Chapter 2: Digital Image Fundamentals. Anterior chamber( 전방 ) Cornea( 각막 , 눈동자 ) Sclera Iris( 홍체 ) Lens( 수정체 ) Vitreous humor( 유리체 ) Fovea: 망막의 중심 Retina( 망막 ) Visual Axis. Chapter 2: Digital Image Fundamentals.
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Weber ratio: ∆I/I
- Bad brightness discrimination if Weber Ratio is large,
signal has continuous domain and range = analog
signal has discrete domain and range = digital
range of a signal.
sample of the signal.
e.g., 1, 8, 24 bit images, 16-bit audio.
f(x,y) = i(x,y)r(x,y)
0 < i(x,y) < ∞
0 < r(x,y) < 1
For the images with a large amount of detail only a few gray levels may be needed.
Path 8 neighbors m neighbors
, where (x0,y0) = (x,y) , (xn,yn) = (s,t) and (xi,yi) is adjacent to (xi-1,yi-1)
e.g., if only connectivity of pixels valued 1 is allowed. find the m-distance between p and p4
p3 p4 0 1 1 1 1 1
p1 p2 0 1 0 1 1 1
p 1 1 1
d = 2 d=3 d=4
H(af - bg) = aH(f) + bH(g)
where f and g are images and a and b are scalars
The sum of two images is identical to applying the operator to the image individually, muliplying the results by the constants, and adding those results.
An operator that fails the test of above equation is nonlinear. Ex) |af – bg|
Linear and Nonlinear Operations