Method and device for visualizing impacts of laser pulses on a target
AssigneeSafran Electronics & Defense
InventorVincent Marie
Life of this patent
Estimating the term…
Abstract
A method for visualising impacts of laser pulses emitted by a laser designator, according to a predetermined repetition interval (PRI), onto a target present in a scene, by means of a device including: an optronic sensor of the silicone-based CMOS type having a predetermined number of rows associated with a rolling shutter-type readout circuit. Each row of the sensor is exposed for an exposure time and read during a reading time so that the exposure time is no less than the reading time but no more than the product of the reading time and the number of rows. A transition between the rows exposed to a signal and the rows not exposed to said signal is detected in at least two images in order to infer the PRI.
Claims9
A method for visualising impacts of laser pulses emitted by a laser designator, according to a predetermined repetition interval (PRI), onto a target present in a scene, by means of a device comprising:
- a silicone-based CMOS-type optronic sensor having a predetermined number of rows, a rolling shutter-type reading circuit, and an electronic image processing circuit;
- the method comprising the steps of:
- exposing each row of the sensor for an exposure time and reading each row for a reading time so that the exposure time is no less than the reading time of each row, but no more than the product of the reading time of each row and the number of rows,
- detecting, in each image frame provided by the readout circuit, a transition between the rows of the sensor exposed to a signal resulting from a reflection of one of the laser pulses and of the rows not exposed to said signal,
- estimating, from this transition, a pulse dating instant in at least two images and in order to infer the pulse repetition interval.
Dependencies are inferred from the claim text.