Timeline for effect of high pass filtering and low pass filtering on background color
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 22, 2023 at 15:52 | vote | accept | David | ||
| Nov 3, 2015 at 7:43 | comment | added | Royi | Pay attention that HPF Filter enforces the sum of pixels is zero. | |
| Sep 5, 2015 at 1:54 | comment | added | CMDoolittle | No. Look, there is no "background", really. There are only pixel values. If the pixel values are unchanging relative to their neighbors, LPF has a minimal effect. | |
| Sep 4, 2015 at 20:39 | comment | added | David | I know that LPF attenuates high frequencies. My question is whether LPF has a effect on background similar to HPF. | |
| Sep 4, 2015 at 4:43 | comment | added | CMDoolittle | LPF attenuates high spatial frequencies, which appears to us as blurring edges. | |
| Sep 4, 2015 at 0:29 | comment | added | David | yes, it its true. in addition, the derivative can explain it. if we take derivative from a constant (solid intensity), the result is zero (black). But what about low pass filtering? I know the HPF is derivative in Spatial domain. but, what about low pass filtering? | |
| Sep 3, 2015 at 20:21 | history | answered | CMDoolittle | CC BY-SA 3.0 |