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    • 1. 发明申请
    • PERCEPTUAL IMAGE DISTORTION EVALUATION
    • PERCEPTUAL图像失真评估
    • WO1998030979A1
    • 1998-07-16
    • PCT/FR1997002222
    • 1997-12-05
    • TELEDIFFUSION DE FRANCEFRANCE TELECOMBLIN, Jean, Louis
    • TELEDIFFUSION DE FRANCEFRANCE TELECOM
    • G06T09/00
    • G06T9/00
    • The invention concerns a method for evaluating perceptual image quantization distortion in a fixed image. This method takes into account the specific characteristics of the visual processing of an image to obtain the most accurate evaluation, based on the difference between the reference image (9) and the tested image (8) divided into a plurality of image blocks (I). On the basis of each image block (I), the method consists in computing (1) the luminance point Li,j and the adaptation luminance La, in a non-linear processing (2; 10) and in computing the intermediate contrast (2; 11) DELTA Li,j* = Li,j*-La*, in filtering it (3; 12) according to the spatial orientation of the frequencies, in separating (4;13) the frequencies according to orientation, in a second non linear processing (5; 14), and by computing the point-to-point difference weighted by frequency spatial orientation between the obtained intermediate contrast values, in deducing therefrom the value for each tested image block, the local perceptual contrast distortion.
    • 本发明涉及一种用于评估固定图像中的感知图像量化失真的方法。 该方法基于分割为多个图像块(I)的参考图像(9)和被测图像(8)之间的差异,考虑图像的可视处理的特定特征以获得最准确的评估, 。 在每个图像块(I)的基础上,该方法包括在非线性处理(2; 10)和计算中间对比度(2)中计算(1)亮点Li,j和适应亮度La ; 11)DELTA Li,j * = Li,j * -La *,根据频率的空间取向在根据取向分离(4; 13)频率时对其进行滤波(3; 12) 通过计算由获得的中间对比度值之间的频率空间取向加权的点对点差异,从而推算出每个测试图像块的值,本地感知对比度失真。