Fig. 5. (Color online) (a)-(c) and (d)-(i) was the RGB pixel intensity distribution depending on the presence or absence of lens and with or without X-ray exposure. The only difference between (d)-(f) and (g)-(i) was the range of pixel intensity. (Without the lens), the narrow distribution of the RGB was understood as the high dynamic range (HDR) and saturation response of the CMOS sensor. (With the lens), the wide distribution of the RGB was understood as a result of the HDR, the response, and the pixel cross-talk phenomenon of the CMOS sensor.
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