OpenCV这么简单为啥不学——1.9、cvtColor颜色空间转换(全色值效果演示)

简介: OpenCV这么简单为啥不学——1.9、cvtColor颜色空间转换(全色值效果演示)

OpenCV这么简单为啥不学——1.9、cvtColor颜色空间转换(全色值效果演示)


前言

计算机视觉市场巨大而且持续增长,且这方面没有标准API,如今的计算机视觉软件大概有以下三种:

1、研究代码(慢,不稳定,独立并与其他库不兼容)

2、耗费很高的商业化工具(比如Halcon, MATLAB+Simulink)

3、依赖硬件的一些特别的解决方案(比如视频监控,制造控制系统,医疗设备)这是如今的现状,而标准的API将简化计算机视觉程序和解决方案的开发,OpenCV致力于成为这样的标准API。

OpenCV致力于真实世界的实时应用,通过优化的C代码的编写对其执行速度带来了可观的提升,并且可以通过购买Intel的IPP高性能多媒体函数库(Integrated Performance Primitives)得到更快的处理速度。

故而我们选择学习OpenCV,我们来一步步的学习OpenCV。


cvtColor函数

语法:

cv2.cvtColor(src, code[, dst[, dstCn]]) → dst

参数:

src:img图片

code:色值代码(r,g,b)

