Video Capture

Capture video from input video device and send to algorithm

Since R2021a

• 

Libraries:
SoC Blockset / Processor I/O

Description

The Video Capture block simulates behavior of the driver code that captures images from a video device, such as a camera, on your hardware board. The input of this block must be connected to an Video Capture Interface block that simulates a physical video source device on the hardware board. Place this block inside a task and connect it to an algorithm to process an image each time the task executes. For more information on tasks, see Timer-Driven Task and Event-Driven Tasks.

Ports

Input

msg — Data message from video capture interface

scalar

This message port receives data messages from a connected Video Capture Interface block. The messages process when the Task Manager block triggers task containing the Video Capture block. For more information on messages, see Messages.

Data Types: SoCData

Output

Color — Color component of image

height-by-width matrix

This port outputs a height-by-width matrix for that Color component, where the dimensions are the size of the image. The Image size parameter specifies the height and width dimensions.

Dependencies

The Pixel format parameter sets the color component format as either RGB or YCbCr 4:2:2.

Data Types: uint8

Parameters

Image size — Image size

160x120 (default) | 320x240 | 640x480 | 800x600 | custom

Specify the height and width dimensions of the image matrix emitted by the color channel ports of this block. Specify custom to set custom image dimensions.

Image size ([width, height]) — Image size

[320, 240] (default) | 2-element vector of positive integers

Specify custom height-by-width dimensions of the image matrix emitted by the color channel ports.

Dependencies

To enable this parameter, set the Image size parameter to custom.

Pixel format — Format of the pixel data

RGB (default) | YCbCr 4:2:2

Specify the image data encoding as RGB or YCbCr 4:2:2 triplets.

Sample time — Sample time in seconds

-1 (default) | positive scalar

If used in a timer-driven task, enter the sample time of the task defined in the Task Manager block. If used in the event-driven task, enter -1.

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. For more information on generating code for SoC designs, see Use SoC Builder to Generate SoC Design.

• To generate and execute C code for your SoC models, this block requires Embedded Coder^® and SoC Blockset™ Support Package for Embedded Linux^® Devices.

• To use this block, you must set Hardware Board to Embedded Linux Board. You can then follow the instructions to configure the board. For more information, see Create an Embedded Linux Device Configuration.

When deployed to a supported hardware board, this block uses the V4L2 driver framework to capture images from video capture devices, such as a camera. To specify the video capture device and event triggers, use the Hardware Mapping tool. For more information on the V4L2 driver framework, see Video4Linux.

Version History

Introduced in R2021a