OpenCV cv2.threshold Function Explained
The cv2.threshold function in OpenCV is used to perform thresholding on an image. It converts the input image into a binary image by setting pixels with values greater than a threshold to a fixed value (usually 255), and pixels with values less than or equal to the threshold to another fixed value (usually 0). This process helps extract features such as target objects or edges from an image. The syntax for calling the threshold function is:
Convert the source image to a binary image using a given threshold value.
Among them:
- src: gray-scale image input
- thresh: designated threshold
- maxval: pixel value assigned when exceeding threshold.
- type: There are various types of thresholding operations to choose from (such as cv2.THRESH_BINARY, cv2.THRESH_BINARY_INV, cv2.THRESH_TRUNC, etc.)
The function returns the actual threshold value as “ret” and the processed binary image as “dst”.
