opencv学习笔记(三)颜色转换 cvtColor
在我们读取图像时通常会用到imread()函数,里面flags可以决定通道数,来得到我们想要的图像,比如:
-1 按解码得到的方式读入图像;
0 单通道 灰度图;
1 三通道 彩色;
当我们想要其他类型的图像时,这种方法就有一些局限性了,所以我们有必要了解cvtColor 这是一种颜色空间转换函数。
先看源码:
void cvtColor(InputArray src, OutputArray dst, int code, int dstCn = 0);src 输入图像
dst 输出图像
code 代码颜色空间转换代码
dstCn 目标图像中的信道数; 如果该参数为0,则通道的数量自动从SRC和code派生。
可以支持RGB HSV 等颜色空间转换(建议不要使用人脸尝试,有些效果懂的都懂)
代码:
int main()
{Mat img1, img2, img3, img4;img1 = imread("猫1.jpg");imshow("原图", img1);cvtColor(img1, img2, COLOR_RGB2GRAY);imshow("灰度图", img2);cvtColor(img1, img3, COLOR_RGB2HSV);imshow("HSV", img3);cvtColor(img1, img4, COLOR_RGB2BGR);imshow("BGR", img4);waitKey(0);
}
效果图:
附:代码颜色空间转换代码
enum ColorConversionCodes {COLOR_BGR2BGRA = 0, //!< add alpha channel to RGB or BGR imageCOLOR_RGB2RGBA = COLOR_BGR2BGRA,COLOR_BGRA2BGR = 1, //!< remove alpha channel from RGB or BGR imageCOLOR_RGBA2RGB = COLOR_BGRA2BGR,COLOR_BGR2RGBA = 2, //!< convert between RGB and BGR color spaces (with or without alpha channel)COLOR_RGB2BGRA = COLOR_BGR2RGBA,COLOR_RGBA2BGR = 3,COLOR_BGRA2RGB = COLOR_RGBA2BGR,COLOR_BGR2RGB = 4,COLOR_RGB2BGR = COLOR_BGR2RGB,COLOR_BGRA2RGBA = 5,COLOR_RGBA2BGRA = COLOR_BGRA2RGBA,COLOR_BGR2GRAY = 6, //!< convert between RGB/BGR and grayscale, @ref color_convert_rgb_gray "color conversions"COLOR_RGB2GRAY = 7,COLOR_GRAY2BGR = 8,COLOR_GRAY2RGB = COLOR_GRAY2BGR,COLOR_GRAY2BGRA = 9,COLOR_GRAY2RGBA = COLOR_GRAY2BGRA,COLOR_BGRA2GRAY = 10,COLOR_RGBA2GRAY = 11,COLOR_BGR2BGR565 = 12, //!< convert between RGB/BGR and BGR565 (16-bit images)COLOR_RGB2BGR565 = 13,COLOR_BGR5652BGR = 14,COLOR_BGR5652RGB = 15,COLOR_BGRA2BGR565 = 16,COLOR_RGBA2BGR565 = 17,COLOR_BGR5652BGRA = 18,COLOR_BGR5652RGBA = 19,COLOR_GRAY2BGR565 = 20, //!< convert between grayscale to BGR565 (16-bit images)COLOR_BGR5652GRAY = 21,COLOR_BGR2BGR555 = 22, //!< convert between RGB/BGR and BGR555 (16-bit images)COLOR_RGB2BGR555 = 23,COLOR_BGR5552BGR = 24,COLOR_BGR5552RGB = 25,COLOR_BGRA2BGR555 = 26,COLOR_RGBA2BGR555 = 27,COLOR_BGR5552BGRA = 28,COLOR_BGR5552RGBA = 29,COLOR_GRAY2BGR555 = 30, //!