The invention relates to scanning linear image sensors with signal integration, in which an image of a line of points from an observed scene is reconstructed by the addition of successive images taken by a plurality of photosensitive lines which successively observe the same line of the scene as the scene moves across the sensor perpendicularly to the lines. The sensor according to the invention uses charge transfer pixels (Pm,i,j) grouped into M groups of N lines; an analog charge summation is carried out in each group; and the results of this summation are read by read circuits (READm) associated with each group, and then digitized and added to those of the other groups.