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8
content/notes/05-feature-description-and-matching.md
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@ -46,6 +46,7 @@ A SIMPLE FEATURE DESCRIPTOR
Feature invariance Feature invariance
![](https://i.imgur.com/DTsADVj.png) ![](https://i.imgur.com/DTsADVj.png)
> [!INFO] does not handle rotation, changing scale or brightness
![](https://i.imgur.com/mNxr2XK.png) ![](https://i.imgur.com/mNxr2XK.png)
SIFT: SCALE-INVARIANT FEATURE TRANSFORM SIFT: SCALE-INVARIANT FEATURE TRANSFORM
@ -58,6 +59,12 @@ SIFT: SCALE-INVARIANT FEATURE TRANSFORM
- Rotation invariance by estimating feature orientation - Rotation invariance by estimating feature orientation
- Window is oriented to the dominant image gradient - Window is oriented to the dominant image gradient
> [!INFO] not just direct comparision, compared on multiple, permutations
> [!QUESTION] how is this different from doing different perumtations of grayscale vlues
> [!INFO]
SIFT FEATURE DETECTION/DESCRIPTION SIFT FEATURE DETECTION/DESCRIPTION
- Detect blob features and determine their scale - Detect blob features and determine their scale
- Compute a Histogram of Gradients around the blob - Compute a Histogram of Gradients around the blob
@ -65,4 +72,3 @@ SIFT FEATURE DETECTION/DESCRIPTION
- A square region is used to compute the descriptor - A square region is used to compute the descriptor
- Square’s size from the blob size; orientation from HoG peaks - Square’s size from the blob size; orientation from HoG peaks

2
content/notes/cosc-342.md
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@ -21,7 +21,7 @@ tags:
- [x] [[02-colour-representation]] - [x] [[02-colour-representation]]
- [x] [[03-2d-transforms]] - [x] [[03-2d-transforms]]
- [[04-mosaicing]] - [[04-mosaicing]]
- [[05-feature-description-and-matching]] - [x] [[05-feature-description-and-matching]]
# Info # Info