image - matlab心电图直方图

Question

我想问如何找到心电图图像的直方图？由于我的程序给出了以下错误：

Function IMHIST expected its first input, I or X, to be two-dimensional.

Error in ==> imhist>parse_inputs at 216
iptcheckinput(a, {'double','uint8','logical','uint16','int16','single'}, ...

Error in ==> imhist at 57
[a, n, isScaled, top, map] = parse_inputs(varargin{:});

我的程序是：

Im1 = imread('pic1.jpg');Im = im2double(Im1);figure,imhist(Im)

Answer 1

最有可能的是，图像存储为 RGB。因此，您必须将其转换为灰度：

Im1 = imread('pic1.jpg');
Im = im2double(Im1);
Im = rgb2gray(Im); %# convert to grayscale
figure,imhist(Im)