| 4.3. Fjern annakvar linje | ||
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4. Forbetringsfiltra |  |
| 4.3. Fjern annakvar linje | ||
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4. Forbetringsfiltra | |
Images captured by videocards, especially when fast movement is recorded, may look blurred and stripped, with split objects. This is due to how cameras work. They don't record 25 images per second, but 50, with half vertical resolution. There are two interlaced images in one frame. First line of first image is followed by first line of second image followed by second line of first image, etc. So, if there have been an important move between the two images, objects will appear split, shifted, stripped.
The Deinterlace filter keeps only one of both images and replaces missing lines by a gradient between previous and following lines. The resulting image, or selection, will be somewhat blurred, but can be improved by enhance filters.
Du kan finne testbilete for å prøve ut filteret på [WKPD-DEINTERLACE].
![[Notat]](images/note.png)
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Notat |
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These options are described in Del 2, «Common Features». |
This setting lets you choose between Keep even fields and Keep odd fields. It determines which pixels are kept and which are removed. Try both options to see which gives the best results for your image.
This setting lets you choose between deinterlacing Horizontal or Vertical lines.
This option lets you set the size of the deinterlaced rows or columns.
Figur 17.37. Eit lite eksempel på verknadane av filteret
Topp : Pikslane i like linjer er skifta med ein piksel mot høgre. Botn : Ei linje manglar. (Bileta er forstørra for å vise pikslane).
Avkryssa for Behald like linjer. Topp : Odde linjer er skift mot høgre for at dei skal bli på linje med dei like linjene. Botn: Den tomme linja er fylt med raudt.
Avkryssa for Behald odde linjer. Topp : Like linjer er skift mot venstre for at dei skal bli på linje med dei odde linjene. Botn: Den tomme linja er der framleis, men tilpassa ved hjelp av ein fargeovergang.
