Using Vuforia, I had to come up with a target to feed into the database for Vuforia to detect. This meant coming up with a satisfactory target. On the Vuforia website there is a guide on what makes a good target image and what is not a good target image[1].
The factors listed for a good target are: High contrast, Rich in detail, and no repetitive patterns.
Vuforia also provides a rating system for every target given, and shows the points of interest that the library looks at.
For example, a straight line does not make for a good target. There is very little contrast or details for vuforia to pick up on. As such, vuforia gives the target a 0 star rating, and there is a single point of interest.
Adding more lines does improve the rating of the image, as it can add more points of interest for the library, however this caps out at about 2 stars.
As such
show picture I ended up using was:
As can be seen, there are multiple points of interest around the text, mouth, and glasses area, there is high levels of contrast with a white background(as recommended by the Vuforia page[1]) and there is no repeating patterns, making this a good image target to use.
[1]Vuforia Developer Library, 2019, Optimizing Target Detection and Tracking Stability, https://library.vuforia.com/articles/Solution/Optimizing-Target-Detection-and-Tracking-Stability#attributes
