Video Capture Interface

Simulate capture of images from video stream on hardware

Since R2021a

Libraries:
SoC Blockset / Peripherals

Description

The Video Capture Interface block simulates the behavior of a video input device. The block emits the captured image in message for a connected Video Capture block that can be used in an algorithm. The block can also emit an event that, when connected a Task Manager block, can trigger a task containing the Video Capture block.

Ports

Input

expand all

data — Image data
`3`MN-length vector

Specify a 3MN-length vector as the unwrapped images matrices.

Dependencies

To enable this port, set the Input parameter to From input port.

Data Types: uint8

Output

expand all

event — Task event signal
scalar

This port sends a message at each new image event. This output connects to the input of the Task Manager block to execute the associated event-driven task after receiving the new image.

Dependencies

To enable this port, select the Show event port parameter.

Data Types: rteEvent

msg — SoC message data
scalar

This port outputs data messages containing image data to a connected Video Capture block.

Data Types: SoCData

Parameters

expand all

Input — Source of simulated video data
`From dialog` (default) | `From input port` | `From timeseries object`

Specify the source of the simulated image data.

Value — Image to be imported
`uint8(floor(rand(1,3160120)*255))` (default) | 3MN-element vector

Specify the simulated image as a vector. The vector gets transformed into three M-by-N matrices representing the color channels of the image source.

Object name — Timeseries object name
[] (default) | MATLAB workspace variable

Specify the video source as a timeseries object in the MATLAB^® workspace.

Sample time — Sample time in seconds
`-1` (default) | positive scalar

Enter the sample time defining the rate at which to output the message containing video data.

Show event port — Option to enable task event ports
`off` (default) | `on`

Select this parameter to enable an event port that, when connected to the Task Manager block, can execute event-driven tasks.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

To automatically generate C code for your design, and execute on an SoC device, use the SoC Builder tool. To generate and execute C code for your SoC models, Embedded Coder^® features are required. For more information on generating code for SoC designs, see Use SoC Builder to Generate SoC Design.

Embedded Coder does not generate code for this block. In the generated code,the V4L2 driver framework performs the video capture on the device. The related Video Capture block represents the V4L2 driver. For more information on the V4L2 driver framework, see Video4Linux.

Version History

Introduced in R2021a

Video Capture Interface

Description

Ports

Input

data — Image data
`3`MN-length vector

Dependencies

Output

event — Task event signal
scalar

Dependencies

msg — SoC message data
scalar

Parameters

Input — Source of simulated video data
`From dialog` (default) | `From input port` | `From timeseries object`

Value — Image to be imported
`uint8(floor(rand(1,3160120)*255))` (default) | 3MN-element vector

Object name — Timeseries object name
[] (default) | MATLAB workspace variable

Sample time — Sample time in seconds
`-1` (default) | positive scalar

Show event port — Option to enable task event ports
`off` (default) | `on`

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

See Also

External Websites

Video Capture Interface

Description

Ports

Input

data — Image data 3MN-length vector

Dependencies

Output

event — Task event signal scalar

Dependencies

msg — SoC message data scalar

Parameters

Input — Source of simulated video data From dialog (default) | From input port | From timeseries object

Value — Image to be imported uint8(floor(rand(1,3*160*120)*255)) (default) | 3MN-element vector

Object name — Timeseries object name [] (default) | MATLAB workspace variable

Sample time — Sample time in seconds -1 (default) | positive scalar

Show event port — Option to enable task event ports off (default) | on

Extended Capabilities

C/C++ Code Generation Generate C and C++ code using Simulink® Coder™.

Version History

See Also

External Websites

data — Image data
`3`MN-length vector

event — Task event signal
scalar

msg — SoC message data
scalar

Input — Source of simulated video data
`From dialog` (default) | `From input port` | `From timeseries object`

Value — Image to be imported
`uint8(floor(rand(1,3160120)*255))` (default) | 3MN-element vector

Object name — Timeseries object name
[] (default) | MATLAB workspace variable

Sample time — Sample time in seconds
`-1` (default) | positive scalar

Show event port — Option to enable task event ports
`off` (default) | `on`

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.