By modifying an edge detection algorithm applied on the grayscale image, we propose an advanced algorithm to generate the suitable threshold. This advanced algorithm works by creating a binary image on the vertical and horizontal side, then applying logical OR between 2 binary images. The achieved result successfully gives the desired object pattern. But in the future work, it should be tested and analyzed with many types of images to investigate if there is a weakness on a specific image.

algorithm, threshold, edge detection, grayscale image.