snapshot
Capture latest RGB image frame from camera
Description
Examples
Use the Camera Board
You can connect to the camera board on the Raspberry Pi hardware, from the MATLAB® software, take a photograph, and record video.
Create a connection from the MATLAB software to the Raspberry Pi® hardware.
mypi = raspi
Note
If you encounter errors after running the above command, try using additional
arguments (as listed in raspi
) or refer to Troubleshoot Connecting Issues to Raspberry Pi Hardware.
Create a connection, mycam
, from the MATLAB software to the camera board on the Raspberry Pi hardware, and set the image
resolution. The connection displays the camera board properties.
mycam = cameraboard(mypi,'Resolution','1280x720')
mycam = Cameraboard with Properties: Name: Camera Board Resolution: '1280x720' (View available resolutions) Quality: 10 (1 to 100) Rotation: 0 (0, 90, 180 or 270) HorizontalFlip: 0 VerticalFlip: 0 FrameRate: 30 (2 to 30) Recording: 0 Picture Settings Brightness: 50 (0 to 100) Contrast: 0 (-100 to 100) Saturation: 0 (-100 to 100) Sharpness: 0 (-100 to 100) Exposure and AWB ExposureMode: 'auto' (View available exposure modes) ExposureCompensation: 0 (-10 to 10) AWBMode: 'auto' (View available AWB modes) MeteringMode: 'average' (View available metering modes) Effects ImageEffect: 'none' (View available image effects) VideoStabilization: 'off' ROI: [0.00 0.00 1.00 1.00] (0.0 to 1.0 [top, left, width, height])
Capture and display a sequence of 10 snapshots on your computer.
for ii = 1:10 img = snapshot(mycam) imagesc(img) drawnow end
Each of the 10 snapshots is the latest image captured by the camera.
If the image is upside down, change its orientation.
mycam.Rotation = 180
You can use the same approach to change the values of other
cameraboard
properties.
Record a 60 second video.
record(mycam,'myvideo.h264',60)
Stop the recording immediately.
stop(mycam)
Copy the video from the board to your computer.
getFile(mypi,'myvideo.h264','C:\MATLAB ')
Delete the video file from the hardware to free up space.
deleteFile(mypi,'myvideo.h264')
Use the Web Camera
You can connect from the MATLAB software to the USB web camera connected to Raspberry Pi board and take a photograph.
Connect the Raspberry Pi to your host computer.
Note
If you have not previously configured your Raspberry Pi, see Install Support for Raspberry Pi Hardware.
Create a connection from the MATLAB software to the Raspberry Pi hardware.
mypi = raspi
Create a connection, wcam
, from the MATLAB software to the USB web camera connected to the Raspberry Pi board,
and set the image resolution. The connection displays the web camera
properties.
wcam = webcam(mypi)
wcam = webcam with properties: Name: '/dev/video0' Resolution: '320x240' AvailableResolutions: {'320x240' '640x480'}
Import and display a sequence of 10 snapshots on your host computer.
for ii = 1:10 img = snapshot(wcam) imagesc(img) drawnow end
Input Arguments
mycamera
— Connection to Camera Board
connection
Connection to a Camera Board, specified as a cameraboard object.
Use the cameraboard
function to create this connection.
Example: mycam
wcam
— Connection to web camera
connection
Connection to a USB Webcam, specified as a webcam object.
Use the webcam
function to create this
connection.
Example: mycam
Output Arguments
img
— RGB image
RGB image
Latest RGB image, returned as an n-by-n-by-3 matrix of values.
Extended Capabilities
C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.
You can also deploy
snapshot
on the Raspberry Pi hardware in MATLAB Online™.
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