Spatial vision i revised jan 25 2011
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Transcript of Spatial vision i revised jan 25 2011
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Definition of Contrast
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Fourier Analysis
• Square wave = Sum of sine waves• Square wave = Fundamental sine wave +
harmonics• Fundamental sine wave is a wave with the
same frequency as the square wave• Third harmonic is a sine wave with 3 times the
square wave• Fifth harmonic is a sine wave with 5 times the
frequency of the square wave
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Modulation Transfer Function
• Object Contrast-> Lens -> Image contrast
• MTF = Image Contrast/ Object Contrast
• MTF = 1.0 for an ideal lens (or system)MTF is determined by frequency to obtain a
graph.
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Modulation Transfer Function (MTF)Frequency Object Contrast Image Contrast MTF
2 10 8 0.805 9 7.5 0.838 8.7 6.3 0.72
10 7.5 5.2 0.6915 6.3 3.8 0.6018 5.2 2.1 0.4025 4.2 1.5 0.3630 4 0.9 0.2340 4 0.7 0.1850 3.8 0.4 0.1160 3.6 0.33 0.09
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Contrast Sensitivity Function(CSF)
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Ganglion cellReceptiveField
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Ganglion cell receptive field
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Ganglion cell receptive field
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Ganglion cell response to diffuse illumination
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Ganglion cell response to spatial grating
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Mach bandsDark band Bright band
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Mach bands
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Recognition Acuity
• Snellen• HOTV• LEA• Patti Pics
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LEA Symbols
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Patti Pics
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HOTV Test
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Resolution Acuity
• Tumbling E• Landolt C• Broken Wheel
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Broken Wheel test
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Tumbling E
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Landolt C
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Minimum detectable acuity
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Hyperacuity
• Vernier• Alignment test• Tilt test
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