The shape and size of white blood cells in the blood are often used as indicators of the white blood cell abnormalities. Meanwhile, the diameter of the white blood cells can be used for cell classification and identification if there are abnormalities of white blood cells. During the identification of white blood cells is done manually by medical personnel with the help hemocytometer that calculation results are still dependent on the observer subjectivity. Another way is by hematology analyzer that has a more precise accuracy but at a costly price. Digital image processing is a method of processing an object in a digital image automatically. In this case, it can be an alternative calculation of the s and diameter of blood cells. In this research, the white blood cells identified using Active Contour methods. The results show that this method successfully detects the contours of 200 white blood cells images in a relatively short time

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