opencv4nodejs | Nodejs bindings to OpenCV 3 and OpenCV | Computer Vision library

You need to export a function which accepts the cv and makes it available in your module. So something like bellow:

1.Running npm install with sudo might be causing a permissions problem. You could try completely removing the node_modules directory and re-running npm install it without sudo.

1. Also make sure you have permission to write to the directory you're installing in?

2. If it still doesn't work plz follow this : sudo npm install -g opencv4nodejs --unsafe-perm=true --allow-root

What exactly are you trying to achieve? Only add the masked part from bg to fg or remove the masked part on fg before that? I don't think you are applying the mask correctly.

The following approach should work to apply the mask:

• If the mask is binary: use bitwise_and with bg and mask
• If the mask needs to be grayscale: use element-wise multiplication

The resulting masked_bg will only contain the masked part of the image. Also note that output.jpg is too bright because you are simply adding the two images on top of each other. You could change the weights to 0.5 each or make sure the colored parts of both images never overlap.

As our friend @Eldar commented adding node-loader to vue.config.js works for me. Thank you

You have a few problems with your question.

First of all color_map only has 5 elements, yet the expected result has index from 0 to 5 (6 elements), I assume that was a mistake and you just want the real indexes.

Second of all nowhere in your code is the value index assigned so I'm just gonna assume, it's the next available index, and use push property instead.

Since you don't actually want to return multidimentional array but just the 2d array of indexes, there is no point in returning the imageData.

Granted the condition you explained in the comments section that color map values will be the only things present you could try to do:

In order to access any element in dimension higher than 3d you will need to use the at function and pass it an array. Here is the formal c++ documentation of the function.

For example:

The command CXXFLAGS=-std=c++11=-Wno-c++11-narrowing npm i -g opencv4nodejs sets the CXXFLAGS variable to "-std=c++11=-Wno-c++11-narrowing" and runs the npm command.

But you don't really want the -std compiler option set to "c++11=-Wno-c++11-narrowing" - what you really want is two parameters separated by a space.

The problem is that you can't just stick in a space because CXXFLAGS=-std=c++11 -Wno-c++11-narrowing ... tries to run a command called "-Wno-c++11-narrowing".

The solution is to escape the space with a backslash so that the shell doesn't interpret it as the delimiter between the variable and the command.

What you really want is: