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    • 5. 发明授权
    • Adaptive histogram equalization for images with strong local contrast
    • 具有强局部对比度的图像的自适应直方图均衡
    • US07822272B2
    • 2010-10-26
    • US11618030
    • 2006-12-29
    • Zhichun Lei
    • Zhichun Lei
    • G06K9/00H04N5/14
    • G06T5/40G06T5/008G06T2207/20012
    • The present invention relates to a method, apparatus and computer program product for contrast enhancement of images based on adaptive histogram equalization. In particular it relates to preventing adaptive histogram equalization from causing fading artifacts and object extension artifacts. An adaptive histogram equalization method is provided comprising the steps of dividing an image into regions of pixels, determining structures of local pixel value differences of a predefined strength of the image, building for every region a histogram of the pixel values based on the determined structures of local pixel value differences and mapping pixel values of each region based on the histogram corresponding to the region.
    • 本发明涉及一种基于自适应直方图均衡的图像对比度增强的方法,装置和计算机程序产品。 特别地,它涉及防止自适应直方图均衡引起衰落伪像和对象延伸伪像。 提供了一种自适应直方图均衡方法,包括以下步骤:将图像划分为像素区域,确定图像的预定强度的局部像素值差异的结构,基于所确定的结构的结构为每个区域构建像素值的直方图 局部像素值差异,并且基于对应于该区域的直方图来映射每个区域的像素值。
    • 8. 发明申请
    • Method for pre-processing image data
    • 预处理图像数据的方法
    • US20050062897A1
    • 2005-03-24
    • US10902560
    • 2004-07-29
    • Zhichun Lei
    • Zhichun Lei
    • G06T5/00H04N5/20H04N9/73H04N3/22
    • G06T5/006H04N5/20H04N9/73
    • A method for pre-processing image data is suggested wherein a step of pre-processing (S2) received primary image data (PID) is performed by applying a pre-distortion operation (PDO) to said primary image data (PID) so as to obtain secondary image data (SID). Said pre-distortion operation (PDO) is chosen to correspond to an inverse (IDO) of a distortion operation (DO) of a display process (S4) to be used for displaying said secondary image data (SID) to therefore compensate an non-uniformity of said image generation process (S4) with respect to image data without pre-distortion. The non-uniformity correction can be included within or be performed together with an image processing function.
    • 建议预处理图像数据的方法,其中通过对所述主图像数据(PID)应用预失真操作(PDO)来执行预处理(S2)接收的主图像数据(PID)的步骤,以便 获得次要图像数据(SID)。 所述预失真操作(PDO)被选择为对应于要用于显示所述次要图像数据(SID)的显示处理(S4)的失真操作(DO)的反向(IDO),从而补偿非失真 所述图像生成处理(S4)相对于没有预失真的图像数据的均匀性。 非均匀性校正可以包括在图像处理功能中或与图像处理功能一起执行。