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Image Processing Environment

 Radiation Source 

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                                             ------------ --------------------------------------------------

                                            |                                    |                                                |

                                            ↓                                   ↓                                              ↓

                                        object                   self-luminous object          Transparent Object

                                                 \                                  |                                        /

                                                     \                              |                                    /

                                                        \                          ↓                               /    

                                                           ========================

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sensor 

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 analog signal 

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Digitizer

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Digital Computer

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