[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2023-10-06 UTC."],[[["\u003cp\u003eCreates a 3x3 kernel for edge detection using the Laplacian-4 operator.\u003c/p\u003e\n"],["\u003cp\u003eThe kernel can be scaled using the \u003ccode\u003emagnitude\u003c/code\u003e argument and normalized using the \u003ccode\u003enormalize\u003c/code\u003e argument.\u003c/p\u003e\n"],["\u003cp\u003eThe default kernel values are: \u003ccode\u003e[[0, 1, 0], [1, -4, 1], [0, 1, 0]]\u003c/code\u003e.\u003c/p\u003e\n"]]],["The `ee.Kernel.laplacian4()` function generates a 3x3 Laplacian-4 edge-detection kernel. It accepts `magnitude` (float, default 1) to scale kernel values and `normalize` (boolean, default false) to normalize values to sum to 1. The function returns a kernel represented by the weights matrix: `[[0, 1, 0], [1, -4, 1], [0, 1, 0]]`. `magnitude` allows for customization of the kernel's sensitivity.\n"],null,["# ee.Kernel.laplacian4\n\nGenerates a 3x3 Laplacian-4 edge-detection kernel.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|-------------------------------------------------------|---------|\n| `ee.Kernel.laplacian4(`*magnitude* `, `*normalize*`)` | Kernel |\n\n| Argument | Type | Details |\n|-------------|-------------------------|------------------------------------------|\n| `magnitude` | Float, default: 1 | Scale each value by this amount. |\n| `normalize` | Boolean, default: false | Normalize the kernel values to sum to 1. |\n\nExamples\n--------\n\n### Code Editor (JavaScript)\n\n```javascript\nprint('A Laplacian-4 kernel', ee.Kernel.laplacian4());\n\n/**\n * Output weights matrix\n *\n * [0, 1, 0]\n * [1, -4, 1]\n * [0, 1, 0]\n */\n```\nPython setup\n\nSee the [Python Environment](/earth-engine/guides/python_install) page for information on the Python API and using\n`geemap` for interactive development. \n\n```python\nimport ee\nimport geemap.core as geemap\n```\n\n### Colab (Python)\n\n```python\nfrom pprint import pprint\n\nprint('A Laplacian-4 kernel:')\npprint(ee.Kernel.laplacian4().getInfo())\n\n# Output weights matrix\n\n# [0, 1, 0]\n# [1, -4, 1]\n# [0, 1, 0]\n```"]]
