), a pixel write control (2), a parameter storage (7), a read address generator (13), a coefficient generator (5), a scaling generator (6), an adder (8), a pixel storage (3), a vertical mixer (9), a horizontal mixer (10) and a look up function means (12) for correction of differences in the border area of the image of the respective projectors such as geometry correction, soft transition tuning, vignette correction and gamma correction.

摘要翻译： 用于视频投影仪的数字校正模块，其中提供校正模块以给出图像的非线性重新成像，使得其在非理想屏幕（弯曲屏幕）上被正确显示，其中校正模块设置在 多个视频投影机经过一个共同的图像源，以创建一个大的，多个复合子图像，所述图像源的投影图像。 校正模块包括定序器（1），像素写入控制（2），参数存储器（7），读取地址生成器（13），系数生成器（5），缩放生成器（6） 8），像素存储器（3），垂直混合器（9），水平混合器（10）和查找功能装置（12），用于校正各个投影仪的图像的边界区域的差异，例如几何 校正，软转换调谐，晕影校正和伽马校正。

公开(公告)号：US20030012448A1

公开(公告)日：2003-01-16

申请号：US09843834

申请日：2001-04-30

发明人： Ronny Kimmel ,  Michael Elad ,  Doron Shaked ,  Renato Keshet ,  Irwin Sobel

IPC分类号： G06T003/40 ,  G06T005/00 ,  G06T005/50 ,  H04N001/407 ,  H04N005/202 ,  H04N009/69 ,  H04N001/60

CPC分类号： G06K9/4661 ,  G06T5/007 ,  G06T2207/10024 ,  G06T2207/20016

摘要： A system and a method solve the estimation problem of finding reflectance R and illumination L. The system and method to solve a functional of the unknown illumination L such that a minimum of the functional is assumed to yield a good estimate of the illumination L. Having a good estimate of the illumination L implies a good estimate of the reflectance R. The functional uses a variational framework to express requirements for the optimal solution. The requirements include: 1) that the illumination L is spatially smooth; 2) that the reflectance values are in the interval null0,1null nullthus, when decomposing the image S, the solution should satisfy the constraint L>S; 3) that among all possible solutions, the estimate of the illumination L should be as close as possible to the image S, so that the contrast of the obtained R is maximal; and 4) that the reflectance R complies with typical natural image behavior (e.g., the reflectance is piece-wise smooth).

摘要翻译： 一种系统和方法解决了找到反射率R和照明L的估计问题。解决未知照明L的功能的系统和方法，使得假定功能的最小值产生对照明L的良好估计。具有 对照明L的良好估计意味着对反射率R的良好估计。功能使用变分框架来表达对最优解的要求。 要求包括：1）照明L在空间上平滑; 2）反射率值在[0,1]之间，当分解图像S时，溶液应满足约束L> S; 3）在所有可能的解决方案中，照明L的估计应尽可能接近图像S，使得所获得的R的对比度最大; 和4）反射率R符合典型的自然图像行为（例如，反射率是分段平滑的）。

公开(公告)号：US20020036716A1

公开(公告)日：2002-03-28

申请号：US09803660

申请日：2001-03-12

发明人： Keiichi Ito ,  Atsuhisa Kageyama ,  Nobutaka Okada ,  Katsuya Ishikawa ,  Hidetoshi Suzuki ,  Hisao Kunitani ,  Yuki Kakuya

IPC分类号： H04N005/202

CPC分类号： H04N5/202

摘要： An appropriate correction quantity is obtained for a video luminance signal on an individual video basis with a characteristic value, like the maximum or average value, of the luminance signal taken into account, thereby performing gray scale correction more effectively. A dynamic gamma correction apparatus for performing a correction on a video luminance signal includes: a correction start point control section for obtaining a correction start point, which is a lower limit of a given correction range, in accordance with a characteristic value of the luminance signal; a gamma correction quantity calculating section for obtaining a provisional correction quantity for the luminance signal to be corrected using the correction start point and the luminance signal; a gamma correction gain control section for obtaining a gain for the provisional correction quantity in accordance with the characteristic value of the luminance signal; a multiplier for obtaining a product of the provisional correction quantity and the gain as a gamma correction quantity; and an adder for obtaining a sum of the luminance signal and the gamma correction quantity and outputting the sum. The correction start point and the gain for the provisional correction quantity are controllable in accordance with the characteristic value of the luminance signal. Thus, an appropriate gamma correction quantity can be obtained as a final correction quantity.

