10
Biomedical Signal and Image Processing
50
100
150
200
250
300
350
400
450
500
50
100
150
200
250
300
350
400
450
500
(a)
50
100
150
200
250
300
350
400
450
500
50
100
150
200
250
300
350
400
450
500
(b)
FIGURE 1.4 Effect of gray-level range on image resolution. (a) Range 0–255, (b) range 0–63.