METHOD, APPARATUS AND SYSTEM FOR MODIFYING QUALITY OF AN IMAGE

• US 20120218280A1
• Filed: 02/17/2012
• Published: 08/30/2012
• Est. Priority Date: 02/25/2011
• Status: Abandoned Application

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: FREDEMBACH, Clement
• Application Number:
  US13/399,601
• Publication Number:
  US 20120218280A1
• Time in Patent Office: Days
• US Class Current: 345/581
• CPC Class Codes: G06T 5/90 Dynamic range modification of images or parts thereof
• CPC Class Codes: H04N 1/40093 Modification of content of picture, e.g. retouching geometric modifications H04N1/387

Abstract

A method of modifying perceptual quality of an image is disclosed. For each of a plurality of predetermined attributes, distribution values are determined for that attribute. The distribution values are determined across the image. Compactness of the distribution values is determined for each of the attributes. The compactness is a measure of spatial localisation of the distribution values for the respective attribute. An attribute is selected from the plurality of predetermined attributes based on the determined compactness of the respective distribution values. The selected attribute is modified in a part of the image associated with spatially localised values, so as to modify the perceptual quality of the image. The image is stored, according to the modified attribute, in a computer readable storage medium.

Claims

1. A method of modifying perceptual quality of an image, said method comprising:

determining, for each of a plurality of predetermined attributes, distribution values for that attribute, the distribution values being determined from a spatial distribution of the attribute across the image;

determining compactness of the distribution values for each of the attributes, said compactness being a measure of spatial localisation of the distribution values for the respective attribute;

selecting an attribute from the plurality of predetermined attributes based on the determined compactness of the respective distribution values;

modifying the selected attribute in a part of the image, so as to modify the perceptual quality of the image; and

storing the image, according to the modified attribute, in a computer readable storage medium.

2. The method of claim 1, further comprising increasing the value of the selected attribute in areas of the image where the selected attribute is compact.

3. The method of claim 1, further comprising decreasing the value of the selected attribute in areas of the image where the selected attribute is not compact.

4. The method of claim 1, further comprising increasing the value of the selected attribute in areas of the image where the selected attribute is compact and decreasing the value of the selected attribute in areas where the selected attribute is not compact.

5. The method of claim 1, further comprising comparing the compactness of the attribute with a predetermined threshold to determine an amount of the modification.

6. The method of claim 1 further comprising tagging the image to signify the method has been applied.

7. The method of claim 1, where the method is executed depending upon the presence of a tag signifying that a modification has been previously applied.

8. The method of claim 1, where the selected attribute is modified depending upon the presence of a tag signifying that a modification has been previously applied.

9. The method of claim 1, further comprising filtering the distribution values by location.

10. The method of claim 1, further comprising filtering the distribution values by a size.

11. The method of claim 1, further comprising weighting the distribution values by predetermined weights depending on the selected attribute.

12. The method of claim 1, further comprising weighting the compactness results by predetermined weights depending on the selected attribute.

13. A system for modifying perceptual quality of an image, said system comprising:

a memory for storing data and a computer program;

a processor coupled to said memory for executing said computer program, said computer program comprising instructions for;

determining, for each of a plurality of predetermined attributes, distribution values for that attribute, the distribution values being determined from a spatial distribution of the attribute across the image;

determining compactness of the distribution values for each of the attributes, said compactness being a measure of spatial localisation of the distribution values for the respective attribute;

selecting an attribute from the plurality of predetermined attributes based on the determined compactness of the respective distribution values;

modifying the selected attribute in a part of the image, so as to modify the perceptual quality of the image; and

storing the image, according to the modified attribute, in a computer readable storage medium.

14. An apparatus for modifying perceptual quality of an image, said apparatus comprising:

means for determining, for each of a plurality of predetermined attributes, distribution values for that attribute, the distribution values being determined from a spatial distribution of the attribute across the image;

means for determining compactness of the distribution values for each of the attributes, said compactness being a measure of spatial localisation of the distribution values for the respective attribute;

means for selecting an attribute from the plurality of predetermined attributes based on the determined compactness of the respective distribution values;

means for modifying the selected attribute in a part of the image, so as to modify the perceptual quality of the image; and

means for storing the image, according to the modified attribute, in a computer readable storage medium.

15. A computer readable storage medium having a program recorded there for modifying perceptual quality of an image, said program comprising:

code for determining, for each of a plurality of predetermined attributes, distribution values for that attribute, the distribution values being determined from a spatial distribution of the attribute across the image;

code for determining compactness of the distribution values for each of the attributes, said compactness being a measure of spatial localisation of the distribution values for the respective attribute;

code for selecting an attribute from the plurality of predetermined attributes based on the determined compactness of the respective distribution values;

code for modifying the selected attribute in a part of the image, so as to modify the perceptual quality of the image; and

code for storing the image, according to the modified attribute, in a computer readable storage medium.