For information on working with Fixed-Point features, refer to the Fixed-Point topic.
System objects that support fixed-point data processing have
fixed-point properties, which you can display for a particular object
the command line.
See Displaying Fixed-Point Properties to set the display of System object fixed-point properties.
The following Computer Vision System Toolbox™ objects support fixed-point data processing.
You can control whether the software displays fixed-point properties with either of the following commands:
at the MATLAB® command line. These commands set the Show fixed-point properties display option. You can also set the display option directly via the MATLAB preferences dialog box. Select the Preferences icon from the MATLAB desktop, and then select System Objects. Finally, select or deselect Show fixed-point properties.
If an object supports fixed-point data processing, its fixed-point properties are active regardless of whether they are displayed or not.
A number of properties affect the fixed-point data processing used by a System object. Objects perform fixed-point processing and use the current fixed-point property settings when they receive fixed-point input.
You change the values of fixed-point properties in the same
way as you change any System object property value. You also use the Fixed-Point Designer™
numerictype object to specify the
desired data type as fixed-point, the signedness, and the word- and
In the same way as for blocks, the data type properties of many
System objects can set the appropriate word lengths and scalings automatically
by using full precision. System objects assume that the target specified
on the Configuration Parameters Hardware Implementation target is
If you have not set the property that activates a dependent
property and you attempt to change that dependent property, a warning
message displays. For example, for the
before you set
Note: System objects do not support fixed-point word lengths greater than 128 bits.
For any System object™ provided in the Toolbox, the fimath settings for any fimath attached to a fi input or a fi property are ignored. Outputs from a System object never have an attached fimath.