I want to capture a specific ROI (say 20x1800 region) of raspberry pi camera. First, I used the raspistill --roi. It gave me a zoomed image. The same happend with picamera crop method. So I decided to capture the whole image by raspicam and then using OpenCV to crop the image. It gave me a 20-27 frames per second. Isn't there any faster solution?
Asked
Active
Viewed 1,627 times
1
zana zakaryaie nejad
- 11
- 1
- 4
-
Please be more explicit about the **precise** command you used. Please also be a bit clearer about how long it actually takes and why that's too slow. – Mark Setchell Jul 16 '19 at 11:42
-
I didn't use a command for reading the whole image and then cropping it. I wrote a c++ program that includes raspicam to read the frames in 1920x1080 resolution and then uses OpenCV to crop them. The FPS was 20-28 on Raspberry Pi 3 B+. – zana zakaryaie nejad Jul 16 '19 at 14:05
-
I cannot understand. In your question, you said you used `raspistill` followed by `picamera` crop. Now you are saying in your comment you used OpenCV? – Mark Setchell Jul 16 '19 at 14:08
-
Sorry, I just edited the comment. – zana zakaryaie nejad Jul 16 '19 at 14:09
-
I said that the slowness is for reading the whole image and then cropping it. I didn't mention any speed concern for raspistill or crop method. The problem with these two solutions is the zoomed image – zana zakaryaie nejad Jul 16 '19 at 14:11
-
I am still having difficulty understanding - please show the **Minimum Complete Verifiable Example** of your code https://stackoverflow.com/help/minimal-reproducible-example You talk about `raspistill` implying you are capturing still images then you talk about frames per second implying you are capturing video. Which is it please? Please show the simplest possible code and say what you are actually trying to do. – Mark Setchell Jul 16 '19 at 14:40