bytedeco/javacv

The blobFromImage function returns an abnormal result

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#2,095 opened on Sep 11, 2023

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Description

This is my code,the width and height of the blob are always -1. Mat img = opencv_imgcodecs.imread(imagePath); Mat blob = opencv_dnn.blobFromImage(img, 1.0, new Size(640, 640), new Scalar(0.0), true, false, CV_32F);

Contributor guide

Research direction
Verify that the image is loaded correctly (non null) and check the blobFromImage parameters, especially the size and scalars. Ensure the OpenCV version is compatible.
Tech stack
java
Domain
computer vision
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
Java
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70