Classifier-based enhancement of digital images

• US 20020118883A1
• Filed: 02/24/2001
• Published: 08/29/2002
• Est. Priority Date: 02/24/2001
• Status: Abandoned Application

• Current Assignee: Neema Bhatt
• Original Assignee: Neema Bhatt
• Inventors: Bhatt, Neema
• Application Number:
  US09/681,212
• Publication Number:
  US 20020118883A1
• Time in Patent Office: Days
• US Class Current: 382/224
• CPC Class Codes: G06T 5/70 Denoising; Smoothing
• CPC Class Codes: G06T 5/73 Deblurring; Sharpening
• CPC Class Codes: G06T 5/90 Dynamic range modification of images or parts thereof
• CPC Class Codes: G06T 7/194 involving foreground-background segmentation
• CPC Class Codes: H04N 1/409 Edge or detail enhancement; Noise or error suppression

Abstract

Embodiment of the present invention receives images from a database. Next, the images are sized and then grouped into different classes by a classifier. After the classification, images in each class are enhanced using steps including the dynamic range management, noise reduction, blur removal, color correction, and background modification. The image files are iteratively ascertained to have smaller than a pre-specified file size. Next, the enhanced images can be pushed back to the database through a variety of means.

Claims

1. A method of enhancing digital images on a computer-readable storage medium using a computer or other like programmable apparatus having a processor and a memory, said method comprising:

receiving images and related pertinent information from a database;

classifying said images into plurality of groups;

enhancing said images in each said group; and

sending said enhanced images to the database.

2. The method of claim 1 wherein said classifier means uses at least one of the methods including fuzzy logic, artificial neural networks, Bayesian, statistical, heuristic, genetic algorithm, and manual.

3. The method of claim 2 wherein classifying means incorporates attributes comprising luminance, noise level, blur, contrast, brightness, colors, dimensions, key words, and descriptors.

4. The method of claim 1 wherein enhancement of each group of images is accomplished using different sets of parameters.

5. The method of claim 4 wherein the enhancement step consists of intermediate steps including dynamic range management, noise reduction, blur removal, color correction, and background modification.

6. The intermediate step of claim 5 wherein dynamic range management comprises the steps of:

selecting parameters based on the classifier grouping;

automated compaction of pixel intensity range;

automated selection of the luminance level; and

automated selection of brightness and contrast.

7. The intermediate step of claim 5 wherein dynamic range management consists of lookup table usage comprising the steps of:

selecting the luminance level from a lookup table; and

selecting brightness and contrast from a lookup table.

10. The intermediate step of claim 5 wherein blur removal comprises the steps of:

selecting parameters based on the classifier grouping;

computing the luminance image;

computing a mask corresponding to main gradients;

deconvolving the image using appropriate blur radius;

replacing the deconvolution results in pixels corresponding to the mask; and

iteratively refining the deblurred images based on an appropriate criterion.

11. The intermediate step of claim 5 wherein blur removal with slightly blurred images can comprise the steps of:

selecting parameters based on the classifier grouping;

computing the luminance image;

selecting parameters based on the classifier output; and

performing unsharp masking.

12. The intermediate step of claim 5 wherein color correction comprises the steps of:

selecting parameters based on the classifier grouping;

selecting the hue, saturation, and luminance values using parameters; and

selecting color balance values using parameters.

13. The intermediate step of claim 5 wherein background modification comprises the steps of:

selecting parameters based on the classifier grouping;

selecting the background region for enhancement; and

adjusting the background attribute from the parameter to improve the appearance of the foreground feature.

14. Method of claim 1 wherein the means for managing image file sizes consists of the steps of:

resizing images according to predefined specification prior to said classification step; and

iteratively refining parameters to attain certain predefined file size during said enhancement step to form the output image.

8. The intermediate step of claim S wherein noise reduction comprises the steps of:

selecting parameters based on the classifier grouping;

computing the luminance image;

selecting regions corresponding to gradient value higher than a prespecified threshold gradient;

rejecting isolated regions of high gradients by using connectedness; and

combining a fraction of the original luminance image back in the smoothed regions.

9. The intermediate step of claim S wherein noise reduction comprises the steps of:

selecting parameters based on the classifier grouping;

computing the luminance image;

selecting the region belonging to the background;

smoothing region in the background; and

combining a fraction of the original luminance image back in the smoothed region.

15. A system of enhancing digital images on a computer-readable storage medium using a computer or other like programmable apparatus having a processor and a memory, the system comprising:

means to receive images and related pertinent information from a database;

means to classify said images into plurality of groups;

means to enhance said images in each said group using different sets of parameters; and

means to send said enhanced images to the database.

16. A method to improve the visual quality of digital images generated from a plurality of imaging devices on a computer-readable storage medium using a computer or other like programmable apparatus having a processor and a memory, the method consisting steps of:

classifying images into a plurality of groups based on attributes;

and enhancing each group of images using different sets of parameters.

17. A system to improve the visual quality of digital images generated from a plurality of imaging devices on a computer-readable storage medium using a computer or other like programmable apparatus having a processor and a memory, the system consisting steps of:

classifying images into a plurality of groups based on attributes;

and enhancing each group of images using different sets of parameters.

18. A method for automation of quality enhancement for digital images acquired from at least one data source, achieved in at least one data base, and posting the output on the internet or intranet using a computer or other like programmable apparatus having a processor and a memory, said method comprising:

receiving images and related pertinent information from a database;

enhancing images automatically with minimal user interaction;

sending said enhanced images to the database; and

posting enhanced images on the internet or intranet with other pertinent information.