dst:返回img

code色值表

 cv::COLOR_BGR2BGRA = 0,

 cv::COLOR_RGB2RGBA = COLOR_BGR2BGRA,

 cv::COLOR_BGRA2BGR = 1,

 cv::COLOR_RGBA2RGB = COLOR_BGRA2BGR,

 cv::COLOR_BGR2RGBA = 2,

 cv::COLOR_RGB2BGRA = COLOR_BGR2RGBA,

 cv::COLOR_RGBA2BGR = 3,

 cv::COLOR_BGRA2RGB = COLOR_RGBA2BGR,

 cv::COLOR_BGR2RGB = 4,

 cv::COLOR_RGB2BGR = COLOR_BGR2RGB,

 cv::COLOR_BGRA2RGBA = 5,

 cv::COLOR_RGBA2BGRA = COLOR_BGRA2RGBA,

 cv::COLOR_BGR2GRAY = 6,

 cv::COLOR_RGB2GRAY = 7,

 cv::COLOR_GRAY2BGR = 8,

 cv::COLOR_GRAY2RGB = COLOR_GRAY2BGR,

 cv::COLOR_GRAY2BGRA = 9,

 cv::COLOR_GRAY2RGBA = COLOR_GRAY2BGRA,

 cv::COLOR_BGRA2GRAY = 10,

 cv::COLOR_RGBA2GRAY = 11,

 cv::COLOR_BGR2BGR565 = 12,

 cv::COLOR_RGB2BGR565 = 13,

 cv::COLOR_BGR5652BGR = 14,

 cv::COLOR_BGR5652RGB = 15,

 cv::COLOR_BGRA2BGR565 = 16,

 cv::COLOR_RGBA2BGR565 = 17,

 cv::COLOR_BGR5652BGRA = 18,

 cv::COLOR_BGR5652RGBA = 19,

 cv::COLOR_GRAY2BGR565 = 20,

 cv::COLOR_BGR5652GRAY = 21,

 cv::COLOR_BGR2BGR555 = 22,

 cv::COLOR_RGB2BGR555 = 23,

 cv::COLOR_BGR5552BGR = 24,

 cv::COLOR_BGR5552RGB = 25,

 cv::COLOR_BGRA2BGR555 = 26,

 cv::COLOR_RGBA2BGR555 = 27,

 cv::COLOR_BGR5552BGRA = 28,

 cv::COLOR_BGR5552RGBA = 29,

 cv::COLOR_GRAY2BGR555 = 30,

 cv::COLOR_BGR5552GRAY = 31,

 cv::COLOR_BGR2XYZ = 32,

 cv::COLOR_RGB2XYZ = 33,

 cv::COLOR_XYZ2BGR = 34,

 cv::COLOR_XYZ2RGB = 35,

 cv::COLOR_BGR2YCrCb = 36,

 cv::COLOR_RGB2YCrCb = 37,

 cv::COLOR_YCrCb2BGR = 38,

 cv::COLOR_YCrCb2RGB = 39,

 cv::COLOR_BGR2HSV = 40,

 cv::COLOR_RGB2HSV = 41,

 cv::COLOR_BGR2Lab = 44,

 cv::COLOR_RGB2Lab = 45,

 cv::COLOR_BGR2Luv = 50,

 cv::COLOR_RGB2Luv = 51,

 cv::COLOR_BGR2HLS = 52,

 cv::COLOR_RGB2HLS = 53,

 cv::COLOR_HSV2BGR = 54,

 cv::COLOR_HSV2RGB = 55,

 cv::COLOR_Lab2BGR = 56,

 cv::COLOR_Lab2RGB = 57,

 cv::COLOR_Luv2BGR = 58,

 cv::COLOR_Luv2RGB = 59,

 cv::COLOR_HLS2BGR = 60,

 cv::COLOR_HLS2RGB = 61,

 cv::COLOR_BGR2HSV_FULL = 66,

 cv::COLOR_RGB2HSV_FULL = 67,

 cv::COLOR_BGR2HLS_FULL = 68,

 cv::COLOR_RGB2HLS_FULL = 69,

 cv::COLOR_HSV2BGR_FULL = 70,

 cv::COLOR_HSV2RGB_FULL = 71,

 cv::COLOR_HLS2BGR_FULL = 72,

 cv::COLOR_HLS2RGB_FULL = 73,

 cv::COLOR_LBGR2Lab = 74,

 cv::COLOR_LRGB2Lab = 75,

 cv::COLOR_LBGR2Luv = 76,

 cv::COLOR_LRGB2Luv = 77,

 cv::COLOR_Lab2LBGR = 78,

 cv::COLOR_Lab2LRGB = 79,

 cv::COLOR_Luv2LBGR = 80,

 cv::COLOR_Luv2LRGB = 81,

 cv::COLOR_BGR2YUV = 82,

 cv::COLOR_RGB2YUV = 83,

 cv::COLOR_YUV2BGR = 84,

 cv::COLOR_YUV2RGB = 85,

 cv::COLOR_YUV2RGB_NV12 = 90,

 cv::COLOR_YUV2BGR_NV12 = 91,

 cv::COLOR_YUV2RGB_NV21 = 92,

 cv::COLOR_YUV2BGR_NV21 = 93,

 cv::COLOR_YUV420sp2RGB = COLOR_YUV2RGB_NV21,

 cv::COLOR_YUV420sp2BGR = COLOR_YUV2BGR_NV21,

