Digital signal and image processing
This or that
4 DSP pairs students always mix up
Do you know the difference? Four pairs, answer before I do.
Quick check · tap an answer to continue
Lesson notes
Key points
- Sampling / Quantisation: Sampling discretises time; quantisation discretises amplitude into fixed levels.
- Resolution / Bit depth: Resolution counts pixels; bit depth sets how many grey levels each pixel can take.
- Correlation / Convolution: Convolution flips the kernel before sliding it; correlation slides it unflipped.
- Low-pass / High-pass: Low-pass keeps smooth regions and blurs; high-pass keeps edges and fine detail.
Takeaway: Name the one difference and the pair never confuses you again.
Quick check: A median filter versus a mean filter: which better removes salt-and-pepper noise?
- Mean filter
- Median filter
- Neither works
The median ignores extreme outlier pixels instead of averaging them in.
Lessons like this, for your syllabus.
Short narrated study videos written for your course, level and exam. Free to start.
Get lessons for your own syllabus