A method is provided for detecting and tracking targets in a series of images, at least one track as the existing track, being formed from spots detected in images in the series preceding a current image. The method includes, for the current image: obtaining at least one spot included in the current image and, for each spot, a value representing a characteristic of the spot; classifying each spot according to the representative value in a first category when the representative value is higher than a first predefined threshold or in a second category when the representative value lies between the first predefined threshold and a lower second predefined threshold; for each existing track, allocating a spot in the first category to the existing track and allocating a spot in the second category to the existing track when no spot in the first category is compatible with said existing track.