| --- Log opened Tue Jan 30 00:00:47 2007 |
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| 03:48 | <@ToxicFrog> | Ok, bicubic filtering is nasty. |
| 03:50 | <@ToxicFrog> | result = (1.0/6.0)*(R1*Gc(ix,iy-1) + R2*Gc(ix,iy) + R3*Gc(ix,iy+1) + R4*Gc(ix,iy+2)); |
| 03:50 | <@ToxicFrog> | #define Gc(X,Y) ((1.0/6.0)*(S1*G(X-1,Y) + S2*G(X,Y) + S3*G(X+1,Y) + S4*G(X+2,Y))) |
| 03:50 | <@ToxicFrog> | And there's another ten #defines behind that. |
| 03:51 | <@ToxicFrog> | It works, though! |
| 03:56 | < Vornicus> | Eeew |
| 03:57 | <@ToxicFrog> | This is, I note, not some kind of workaround to fit it into the language; the reference equations are thirteen lines long and just as nasty. |
| 03:57 | < Vornicus> | ...I didn't think bicubic was that bad. |
| 03:57 | <@ToxicFrog> | I can paste them here if you don't believe me. |
| 03:59 | < Vornicus> | ...though now that I think on it I'm probably using the wrong invariants. |
| 03:59 | <@ToxicFrog> | Basically, the pixel value is the value of the row of four pixels around it, which is 1/6th of the sum of the value of each of those pixels multiplied by a position-specific value that I don't know how they derive. |
| 03:59 | <@ToxicFrog> | And the value of each of those pixels is the value of the four-pixel column it's a part of calculated in the same way. |
| 04:00 | <@ToxicFrog> | Bilinear is much nicer. |
| 04:00 | < Vornicus> | Bilinear is much nicer. |
| 04:00 | < Vornicus> | There is only one way to /do/ bilinear. |
| 04:00 | <@ToxicFrog> | I think there's only one way to do bicubic. Or at least, we've only covered on way so far. |
| 04:01 | <@ToxicFrog> | Bilinear also has the advantage that it's a tiny fraction of the size of bicubic and makes intuitive sense. |
| 04:01 | < Vornicus> | There's at least two different kinds of invariants I can think of - you can interpolate in the bezier fashion, where the two inner points are not touched but are control points, and you can do something where the two /outer/ points are non-touched control points. |
| 04:02 | < Vornicus> | And then there's stuff like cubic splines, where the curve touches /all/ the vertices... http://mathworld.wolfram.com/CubicSpline.html |
| 04:04 | < Vornicus> | I used biquadratic surfaces in my ottdgfx thing. |
| 04:05 | <@ToxicFrog> | I am totally not awake enough to grok that. |
| 04:05 | < Vornicus> | Dude, I'm not awake enough to grok it. |
| 04:06 | <@ToxicFrog> | ftp://131.104.49.49/cis4720/lab_1/notes.pdf -- this is the equation we're using |
| 04:08 | | * Vornicus eyes |
| 04:09 | < Vornicus> | Okay, I don't know what the hell it's doing. |
| 04:09 | | * Chalcedon boggles at TFs equation |
| 04:10 | | * Chalcedon offers cookies and coffee for midnight-assignment-doings |
| 04:11 | <@ToxicFrog> | It's sampling the sixteen points between (x-1,y-1) and (x+2,y+2) weighted according to something I don't understand. |
| 04:11 | <@ToxicFrog> | It works, though. |
| 04:13 | < Vornicus> | Yeah, I don't understand the weighting either. |
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| 04:50 | <@Reiver> | VORN |
| 04:51 | <@Reiver> | I'm trying to work out formula thingies and failing. |
| 04:53 | < Vornicus> | oh? |
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| --- Log closed Wed Jan 31 00:00:47 2007 |