Image pickup system and image processing apparatus

An image pickup system comprising:

• a light source portion configured to sequentially emit first illumination light with a first wavelength band and second illumination light with a second wavelength band different from the first wavelength band;
• an image pickup portion configured to perform image pickup of return light from an object illuminated by illumination light emitted from the light source portion for each of predetermined periods and output an image pickup signal;
• an image generating portion configured to generate a first image corresponding to return light of the first illumination light and a second image corresponding to return light of the second illumination light, each of which corresponds to one field, based on the image pickup signal outputted from the image pickup portion, and sequentially output the first image and the second image;
• a synchronization processing portion configured to simultaneously output images corresponding to a plurality of fields outputted from the image generating portion, selectively assigning the images to a first channel corresponding to a red color of a display apparatus, a second channel corresponding to a green color of the display apparatus and a third channel corresponding to a blue color of the display apparatus;
• and
• a control portion configured to control the synchronization processing portion so as to set image assignment to and image update frequency for the first channel, the second channel and the third channel, respectively, based on one or more evaluation values acquired from the images generated by the image generating portion.