Video Pixel Density

Transforms a video flow into a grid of pixels density. It superimposes a grid and in each cell of the grid it counts the number of light pixels according the threshold. It also calculates the barycenter of the pixels density.

Can be used in motion detection, see /Library/Help Patches/Video/Pixel Density.pat example.

Settings

video in

Video input flow(s).

process time

Total time used for the calculation of the module.

grid width

Number of columns in the grid.

grid height

Number of rows in the grid.

threshold

Pixels that have intensity (lightness) lower than the threshold are ignored.

grid density

Array containing the calculated density. Its length is grid width x grid height and can be connected to a panel-matrix.

barycenter x

Barycenter of the pixels density on X axis (width)

barycenter y

Barycenter of the pixels density on Y axis (height)

nb pixels

Total number of pixels detected.

array points x

List of X coordinates of fulfilled cells as an array.

array points y

List of Y coordinates of fulfilled cells as an array.

array points density

List of density values (number of pixels) of fulfilled cells as an array.

auto scale

When ON, always maintains the output density array in the range [0..1].

contrasted

Increases the contrast of the video input. Can improve the video detection accuracy.

Common Settings

info

show manual

Button. Opens the manual page of the selected object (or of its parent module for a control) in the web browser. If no page exists for this object, an error is traced in the trace panel.

For more details about information/help creation, see create-help-file.

description

Free multi-line text attached to the module, saved with the patch. It is only meant as an internal note for the patch designer: it is not displayed in the interface.

ID's

visible only in god mode, see setup-panel-tab-expert.

unique ID

Read-only, not saved. Current private numeric ID of the object, used internally to identify it (for example as the target of a bind ID).

preset ID

Read-only, not saved. Private ID used to store and recall the values of this control in presets.

recreate ID

Button. Generates a new unique ID, original ID and preset ID for the object. Use it if you experience difficulties in Polyphonic mode or if two objects share the same ID. Preset values and binds referring to the old IDs are lost.

Object Remote Address

absolute

Read-only, not saved. Absolute address of the object in the Usine objects tree, built from the workspace root. This is the address to use to reach the object from scripts, the objects panel or remote messages. Only shown for objects that are registered in the objects list. See objects-address.

local

Read-only, not saved. Address of the object relative to the current patch, valid inside that patch only. See objects-address.

user addr

Free user-defined address for the object (empty by default). When set, the object is also registered in the objects tree under this name, so it can be reached independently of its position in the workspace (the value is also reported in the mouse-over and mouse-down chunks). Changing it rebuilds the objects list. Only available on objects that support a user address. See objects-address.

See also

version 7.0.250121

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