I am working on a program to detect the tips of a probing device and analyze the color change during probing. The input/output mechanisms are more or less in place. What I need now is the actual meat of the thing: detecting the tips.

In the images below, the tips are at the center of the crosses. I thought of applying BFS to the images after some threshold'ing but was then stuck and didn't know how to proceed. I then turned to OpenCV after reading that it offers feature detection in images. However, I am overwhelmed by the vast amount of concepts and techniques utilized here and again, clueless about how to proceed.

Am I looking at it the right way? Can you give me some pointers?

![Colored Image](https://i.stack.imgur.com/ciNBs.jpg)
Image extracted from short video

![Binary image with threshold set at 95](https://i.stack.imgur.com/3EndA.png)
Binary version with threshold set at 95