Interlace

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Handling of interlaced video streams

In order to handle interlaced video sequences, two sets of classes are provided:

video input and output streams that load and save video fields, rather than frames, and
a video field type, with associated pixel iterator.

These classes are designed to handle interlacing of any order, although the interface currently only supports conventional two-fold interlacing. They can also handle non-interlaced video streams.

The classes differ from the basic video and image classes in that only the rows for the current video field can be accessed. For two-fold interlacing, the odd-numbered fields have only odd-numbered rows, and even-numbered fields only even-numbered rows. Attempts to access non-existent rows should return an error if the code is compiled in debug mode. The FieldIterC pixel iterator class handles this transparently to the programmer.

Subtopics:

AMMA
Image
Video
Interlace

Classes:

Default Classes	Description
ImgFieldC	Template class for video fields
VidIntlBodyC	Base class for interlaced video processing
VideoIntlInC	Template class for interlaced video i/p stream
VidIntlBodyInC	Body class for interlaced video template input streams.
VidIntlBodyOutC	Body class for interlaced video template output streams.
VideoIntlOutC	Template class for interlaced video o/p stream
FieldIterC	Pixel iterator for ImgFieldC field template class.

Author: Bill Christmas, Generated by DocEntry: March 20, 2001