This plugin is extensively recoded in Mar 2009 for speeding up. Also in place of color a background clip is added. During Dec 2012 another revamp was done to enable accepting floating point input and almost no restrictions in the values of the cooordinates
Reform plugin does a geometric transformation and in certain cases may produce artifacts. Reformer Plugin which does Matrix operations gives better results and if possible switch to that plugin.
This plugin is meant for correcting minor distortions. If used for very large distortions most likely the linearity assumptions and interpolation quality will suffer. Artifacts may appear especially in case of deskew function.
There are 2 functions included in this plugin. These are:
Deskew : Converts a quadrilateral to a rectangle.
Skew : Converts a rectangle to aquadrilateral.
Most of the parameters can be linearly varied over the length of the effect, and so it can be used to distort or correct distorted faces or objects progressively. The parameters for both these functions are identical. RGB32, RGB24, YUY2 and YV12 formats are accepted. For reading coordinates correctly my plugin Grid can be used. Interpolation options are Lanczos 6x6, cubic 4x4, linear 2x2 and nearest point It has to be ensured that the quadrilateral is convex
| Parameter | Parameter name | Variable type | Limits of values | Default value |
| clip to be skewed or deskewed | clip | none | ||
| clip to be used as background | clip | none | ||
| Q left top x coordinate | ltopx | float | none | 0 |
| Q left top y coordinate | ltopy | float | none | 0 |
| Q left bottom x coordinate | lbotx | float | none | 0 |
| Q left bot y coordinate | lboty | float | none | frame height-1 |
| Q right top x coordinate | rtopx | float | none | width - 1 |
| Q right top y coordinate | rtopy | float | none | 0 |
| Q right bottom x coordinate | rbotx | float | none | width -1 |
| Q right bot y coordinate | rboty | float | none | frame height-1 |
| R left x coordinate | leftx | float | none | 0 |
| R right x coordinate | rightx | float | none | width-1 |
| R top y coordinate | ytop | float | none | 0 |
| R bottom y coordinate | ybot | float | none | frame height-1 |
| End frame Q left top x coordinate | eltopx | float | none | ltopx |
| End frame Q left top y coordinate | eltopy | float | none | ltopy |
| End frame Q left bottom x coordinate | elbotx | float | none | lbotx |
| End frame Q left bot y coordinate | elboty | float | none | lboty |
| End frame Q right top x coordinate | ertopx | float | none | rtopx |
| End frame Q right top y coordinate | ertopy | float | none | rtopy |
| End frame Q right bottom x coordinate | erbotx | float | none | rbotx |
| End frame Q right bot y coordinate | erboty | float | none | rboty |
| End frame R left x coordinate | eleftx | float | none | leftx |
| End frame R right x coordinate | erightx | float | none | rightx |
| End frame R top y coordinate | eytop | float | none | ytop |
| End frame R bottom y coordinate | eybot | float | none | ybot |
| resize interpolation to use | resize | string | "lanczos" "line" "point" | "lanczos" |
Script examples:-
img = avisource("..........")
bg = blankclip(img, color = ...)
deskew(img, bg,ltopx=44,ltopy=17,lbotx=34,lboty=470,rtopx=612,rtopy=70,rbotx=684,rboty=426)
deskew(img, bg,ltopx=44,ltopy=17,lbotx=34,lboty=470,color=$ff00, resize = "point")
skew(img, bg,ltopx=44,ltopy=17,lbotx=34,lboty=470,rtopx=612,rtopy=70,rbotx=684,rboty=426)
skew(img, bg,ltopx=44,ltopy=17,lbotx=34,lboty=470,color=$ff00, resize = "line")
| Test input | |
| Deskewed | |
| Reskewed | |
| Real image | |
| deskewed | |
| reskewed | |
| To my index page | down load plugin | To Avisynth |