opencv ruby​​ rgb直方图

Question

我正在尝试使用OpenCV来比较两个RGB图像直方图，为此我想在Ruby中创建一个CVHistogram。我不确定params，因为我的代码有错误：

iplimg = OpenCV::IplImage.decode_image(open(icon).read)
dim = 3
sizes = [8,8,8]
ranges = [[0, 255],[0, 255],[0, 255]]
hist = OpenCV::CvHistogram.new(dim, sizes, OpenCV::CV_HIST_ARRAY, ranges, true)
h = hist.calc_hist([iplimg]) # produce error below

这是错误：

  

/tmp/opencv-tLdZ/opencv-2.4.9/modules/core/src/matrix.cpp:698：错误：   （-5）函数cvarrToMat（OpenCV :: CvStsBadArg）中的未知数组类型

这是正确的方法吗？

Answer 1

iplimg = OpenCV::IplImage.decode_image(open(icon).read) # RGB image

b, g, r = iplimg.split # Split RGB image to 1ch image array [b, g, r]

dim = 3
sizes = [8,8,8]
ranges = [[0, 255],[0, 255],[0, 255]]
hist = OpenCV::CvHistogram.new(dim, sizes, OpenCV::CV_HIST_ARRAY, ranges, true)
h = hist.calc_hist([r, g, b])