A swipe image sensor with summation, allowing the synchronized reading of the same image line by a plurality of lines of P photosensitive pixels successively and the pixel to pixel summation of the signals read by the different lines, characterized in that the sensor comprises: - an array of M groups of N lines of P pixels producing charges proportional to the illumination, these pixels being arranged in P charge transfer registers in a column of rank j, where j varies from 1 to P, allowing the progressive accumulation, in a pixel of rank j of the N th line of pixels of a group of rank m, where m varies from 1 to M, of the charges collected in the N pixels of rank j of this group, - within the array of pixels, M lines of P read circuits (READ m,j) addressable in line and performing a charge-to-voltage conversion of the charges collected in the P pixels of the N th line of a group of pixels, the read circuits of a line of rank m being positioned in line and each read circuit of rank j of this line being connected to a respective column conductor (Ccj) of rank j common to all the read circuits of rank j of the different lines, in order to provide on this conductor an analog electrical signal based on the charges accumulated in the pixels of rank j of the N th line of any group of lines of pixels, - outside the array of pixels, M lines of P digitization circuits (ADC m,j), each addressable in line, in correspondence to the addressing of a respective line of reading circuits, the digitization circuit of rank j of this line comprising a sampler for sampling an analog signal present on the column conductor of rank j, and an analog-digital converter for supplying a digital value of the analog signal, - a means of summation of digital values capable of adding together digital values obtained from the converters and corresponding to the sampling of a plurality of analog signals all corresponding to the observation of the same image point of rank j in an observed image line. - an array of M groups of N lines of P pixels producing charges proportional to the illumination, these pixels being arranged in P charge transfer registers in a column of rank j, where j varies from 1 to P, allowing the progressive accumulation, in a pixel of rank j of the N th line of pixels of a group of rank m, where m varies from 1 to M, of the charges collected in the N pixels of rank j of this group, - within the array of pixels, M lines of P read circuits (READ m,j) addressable in line and performing a charge-to-voltage conversion of the charges collected in the P pixels of the N th line of a group of pixels, the read circuits of a line of rank m being positioned in line and each read circuit of rank j of this line being connected to a respective column conductor (Ccj) of rank j common to all the read circuits of rank j of the different lines, in order to provide on this conductor an analog electrical signal based on the charges accumulated in the pixels of rank j of the N th line of any group of lines of pixels, - outside the array of pixels, M lines of P digitization circuits (ADC m,j), each addressable in line, in correspondence to the addressing of a respective line of reading circuits, the digitization circuit of rank j of this line comprising a sampler for sampling an analog signal present on the column conductor of rank j, and an analog-digital converter for supplying a digital value of the analog signal, - a means of summation of digital values capable of adding together digital values obtained from the converters and corresponding to the sampling of a plurality of analog signals all corresponding to the observation of the same image point of rank j in an observed image line.