______ 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.
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______ 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
The mask [-2,-1,0; -1,0,1; 0,1,2] can be used to detect the ( ) edge.
A. horizontal
B. vertical
C. 45º
D. 135º