How to merge a contour plot with the image it is derived from

Hello, I have this challenge of overlaying a contour plot with that of the image from which it was derived, as both images now have different scale axes. The program I used is attached along with the relevant mat file, jpg file from which the mat file was obtained and the resultant merged image I obtained. Please help. Thank you.

Z = load('Ir_6707.mat');
  flds = fieldnames(Z);% Fieldnames of data.
  field = flds{1};% First field in data structure.
  A = Z.(field);
  B = -272.+A;% converts from kelvin to celsius
  H = fspecial('average');% Creates predefined average 2_D filter
  image = imfilter(B,H);% Applies filter to image
  contour(flipud(image));
  [C,h] = contour(interp2(flipud(image),'spline'));
  clabel(C,h);
  hold on
  imagesc(flipud(B));

Answer 1

[Thorsten]

I failed to run your code, because

>> contour(flipud(image));
Error using flipud (line 19)
X must be a 2-D matrix.

I use Matlab R2012a.

Note that you treat A as if is where a matrix of temperature values in Kelvin; but is seems to be an RGB image. Also the correct formula is celsius = kelvin - 273.15.

To show an overlay of the image and the contour:

 Z = load('Ir_6707.mat');
  flds = fieldnames(Z);% Fieldnames of data.
  field = flds{1};% First field in data structure.
  A = Z.(field);
  G = rgb2gray(A);
  H = fspecial('average');%

image = imfilter(G,H);
imshow(A)
contour(image)

[Ogheneochuko]

Thanks. But I am using Matlab R2015a and when I run the program it generates the error below;

    Error using rgb2gray>parse_inputs (line 82)
    MAP must be a m x 3 array.

    Error in rgb2gray (line 37)
    X        = parse_inputs(X);

As such the code is not executed to completion.

[Thorsten]

That's strange. After the first four lines, I get

>> whos A
  Name        Size                Bytes  Class    Attributes
  A         240x320x3            230400  uint8

which is definitely a valid argument for rgb2gray. Are you using a different A or mat-file?