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    • 5. 发明申请
    • AUTOMATIC IMAGE SHARPENING
    • 自动图像缩放
    • WO2013049653A1
    • 2013-04-04
    • PCT/US2012/058034
    • 2012-09-28
    • APPLE INC.
    • CRANDALL, Richard E.KLIVINGTON, Jason AlexisVAN DER MERWE, Rudolph
    • G06T5/00
    • G06T5/003
    • Systems, methods and computer program products are disclosed for automatic image sharpening. Automatic image sharpening techniques are disclosed that automatically bring a blurred image into focus. Techniques for reducing edge ringing in sharpened images are also disclosed. According to implementations, a computer-implemented method includes determining a normalized entropy of a first image, calculating a correlation target based on the normalized entropy, automatically determining a blur radius of a de-convolution kernel that causes a cosine of a first radial power spectrum of the kernel and a second radial power spectrum of a reconstruction of the first image to approximate the correlation target and generating a second image based on the blur radius.
    • 公开了用于自动图像锐化的系统,方法和计算机程序产品。 公开了自动图像锐化技术,自动使模糊图像成为焦点。 还公开了用于减少锐化图像中的边缘振铃的技术。 根据实施方式,计算机实现的方法包括:确定第一图像的归一化熵,基于归一化熵计算相关目标,自动确定导致第一径向功率谱的余弦的去卷积核的模糊半径 以及第一图像的重建的第二径向功率谱,以近似相关目标并基于模糊半径生成第二图像。