Display control method and device for implementing said method
A method of controlling the display of images in the form of a pixel array, includes for a pixel of the array, asynchronous information representing events concerning the pixel is received, a first activation of the pixel is actuated at an activation time determined by a first event of the asynchronous information, and at least a second activation of the pixel is actuated in order to repeat the first activation of the pixel at respective times defined by a refresh sequence.
1. An image display, comprising:
a display unit providing a pixel array; and
a controlling device for controlling the display of images as a pixel array, the controlling device including:
an input interface configured to receive, from an asynchronous event-based vision sensor, asynchronous information representing events for at least one pixel of the image, each event among the events corresponding to a variation of light concerning said pixel beyond a threshold, and
a pixel activation control unit, coupled operationally with the input interface, and configured to
actuate a first activation of the pixel at an activation time determined by a first event of the asynchronous information, and
actuate at least a second activation of the pixel in order to repeat the first activation of the pixel at respective times defined by a refresh sequence.
2. A control device for controlling the display of images as a pixel array, comprising:
an input interface configured to receive, from an asynchronous event-based vision sensor, asynchronous information representing events for at least one pixel of the image, each event among the events corresponding to a variation of light concerning said pixel beyond a threshold; and
a pixel activation control unit, coupled operationally with the input interface, and configured to:
actuate a first activation of the pixel at an activation time determined by a first event of the asynchronous information, and
actuate at least a second activation of the pixel in order to repeat the first activation of the pixel at respective times defined by a refresh sequence.
3. The control device according to claim 2 , further comprising:
an output interface, coupled operationally with the pixel activation control unit, to deliver pixel activation commands.
4. A non-transitory computer readable storage medium, having stored thereon a computer program comprising program instructions, the computer program being readable by a data-processing unit and adapted to cause the data-processing unit to carry out, upon execution by the data-processing unit, operations for controlling a display of images as a pixel array, said operations including, for a pixel of the array:
receiving, from an asynchronous event-based vision sensor, asynchronous information representing events concerning the pixel, each event among the events corresponding to a variation of light concerning said pixel beyond a threshold;
actuating a first activation of the pixel at an activation time determined by a first event of the asynchronous information;
actuating at least a second activation of the pixel in order to repeat the first activation of the pixel at respective times defined by a refresh sequence.
5. A method for controlling a display of images as a pixel array, the method comprising, for a pixel of the array:
receiving, from an asynchronous event-based vision sensor, asynchronous information representing events concerning the pixel, each event among said events corresponding to a variation of light concerning said pixel beyond a threshold;
actuating a first activation of the pixel at an activation time determined by a first event of the asynchronous information;
actuating at least a second activation of the pixel in order to repeat the first activation of the pixel at respective times defined by a refresh sequence.
6. The method according to claim 5 , wherein the first activation actuation of the pixel is repeated according to the refresh sequence until determination of a next activation time of the pixel by events of the asynchronous information.
7. The method according to claim 5 , wherein the reception of the asynchronous information comprises a reception of a signal carrying the asynchronous information, and the first activation actuation of the pixel comprises a detection in the signal of a first item of information representing the first event and the activation actuation on detection of the first item of information representing the first event.
8. The method according to claim 5 , wherein the refresh sequence defines activation times of the pixel separated by a time interval.
9. The method according to claim 8 , wherein the time interval is determined according to retinal persistence of human eye.
10. The method according to claim 8 , wherein the time interval is greater than 40 ms and lower than 800 ms.
11. The method according to claim 5 , wherein the activation actuations are delivered as electric stimulations applied to a visual prosthesis of a vision aid device.
12. The method according to claim 8 , wherein the activation is refreshed substantially simultaneously for a plurality of pixels of the pixel array.
13. The method according to claim 7 , wherein the signal comprises a train of binary pulses positioned over time as a function of light variations in a scene for the pixel.
14. The method according to claim 5 , wherein the information representing the first event comprises a first pulse positioned over time as a function of light variations in a scene for the pixel, and a second pulse positioned over time as a function of a greyscale for the activation of the pixel.
15. The method according to claim 5 , further comprising:
detecting in the asynchronous information a second item of information representing a second event for the pixel; and
when a time lag between the first and second events is lower than a threshold, not actuating the activation of the pixel at an activation time determined by the second event.
16. The method according to claim 15 , wherein the threshold is between 1 ms and 40 ms.