IMAGE PROCESSING METHOD AND IMAGE PROCESSING APPARATUS

• US 20100053360A1
• Filed: 08/26/2009
• Published: 03/04/2010
• Est. Priority Date: 08/28/2008
• Status: Abandoned Application

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Hasegawa, Naoyuki
• Application Number:
  US12/548,052
• Publication Number:
  US 20100053360A1
• Time in Patent Office: Days
• US Class Current: 348/222.100
• CPC Class Codes: G06T 2200/24 involving graphical user interfaces [GUIs]
• CPC Class Codes: G06T 2207/20208 High dynamic range [HDR] image processing
• CPC Class Codes: G06T 5/20 using local operators
• CPC Class Codes: G06T 5/50 using two or more images, e.g. averaging or subtraction
• CPC Class Codes: H04N 23/69 Control of means for changing angle of the field of view, e.g. optical zoom objectives or electronic zooming
• CPC Class Codes: H04N 23/741 by increasing the dynamic range of the image compared to the dynamic range of the electronic image sensors

Abstract

An image processing method includes acquiring shooting data indicating a condition used for capturing image data, calculating an adaptation field size using data indicating an adaptation field angle and the acquired shooting data, executing filter processing on the image data according to the adaptation field size to calculate data indicating an adaptation state of a scene that is a shooting object of the image data, and calculating data indicating appearance of the scene using the data indicating the adaptation state.

Claims

1. An image processing method comprising:

acquiring shooting data indicating a condition used for capturing image data;

calculating an adaptation field size using data indicating an adaptation field angle and the acquired shooting data;

executing filter processing on the image data according to the adaptation field size to calculate data indicating an adaptation state of a scene that is a shooting object of the image data; and

calculating data indicating appearance of the scene using the data indicating the adaptation state.

2. The image processing method according to claim 1, wherein the shooting data includes at least one of information indicating an image width and information indicating an image height.

3. The image processing method according to claim 1, wherein the shooting data includes information required to calculate an angle of view used for capturing the image data.

4. The image processing method according to claim 1, wherein the shooting data includes information indicating an angle of view used for capturing the image data.

5. The image processing method according to claim 3, wherein the information required to calculate the angle of view includes information indicating an optical sensor size, information indicating a lens focal length, and information indicating an enlargement rate.

6. The image processing method according to claim 1, further comprising executing processing for extracting a low-frequency component from the image data using a low-pass filter.

7. The image processing method according to claim 6, wherein the low-pass filter is a Gaussian filter or a bilateral filter.

8. The image processing method according to claim 6, wherein the low-pass filter has a horizontal size greater than a vertical size thereof.

9. The image processing method according to claim 1, further comprising calculating data indicating the appearance of the scene based on a vision model that takes local adaptation characteristics of the human vision into consideration.

10. An image processing apparatus comprising:

an acquisition unit configured to acquire shooting data indicating a condition used for capturing image data;

an adaptation field size calculation unit configured to calculate an adaptation field size using data indicating an adaptation field angle and the shooting data acquired by the acquisition unit;

an adaptation state calculation unit configured to execute filter processing on the image data according to the adaptation field size to calculate data indicating an adaptation state of a scene that is a shooting object of the image data; and

a scene appearance calculation unit configured to calculate data indicating appearance of the scene using the data indicating the adaptation state.

11. A computer-readable storage medium storing a program for causing a computer to execute image processing, the program comprising:

computer-executable instructions for acquiring shooting data indicating a condition used for capturing image data;

computer-executable instructions for calculating an adaptation field size using data indicating an adaptation field angle and the acquired shooting data;

computer-executable instructions for executing filter processing on the image data according to the adaptation field size to calculate data indicating an adaptation state of a scene that is a shooting object of the image data; and

computer-executable instructions for calculating data indicating appearance of the scene using the data indicating the adaptation state.