空間頻率(100年度)

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目錄

[編輯] 一張圖片開始

  • Dr. Angry and Mr. Smile:Philippe G. Schyns*, Aude Oliva*

Image:Dr. Angry and Mr. Smile.jpg

[編輯] Local analysis

  • scale

Image:Local analysis.jpg

[編輯] Coarse scale and fine scale

  • Smile woman(coarse) and unsmile man(fine)

Image:Smile woman and unsmile man.jpg

  • puzzle in fine

Image:Puzzle in fine.jpg

  • Puzzle in coarse

Image:Puzzle in coarse.jpg

[編輯] What is the unit of scale?

  • Sinusoidal grating(正弦波柵)

Image:Sinusoidal grating.jpg

[編輯] What are gratings?

  • Four defining characteristics(特徵)
    • Saptial frequency(空間頻率)
      • Cycles per degree (visual angle)
        • 在一臂之遠圖5.6具有1.0cycle/degree
  • Contrast(對比)
    • 0~100%
      • Printing 約90%
  • Orientation(方位)
  • Spatial phase(空間相位)
[編輯] Spatial phase
  • phase在相加時效果

Image:Spatial phase.jpg

[編輯] Grating 的加成
  • 影像加成

Image:Grating.jpg

[編輯] 自然情境的加成
  • Coarse to fine

Image:Coarse to fine.jpg

[編輯] Gratings and contrast sensitivity

  • Measure performance(表現)

Image:Measure performance.png

[編輯] Cut-off frequency

  • Transfer function (遞變函數)

Image:Cut-off frequency.jpg

[編輯] Fourier analysis

  • Discrete Fourier Transform analysis 間斷傅立葉傳換分析

Image:Discrete Fourier Transform analysis.jpg

[編輯] Fourier synthesis(合成)

  • 分析的反向
    • 如:方波

Image:F21.jpg

Image:FF2.jpgImage:FF3.jpg

Image:FF4.pngImage:FF5.jpgImage:FF6.jpg

Image:FF7.pngImage:FF8.jpgImage:FF9.jpg

Image:FF10.png

Image:FF11.png

[編輯] Human contrast sensitivity function(對比敏感函數)

  • Contrast thresholds and contrast sensitivity function (CSF)

Image:CSF.jpg

[編輯] Structural basis of CSF

  • selective adaptation(選擇性適應)

Image:Selective adaptation.jpg

[編輯] Selective adaptation

  • 原理

Image:Selective adaptation 2.jpg

  • 回家實驗看看

Image:Selective adaptation 3.jpg

[編輯] Effect of spatial frequency

  • Low and high

Image:Effect of spatial frequency.jpg

  • Mosaic 馬賽克

Image:Mosaic.jpg

Image:Mosaic 3.jpg

[編輯] How to make mosaic

Image:Make mosaic.jpg

[編輯] Discrimination??

想想老師的照片!!

[編輯] Symmetry

  • 新瓶裝舊酒
    • low SF of fig 5.48

Image:Symmetry.jpg

[編輯] 補充美美的:)

  • CHUCK CLOSE

Image:CHUCK CLOSE 1.jpg

Image:CHUCK CLOSE 2.jpg Image:CHUCK CLOSE 3.jpg

[編輯] 補充資料

  • 舊文章 有關空間頻率
  • 請回去看一下
    • 有益無害:)