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example figure explain of chapter 5

In Chapter5(Image Processing),there are many picture as Figure 5-1,5-2,5-4,5-5,etc ..,
all have 2 parts for any image,one is a real image as a car,another is up real image ,
it all have 5 circules and text as "20,30",could you explain it for more details? or tell me
where I can get some information? thanks inadvance!
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