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公开(公告)号：EP1492356A3
公开(公告)日：2005-11-23
申请号：EP04077170.1
申请日：1999-11-12
申请人： CNH Canada Ltd.
CPC分类号： H04N9/735
摘要： A method of identifying pixels of a given color in a field of YUV video manipulates color difference signals (R-Y, B-Y) corresponding to defining axes (U, V) of a color space to maximize the video signal in a region of interest of the space, and minimize the signal in all other regions. Additionally, the color difference signal corresponding to one axis may be rotated toward the other axis, or the entire color space may be rotated to bring the region of interest onto or near one of the axes. The signal gains and rotations may be carried out in the signal processing circuits of a conventional color camera (12) so that only one comparator is needed to detect target color. After rotation and application of gain, the color difference signal defining the region of interest is compared with a threshold value to determine if a pixel is of the target color. A video camera may be mounted on an agricultural sprayer to detect green weeds on the brown soil, by identifying the green pixels in the image captured while the sprayer travels in the field. A spray material may be released upon the weed once the weed is detected.
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公开(公告)号：EP1492356A2
公开(公告)日：2004-12-29
申请号：EP04077170.1
申请日：1999-11-12
申请人： CNH Canada Ltd.
CPC分类号： H04N9/735
摘要： A method of identifying pixels of a given color in a field of YUV video manipulates color difference signals (R-Y, B-Y) corresponding to defining axes (U, V) of a color space to maximize the video signal in a region of interest of the space, and minimize the signal in all other regions. Additionally, the color difference signal corresponding to one axis may be rotated toward the other axis, or the entire color space may be rotated to bring the region of interest onto or near one of the axes. The signal gains and rotations may be carried out in the signal processing circuits of a conventional color camera (12) so that only one comparator is needed to detect target color. After rotation and application of gain, the color difference signal defining the region of interest is compared with a threshold value to determine if a pixel is of the target color. A video camera may be mounted on an agricultural sprayer to detect green weeds on the brown soil, by identifying the green pixels in the image captured while the sprayer travels in the field. A spray material may be released upon the weed once the weed is detected.
摘要翻译： 摄像机具有曝光和色彩平衡调节单元。 基于前一场的亮度来调整一场视频的曝光和色平衡设置。 彩色增强装置还包括独立权利要求。
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