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local bildkompressionberechnungsverfahren and device for control of the antialiasing filterns in three-dimensional treatment of two-dimensional images
local bildkompressionberechnungsverfahren and device for control of the antialiasing filterns in three-dimensional treatment of two-dimensional images
A dynamically variable anti-aliasing filtering system calculates on a local basis the compression factors (Cf) present in an image that is being mapped from a two-dimensional source image through a three-dimensional space and into a two-dimensional target image, the apparatus implementing a linear equation of the form: Cf = A*Xs + B*Ys + C where, Xs and Ys are, respectively, the horizontal and vertical coordinates of pixels in the source image, and A, B and C are precalculated (each field or frame) constants that depend on the transform matrix function F. A total of four compression factors are required, one for control of horizontal luminance filtering, one for control of vertical luminance filtering, one for control of horizontal chrominance filtering and one for control of vertical chrominance filtering. Three dual accumulator circuits (20,30,40) are used to implement the linear equation in Xs and Ys for three different sets of A, B and C. One of these circuits measures horizontal chrominance compression, one vertical luminance compression and one compression due to skew angles. The outputs of these circuits are converted to logarithms and combined with each other and with the logarithms of multiplicative constants representing the ratios between calculated compression factors and the other required compression factor to produce those other compression factors. IMAGE
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机译:动态可变抗混叠滤波系统在本地计算图像中存在的压缩因子(Cf),该图像从二维源图像通过三维空间映射到二维目标图像中,实现以下形式的线性方程的设备:Cf = A * Xs + B * Ys + C其中,Xs和Ys分别是源图像中像素的水平和垂直坐标,并且A,B和C是预先计算的(取决于变换矩阵函数F的常数。总共需要四个压缩因子,一个用于控制水平亮度滤波,一个用于控制垂直亮度滤波,一个用于控制水平色度滤波,一个用于压缩。控制垂直色度过滤。三个双累加器电路(20、30、40)用于对A,B和C的三组不同的Xs和Ys实施线性方程。其中一个电路测量水平色度压缩,一个垂直亮度压缩和一个压缩倾斜角度。这些电路的输出被转换为对数,并且彼此相乘,并且与代表计算出的压缩因子与其他所需压缩因子之间的比率的乘法常数的对数相结合以产生那些其他压缩因子。 <图像>
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