Question :
How do you account for temporal and spatial alignment between clips in the PQA500?
Réponses :
The PQA500 supports both manual and automatic alignment of reference and test clips by adjusting the following items:
1) Temporal Sync:
- Start and end frame or time for reference clip
- Start and end frame or time for test clip
- Temporal offset (shift) between reference and test clips
- Test clip frame rate
2) Spatial Alignment:
- Horizontal and/or vertical shift between reference and test clips
- Horizontal and/or vertical scaling or stretching between reference and test clips
- Horizontal and/or vertical cropping between reference and test clips (letterboxing, zoom etc...)
- Overall luminance gain and/or DC offset between reference and test clips
The user is given a choice of either manually adjusting each of these parameters while they watch a live-running PSNR until they achieve temporal and spatial alignment between the clips or if they wish they can run an automatic alignment which will scan a portion of the video clips looking for similarities and automatically determine the best temporal and spatial alignment.
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Numéro de la FAQ 61806
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