A system comprising a pulsating light source and an apparatus for taking moving pictures, the apparatus comprising: a rectangular imaging array comprising a plurality of rows (94, 95) and columns of ultra high dynamic range pixel sensors and a plurality of readout lines, and a plurality of row select lines; a plurality of column processing circuits, each column processing circuit being connected to a corresponding one of said plurality of readout lines; and a controller that causes said rectangular imaging array to measure a plurality of images of a scene being illuminated by the pulsating light source, the pulsating light source has an illumination period, during which an illumination pulse having an illumination pulse duration is generated, each of said plurality of images being generated in a frame period comprising an exposure period and a dead period; wherein each pixel sensor has a main photodiode used to measure light received by the pixel sensor during an exposure, and a floating diffusion node; characterized in that: each pixel sensor comprises a parasitic photodiode associated with said floating diffusion node, the parasitic photodiode acting as a second photodiode and being used to measure light received by the pixel sensor during the exposure, the second photodiode having a lower light to photocharge conversion ratio than the main photodiode wherein each pixel sensor provides a first pixel intensity value corresponding to a charge generated by the parasitic photodiode during the exposure and a second pixel intensity value corresponding to a charge generated by the main photodiode during the exposure; and each dead period is less than the illumination pulse duration; and said exposure period is not synchronized with said illumination period. a rectangular imaging array comprising a plurality of rows (94, 95) and columns of ultra high dynamic range pixel sensors and a plurality of readout lines, and a plurality of row select lines; a plurality of column processing circuits, each column processing circuit being connected to a corresponding one of said plurality of readout lines; and a controller that causes said rectangular imaging array to measure a plurality of images of a scene being illuminated by the pulsating light source, the pulsating light source has an illumination period, during which an illumination pulse having an illumination pulse duration is generated, each of said plurality of images being generated in a frame period comprising an exposure period and a dead period; wherein each pixel sensor has a main photodiode used to measure light received by the pixel sensor during an exposure, and a floating diffusion node; characterized in that: each pixel sensor comprises a parasitic photodiode associated with said floating diffusion node, the parasitic photodiode acting as a second photodiode and being used to measure light received by the pixel sensor during the exposure, the second photodiode having a lower light to photocharge conversion ratio than the main photodiode wherein each pixel sensor provides a first pixel intensity value corresponding to a charge generated by the parasitic photodiode during the exposure and a second pixel intensity value corresponding to a charge generated by the main photodiode during the exposure; and each dead period is less than the illumination pulse duration; and said exposure period is not synchronized with said illumination period. each pixel sensor comprises a parasitic photodiode associated with said floating diffusion node, the parasitic photodiode acting as a second photodiode and being used to measure light received by the pixel sensor during the exposure, the second photodiode having a lower light to photocharge conversion ratio than the main photodiode wherein each pixel sensor provides a first pixel intensity value corresponding to a charge generated by the parasitic photodiode during the exposure and a second pixel intensity value corresponding to a charge generated by the main photodiode during the exposure; and each dead period is less than the illumination pulse duration; and said exposure period is not synchronized with said illumination period.