Process of 3D imaging of a scene to be studied operated by a device containing ways of generation of a luminous pulse, a matrix of C n opto-electronic sensors capable each to generate a representative signal of the intensity of the reflected luminous pulses which it received, ways of processing of this signal, a buffer memory a particular An address of which is associated with each of the C n sensors and an image memory, process characterized in what it contains: - a stage consisting in defining f different time of flight corresponding to f various depths of the plan to study and to associate a particular color to each of the f time of flight, then, successively, for each of these defined times of fight, to assure following under process: - emitting luminous pulses (1, 2, 3, 4) in a direction of a scene to be studied with ways of generation of a luminous pulse; - collecting the luminous pulse reflected by the scene to be studied, only for this time of fight, with the matrix of opto electronic sensors capable each to generate a representative signal of the intensity of the luminous pulse which it received; - integrating every representative generated signal of the intensity of the luminous pulses according to the duration of the luminous pulses (1, 2, 3, 4); - comparing, with the aforementioned ways of treatment, the signal level integrated of the luminous intensity got by every sensor in a preset threshold value; - storing in the buffer memory, at the addresses associated with the sensors having captured and integrated the luminous pulse reflected with a value superior to the aforementioned threshold value, a representative value of the color associated with this time of fight of the got luminous pulse; - blocking the addresses from the buffer memory storing this representative value of this color associated with this time of fight; - transferring the data from the buffer memory to the image memory at the end of the last under process and show this image memory on a screen. - a stage consisting in defining f different time of flight corresponding to f various depths of the plan to study and to associate a particular color to each of the f time of flight, then, successively, for each of these defined times of fight, to assure following under process: - emitting luminous pulses (1, 2, 3, 4) in a direction of a scene to be studied with ways of generation of a luminous pulse; - collecting the luminous pulse reflected by the scene to be studied, only for this time of fight, with the matrix of opto electronic sensors capable each to generate a representative signal of the intensity of the luminous pulse which it received; - integrating every representative generated signal of the intensity of the luminous pulses according to the duration of the luminous pulses (1, 2, 3, 4); - comparing, with the aforementioned ways of treatment, the signal level integrated of the luminous intensity got by every sensor in a preset threshold value; - storing in the buffer memory, at the addresses associated with the sensors having captured and integrated the luminous pulse reflected with a value superior to the aforementioned threshold value, a representative value of the color associated with this time of fight of the got luminous pulse; - blocking the addresses from the buffer memory storing this representative value of this color associated with this time of fight; - emitting luminous pulses (1, 2, 3, 4) in a direction of a scene to be studied with ways of generation of a luminous pulse; - collecting the luminous pulse reflected by the scene to be studied, only for this time of fight, with the matrix of opto electronic sensors capable each to generate a representative signal of the intensity of the luminous pulse which it received; - integrating every representative generated signal of the intensity of the luminous pulses according to the duration of the luminous pulses (1, 2, 3, 4); - comparing, with the aforementioned ways of treatment, the signal level integrated of the luminous intensity got by every sensor in a preset threshold value; - storing in the buffer memory, at the addresses associated with the sensors having captured and integrated the luminous pulse reflected with a value superior to the aforementioned threshold value, a representative value of the color associated with this time of fight of the got luminous pulse; - blocking the addresses from the buffer memory storing this representative value of this color associated with this time of fight; - transferring the data from the buffer memory to the image memory at the end of the last under process and show this image memory on a screen.