Feb 16
linear algebra
Go over the dot product homework.
Discuss how that applies to a 2D transform into "wave space",
which lets you leave out the high spatial oscillations,
thus compressing the image in a lossy way.
The attached file is what I did in class ... which may or may not be helpful.
lossy compression - big picture
Depending on time and interest, look at the big picture of other lossy techniques,
starting at
and following up on specific topics.
Quick quiz:
- Estimate the bandwidth needed for audio & video at human sense resolution.
- How does that compare with available bandwidth?
- How does that compare with what we typically put up with in practice?
assignment for next time
... discuss what seems appropriate for this topic, at least one of :
- Do a toy image compression : (DCT transform, leave out high frequencies, transform back)
- Read about several lossy techniques (jpeg, mp3, vorbis, codecs & containers) & summarize.
- Read in more depth on one of these, different folks picking different technologies, and then share next week.
![[paper clip]](/courses/source/wiki_images/paper_clip_tilt.png)
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