Spatial bandpass filter
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spatial bandpass filter. Which is commonly used in computer vision to find visual "edges" to determine the shape of objects. Vf. Vout. Iphoto. High gain inverting amp. Vout drops logarithmically with Iphoto. Vf. Vout. Iphoto. C1. R. Vf. Vout. Vp. Iphoto. High gain inverting amp.

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Spatial bandpass filter

spatial bandpass filter

Which is commonly used

in computer vision to find

visual "edges" to determine

the shape of objects.


Spatial bandpass filter

Vf

Vout

Iphoto

High gain inverting amp

Vout drops logarithmically with Iphoto

Vf

Vout

Iphoto


Spatial bandpass filter

C1

R

Vf

Vout

Vp

Iphoto

High gain inverting amp

By closing the loop, we can make this adaptive.


Spatial bandpass filter

Vout

Vp

Iphoto

If the loop is closed, we have our familiar circuit which has Vout =


Spatial bandpass filter

Because the ac gain of the amplifier is very high, in practice, it

is better to limit the gain using a capacitor divider.

C1

R

Vf

Vout

C2

Vp

Iphoto

High gain inverting amp

Since Vout now does the same job of feedback through the capacitor divider,


Spatial bandpass filter

Delbruck and Mead Photoreceptor


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