justadudewhohacks/opencv4nodejs

Vec operators mean() and cross() throw 'is not a function'

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#282 opened on May 2, 2018

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good first issuehelp wanted

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Description

Hi, sorry it is me again. Thanks for fixing the Mat.mean() issue. Now I wanted to use the vec mean() operator and got the following error:

Uncaught Exception:
TypeError: mat.mean(...).mean is not a function

I then tested out all the other vec operators and found that cross() also throws the same exception. All other operators worked fine. Am I doing something wrong? First I was calculating mat.mean() which gave me Vec4 { z: 0, y: 0, x: 0, w: 0 } The result I then used for the vec operator like so mat.mean().mean().

Contributor guide

Research direction
Check the OpenCV bindings for Vec class to ensure mean() and cross() methods are properly exposed and callable on Vec objects returned by Mat.mean().
Tech stack
javascript
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
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Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
JavaScriptOpenCV concepts
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65