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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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Presentation Transcript
slide6

spatial bandpass filter

Which is commonly used

in computer vision to find

visual "edges" to determine

the shape of objects.

slide8

Vf

Vout

Iphoto

High gain inverting amp

Vout drops logarithmically with Iphoto

Vf

Vout

Iphoto

slide9

C1

R

Vf

Vout

Vp

Iphoto

High gain inverting amp

By closing the loop, we can make this adaptive.

slide10

Vout

Vp

Iphoto

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

slide11

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,

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