摘要翻译： 通过考虑到亮度信号的特性值（如最大值或平均值），在单个视频基础上获得适当的校正量，从而更有效地执行灰度校正。 用于对视频亮度信号执行校正的动态伽马校正装置包括：校正开始点控制部分，用于根据亮度信号的特征值获得作为给定校正范围的下限的校正开始点 ; 伽马校正量计算部分，用于使用校正开始点和亮度信号获得要校正的亮度信号的临时校正量; 伽马校正增益控制部分，用于根据亮度信号的特征值获得临时校正量的增益; 用于获得临时校正量和增益的乘积作为伽马校正量的乘法器; 以及用于获得亮度信号和伽马校正量之和并输出该和的加法器。 校正开始点和临时校正量的增益根据亮度信号的特征值是可控的。 因此，可以获得适当的伽马校正量作为最终校正量。

公开(公告)号：US20040080631A1

公开(公告)日：2004-04-29

申请号：US10470555

申请日：2003-07-30

发明人： Ryuichiro Tominaga ,  Yukio Mori ,  Seiji Okada

IPC分类号： H04N005/202 ,  H04N005/335 ,  H04N009/68

CPC分类号： H04N5/20 ,  H04N5/208

摘要： The present invention relates to an image processing circuit for performing contrast highlighting and smoothing of an image-related apparatus such as a color camera or a monitor. The image processing circuit according to the present invention comprises first means for calculating an average luminance in a portion surrounding a target pixel, and second means for controlling input-output characteristics on the basis of the average luminance calculated by the first means, to control the luminance of the target pixel.

摘要翻译： 本发明涉及一种图像处理电路，用于执行诸如彩色照相机或监视器之类的图像相关装置的对比度高亮和平滑。 根据本发明的图像处理电路包括用于计算围绕目标像素的部分中的平均亮度的第一装置，以及用于基于由第一装置计算的平均亮度来控制输入 - 输出特性的第二装置， 目标像素的亮度。

公开(公告)号：US20030156226A1

公开(公告)日：2003-08-21

申请号：US10076352

申请日：2002-02-15

发明人： Jeroen Hubert Christoffel Jacobus Stessen ,  Andrea Maccato ,  Mitchell Oslick

IPC分类号： H04N005/202

CPC分类号： H04N5/202

摘要： A gamma correction circuit for correcting a digital video signal, the circuit comprising first (6) and second (8) lookup tables for storing discrete output intensity data and the associated slope data of a non-linear transfer function, respectively, for each of the discrete input video signal intensities, an adder (10) having a first input connected to the output of the first lookup table, a multiplier (12) having a first input connected to the output of the second look-up table (8), characterized by a quantizer (4) for providing the most significant bits of the incoming video signal to address the first (6) and second (8) lookup tables and to transfer the corresponding output intensity data to the adder (10) and the associated slope data to the multiplier (12), the quantizer (4) transmitting the remaining least significant bits of the input video signal to the second input of the multiplier (12), the multiplier (12) multiplying the slope data with the remaining least significant bits and feeding the multiplication result to the second input of the adder (10), the adder (10) adding the output intensity data and the multiplication result to generate a corrected video signal.

摘要翻译： 一种用于校正数字视频信号的伽马校正电路，该电路包括分别用于存储离散输出强度数据和非线性传递函数的相关斜率数据的第一（6）和第二（8）查找表， 离散输入视频信号强度，具有连接到第一查找表的输出的第一输入的加法器（10），具有连接到第二查找表（8）的输出的第一输入的乘法器（12），其特征在于 通过量化器（4），用于提供输入视频信号的最高有效位以寻址第一（6）和第二（8）查找表，并将相应的输出强度数据传送到加法器（10）和相关联的斜率数据 到乘法器（12），量化器（4）将输入视频信号的剩余最低有效位传送到乘法器（12）的第二输入，乘法器（12）将斜率数据与剩余的最低有效位 并将相乘结果馈送到加法器（10）的第二输入端，加法器（10）将输出强度数据和相乘结果相加以产生经校正的视频信号。

公开(公告)号：US20030128299A1

公开(公告)日：2003-07-10

申请号：US10039208

申请日：2002-01-04

发明人： Terrence J. Coleman ,  Kenneth C. George

IPC分类号： H04N005/202

CPC分类号： G09G5/10 ,  G09G2320/0276 ,  H04N5/202

摘要： A method and system are disclosed that correct pixel values for output on a video display utilizing gamma correction. The method provides improved gamma correction by determining a first range of pixel values to be displayed on the video display and then determining a second range of pixel values to be displayed on the same display. Next, the method determines a first level of gamma correction to be provided for the first range of pixel values. This first level of gamma correction is provided at a first level of precision. Next, the method provides a second level of gamma correction to the second range of pixel values at a second level of precision. The second level of precision is different than that of the first level and is typically less than the first level.

