In this part, you will detect the golf ball position. You will first build a simple detector, then fix the reference so detection remains stable while the ball moves.
1
Add Find Object
Go to the blocks bar. Under Detections/Shapes, open Detectors and drag Find Object into the scenario.
2
Add Show Image
Under Input/Output, open Outputs/Exports and drag Show Image into the scenario.
3
Connect the detector
Connect the blocks as shown below.
Click Run Step. You should see the detected golf ball inside a red box in Show Image.
4
Test continuous detection
Click Run and watch the detection for about 10 seconds.
You may notice that detection becomes unstable. This happens because Image ROI Select keeps changing its reference as the ball moves, so the reference can become grass instead of the golf ball.
5
Add Image Memory
To keep the reference stable, add Image Memory.
Go to the blocks bar. Under Image Transformers, open Analysis and drag Image Memory into the scenario.
6
Add Logic Input
Under Input/Output, open Data Inputs and drag Logic Input into the scenario.
7
Rearrange crowded blocks
Move one block by clicking and dragging it.
Move multiple blocks by dragging a selection around them, then dragging the selected group.
8
Connect Image Memory
Connect the new blocks as shown below.
Image Memory freezes the frame we need, so the reference does not change while the video runs.
9
Save the reference frame
Run the scenario for one step. Then set Logic Input to True to save the image in Image Memory.
10
Tune Find Object
Move to Find Object and set Match Threshold to 100%.
Find Object match threshold
11
Run detection
Press Run and check that the detector follows the golf ball.
The detector is now working with a stable reference. Continue to the final page to check whether the golf ball reaches the hole.
