运用matlab对灰度图进行缩放一定比例的缩放。对图像进行缩小用到两种方法：其一直接消除像素进行缩放处理；其二先进行初步 的图像平滑滤波，然后消除像素。平滑滤波用于模糊处理，可以出去细节并降低噪声。-Write MATLAB functions to down-sample one grayscale image from original size to the

given output size through two different methods: a) directly elimination of pixels and b)

preliminary image smoothing before elimination of pixels.

Process the given test images “Living Room” with scale-down coefficients: 2:1, 4:1, 8:1 and

16:1.