Question

matlab中的edge函数入口参数如何设置？

如果一个图本身就是黑白的用不用在转换成二维灰度图？
出错的程序如下：
>> I = 'D:\abc.jpg'

I =

D:\abc.jpg

>> [BW,thresh] = edge(I,'canny');
% 返回当前Canny算子边缘检测的阈值
disp('Canny算子自动选择的阈值为：')
disp(thresh)
subplot(121),imshow(BW);
title('自动阈值的Canny算子边缘检测')
BW = edge(I,'Canny',[0.2 0.5]);
% 以阈值为[0.1 0.5]对图像进行Canny算子检测
subplot(122),imshow(BW);
title('阈值为[0.1 0.5]的Canny算子边缘检测')
??? Error using ==> iptcheckinput
Function EDGE expected its first input, I,
to be one of these types:

double, single, uint8, uint16, uint32, int8, int16, int32, logical

Instead its type was char.

Error in ==> edge>parse_inputs at 541
iptcheckinput(I,{'numeric','logical'},{'nonsparse','2d'},mfilename,'I',1);

Error in ==> edge at 197
[a,method,thresh,sigma,thinning,H,kx,ky] = parse_inputs(varargin{:});

恳请路过的大侠帮忙

Answer 1

这种情况下建议用bwperim来提取边缘

Answer 2

I= imread('D:\abc.jpg'); %读入图像

Answer 3

底下不是有错误分析嘛。要将数据格式转化为double, single, uint8, uint16, uint32, int8, int16, int32, logical这几种类型。

Answer 4

下载一个新版本。7太老了。比如2010b。到时你就不会有问题了。

Answer 5

I 必须是灰度图