摘要翻译： 公开了一种使用伽马校正来校正在视频显示器上输出的像素值的方法和系统。 该方法通过确定要在视频显示器上显示的像素值的第一范围，然后确定要在同一显示器上显示的像素值的第二范围来提供改进的伽马校正。 接下来，该方法确定要为第一像素值范围提供的伽马校正的第一级。 以第一级精度提供第一级伽马校正。 接下来，该方法以第二精度水平向第二像素值范围提供第二级伽马校正。 第二级精度与第一级不同，通常小于第一级。

公开(公告)号：US20020130975A1

公开(公告)日：2002-09-19

申请号：US09809398

申请日：2001-03-15

申请人： Eastman Kodak Company

发明人： Jian Yang ,  Michael E. Miller

IPC分类号： H04N017/00 ,  H04N017/02 ,  H04N005/202

CPC分类号： G09G5/003 ,  G09G2320/0276 ,  G09G2320/0606 ,  G09G2320/0673 ,  G09G2320/0693 ,  H04N5/202 ,  H04N17/02 ,  H04N17/04

摘要： A method of characterizing a video display, including the steps of providing a mathematical model of the display that relates code values to luminance output of the display, the model having a parameter that characterizes the display; displaying a reference patch and a test patch simultaneously on the display, the reference patch having a reference brightness produced by one or more luminances and the test patch having an test brightness produced by rapidly switching back and forth between two luminances; observing the display while varying one of the luminances keeping the others fixed, until the apparent brightness of the reference patch matches the apparent brightness of the test patch, and recording the code values employed to produce the luminances when a best match is made, and using the mathematical model, and the recorded code values to determine the value of the parameter that characterizes the display.

摘要翻译： 一种表征视频显示的方法，包括以下步骤：提供将代码值与显示器的亮度输出相关联的显示的数学模型，该模型具有表征显示的参数; 在显示器上同时显示参考贴片和测试片，所述参考贴片具有由一个或多个亮度产生的参考亮度，并且所述测试贴片具有通过在两个亮度之间来回快速切换而产生的测试亮度; 观察显示器，同时改变保持其他固定的亮度之一，直到参考贴片的表观亮度与测试贴片的表观亮度相匹配，并且记录当进行最佳匹配时用于产生亮度的代码值，并且使用 数学模型和记录的代码值，以确定表征特征的参数的值。

公开(公告)号：US20020130960A1

公开(公告)日：2002-09-19

申请号：US10085540

申请日：2002-02-27

发明人： Makoto Fujimoto

IPC分类号： H04N005/202

CPC分类号： H04N5/3572 ,  H04N5/202

摘要： The present invention discloses an imaging apparatus constructed as follows. The imaging apparatus picks-up a subject image formed by a imaging optical unit, and comprises an image pickup device for photoelectrically converting a subject image, a memory for storing gamma property data of the image pickup device and light quantity distribution data of incident light in accordance with pixel positions on the image pickup device; and a correcting circuit for correcting image signals outputted from each pixel of the image pickup device based on the gamma property data and light quantity distribution data that are stored in the memory. Thereby, a drop in peripheral light quantity can be electrically corrected while reflecting the gamma property of the image pickup device without an increase in noise, whereby a high-quality image accurately reproducing the actual brightness distribution in a shooting range can be obtained.

摘要翻译： 本发明公开了如下构成的摄像装置。 成像装置拾取由成像光学单元形成的被摄体图像，并且包括用于对目标图像进行光电转换的图像拾取装置，用于存储图像拾取装置的伽马属性数据的存储器和入射光的光量分布数据 根据图像拾取装置上的像素位置; 以及校正电路，用于根据存储在存储器中的伽马属性数据和光量分布数据来校正从图像拾取装置的每个像素输出的图像信号。 因此，可以在不增加噪声的同时反映摄像装置的伽马特性的同时电校正周边光量的下降，从而可以获得精确地再现拍摄范围内的实际亮度分布的高质量图像。