空間頻率(100年度)
出自KMU Wiki
一張圖片開始
- Dr. Angry and Mr. Smile:Philippe G. Schyns*, Aude Oliva*
Local analysis
- scale
Coarse scale and fine scale
- Smile woman(coarse) and unsmile man(fine)
- puzzle in fine
- Puzzle in coarse
What is the unit of scale?
- Sinusoidal grating(正弦波柵)
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
- Cycles per degree (visual angle)
- Saptial frequency(空間頻率)
- Contrast(對比)
- 0~100%
- Printing 約90%
- 0~100%
- Orientation(方位)
- Spatial phase(空間相位)
Spatial phase
- phase在相加時效果
Grating 的加成
- 影像加成
自然情境的加成
- Coarse to fine
Gratings and contrast sensitivity
- Measure performance(表現)
Cut-off frequency
- Transfer function (遞變函數)
Fourier analysis
- Discrete Fourier Transform analysis 間斷傅立葉傳換分析
Fourier synthesis(合成)
- 分析的反向
- 如:方波
Human contrast sensitivity function(對比敏感函數)
- Contrast thresholds and contrast sensitivity function (CSF)
Structural basis of CSF
- selective adaptation(選擇性適應)
Selective adaptation
- 原理
- 回家實驗看看
Effect of spatial frequency
- Low and high
- Mosaic 馬賽克
How to make mosaic
Discrimination??
Symmetry
- 新瓶裝舊酒
- low SF of fig 5.48
補充美美的:)
- CHUCK CLOSE
補充資料
- 舊文章 有關空間頻率
- 請回去看一下
- 有益無害:)