1. A method for harmonizing a combined image, comprising: receiving an image respectively from each of two or more cameras of an image-acquiring hardware device, the images from two of the cameras representing the same region in a first overlap region; measuring first pixel statistics of a predetermined number of predetermined pixels only in the first overlap region respectively for the respective image of each of the two cameras; determining a difference Δ pixel in the first pixel statistics of the respective images from the two cameras only in the first overlap region; calculating a first correction factor K pixel based on the difference Δ pixel , wherein the first correction factor K pixel is determined so that it would produce a reduction in the difference Δ pixel of less than Δ pixel /2 when applied to the image of one of the two cameras; applying the first correction factor K pixel in the image-acquiring hardware device; and receiving a further image respectively from each of the two cameras.