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    • 41. 发明授权
    • Image processing apparatus and image processing method
    • 图像处理装置和图像处理方法
    • US08511835B2
    • 2013-08-20
    • US13207551
    • 2011-08-11
    • Yosuke Sato
    • Yosuke Sato
    • G06T5/00
    • G06T3/0006
    • A CPU generates an image by performing inverse projection transformation for an input image by using an inverse matrix of a matrix which enlarges a size of the input image. When a position A on the input image is transformed into a position B on the generated image by the inverse projection transformation, the CPU obtains a ratio of a distance between pixels around the position B to a distance between pixels around the position A. The CPU calculates filter coefficients for a low-pass filter using a product of a Nyquist frequency of the input image and the ratio as a cutoff frequency. The CPU obtains a sum of results obtained by multiplying pixel values of pixels in a pixel array including the position A in the input image by the filter coefficients, as a pixel value at the position A in an image having undergone filter processing.
    • CPU通过使用放大输入图像的尺寸的矩阵的逆矩阵对输入图像进行逆投影变换来生成图像。 当通过逆投影变换将输入图像上的位置A转换为生成图像上的位置B时,CPU获得位置B周围的像素之间的距离与位置A周围的像素之间的距离的比率。CPU 使用输入图像的奈奎斯特频率与该比率作为截止频率的乘积来计算低通滤波器的滤波器系数。 CPU通过将包括输入图像中的位置A的像素阵列中的像素的像素值乘以滤波器系数而获得的结果的和作为经过滤波处理的图像中的位置A处的像素值。