题目内容

The process of using a pattern of solid dots to simulate shades of gray is called ______ .

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______ operation takes a single input image into a single output image in such a way that each output pixel's gray level depends only upon the gray level of the corresponding input pixel.

______ are the means by which information is conveyed.

Each pixel has two attributes at least: ______ and gray-level value.

A digital image has 100×100 pixels, and its gray scale is [0 255]. The data quantity after Huffman encoding is 20000 bits, then the compression ratio is ( ) .

A. 2:1
B. 4:1
C. 8:1
D. 16:1