@prescient-devices-oss/node-red-contrib-usb-camera

This module is a front-end to the fswebcam utility to enable image capturing from within Node-RED. This node is disabled if fswebcam is not detected.

Inputs

Mode

There are four capture modes:

• Template: the node output is a string with a fully specified HTML img tag. The image is included as a Base64-encoded string.

• Encode: the node output is a Base64-encoded string with the image information.

• Buffer: the node output is an array of numbers with the image information.

• File: the node output is a string with the full path of the image file.

Format

Supported image formats are JPEG and PNG.

File name

When the mode is File this input selects the location of the output image file, which is also communicated in the node output. The default is ${NODERED_HOME}/image.[png|jpg]. The specified directory is created if it does not exist.

Size

Width x height, both have to be greater than zero. The default is 320x240.

Quality

Number between 1 and 100 that determines the amount of compression in the captured image. 100, the default, indicates no compression.

Brightness

Percentage that sets the relative image brightness. The default is 50%. This setting may not be available in all cameras, in which case it is ignored.

Contrast

Percentage that sets the relative image contrast. The default is 50%. This setting may not be available in all cameras, in which case it is ignored.

Saturation

Percentage that sets the relative image saturation. The default is 50%. This setting may not be available in all cameras, in which case it is ignored.

Hue

Percentage that sets the relative image hue. The default is 50%. This setting may not be available in all cameras, in which case it is ignored.

Delay

Approximate delay in milliseconds between the input message and the moment the image is captured. The default is no delay.

Name

Node name.

Output

The node output depends on the input Mode:

• Template: string with a fully specified HTML img tag. The image is included as a Base64-encoded string.

• Encode: Base64-encoded string with the image information.

• Buffer: array of numbers with the image information.

• File: string with the full path of the image file.

Copyright 2020 Prescient Devices, Inc.

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