System and method for tone composition

• US 7,397,968 B2
• Filed: 10/29/2003
• Issued: 07/08/2008
• Est. Priority Date: 10/29/2003
• Status: Expired due to Fees

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Stavely, Donald J., Battles, Amy E., Stockton, Kenneth R., Miner, Kathy Louise, Barrios, Sarah J.
• Primary Examiner(s): Wu; Jingge
• Assistant Examiner(s): Krasnic; Bernard
• Application Number:
  US10/696,328
• Publication Number:
  US 20050094891A1
• Time in Patent Office: 1,714 Days
• Field of Search: 382/266, 382/274, 382/199, 348/333
• US Class Current: 382/274
• CPC Class Codes: G06T 7/12 Edge-based segmentation
• CPC Class Codes: H04N 1/4072 dependent on the contents of the original

Abstract

A system and method for assisting in tone composition that comprises receiving light information corresponding to light detected by a plurality of pixels, analyzing the light information to determine a light value for each of the plurality of pixels, determining contour information, the contour information corresponding to a plurality of groups of adjacent pixels, wherein each group of adjacent pixels is characterized by a unique predetermined range of light values, and communicating the contour information to a display.

Claims

1. A method implemented in an image capture device, the method for assisting in tone composition of an image, the method comprising the steps of:

receiving light information corresponding to light detected by a plurality of pixels of a photosensor in the image capture device;

analyzing the light information to determine a light value for each of the plurality of pixels, the light value corresponding to an adjustable exposure level;

determining contour information, the contour information corresponding to a plurality of groups of adjacent pixels, wherein each group of adjacent pixels is characterized by a unique predetermined range of light values, the contour information comprising tone contour regions and tone contour lines;

communicating the contour information to a display of the image capture device;

displaying the tone contour regions and the tone contour lines concurrently with the image prior to image capture, the tone contour lines indicating a transition between a first exposure level of a first tone contour region and a second exposure level of a second tone contour region; and

adjusting prior to image capture at least one of the first exposure level and the second exposure level based on the contour information, wherein the step of adjusting further comprises;

adjusting the received light information from a first group of adjacent pixels from an initial value to an adjusted value such that the adjusted light information for the first group is adjusted to an adjusted predetermined range of light values; and

adjusting a zone of the first group of adjacent pixels from an initial zone to an adjusted zone, the initial zone corresponding to an indicia indicating the unique predetermined range of light values and the adjusted zone corresponding to an adjusted indicia indicating an adjusted unique predetermined range of light values.

2. The method of claim 1, wherein the step of displaying further comprises the step of displaying the tone contour regions with a warning color.

3. The method of claim 1, wherein the step of displaying further comprises the step of displaying the tone contour regions with an indicia.

4. The method of claim 1, wherein the step of displaying further comprises the step of displaying the tone contour regions with an indicia corresponding to a zone.

5. The method of claim 1, further comprising the step of adjusting the received light information from a second group of adjacent pixels from a second initial value to a second adjusted value such that the adjusted light information for the second group is adjusted to a second adjusted predetermined range of light values.

6. The method of claim 1, wherein the step of adjusting further comprises the step of adjusting exposure of the first group of adjacent pixels from an initial exposure to an adjusted exposure.

7. The method of claim 1, wherein the step of adjusting further comprises the step of adjusting a tone of the first group of adjacent pixels from an initial tone to an adjusted tone, the initial tone corresponding to an initial indicia indicating the unique predetermined range of light values and the adjusted tone corresponding to an adjusted indicia indicating an adjusted unique predetermined range of light values.

8. The method of claim 1, wherein the step of receiving the light information further comprises the step of receiving the light information from the photosensor.

9. The method of claim 1, further comprising the steps of:

determining the contour information from the light information received from an exposure detector;

correlating the determined contour information with the light information from the photosensor;

identifying groups of adjacent pixels of the photosensor, each group of adjacent pixels characterized by the unique predetermined range of light values corresponding to the contour information; and

wherein adjusting further comprises adjusting a portion of the light information for at least one group of adjacent pixels from an initial value to an adjusted value such that the adjusted light information is adjusted to a second predetermined range of light values.

10. The method of claim 9, further comprising the steps of capturing the image with the adjusted light information.

11. The method of claim 1, further comprising the steps of:

determining the contour information for a group of adjacent pixels that are overexposed; and

displaying the contour information for the overexposed pixels as a tone contour region with an indicia indicating an overexposed condition.

12. The method of claim 1, further comprising the steps of:

determining the contour information for a group of adjacent pixels that are underexposed; and

displaying the contour information for the underexposed pixels as a tone contour region with an indicia indicating an underexposed condition.

13. A digital camera that assists in tone composition of an image, comprising:

a photosensor of the digital camera, the photosensor comprising a plurality of pixels that detect light;

a processor that receives light information from the plurality of pixels, that analyzes the light information to determine a light value for each of the plurality of pixels and that determines contour information, the contour information corresponding to a plurality of groups of adjacent pixels, wherein each group of adjacent pixels is characterized by a unique predetermined range of light values, the light value corresponding to an exposure level; and

a display configured to display the contour information and a preview image, the preview image comprising the image detected before image capture, the contour information comprising tone contour regions and tone contour lines, the tone contour lines indicating a transition between a first exposure level of a first contour region and a second exposure level of a second contour region;

wherein the processor is further configured to adjust at least one of the first exposure level and the second exposure level based on the contour information, wherein the processor is further configured to;

adjust the received light information from a first group of adjacent pixels from an initial value to an adjusted value such that the adjusted light information for the first group is adjusted to an adjusted predetermined range of light values;

determine an adjusted tone contour line, the adjusted tone contour line corresponding to a transition between the first group of adjacent pixels characterized by the adjusted predetermined range of light values and another group of adjacent pixels characterized by a unique other predetermined range of light values; and

display the adjusted tone contour line concurrently with the image.

14. The digital camera of claim 13, further comprising an exposure detector that communicates detector light information to the processor wherein the contour information is determined from the received detector light information.

15. The digital camera of claim 13, further comprising a viewfinder configured to display the contour information and the preview image.

16. A method implemented in an image capture device, the method for assisting in tone composition of an image, the method comprising the steps of:

receiving light information corresponding to light detected by a plurality of pixels of a photosensor in the image capture device;

analyzing the light information to determine a light value for each of the plurality of pixels, the light value corresponding to an adjustable exposure level;

determining contour information, the contour information corresponding to a plurality of groups of adjacent pixels, wherein each group of adjacent pixels is characterized by a unique predetermined range of light values, the contour information comprising tone contour regions and tone contour lines;

communicating the contour information to a display of the image capture device;

displaying the tone contour regions and the tone contour lines concurrently with the image prior to image capture, the tone contour lines indicating a transition between a first exposure level of a first tone contour region and a second exposure level of a second tone contour region;

adjusting prior to image capture at least one of the first exposure level and the second exposure level based on the contour information, wherein the step of adjusting further comprises adjusting the received light information from a first group of adjacent pixels from an initial value to an adjusted value such that the adjusted light information for the first group is adjusted to an adjusted predetermined range of light values;

determining an adjusted tone contour region, the adjusted tone contour region corresponding to the first group of adjacent pixels characterized by the adjusted predetermined range of light values; and

displaying the adjusted tone contour region concurrently with the image.