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 There is the national flag of Japan.Go digital (expressing numerically) of this picture.
   
 
 First divide it in regular section.This time divided it like simple.But in fact it is divided more finely.
Common picture is division at 2.5cm in 300th.This work called sampling.
       
 
 Next it assign by numerical value.This time is white is "zero",red is "three",other numerical value is "one" and "two".So assign numerical value at each section.This work called quantization.
       
 
  Last, gather numerical value date.This time is don't because difficult.But Original computer can handle at one and zero.So this numerical value change at one and zero.So it can go digital of image.