Sumix SMX-150M - Manual (Page 43)

Tuning Guidelines
43 SMX-150M USB2.0 Camera User Guide
Frequency
The Frequency drop-down box provides values for the pixel clock frequency of the
sensor. The lower the frequency, the higher the maximum possible exposure time and
the less the frame rate is. This control defines the frequency of polling the camera for its
image stream.
Decimation
Use the Decimation drop-down box to decimate (sub-sample) the picture by 2. The
decimation means excluding pixels and rows from the scan process (every second pixel
and second row for the 1:2 decimation). This mode thus allows viewing the picture at
the higher frame rate.
The higher decimation can be used for preview, when the full 1280 x 1024 image is
displayed as 640 x 512 with the frame rate two times higher.
Viewport
Viewport is a rectangular area of the sensor on which the image is scanned. It can have
variable size: from the full sensor field of view to the small area of 8 x 8 pixels. The
smaller vertical size (in lines) of the viewport, the faster the scan process and the higher
the frame rate is.
To change the viewport:
1 Press Alt+v on the keyboard
OR
Click the Settings… button below Viewport (pix)
OR
Click the Viewport Settings button on the toolbar:
2 The Viewport Settings window will open.