专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US06204940B1 Digital processing of scanned negative films 失效
标题翻译：扫描底片的数字处理
公开(公告)号：US06204940B1
公开(公告)日：2001-03-20
申请号：US09080054
申请日：1998-05-15
申请人： Qian Lin , Malcolm Rix , Daniel R. Tretter , Michael Stokes
发明人： Qian Lin , Malcolm Rix , Daniel R. Tretter , Michael Stokes
IPC分类号： G03F310
CPC分类号： H04N1/4072 , H04N1/407 , H04N1/6027 , H04N9/11
摘要： A process and apparatus is described to improve the digital processing of scanned negative films by reducing the amount of time necessary to perform the process and by increasing the robustness and quality of the images produced. These benefits are achieved by a process of color inversion, white point and black point mapping, and midtone adjustment. White and black mapping increases the dynamic range of the image, as well as removes the color cast of the negative film. A backlit image postprocessing algorithm can be employed which uses heuristics to identify backlighted situations, which are then brightened using a nonlinear power mapping. A midtone adjustment can include the sub-steps of contrast reduction and color adjustment. Contrast reduction reverses the film exposure characteristics. Color adjustment removes the remaining color cast in the midtone region of the image, and obtains the correct brightness. Starting from images with poor contrast and color cast, the system automatically looks for the appropriate correction parameters to produce images with vivid color and good contrast. This is achieved without rescanning or retaking the picture. One implementation, using one dimensional look-up-tables, is very efficient.
摘要翻译：描述了一种处理和装置，以通过减少执行该过程所需的时间量以及增加产生的图像的鲁棒性和质量来改进扫描的底片的数字处理。这些优点通过颜色反转，白点和黑点映射以及中间调节调整来实现。白色和黑色的绘制增加了图像的动态范围，并且消除了底片的色偏。可以使用背光图像后处理算法，其使用启发式来识别背光状态，然后使用非线性功率映射来增亮。中间调节可以包括对比度降低和颜色调整的子步骤。对比度降低反转胶片曝光特性。颜色调整可以删除图像中间色调区域中的剩余颜色，并获得正确的亮度。从对比度和色彩差的图像开始，系统会自动寻找适当的校正参数，以生成鲜艳色彩和良好对比度的图像。这是在不重新扫描或重新拍摄照片的情况下实现的。使用一维查找表的一个实现是非常有效的。

IPRDB

热门服务

关于我们

友情链接

联系方式