Thresholding is a commonly used image segmentation technique in OpenCV, which involves assigning pixel values based on a specified threshold value. The process compares the value of each pixel with the threshold and sets it to either 0 or a maximum value (usually 255), depending on whether it is smaller or larger than the threshold. This technique is often used for separating a foreground object from its background. The threshold is the dividing value between two regions: below the threshold and above the threshold. In Computer Vision, thresholding is typically applied to grayscale images, so the image must first be converted to grayscale before thresholding can be performed. Hope this helps you clear your doubt.