bytedeco/javacv

How to reduce the elapsed time on work to OpenCVFrameGrabber

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#2,251 opened on Jul 9, 2024

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Description

This code is Take picture with camera connnected in PC.

private static FrameGrabber grabber = null;

grabber = OpenCVFrameGrabber.createDefault(0);
                grabber.setImageWidth(1280);
                grabber.setImageHeight(720);
                grabber.start();
                if (grabber == null) {
                    return null;
                }
                frame = grabber.grab();
                FrameConverter converter = new Java2DFrameConverter();

                BufferedImage img = (BufferedImage) converter.convert(frame);

but this code running time is 13sec. I want reduce time in 5sec. Why spend time too long and What can I do?

Contributor guide

Research direction
Check the OpenCVFrameGrabber initialization time and grabber.grab() time separately. Consider reducing image resolution, using a different frame grabber (like FFmpegFrameGrabber), or optimizing camera settings. Also check if the first grab is slow due to camera warm up.
Tech stack
java
Domain
desktop
Issue type
Performance
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
JavaOpenCV
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40