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    • 1. 发明授权
    • Method for electronic reduction of the contrast of video images as early as during recording
    • 在记录过程中尽早电子缩小视频图像的对比度的方法
    • US06529243B1
    • 2003-03-04
    • US09048926
    • 1998-03-26
    • Werner Ritter von SteinWolfgang Zahn
    • Werner Ritter von SteinWolfgang Zahn
    • H04N5225
    • H04N5/235H04N5/142H04N5/20H04N5/243H04N9/045H04N2209/049
    • A method for electronic reduction of the contrast of video images as early as during recording provides electronic brightening of the shaded zones of a video image in a camera as early as during recording while maintaining the detail contrast even in the brightened regions. A blurred diffuse image of the motif is produced on the image sensor in the camera by the objective and the electronically alterable diffusion element, and is stored in a frame store. The black and white contrast of the mask is determined in the evaluation circuit, and a control variable is generated pixel-by-pixel from this. The focused video image which is subsequently produced on the image sensor when the diffusion element is switch to be crystal-clear is read and is amplified or attenuated pixel-by-pixel such that the shadowed parts are brightened and/or the bright zones are attenuated.
    • 一种用于在记录期间电子降低视频图像的对比度的方法提供了在记录期间在摄像机中视频图像的阴影区域的电子增亮,同时即使在增亮区域中也保持细节对比度。 通过物镜和电子可变扩散元件在摄像机的图像传感器上产生模糊的模糊漫射图像,并存储在帧存储器中。 在评估电路中确定掩模的黑白对比度,并从其中逐像素地生成控制变量。 读取扩散元件切换为清晰的随后在图像传感器上产生的聚焦视频图像,并逐个像素地放大或衰减,使得阴影部分变亮和/或亮区域被衰减 。
    • 3. 发明授权
    • Method for improving the contrast reproduction of digitized images
    • 用于改善数字化图像的对比度再现的方法
    • US06720992B1
    • 2004-04-13
    • US09430459
    • 1999-10-29
    • Wolfgang ZahnWerner Ritter von Stein
    • Wolfgang ZahnWerner Ritter von Stein
    • H04N904
    • H04N1/6027G06T5/007
    • The optimum reproduction of high-contrast motifs in digital imaging technology is limited owing to the limited dynamic range of present-day image sensors. The reproduction of high-contrast motifs is intended to be improved using active pixel image sensors. The sensitivity of the sensor pixels is adapted, controlled in an analogous manner to the blurred brightness distribution in the motif, to ensure that the dark and bright image regions of the motif are also reproduced, well illuminated, without any loss of detailed contrast. This results in a particularly natural and balanced image impression. This method may be used in numerous fields for digital image processing.
    • 由于目前图像传感器的动态范围有限,数字成像技术中高对比度图案的最佳再现受到限制。 使用有源像素图像传感器旨在改进高对比度图案的再现。 传感器像素的灵敏度以与图案中的模糊亮度分布类似的方式进行调整,以确保图案的暗和亮的图像区域也被再现,良好照明,而没有任何损失的详细对比度。 这导致了一种特别自然和平衡的图像印象。 该方法可用于数字图像处理的多个领域。
    • 7. 发明授权
    • Printing of color film
    • 印刷彩膜
    • US5781276A
    • 1998-07-14
    • US799131
    • 1997-02-13
    • Wolfgang ZahnManfred FuersichKlaus-Peter Hartmann
    • Wolfgang ZahnManfred FuersichKlaus-Peter Hartmann
    • G03C5/02G03C7/00G03B27/32
    • G03C2007/3043G03C5/02G03C7/00
    • An exposure of a color film is scanned at a multiplicity of points in each of the primary colors. The color compositions of the points are evaluated to identify color compositions characteristic of skin tones, and a color space is created based on these color compositions. Scanned points whose color compositions lie in the color space undergo an examination to ascertain whether or not they actually represent skin. The examination is concerned primarily with the positions of such scanned points within the exposure and secondarily with density differences between the points and specified zones of the exposure, density differences between adjacent points, and the nature of any groups formed by the points, only those scanned points which actually represent skin are considered when calculating the amount of copy light for the exposure in each primary color.
    • 以每种原色的多个点扫描彩色胶片的曝光。 评估点的颜色组成以识别皮肤色调的特征的颜色组合,并且基于这些颜色组合产生颜色空间。 其颜色组成位于颜色空间的扫描点进行检查,以确定它们是否实际代表皮肤。 检查主要涉及曝光中这些扫描点的位置,其次与曝光的点和指定区域之间的密度差异,相邻点之间的密度差异以及由点形成的任何组的性质,仅扫描的 在计算每种原色曝光的复印光量时,会考虑实际代表皮肤的点。
    • 9. 发明授权
    • Method of copying color exposures
    • 复印彩色曝光的方法
    • US4566786A
    • 1986-01-28
    • US717323
    • 1985-03-29
    • Manfred FursichHelmut TreiberBerthold FerggGunter FindeisWolfgang Zahn
    • Manfred FursichHelmut TreiberBerthold FerggGunter FindeisWolfgang Zahn
    • G03B27/73G03C5/08G03B27/32G03B27/80
    • G03B27/73
    • A film has a series of exposed and developed negatives. Each negative is scanned at a multiplicity of regions, and the densities of each region in the three primary colors are measured. A blue/red density differential is derived for each region by subtracting the red density of a respective region from its blue density. The neutral density of each region is calculated, and every region is assigned a coordinate on a plot of blue/red density differential versus neutral density. According to one embodiment, the blue/red density differential for each region having a neutral density equal to or greater than a limiting value is then subtracted from the blue/red density differential given by a characteristic curve for the film. The differences obtained in this manner are analyzed, at least for selected negatives, and the minimum difference for each selected negative is determined. The region corresponding to the minimum difference is that region of a negative having the maximum blue density. The blue/red density differential for the region of maximum blue density is compared with a pair of reference values derived from respective reference curves representing blue/red density differential as a function of neutral density. Based on the results of this comparison, each selected negative is classified as to whether it was exposed by artificial light or natural light, and is assigned an appropriate color correction factor for copying. Another embodiment is employed if the characteristic curve is found to lie near one of the reference curves. Here, the steps of subtracting blue/red density differentials and analyzing the resulting differences are omitted, and all negatives of the film are immediately classified as having been exposed by artificial light.
    • 一部电影有一系列暴露和发展的负面影片。 每个负数在多个区域被扫描,并且测量三原色中每个区域的密度。 通过从其蓝色密度减去相应区域的红色密度,为每个区域导出蓝色/红色浓度差异。 计算每个区域的中性密度,并且在蓝色/红色密度差异与中性密度的图上分配每个区域的坐标。 根据一个实施例,然后从具有等于或大于极限值的中性密度的每个区域的蓝/红密度差被从由薄膜的特性曲线给出的蓝/红密度差减去。 分析以这种方式获得的差异,至少对于所选择的否定,并确定每个所选阴性的最小差异。 对应于最小差的区域是具有最大蓝色密度的负区域。 将最大蓝色密度区域的蓝色/红色浓度差异与从表示蓝色/红色密度差异的各个参考曲线导出的一对参考值作为中性密度的函数进行比较。 基于该比较的结果,每个选择的阴性被分类为是否被人造光或自然光曝光,并且被赋予适当的颜色校正因子进行复制。 如果发现特征曲线位于一个参考曲线附近,则采用另一个实施例。 这里,省略减去蓝色/红色浓度差异并分析所得差异的步骤,并且将膜的所有负片立即分类为已经通过人造光曝光。