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a problem about the image data captured from ccd sensor

 

I'm now using a ccd sensor in my project, the captured stream flows like this:ccd->ad->fpga->arm, and the image which i get has bad contrast, no matter dark or bright,the intensity always be the area of about 105 to 225.

Is this situation natural,the ccd sensor lead to this?

anybody tell me,plz

thx

the image and its histogram as follows:

sry,the image is big,forget to convert it.