User guide

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SenseCam v2.3 User Guide Page 11 of 31 10/03/2009
more than one camera was worn by one person (e.g. one facing forwards and one facing
back.)
Make Movie: This is a prototype feature to convert a SenseCam image sequence into a self-
contained movie file. To use this option you first need to install Windows Media Encoder
(WME). This is used to perform the final encode to .WMV step and, if it's not installed the
viewer software currently generates an “object not found” error message and aborts. WME
can be downloaded from http://www.microsoft.com/windows/
windowsmedia/forpros/encoder/default.mspx. "Windows Media Encoder 9 Series" is the
only version used in testing. Before clicking the Make Movie button, choose the image run
you want to make into a movie – the dialog box allows you to specify start and end frames
by number, but doesn't currently allow you to preview them while the dialog box is open.
Section 3.6 gives more details on Make Movie options.
Load Sensor Data: Loads in the sensor data
associated with the image sequence and plots each
type of data as a graph with the timeline over which
all the images were captured along the x axis. The
raw sensor data values are plotted, with a black
vertical line at the time corresponding to the picture
displayed in the main window. This display is very
rudimentary and not particularly efficient, but does
provide a quick visualisation of the sensor data. The
„CAM‟ plot shows the reason for each photo capture,
where 1 = timer, 2 = PIR, 4 = light level, 8 = manual
capture. The „RST‟ line (not shown in Figure 8)
shows pulses where the camera is turned on or off.
Double-clicking on the window brings up a dialog
box that allows each of the values to be selected (i.e.
shown on the graph) or deselected (i.e. hidden). By
default they are all shown, including the texton
parameters Chi Sq, Squared and Alpha D (see below).
There is a zoom function which can be used when a
lot of sensor data readings are displayed, this is
activated by using the scroll wheel on a suitably-
equipped mouse. When the sensor data is displayed,
the speed of the "fast forward" and “fast back” image display options will be degraded due
to the sensor data redraw times.
You can supply additional sensor data lines, either by editing the SENSOR.CSV file, or by
creating a new .CSV file in the same format (see later) – you can use any tag you like, and it
will be presented as a separate trace on the graph. This file should be time ordered, as
SENSOR.CSV is, and must have a correctly formed real-time clock line before any of the
new data, and at least on every midnight transition (in order to correctly specify the date).
Calculate Textons: Processes the entire sequence of images to determine which images are
most like each other. This option typically takes a while to run – for example it will likely
take a couple of minutes on a 3GHz processor with 100 images to process. There is
currently no progress bar during this operation – the UI will simply appear to hang until it
has completed – so once it‟s started, it‟s just a case of waiting until it‟s complete… The
Figure 8: Sensor data display