Question

我是matlab的新手，我正在尝试运行一个处理图像的程序。以下是我的代码中适用于该问题的部分。

function result = shadowremoval(image, type, mask)
  % computing size of the image
  s_im = size(image);

  % creating a shadow segmentation if no mask is available
  if (~exist('mask','var'))
      gray = rgb2gray(image);
      mask = 1-double(im2bw(gray, graythresh(gray)));
  end

  % structuring element for the shadow mask buring, and the shadow/light
  % core detection
  strel = [0 1 1 1 0; 1 1 1 1 1; 1 1 1 1 1; 1 1 1 1 1; 0 1 1 1 0];

  % computing shadow/light  core (pixels not on the blured adge of the
  % shadow area)
  shadow_core = imerode(mask, strel);
  lit_core = imerode(1-mask, strel);

  % smoothing the mask
  smoothmask = conv2(double(mask), double(strel/21), 'same');

  % averaging pixel intensities in the shadow/lit areas
  shadowavg_red = sum(sum(image(:,:,1).*shadow_core)) / sum(sum(shadow_core));
  litavg_red = sum(sum(image(:,:,1).*lit_core)) / sum(sum(lit_core));

  % additive shadow removal
  % compiting colour difference between the shadow/lit areas
  diff_red = litavg_red - shadowavg_red;

  % adding the difference to the shadow pixels
  result(:,:,1) = image(:,:,1) + smoothmask * diff_red; %this is line 82

这是我得到的错误：

 Error using  +

 Integers can only be combined with integers of the same class, or scalar doubles.

 Error in shadowremoval (line 82)

 result(:,:,1) = image(:,:,1) + smoothmask * diff_red;

Answer 1

除非使用标量double，否则无法添加整数和双精度数。例如，uint8(8) + 9有效，而uint8(8) + [9 10]则无效（给出的错误与您相同）。

将错误的行替换为

result(:,:,1) = double(image(:,:,1)) + smoothmask * diff_red; %this is line 82

也就是说，在添加之前将整数转换为双精度。

我假设image是整数类型而其他变量是double。你的问题并不是很清楚。

顺便说一下，使用image作为变量名称并不是一个好主意，因为它会影响Matlab函数。

+运算符与matlab中的图像

1 个答案: