图像采样和量化的区别

要创建数字图像，我们需要将连续感知的数据转换为数字形式。
这个过程包括2个过程：

1. 采样：将坐标值数字化称为采样。
2. 量化：将幅度值数字化称为量化。

要将连续图像 f(x, y) 转换为数字形式，我们必须在坐标和幅度上对函数进行采样。

图像采样和量化的区别：

Sampling	Quantization
Digitization of co-ordinate values.	Digitization of amplitude values.
x-axis(time) – discretized.	x-axis(time) – continuous.
y-axis(amplitude) – continuous.	y-axis(amplitude) – discretized.
Sampling is done prior to the quantization process.	Quantizatin is done after the sampling process.
It determines the spatial resolution of the digitized images.	It determines the number of grey levels in the digitized images.
It reduces c.c. to a series of tent poles over a time.	It reduces c.c. to a continuous series of stair steps.
A single amplitude value is selected from different values of the time interval to represent it.	Values representing the time intervals are rounded off to create a defined set of possible amplitude values.