How can I record frame in linux with Realsense Id?

[zeynepkoyun]

@RealSenseCustomerSupport @alexk1976 @mdisg @michalrudowicz I'm working with RealsenseId on linux with command line interface, so I can't view the rendered frame, can I save the image? For example, saving the processed frame when "a" is pressed as seen in the image below?

[benlev]

Uncomment this section in rsid-cli's main.cc:

// Enable this code to enable saving images as ppm files
//
//    std::string filename = "outputimage" +  std::to_string(counter) + ".ppm";
//    FILE* f1 = fopen(filename.c_str(), "wb");
//    fprintf(f1, "P6\n%d %d\n255\n", image.width, image.height);
//    fwrite(image.buffer, 1, image.size, f1);
//    fclose(f1);
//

[zeynepkoyun]

@benlev Thanks for your answer, I'm looking as you stated now, but the commands are written under the "#ifdef RSID_PREVIEW" condition and I tried to remove this condition before, but during compilation, only "rsid-cli" and "rsid-fw-update" files were created on Linux. Therefore, I could not activate "rsid-preview". I would be very happy if you could help with this.

[3dsf]

do you want to use the realSenseID library, or would you be okay to treat it like a camera?

Here is a poor (slow?) example of how to get a preview image without preview enabled
ffmpeg -f video4linux2 -i /dev/video0 -ss 0:0:2 -frames 1 out.jpg -y

There are many other ways to snap a frame with linux while treating it as a camera. In my limited testing, the only time it may fail is if you are asking the device to do another operation at the same time. Try ffplay /dev/video0 and then run authentication and other commands. As of the last firmware I ran the colour space is correct, but the camera will present different colours in full spectrum light (such as sunlight) than you might expect. It is a minor issue, though may cause a twinge in some users; I believe it's caused due to the sensors reading a wider spectrum than is visible to humans.

[zeynepkoyun]

Hi @3dsf @benlev I was able to see the pictures, but I'm looking to record a single frame instead of multiple frames. I would be very happy if you could help me with this subject. "c to capture images from device." Can only one image be saved when clicked?

[3dsf]

I would recommend that you google something like capture frame from webcam with opencv c++

[zeynepkoyun]

google gibi bir şey yapmanı tavsiye ederim capture frame from webcam with opencv c++

@3dsf Thank you for your answer, When I look at the sample codes I want to learn exactly, frames are taken for 3 seconds for the "c" option. As a temporary solution, I try to change the 3sn value here according to my needs.