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2D Numeric Cross-Correlation

Apply a numeric kernel to a matrix using valid-only placement.

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A useful toolkit for text, data, images and calculations.

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2D numeric cross correlation online

Apply a numeric kernel to a matrix using valid-only placement. Use this when inspecting structured input or preparing a data or code artifact. Generated commands and configurations remain text until you review and use them yourself.

How to use it

Paste JSON matching the structure in the example. Supply kernel matrix in the second input. Choose Run tool. Review the output, then copy or download it.

Worked examples

Use this when inspecting structured input or preparing a data or code artifact. Generated commands and configurations remain text until you review and use them yourself.

Reproducible worked example

Settings: No additional settings.

Input:

[[1,2,3],[4,5,6],[7,8,9]]

Kernel matrix:
[[1,0],[0,-1]]

With the input and settings above, the tool produces:

Output:

[
  [
    -4,
    -4
  ],
  [
    -4,
    -4
  ]
]

The example returns 2 top-level items in an array.

Choose the right tool

The operation is two-dimensional cross-correlation: the kernel is not flipped as in mathematical convolution. Use the reported definition when comparing results with another library.

Limitations and common mistakes

Valid cross-correlation without kernel reversal, padding or image-channel interpretation.
Combined input is bounded to 150,000 characters; output text is bounded to 1.2 million characters. Some algorithms impose smaller limits, stated in their error messages.
Both inputs must follow their own documented format. Changing direction or mode can require different input; the example is for the displayed settings.

Frequently asked questions

What format should I enter?

Paste JSON matching the structure in the example. The second input is kernel matrix. The worked example shows the supported structure and actual output.

How can I cross-correlate a numeric grid online?

Paste JSON matching the structure in the example. Supply kernel matrix in the second input. Choose Run tool. Review the output, then copy or download it.

Where is my input processed?

The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.