Method and apparatus for darker region details using image global information
Inactive Publication Date: 2006-08-17
SAMSUNG ELECTRONICS CO LTD
View PDF4 Cites 8 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
[0010] In another embodiment, the present invention provides an example image processing method based on retinex theory, with at least the following differences compared with the conventional retinex-based algorithms: 1) the example method operates only on a luminance channel while the conventional methods operate on three different color channel (this operation can also reduce computational complexity); and 2) the example method reduces and essentially eliminates shading and color distortion problems.
Problems solved by technology
There remains, however, a substantial difference between how an image is perceived by a person and an image captured and reproduced on a display medium.
Despite the improvements gained by conventional digital image processing systems, such systems are still deficient in reproducing an image with the same level of detail, color constancy, and lightness of an actual scene as the eye, brain, and nervous system of a human being.
Each have their respective limitations however.
If a region comprises pixels having low light values, detail is lost because there is very little gradient between the light values for each pixel.
However, one problem associated with these non-linear systems is that they provide greater distinctions between pixels regardless of what lightness value a pixel may have been originally assigned.
This results in the brighter areas which already have a “washedout” appearance to become even more washed-out.
Although these techniques result in better details in the darker regions, they do so at the expense of the brighter areas of the digital image.
Further, these methods cannot handle contours and abrupt boundaries well.
However, such techniques are unsatisfactory for a number of reasons.
In another technique a shift in color occurs in some images (i.e., color distortion) and is computationally intensive.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0015] A example method and apparatus of improving details in a digital image according to an embodiment of the present invention is described. Accordingly, details for a digital image are enhanced while brightness and color constancy are preserved. At a given point (e.g., pixel) in the image, a determination is made as to whether the pixel “path elements” constituting a path are brighter or darker than the point. The output of the given point is adjusted to generate an enhanced value from averaging the outputs of path-computations selected against the given point.
[0016]FIG. 1 shows a block diagram of an image processing system 10 according to an embodiment of the present invention. An image is captured and digitized in block 100 according to well-known techniques, wherein the digitized image is represented by discrete areas referred to as pixels. In one example, the digitized image comprises three color channels, which are Red, Green, and Blue channels (also known as RGB). The col...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more PUM
Login to view more Abstract
A method for processing a digital input image data indexed to represent positions on a display such that the digital data is indicative of an intensity value for each position. The intensity value for each position is adjusted to generate an enhanced value based on retinex theory by operating only on a luminance channel to essentially eliminate shading and color distortion problems.
Description
FIELD OF THE INVENTION [0001] The present invention relates generally to image processing, and more particularly to a method and apparatus for increasing details in dark regions of an image while maintaining brightness and color constancy. BACKGROUND OF THE INVENTION [0002] Image processing systems are at the heart of digital image revolution. These systems process the captured digital image to enhance the clarity and details of the image using image processing algorithms. Such algorithms result in images that are substantially more accurate and detailed than previously achieved using older analog methods. [0003] There remains, however, a substantial difference between how an image is perceived by a person and an image captured and reproduced on a display medium. Despite the improvements gained by conventional digital image processing systems, such systems are still deficient in reproducing an image with the same level of detail, color constancy, and lightness of an actual scene as ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more Application Information
Patent Timeline
Login to view more IPC IPC(8): G06K9/40
CPCG06T5/007G06T5/90H04N9/64H04N23/00
Inventor LEE, SANGKEUNKIM, YEONG-TAEG
Owner SAMSUNG ELECTRONICS CO LTD
Who we serve
- R&D Engineer
- R&D Manager
- IP Professional
Why Eureka
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Social media
Try Eureka
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap