Can somebody help me to understand what exactly image processing is being done by CCV to get the blob? Sometimes, without I set the filter adjustment (like threshold, highpass, amplifier, and etc in default) in CCV, I can see the blob on tracked images on CCV. But sometimes too, when I try it in a room that sun light can pass through from ventilation, event though in the source image I see the touch position on acrylic has higher intensity than others, but in tracked image not only blob from the finger appear. It makes me really curious about the image processing that CCV did. Is it based on pixel that has higher intensity between each other or it based on range frequency of IR?