Camera focusing related methods and apparatus

• US 9,554,031 B2
• Filed: 10/20/2014
• Issued: 01/24/2017
• Est. Priority Date: 12/31/2013
• Status: Active Grant

• Current Assignee: Blue River Technology Inc. (Deere & Company)
• Original Assignee: Light Labs Inc.
• Inventors: Laroia, Rajiv, Shroff, Sapna A
• Primary Examiner(s): DAGNEW, MEKONNEN D
• Application Number:
  US14/518,396
• Publication Number:
  US 20150189154A1
• Time in Patent Office: 827 Days
• US Class Current: 1/1
• CPC Class Codes: H04N 23/631 Graphical user interfaces [GUI] specially adapted for controlling image capture or setting capture parameters
• CPC Class Codes: H04N 23/959 by adjusting depth of field during image capture, e.g. maximising or setting range based on scene characteristics

Abstract

Methods and apparatus that facilitate or implement focus control in a camera and/or can be used to set the camera focus distance, e.g., the distance between the camera and an object which will appear in focus when the objects picture is taken by the camera. A depth map is generated for an image area, e.g., an area corresponding to an image which is captured by the camera. Based on said depth map, in various exemplary embodiments, a visual indication of which portions of an image captured by the camera device are in focus is generated. A user may indicate a change in the desired focus distance by touching a portion of the screen corresponding to an object at the desired focus distance or by varying a slider or other focus distance control.

Claims

1. A method of controlling a camera device, the method comprising:

generating a depth map of an image area;

generating, based on said depth map, a visual indication of which portions of an image captured by said camera device are in focus and depth information indicating depth of objects;

receiving user focus distance control input indicating a user selected focus distance from a user via i) a slider control, ii) a dial control or iii) a numerical focus input control; and

generating a new visual indication of depth information along with an indication of which portions of an image captured by said camera device are in focus based on said user selected focus distance.

2. The method of claim 1, further comprising:

modifying a portion of the image captured by said camera to alter a portion of said image which is not in focus, said modifying including blurring a portion of the image captured by said camera to produce blurring by an amount that is greater than the amount due to the lack of focus.

3. The method of claim 1, wherein different colors are used to indicate different object distances, a first color used to indicate objects in focus being one of said different colors, a second color being used to indicate objects closer to the camera device than objects which are in focus, said second color being one of said different colors and different from said first color.

4. The method of claim 1, further comprising:

displaying an image with a touch activated focus distance range bar, prior to generating a new visual indication, said image including the visual indication of which portions of the image captured by said camera device are in focus and depth information indicating depth of objects; and

determining a camera focus distance based on user control of a slider on said touch activated focus distance range bar.

5. The method of claim 4,

wherein generating a visual indication of which portions of an image captured by said camera device are in focus includes coloring different portions of said image different colors based on the distances to objects shown in said different portions of said image.

6. The method of claim 4,

wherein generating a new visual indication of depth information along with an indication of which portions of an image captured by said camera device are in focus based on said user selected focus distance includes:

changing coloring of the displayed image based on the user control of the slider on said touch activated focus distance range bar.

7. The method of claim 6,

wherein said change in the coloring of the displayed image is made prior to refocusing of the camera device based on the user control of the slider on said touch activated focus distance range bar.

8. The method of claim 7, wherein said change in color is performed based on the received user focus distance control input indicating a user selected focus distance.

9. The method of claim 1, further comprising:

receiving input from a user indicating a range of distances a user desires to be in focus; and

wherein generating a visual indication of which portions of an image captured by said camera device are in focus includes indicating as being in focus image portions corresponding to said range of distances a user desires to be in focus.

10. The method of claim 9 wherein said input from a user indicating a range of distances includes input indicating user selection of multiple objects which are located at different distances from said camera.

11. The method of claim 10, further comprising:

controlling a camera depth of field to include the multiple objects selected by the user within an in-focus distance range corresponding to said camera depth of field.

12. The method of claim 1,

wherein generating a new visual indication of depth information along with an indication of which portions of an image captured by said camera device are in focus based on said user selected focus distance includes:

changing coloring of a displayed image based on the user control of the slider on said touch activated focus distance range bar.

13. A camera device comprising:

a module configured to generate a depth map of an image area;

a module configured to generate, based on said depth map, a visual indication of which portions of an image captured by said camera device are in focus and depth information indicating depth of objects;

an interface configured to receive user focus distance control input indicating a user selected focus distance from a user via i) a slider control, ii) a dial control or iii) a numerical focus input control; and

wherein said module configured to generate a visual indication is further configured to generate a new visual indication of depth information along with an indication of which portions of an image captured by said camera device are in focus based on said user selected focus distance.

14. The camera device of claim 13, further comprising:

a module configured to modify a portion of the image captured by said camera to alter a portion of said image which is not in focus, said modifying including blurring a portion of the image captured by said camera to produce blurring by an amount that is greater than the amount due to the lack of focus.

15. The camera device of claim 13, wherein different colors are used to indicate different object distances, a first color used to indicate objects in focus being one of said different colors, a second color being used to indicate objects closer to the camera device than objects which are in focus, said second color being one of said different colors and different from said first color.

16. The camera device of claim 13, further comprising:

a display configured to display an image with a touch activated focus distance range bar, said image including the visual indication of which portions of the image captured by said camera device are in focus and depth information indicating depth of objects; and

a module configured to determine a camera focus distance based on user control of a slider on said touch activated focus distance range bar.

17. The camera device of claim 16, further comprising:

a module configured to color different portions of said image different colors based on the distances to the objects shown in said different portions of said image.

18. The camera device of claim 13, further comprising:

a module configured to receive input from a user indicating a range of distances a user desires to be in focus; and

wherein said module configured to generate a visual indication of which portions of an image captured by said camera device are in focus includes a module configured to indicate as being in focus image portions corresponding to said range of distances a user desires to be in focus.

19. The camera device of claim 18, wherein said module configured to receive input from a user indicating a range of distances includes a module configured to receive input indicating user selection of multiple objects which are located at different distances from said camera.

20. A non-transitory machine readable medium having machine executable instructions stored thereon which when executed by a processor control a camera device to:

generate a depth map of an image area;

generate, based on said depth map, a visual indication of which portions of an image captured by said camera device are in focus and depth information indicating depth of objects;

receive user focus distance control input indicating a user selected focus distance from a user via i) a slider control, ii) a dial control or iii) a numerical focus input control; and

generate a new visual indication of depth information along with an indication of which portions of an image captured by said camera device are in focus based on said user selected focus distance.