 cv::COLOR_YUV2RGBA_NV12 = 94,

 cv::COLOR_YUV2BGRA_NV12 = 95,

 cv::COLOR_YUV2RGBA_NV21 = 96,

 cv::COLOR_YUV2BGRA_NV21 = 97,

 cv::COLOR_YUV420sp2RGBA = COLOR_YUV2RGBA_NV21,

 cv::COLOR_YUV420sp2BGRA = COLOR_YUV2BGRA_NV21,

 cv::COLOR_YUV2RGB_YV12 = 98,

 cv::COLOR_YUV2BGR_YV12 = 99,

 cv::COLOR_YUV2RGB_IYUV = 100,

 cv::COLOR_YUV2BGR_IYUV = 101,

 cv::COLOR_YUV2RGB_I420 = COLOR_YUV2RGB_IYUV,

 cv::COLOR_YUV2BGR_I420 = COLOR_YUV2BGR_IYUV,

 cv::COLOR_YUV420p2RGB = COLOR_YUV2RGB_YV12,

 cv::COLOR_YUV420p2BGR = COLOR_YUV2BGR_YV12,

 cv::COLOR_YUV2RGBA_YV12 = 102,

 cv::COLOR_YUV2BGRA_YV12 = 103,

 cv::COLOR_YUV2RGBA_IYUV = 104,

 cv::COLOR_YUV2BGRA_IYUV = 105,

 cv::COLOR_YUV2RGBA_I420 = COLOR_YUV2RGBA_IYUV,

 cv::COLOR_YUV2BGRA_I420 = COLOR_YUV2BGRA_IYUV,

 cv::COLOR_YUV420p2RGBA = COLOR_YUV2RGBA_YV12,

 cv::COLOR_YUV420p2BGRA = COLOR_YUV2BGRA_YV12,

 cv::COLOR_YUV2GRAY_420 = 106,

 cv::COLOR_YUV2GRAY_NV21 = COLOR_YUV2GRAY_420,

 cv::COLOR_YUV2GRAY_NV12 = COLOR_YUV2GRAY_420,

 cv::COLOR_YUV2GRAY_YV12 = COLOR_YUV2GRAY_420,

 cv::COLOR_YUV2GRAY_IYUV = COLOR_YUV2GRAY_420,

 cv::COLOR_YUV2GRAY_I420 = COLOR_YUV2GRAY_420,

 cv::COLOR_YUV420sp2GRAY = COLOR_YUV2GRAY_420,

 cv::COLOR_YUV420p2GRAY = COLOR_YUV2GRAY_420,

 cv::COLOR_YUV2RGB_UYVY = 107,

 cv::COLOR_YUV2BGR_UYVY = 108,

 cv::COLOR_YUV2RGB_Y422 = COLOR_YUV2RGB_UYVY,

 cv::COLOR_YUV2BGR_Y422 = COLOR_YUV2BGR_UYVY,

 cv::COLOR_YUV2RGB_UYNV = COLOR_YUV2RGB_UYVY,

 cv::COLOR_YUV2BGR_UYNV = COLOR_YUV2BGR_UYVY,

 cv::COLOR_YUV2RGBA_UYVY = 111,

 cv::COLOR_YUV2BGRA_UYVY = 112,

 cv::COLOR_YUV2RGBA_Y422 = COLOR_YUV2RGBA_UYVY,

 cv::COLOR_YUV2BGRA_Y422 = COLOR_YUV2BGRA_UYVY,

 cv::COLOR_YUV2RGBA_UYNV = COLOR_YUV2RGBA_UYVY,

 cv::COLOR_YUV2BGRA_UYNV = COLOR_YUV2BGRA_UYVY,

 cv::COLOR_YUV2RGB_YUY2 = 115,

 cv::COLOR_YUV2BGR_YUY2 = 116,

 cv::COLOR_YUV2RGB_YVYU = 117,

 cv::COLOR_YUV2BGR_YVYU = 118,

 cv::COLOR_YUV2RGB_YUYV = COLOR_YUV2RGB_YUY2,

 cv::COLOR_YUV2BGR_YUYV = COLOR_YUV2BGR_YUY2,

 cv::COLOR_YUV2RGB_YUNV = COLOR_YUV2RGB_YUY2,

 cv::COLOR_YUV2BGR_YUNV = COLOR_YUV2BGR_YUY2,

 cv::COLOR_YUV2RGBA_YUY2 = 119,

 cv::COLOR_YUV2BGRA_YUY2 = 120,

 cv::COLOR_YUV2RGBA_YVYU = 121,

 cv::COLOR_YUV2BGRA_YVYU = 122,

 cv::COLOR_YUV2RGBA_YUYV = COLOR_YUV2RGBA_YUY2,

 cv::COLOR_YUV2BGRA_YUYV = COLOR_YUV2BGRA_YUY2,

 cv::COLOR_YUV2RGBA_YUNV = COLOR_YUV2RGBA_YUY2,

 cv::COLOR_YUV2BGRA_YUNV = COLOR_YUV2BGRA_YUY2,

 cv::COLOR_YUV2GRAY_UYVY = 123,

 cv::COLOR_YUV2GRAY_YUY2 = 124,

 cv::COLOR_YUV2GRAY_Y422 = COLOR_YUV2GRAY_UYVY,

 cv::COLOR_YUV2GRAY_UYNV = COLOR_YUV2GRAY_UYVY,

 cv::COLOR_YUV2GRAY_YVYU = COLOR_YUV2GRAY_YUY2,

 cv::COLOR_YUV2GRAY_YUYV = COLOR_YUV2GRAY_YUY2,

 cv::COLOR_YUV2GRAY_YUNV = COLOR_YUV2GRAY_YUY2,

