Unsolved how get quick grabing of Qimage from QCameraimagecapture capture()
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@SGaist
sorry for late reply
I am using Qt Creator 4.8.2
Based on Qt 5.11.3 (GCC 8.3.0, 32 bit) in Raspberry pi 4 with raspi-camera imx477 ,to grab image from camera to make image process in high speed manner (qtwidget) -
@Balaji-G said in how get quick grabing of Qimage from QCameraimagecapture capture():
I am using Qt Creator 4.8.2
Based on Qt 5.11.3 (GCC 8.3.0, 32 bit)That's not your Qt version, that's the Qt version your QtCreator uses.
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@Pl45m4
QMake version 3.1
Using Qt version 5.11.3 in /usr/lib/arm-linux-gnueabihf -
What kind of high speed image processing do you want to do ?
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@SGaist
i Have to grab image for vision project with opencv in high speed (with in 100-200 ms) for total process including image processing. by using QCameraImageCapture it grab correct frame, but method capture() for Qimage emits a signal(int,const QImage &) make delay upto 100-150ms -
When you use OCV, why you want to use
QCamera...
? OCV is more powerful when it comes to some special image processing. -
@Pl45m4
initially started project with opencv videocapture method to grab image from raspberry camera but it gives buffer(past image ).tried to solve that issues ,atlast got some hacks to get latest(current) image but not efficient ,I also tried raspicam_cv lib but its grabing time is little high ,in Qcamera gives current and exact image but method capture() emits a signal with delay of 100-150ms -
Can you describe your exact pipeline ?
From capturing to final step. -
@SGaist
for camera in raspberry pi Iam using v4l2 driver -
I meant the business logic from the camera to the screen.