< convert between grayscale and BGR555 (16-bit images)COLOR_BGR5552GRAY = 31,COLOR_BGR2XYZ = 32, //!< convert RGB/BGR to CIE XYZ, @ref color_convert_rgb_xyz "color conversions"COLOR_RGB2XYZ = 33,COLOR_XYZ2BGR = 34,COLOR_XYZ2RGB = 35,COLOR_BGR2YCrCb = 36, //!< convert RGB/BGR to luma-chroma (aka YCC), @ref color_convert_rgb_ycrcb "color conversions"COLOR_RGB2YCrCb = 37,COLOR_YCrCb2BGR = 38,COLOR_YCrCb2RGB = 39,COLOR_BGR2HSV = 40, //!< convert RGB/BGR to HSV (hue saturation value), @ref color_convert_rgb_hsv "color conversions"COLOR_RGB2HSV = 41,COLOR_BGR2Lab = 44, //!< convert RGB/BGR to CIE Lab, @ref color_convert_rgb_lab "color conversions"COLOR_RGB2Lab = 45,COLOR_BGR2Luv = 50, //!< convert RGB/BGR to CIE Luv, @ref color_convert_rgb_luv "color conversions"COLOR_RGB2Luv = 51,COLOR_BGR2HLS = 52, //!< convert RGB/BGR to HLS (hue lightness saturation), @ref color_convert_rgb_hls "color conversions"COLOR_RGB2HLS = 53,COLOR_HSV2BGR = 54, //!< backward conversions to RGB/BGRCOLOR_HSV2RGB = 55,COLOR_Lab2BGR = 56,COLOR_Lab2RGB = 57,COLOR_Luv2BGR = 58,COLOR_Luv2RGB = 59,COLOR_HLS2BGR = 60,COLOR_HLS2RGB = 61,COLOR_BGR2HSV_FULL = 66,COLOR_RGB2HSV_FULL = 67,COLOR_BGR2HLS_FULL = 68,COLOR_RGB2HLS_FULL = 69,COLOR_HSV2BGR_FULL = 70,COLOR_HSV2RGB_FULL = 71,COLOR_HLS2BGR_FULL = 72,COLOR_HLS2RGB_FULL = 73,COLOR_LBGR2Lab = 74,COLOR_LRGB2Lab = 75,COLOR_LBGR2Luv = 76,COLOR_LRGB2Luv = 77,COLOR_Lab2LBGR = 78,COLOR_Lab2LRGB = 79,COLOR_Luv2LBGR = 80,COLOR_Luv2LRGB = 81,COLOR_BGR2YUV = 82, //!< convert between RGB/BGR and YUVCOLOR_RGB2YUV = 83,COLOR_YUV2BGR = 84,COLOR_YUV2RGB = 85,//! YUV 4:2:0 family to RGBCOLOR_YUV2RGB_NV12 = 90,COLOR_YUV2BGR_NV12 = 91,COLOR_YUV2RGB_NV21 = 92,COLOR_YUV2BGR_NV21 = 93,COLOR_YUV420sp2RGB = COLOR_YUV2RGB_NV21,COLOR_YUV420sp2BGR = COLOR_YUV2BGR_NV21,COLOR_YUV2RGBA_NV12 = 94,COLOR_YUV2BGRA_NV12 = 95,COLOR_YUV2RGBA_NV21 = 96,COLOR_YUV2BGRA_NV21 = 97,COLOR_YUV420sp2RGBA = COLOR_YUV2RGBA_NV21,COLOR_YUV420sp2BGRA = COLOR_YUV2BGRA_NV21,COLOR_YUV2RGB_YV12 = 98,COLOR_YUV2BGR_YV12 = 99,COLOR_YUV2RGB_IYUV = 100,COLOR_YUV2BGR_IYUV = 101,COLOR_YUV2RGB_I420 = COLOR_YUV2RGB_IYUV,COLOR_YUV2BGR_I420 = COLOR_YUV2BGR_IYUV,COLOR_YUV420p2RGB = COLOR_YUV2RGB_YV12,COLOR_YUV420p2BGR = COLOR_YUV2BGR_YV12,COLOR_YUV2RGBA_YV12 = 102,COLOR_YUV2BGRA_YV12 = 103,COLOR_YUV2RGBA_IYUV = 104,COLOR_YUV2BGRA_IYUV = 105,COLOR_YUV2RGBA_I420 = COLOR_YUV2RGBA_IYUV,COLOR_YUV2BGRA_I420 = COLOR_YUV2BGRA_IYUV,COLOR_YUV420p2RGBA = COLOR_YUV2RGBA_YV12,COLOR_YUV420p2BGRA = COLOR_YUV2BGRA_YV12,COLOR_YUV2GRAY_420 = 106,COLOR_YUV2GRAY_NV21 = COLOR_YUV2GRAY_420,COLOR_YUV2GRAY_NV12 = COLOR_YUV2GRAY_420,COLOR_YUV2GRAY_YV12 = COLOR_YUV2GRAY_420,COLOR_YUV2GRAY_IYUV = COLOR_YUV2GRAY_420,COLOR_YUV2GRAY_I420 = COLOR_YUV2GRAY_420,COLOR_YUV420sp2GRAY = COLOR_YUV2GRAY_420,COLOR_YUV420p2GRAY = COLOR_YUV2GRAY_420,//! YUV 4:2:2 family to RGBCOLOR_YUV2RGB_UYVY = 107,COLOR_YUV2BGR_UYVY = 108,//COLOR_YUV2RGB_VYUY = 109,//COLOR_YUV2BGR_VYUY = 110,COLOR_YUV2RGB_Y422 = COLOR_YUV2RGB_UYVY,COLOR_YUV2BGR_Y422 = COLOR_YUV2BGR_UYVY,COLOR_YUV2RGB_UYNV = COLOR_YUV2RGB_UYVY,COLOR_YUV2BGR_UYNV = COLOR_YUV2BGR_UYVY,COLOR_YUV2RGBA_UYVY = 111,COLOR_YUV2BGRA_UYVY = 112,//COLOR_YUV2RGBA_VYUY = 113,//COLOR_YUV2BGRA_VYUY = 114,COLOR_YUV2RGBA_Y422 = COLOR_YUV2RGBA_UYVY,COLOR_YUV2BGRA_Y422 = COLOR_YUV2BGRA_UYVY,COLOR_YUV2RGBA_UYNV = COLOR_YUV2RGBA_UYVY,COLOR_YUV2BGRA_UYNV = COLOR_YUV2BGRA_UYVY,COLOR_YUV2RGB_YUY2 = 115,COLOR_YUV2BGR_YUY2 = 116,COLOR_YUV2RGB_YVYU = 117,COLOR_YUV2BGR_YVYU = 118,COLOR_YUV2RGB_YUYV = COLOR_YUV2RGB_YUY2,COLOR_YUV2BGR_YUYV = COLOR_YUV2BGR_YUY2,COLOR_YUV2RGB_YUNV = COLOR_YUV2RGB_YUY2,COLOR_YUV2BGR_YUNV = COLOR_YUV2BGR_YUY2,COLOR_YUV2RGBA_YUY2 = 119,COLOR_YUV2BGRA_YUY2 = 120,COLOR_YUV2RGBA_YVYU = 121,COLOR_YUV2BGRA_YVYU = 122,COLOR_YUV2RGBA_YUYV = COLOR_YUV2RGBA_YUY2,COLOR_YUV2BGRA_YUYV = COLOR_YUV2BGRA_YUY2,COLOR_YUV2RGBA_YUNV = COLOR_YUV2RGBA_YUY2,COLOR_YUV2BGRA_YUNV = COLOR_YUV2BGRA_YUY2,COLOR_YUV2GRAY_UYVY = 123,COLOR_YUV2GRAY_YUY2 = 124,//CV_YUV2GRAY_VYUY = CV_YUV2GRAY_UYVY,COLOR_YUV2GRAY_Y422 = COLOR_YUV2GRAY_UYVY,COLOR_YUV2GRAY_UYNV = COLOR_YUV2GRAY_UYVY,COLOR_YUV2GRAY_YVYU = COLOR_YUV2GRAY_YUY2,COLOR_YUV2GRAY_YUYV = COLOR_YUV2GRAY_YUY2,COLOR_YUV2GRAY_YUNV = COLOR_YUV2GRAY_YUY2,//! alpha premultiplicationCOLOR_RGBA2mRGBA = 125,COLOR_mRGBA2RGBA = 126,//! RGB to YUV 4:2:0 familyCOLOR_RGB2YUV_I420 = 127,COLOR_BGR2YUV_I420 = 128,COLOR_RGB2YUV_IYUV = COLOR_RGB2YUV_I420,COLOR_BGR2YUV_IYUV = COLOR_BGR2YUV_I420,COLOR_RGBA2YUV_I420 = 129,COLOR_BGRA2YUV_I420 = 130,COLOR_RGBA2YUV_IYUV = COLOR_RGBA2YUV_I420,COLOR_BGRA2YUV_IYUV = COLOR_BGRA2YUV_I420,COLOR_RGB2YUV_YV12 = 131,COLOR_BGR2YUV_YV12 = 132,COLOR_RGBA2YUV_YV12 = 133,COLOR_BGRA2YUV_YV12 = 134,//! DemosaicingCOLOR_BayerBG2BGR = 46,COLOR_BayerGB2BGR = 47,COLOR_BayerRG2BGR = 48,COLOR_BayerGR2BGR = 49,COLOR_BayerBG2RGB = COLOR_BayerRG2BGR,COLOR_BayerGB2RGB = COLOR_BayerGR2BGR,COLOR_BayerRG2RGB = COLOR_BayerBG2BGR,COLOR_BayerGR2RGB = COLOR_BayerGB2BGR,COLOR_BayerBG2GRAY = 86,COLOR_BayerGB2GRAY = 87,COLOR_BayerRG2GRAY = 88,COLOR_BayerGR2GRAY = 89,//! Demosaicing using Variable Number of GradientsCOLOR_BayerBG2BGR_VNG = 62,COLOR_BayerGB2BGR_VNG = 63,COLOR_BayerRG2BGR_VNG = 64,COLOR_BayerGR2BGR_VNG = 65,COLOR_BayerBG2RGB_VNG = COLOR_BayerRG2BGR_VNG,COLOR_BayerGB2RGB_VNG = COLOR_BayerGR2BGR_VNG,COLOR_BayerRG2RGB_VNG = COLOR_BayerBG2BGR_VNG,COLOR_BayerGR2RGB_VNG = COLOR_BayerGB2BGR_VNG,//! Edge-Aware DemosaicingCOLOR_BayerBG2BGR_EA = 135,COLOR_BayerGB2BGR_EA = 136,COLOR_BayerRG2BGR_EA = 137,COLOR_BayerGR2BGR_EA = 138,COLOR_BayerBG2RGB_EA = COLOR_BayerRG2BGR_EA,COLOR_BayerGB2RGB_EA = COLOR_BayerGR2BGR_EA,COLOR_BayerRG2RGB_EA = COLOR_BayerBG2BGR_EA,COLOR_BayerGR2RGB_EA = COLOR_BayerGB2BGR_EA,//! Demosaicing with alpha channelCOLOR_BayerBG2BGRA = 139,COLOR_BayerGB2BGRA = 140,COLOR_BayerRG2BGRA = 141,COLOR_BayerGR2BGRA = 142,COLOR_BayerBG2RGBA = COLOR_BayerRG2BGRA,COLOR_BayerGB2RGBA = COLOR_BayerGR2BGRA,COLOR_BayerRG2RGBA = COLOR_BayerBG2BGRA,COLOR_BayerGR2RGBA = COLOR_BayerGB2BGRA,COLOR_COLORCVT_MAX = 143
};
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