 cv::COLOR_RGBA2mRGBA = 125,

 cv::COLOR_mRGBA2RGBA = 126,

 cv::COLOR_RGB2YUV_I420 = 127,

 cv::COLOR_BGR2YUV_I420 = 128,

 cv::COLOR_RGB2YUV_IYUV = COLOR_RGB2YUV_I420,

 cv::COLOR_BGR2YUV_IYUV = COLOR_BGR2YUV_I420,

 cv::COLOR_RGBA2YUV_I420 = 129,

 cv::COLOR_BGRA2YUV_I420 = 130,

 cv::COLOR_RGBA2YUV_IYUV = COLOR_RGBA2YUV_I420,

 cv::COLOR_BGRA2YUV_IYUV = COLOR_BGRA2YUV_I420,

 cv::COLOR_RGB2YUV_YV12 = 131,

 cv::COLOR_BGR2YUV_YV12 = 132,

 cv::COLOR_RGBA2YUV_YV12 = 133,

 cv::COLOR_BGRA2YUV_YV12 = 134,

 cv::COLOR_BayerBG2BGR = 46,

 cv::COLOR_BayerGB2BGR = 47,

 cv::COLOR_BayerRG2BGR = 48,

 cv::COLOR_BayerGR2BGR = 49,

 cv::COLOR_BayerBG2RGB = COLOR_BayerRG2BGR,

 cv::COLOR_BayerGB2RGB = COLOR_BayerGR2BGR,

 cv::COLOR_BayerRG2RGB = COLOR_BayerBG2BGR,

 cv::COLOR_BayerGR2RGB = COLOR_BayerGB2BGR,

 cv::COLOR_BayerBG2GRAY = 86,

 cv::COLOR_BayerGB2GRAY = 87,

 cv::COLOR_BayerRG2GRAY = 88,

 cv::COLOR_BayerGR2GRAY = 89,

 cv::COLOR_BayerBG2BGR_VNG = 62,

 cv::COLOR_BayerGB2BGR_VNG = 63,

 cv::COLOR_BayerRG2BGR_VNG = 64,

 cv::COLOR_BayerGR2BGR_VNG = 65,

 cv::COLOR_BayerBG2RGB_VNG = COLOR_BayerRG2BGR_VNG,

 cv::COLOR_BayerGB2RGB_VNG = COLOR_BayerGR2BGR_VNG,

 cv::COLOR_BayerRG2RGB_VNG = COLOR_BayerBG2BGR_VNG,

 cv::COLOR_BayerGR2RGB_VNG = COLOR_BayerGB2BGR_VNG,

 cv::COLOR_BayerBG2BGR_EA = 135,

 cv::COLOR_BayerGB2BGR_EA = 136,

 cv::COLOR_BayerRG2BGR_EA = 137,

 cv::COLOR_BayerGR2BGR_EA = 138,

 cv::COLOR_BayerBG2RGB_EA = COLOR_BayerRG2BGR_EA,

 cv::COLOR_BayerGB2RGB_EA = COLOR_BayerGR2BGR_EA,

 cv::COLOR_BayerRG2RGB_EA = COLOR_BayerBG2BGR_EA,

 cv::COLOR_BayerGR2RGB_EA = COLOR_BayerGB2BGR_EA,

 cv::COLOR_BayerBG2BGRA = 139,

 cv::COLOR_BayerGB2BGRA = 140,

 cv::COLOR_BayerRG2BGRA = 141,

 cv::COLOR_BayerGR2BGRA = 142,

 cv::COLOR_BayerBG2RGBA = COLOR_BayerRG2BGRA,

 cv::COLOR_BayerGB2RGBA = COLOR_BayerGR2BGRA,

 cv::COLOR_BayerRG2RGBA = COLOR_BayerBG2BGRA,

 cv::COLOR_BayerGR2RGBA = COLOR_BayerGB2BGRA,

 cv::COLOR_COLORCVT_MAX = 143

测试代码

import os
import cv2
import shutil
img = '800_600.jpg'
save_dir = 'Demo_img/'
try:
    # 递归删除文件夹
    shutil.rmtree(save_dir)
    os.makedirs(save_dir)
except OSError:
    pass
img = cv2.imread(img)
valid_index = []
for color_type in range(0, 256, 1):
    try:
        img_new = cv2.cvtColor(img, color_type)
        cv2.imwrite(os.path.join(save_dir, str(color_type) + '.jpg'), img_new)
        valid_index.append(color_type)
    except Exception:
        pass
print("有效输出:")
for item in valid_index:
    print(item, end=".jpg,")

实际生成:

效果展示

总结

我们替换了色值以及看到了对应的效果,cvtColor转换之后可以看去与原图的情境相同但是意境不同,不同颜色给别人的感觉也不同,具体那个合适就需要自己定夺了。

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