??????????(Pixel)? - PowerPoint PPT Presentation

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??????????(Pixel)?

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Title: PowerPoint Presentation Last modified by: home Created Date: 1/1/1601 12:00:00 AM Document presentation format: Other titles – PowerPoint PPT presentation

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Tags: histogram | image | pixel

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Title: ??????????(Pixel)?


1
????????
  • 3.1 ????
  • 3.2 ???????
  • 3.3 ????????????
  • 3.4 ???????
  • 3.5 ???????
  • 3.6 ????????
  • 3.7 ???????

2
3.1 ????
  • 1.???????
  • ??????????????????????????????
  • 2.????????
  • ??????????(Pixel)?
  • g(x,y) T f(x,y)
  • (1)T???????????(e.g. Mapping)
  • ??(Mapping)
  • g(x,y) T( r )
  • ????(Contrast stretching)
  • ??(Thresholding)
  • ????(Binary Image)

3
(2) T???????????? Tf(x,y) w1 f(x-1,y-1)
w2 f(x-1,y) w3 f(x-1,y1) w4 f(x,y-1)
w5 f(x,y) w6 f(x,y1) w7 f(x1,y-1) w8
f(x1,y) w9 f(x1,y1) ??(Mask),
???(Filter), Kernels,Templates, Windows
4
3.2 ???????
  • ????
  • ??????0, L-1?????????
  • s L - 1 r
  • ????
  • ?????????
  • s c log( 1 r )
  • ????
  • (Power-Law Transform)
  • ?????????

5
3.3 ????????????
  • ?????p(rk) nk / n

6
  • ????????(Histogram Equalization)
  • 1.??
  • s T(r), 0 ? r ? 1
  • ???????
  • (1)T(r) ?0?r?1?????????????
  • (2)0?T(r)?1 ?0?r?1?
  • ????r T-1(s) 0 ? s ? 1

7
  • 2.??????????
  • ?T(r)?????????????
  • ???????????T(r)
  • ??w????????,?????????????????(Cumulative
    Distribution Function, CDF)

8
  • ???s?r????
  • ???????????????dr/ds,??
  • Ps(s)????s??????????,?????????????????????????????
    ??,????????????

9
  • 3.??????????????
  • ????

10
  • ????????????
  • 1.????
  • ?Pk(r)?Pz(z)???????????????
  • ???????

11
  • 2.?????????
  • ??????????

12
  • 3.????
  • (1)?????????????
  • (2)??Sk?????????????????
  • (3)??Vk???????????Pz(z)???????G(z)?
  • (4)?????????Sk??????????Zk ?
  • (5)??(2)??(4)???????,????????????????rk???Sk
    ,??Sk ???Zk?????

13
  • ???????????????

14
3.4 ???????
  • ????(Image Subtraction)
  • g(x,y) f(x,y) - h(x,y)
  • ????(Image Averaging)
  • ??g(x, y)????????????, g(x, y) f(x, y) ? (x,
    y)??f(x, y)?????? (x, y)???
  • ????

15
  • ????(Image Averaging)

16
3.5 ???????
17
  • ?????????(Convolution Mask)
  • ???????
  • ???????
  • ????????
  • ?????????
  • ??????
  • ?????

18
3.6 ????????
  • ????????
  • ??????????????????????
  • ??????
  • NxM?????????????

19
  • ????????(Order-statistics Filters)
  • ????????
  • ??????(Median Filter)??????????
  • ????????????????
  • ?????????????

20
3.7 ???????
  • ????
  • ????
  • ????

21
  • ?????????

22
  • ?????????

23
  • ?????????-??
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