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Detecting and Enhancing Blue and Green Colors in Video and Still Images

IP.com Disclosure Number: IPCOM000129137D
Publication Date: 2005-Sep-28
Document File: 2 page(s) / 41K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method that detects pixels that correspond to pale green and pale blue, and unsaturated green-blue, then applies color corrections in the HSV space. Benefits include correcting faded and true colors.

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Detecting and Enhancing Blue and Green Colors in Video and Still Images

Disclosed is a method that detects pixels that correspond to pale green and pale blue, and unsaturated green-blue, then applies color corrections in the HSV space. Benefits include correcting faded and true colors.

Background

Reproducing green colors using the NTSC/PAL primary does not result in the same colors, due to a difference in the G range; this results in saturation and hue shifts, and may produce unappealing colors (e.g. pale greens).

Most color correction algorithms use a simple color detection scheme that increases saturation to a maximum value, or by a fixed percentage.

General Description

The disclosed method detects pixels that correspond to pale green and pale blue, and unsaturated green-blue, then applies color corrections in the HSV space. The disclosed method improves scenes that contain pale or unsaturated green and blue colors by appropriately increasing the hue and/or saturation (e.g. grass in golf, football, and soccer images can be made to look greener). Figure 1 shows the disclosed method’s blue/green enhancement flowchart.

Advantages

The disclosed method improves scenes that contain pale or unsaturated green and blue colors, including faded and true colors.

Fig. 1

Disclosed anonymously