Patent number 8565523 is assigned to
The following quote was obtained by the news editors from the background information supplied by the inventors: "This disclosure relates to color balancing based on the content of a digital image.
"Digital images are being used in a rapidly increasing number of applications. In many of those applications, automated analysis of digital images can be performed to enhance the picture quality. The quality of a digital image is often dependent on color levels and color intensity. For example, when capturing a digital photo, characteristics of the ambient environment, such as lighting or reflections off objects, may negatively impact the color representation of the digital picture such that subsequent adjustment of the colors may be desirable. Color balancing of such images tends to be challenging because the importance of particular color aspects (e.g., hue, saturation, chroma, colorfulness, value or lightness, and luminance) tends to vary from image to image. For example, some images may benefit from color adjustments to environmental elements such as grass, air, or water, while other images may benefit from color adjustments to human faces, or other body parts, and their corresponding skin tones."
In addition to the background information obtained for this patent, VerticalNews journalists also obtained the inventors' summary information for this patent: "This disclosure describes, among other things, a color space, along with corresponding techniques, systems and computer programs or software, that facilitate color balancing of at least a portion of a digital image based on the image content.
"In general, an aspect of the subject matter described in this disclosure can be implemented in methods performed by one or more software processes that include shifting the colors of essentially any feature in a digital image towards a desired reference color for the selected feature. The method includes designating a reference color in essentially any color space and determining a region of interest within a digital image. Further, the method includes converting the digital image and the reference color into a modified color space by applying a predetermined gamma value and transforming the digital image and reference color into an opponent color space. Generally, an opponent color space is defined by separate luminance and chromatic channels. The method further includes a color balancing process that may be performed in the opponent color space based on the difference of at least one channel of an average color, determined for the region of interest, and the reference color. Other embodiments of this aspect include corresponding apparatus, methods, and computer program products.
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