There exist abundant multi_metal grains in over 5 000 m deep sea floor.In order to exploit the deep_sea floor mineral,we have taken some deep_sea floor pictures for study.Fig 1 shows a typical picture.There are dark metal grains pixels (the target objects),and grayer sands pixels (the background objects).Point light source is necessarily used when we take pictures for it is very dark in deep_sea floor.However,it causes serious non_uniform illumination in these pictures,which enlarges errors when measuring g...
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