Question

categorize each process as either lossless or lossy:
process
lossless or lossy?
inter - frame coding: instead of storing every pixel for every frame, the computer stores the differences between the pixels.
lossless
entropy coding: the computer replaces frequently occurring patterns of bits with shorter representations, remembering the replacements in a table.
lossy
subjective field of interest: the computer detects when a person is the focus of the video frame, and stores less information about the background.
lossless

Explanation:

1. Inter - frame coding: Since it stores pixel differences and can fully reconstruct the original data from those differences, it is lossless.
2. Entropy coding: By replacing patterns with shorter representations and having a replacement table, the original data can be restored exactly, so it is lossless.
3. Subjective field of interest: Storing less information about the background when a person is the focus means some data is discarded permanently and cannot be fully restored, so it is lossy.

Answer:

1. Inter - frame coding: Lossless
2. Entropy coding: Lossless
3. Subjective field of interest: Lossy