The function performs the downsampling step of the Gaussian pyramid construction. First, it convolves the source image with the kernel.
该函数执行高斯金字塔结构下采样的步骤。首先，它与内核的源图像进行卷积。
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The image processing apparatus performs a downsampling process on image data, and supplies the image data after the downsampling process to a display device as image data for use in a display.