Superimpose two images - one on top of the other

I have uploaded two images "Picture 15.jpg" and "Calibration.jpg".

Picture 15.jpg is below:

Calibration.jpg is below:

I want to superimpose the 1st image (picture15) onto the 2nd image (calibration.jpg).

My aim is to show the laser line deviation of the laser line on that 2nd image, i.e, on calibration.jpg.

With my 1st image, picture15.jpg, I want this image's background be totally black except the laser line part, and then superimpose this onto the calibration image.

I am not able to do these things. Can anyone provide me the code or any reference link?

Thank you

[Rik]

Image Analyst has posted a very extensive demo on many techniques related to computer vision on the FEX. That would be a good place to start. I think this might be bit more challenging problem than it seems.

[praveen rai]

wat do you think can anyone provide me the solution here or should i write this problem on another platform if you know some other platform can you suggest me

[Rik]

I would say it should be relatively easy to select only the laser, as the color is quite distinct from the rest of the image. If you insist you can use the binary mask either as AlphaData to superimpose the two images, or use it to overwrite pixels.

Answer 1

[Image Analyst]

See attached m-file.

[praveen rai]

wow!!!really if this is the actual output is coming then u r too good. i wanted the same output @image analyst i will definitely accept your ans but I am understanding the code if i will not understand any line of code i will ping u

[Image Analyst]

If it works, then you can please "Accept this answer".

[praveen rai]

@image analyst questions which i asked in double star mark plzz see it

*Get the red stuff
[redMask, maskedRGBImage] = createMask(rgbImage);

% Fill the mask to get rid of holes.
redMask = imfill(redMask, 'holes');
% Extract the largest blob only.
redMask = bwareafilt(redMask, 1);
** u have written createmask is that a user defined function??
** redMask = bwareafilt(redMask, 1);what does that line means and 'bwareafilt'
*

in your code where is that superimposition part is happening??

[Image Analyst]

Please read this and fix your post: http://www.mathworks.com/matlabcentral/answers/13205#answer_18099

CreateMask is a user written function and is included at the bottom of the m-file I gave you.

bwareafilt() is a function, introduced in R2014b, that lets you say what size blobs to extract. If you give it 1 it returns the largest blob only.

[praveen rai]

% Define thresholds for channel 1 based on histogram settings
channel1Min = 43.890;
channel1Max = 99.999;

how did u get these values

[Image Analyst]

That is code generated by the Color Thresholder app on the Apps tab of the tool ribbon.

[praveen rai]

but how can i get these values because i dont have color Thresholder app i didnt get your point u mean to say i have to use this app i have also seen in ur code that there is written auto generated code from color threshold app

function [BW,maskedRGBImage] = createMask(RGB)
%createMask  Threshold RGB image using auto-generated code from colorThresholder app.
%  [BW,MASKEDRGBIMAGE] = createMask(RGB) thresholds image RGB using
%  auto-generated code from the colorThresholder app. The colorspace and
%  range for each channel of the colorspace were set within the app. The
%  segmentation mask is returned in BW, and a composite of the mask and
%  original RGB images is returned in maskedRGBImage.

% Auto-generated by colorThresholder app on 17-Nov-2017
*@image analyst i dont have this app*

[Image Analyst]

The just get the histograms of each color channel and make a guess based on them.

[praveen rai]

I got the result your code is fine.if i want to change these values if yes then on what basis i can change this..plzz explain it

% Define thresholds for channel 1 based on histogram settings
channel1Min = 43.890;
channel1Max = 99.999;

[praveen rai]

ok i will do this part i will see the histogram i understood your code but i dont know y in your code is written this things auto-generated code from the colorThresholder app its a comment still i want to know

[Image Analyst]

It says that because that code was exported from the Color Thresholder applet when I clicked the Export button. Then I copied and pasted it to my demo m-file which I attached.

[praveen rai]

when i am replacing the caliberation.jpg file with another file it giving me some error

*Attempt to grow array along ambiguous dimension.

Error in superimpose (line 105)

maskedRgbImage(mask3D) = rgbImage(mask3D);*

superimpose is my m-file name

[Image Analyst]

Please attach all the code and images that I need to run and reproduce your error.

[praveen rai]

I am have pasted the images just replace the previous 'calibration.jpg' image with picture 04.jpg'

1st image will be same as picture 15.jpg' I have also attached the code and code is same as u have given.no changes

[praveen rai]

one thing red line which is coming on masked image i want this line be THIN ENOUGH SUCH THAT THEY ARE 1 PIXEL WIDE?

i searched in net I found one link in which u have answered I am pasting that link but I am not getting the result can u recheck with my masked image https://in.mathworks.com/matlabcentral/answers/90394-how-to-make-lines-thin-enough-such-that-they-are-1-pixel-wide (given link)

[Image Analyst]

They are not the same size, so how do you expect it to work? Why even superimpose in that case???? Think this through.

[praveen rai]

it means first I have to make the dimension of both the image same.am I right?/