Method and system for selective imaging of objects in a scene to yield enhanced image

• US 9,712,754 B2
• Filed: 06/29/2014
• Issued: 07/18/2017
• Est. Priority Date: 06/30/2013
• Status: Active Grant

• Current Assignee: BrightWay Vision Ltd.
• Original Assignee: BrightWay Vision Ltd.
• Inventors: David, Ofer, Levi, Eyal, Grauer, Yoav
• Primary Examiner(s): Jerabek, Kelly L
• Application Number:
  US14/902,013
• Publication Number:
  US 20160373633A1
• Time in Patent Office: 1,115 Days
• Field of Search: 348362, 348366-367, 348370-371
• CPC Class Codes: G01S 17/06 Systems determining position data of a target
• CPC Class Codes: G01S 17/08 for measuring distance only indirect measurement G01S17/46; active triangulation systems G01S17/48
• CPC Class Codes: G01S 17/18 wherein range gates are used
• CPC Class Codes: G01S 7/4802 using analysis of echo signal for target characterisation; Target signature; Target cross-section
• CPC Class Codes: G03B 7/16 in accordance with both the intensity of the flash source and the distance of the flash source from the object, e.g. in accordance with the "guide number" of the flash bulb and the focusing of the camera
• CPC Class Codes: G03B 9/70 with flash-synchronising contacts
• CPC Class Codes: H04N 23/56 provided with illuminating means
• CPC Class Codes: H04N 23/62 Control of parameters via user interfaces
• CPC Class Codes: H04N 23/72 Combination of two or more compensation controls
• CPC Class Codes: H04N 23/74 by influencing the scene brightness using illuminating means

Abstract

A system and a method for object selective camera flash are provided herein. The steps of the method may include: capturing a raw image of a scene using a capturing device, wherein a scene comprises background and objects viewed by the capturing device; indicating at least one location on the captured raw image, wherein the location on the captured image corresponds with a location in the scene; calculating a volume portion within the scene based on the indicated at least one location on the captured raw image; generating a flash pulse having specified parameters directed at the scene; synchronizing an exposure of the capturing device to be carried out when reflections of the flash pulse from the calculated volume portion reaches the capturing device; and accumulating the reflections to yield an enhanced image.

Claims

1. An imaging method for a mobile device comprising:

communicating between multiple devices to transfer at least boundary conditions determining scene conditions and determining whether flash is required;

capturing a raw image of a scene using a capturing device, wherein a capturing device operates in a gated mode having a timing sequence;

wherein a scene comprises background and objects viewed by the capturing device;

indicating two or more locations on the captured raw image, wherein each location on the captured raw image corresponds with a location in the scene;

calculating respective volume portions within the scene based on the indicated two or more locations on the captured raw image for two or more locations on the captured raw image, wherein the volume portions are at different distances from the capturing device and spaced from each other;

determining a flash pulse having specified parameters and said capturing device exposure timing sequence directed at the scene based at least on said boundary conditions;

for each and every calculated volume portion independently performing said determining, flash pulse and exposure timing sequence in which an exposure of the capturing device is synchronized with reflections of the flash pulse from the calculated volume portion reaching the capturing device;

after said flash pulse and exposure sequences accumulating the reflections of at least two scene volume portions within a single image frame to yield an enhanced image for said mobile device.

2. The method according to claim 1, wherein the indicating is carried out automatically, based on predefined criteria.

3. The method according to claim 1, wherein the indicating is carried out, based on user selection.

4. The method according to claim 3, wherein the user selection comprises at least one of:

a tactile event, a visual event, and a sound event.

5. The method according to claim 4, wherein the sound event is carried out by user voice input.

6. The method according to claim 3, wherein the selection is carried out manually responsive to user input.

7. The method according to claim 3, wherein the selection is carried out by at least one of:

selection of a 3D box, selection of a specified range, selecting one or more objects to ignore so that the selected volume portion does not include the ignored objects.

8. The method according to claim 3, wherein the user selection is carried out by indicating one or more objects over a touchscreen.

9. The method according to claim 1, further comprising repeating the generating and the synchronizing with one or more flash pulses and respective synchronized exposures.

10. The method according to claim 1, wherein each said volume portion is defined by a minimal range R_min being a minimal distance between the capturing device and the volume portion and a maximal range R_max being a maximal distance between the capturing device and the volume portion, and wherein the volume calculation is carried out by indicating R_min and R_max over said captured raw image.

11. The method according to claim 1, wherein the flash pulse is within a range of visible light.

12. The method according to claim 1, wherein the flash pulse is within a range of non-visible light.

13. The method according to claim 1, wherein the flash pulse parameters include:

intensity, frequency, and duration, and wherein the pulse parameters are adjusted based on the calculated volume portion parameters.

14. The method according to claim 1, wherein the volume portion calculation is carried out automatically, based on data recognition of one or more objects within the scene.

15. The method according to claim 1, wherein the volume portion calculation is carried out manually responsive to user input.

16. The method according to claim 1 wherein the boundary conditions include one or both of ambient light level and whether or not the apparatus is moving.

17. A mobile device comprising a system comprising:

a capturing device configured to operate in a gated mode according to a timing sequence to capture a raw image of a scene wherein a scene comprises background and objects viewed by the capturing device;

an indicator configured to indicate two or more locations on the captured raw image, wherein each location on the captured image corresponds with a position in the scene;

a computer processor configured to;

receive at least boundary conditions from another device and determine whether flash is required;

calculate respective volume portions within the scene based on the two or more locations on the captured raw image for two or more locations on the captured raw image, wherein the volume portions are at different distances from the capturing device and spaced from each other; and

for each volume portion determine a flash pulse having specified parameters and said capturing device timing sequence based at least on said boundary conditions; and

a light source configured to generate said flash pulse having said specified parameters and timing sequence directed at the scene,

wherein the computer processor is further configured to, for each and every calculated volume portion independently, synchronize an exposure of the capturing device to be carried out when reflections of the flash pulse from the calculated volume portion reaches the capturing device,

wherein, after said flash pulse and exposure sequences, reflections of at least two scene volumes within a single frame are accumulated, to yield an enhanced image for said mobile device.

18. The system according to claim 17, wherein said volume portion is defined by a minimal range R_min being a minimal distance between the capturing device and the volume portion and a maximal range R_max being a maximal distance between the capturing device and the volume portion and wherein the volume calculation is carried out by indicating R_min and R_max over said captured image.

19. The system according to claim 17, wherein the flash pulse is within visible light.

20. The system according to claim 17 wherein the boundary conditions include one or both of ambient light level and whether or not the apparatus is moving.