The software for optical signals registration “FemtoScan VideoSense”

The program is intended for video signal registration, the preliminary analysis, calculation of the set parameters and their record for the subsequent processing. Any videocameras with USB-interface can be used as video signal source .

You can see one or two video signals in the program window, one of them serves for the general control over a system condition (Review), the second is used for calculation of parameters (Sensor). The signal of a sensor is processed and displayed in a videocapture window.
It is possible to subject signal from the sensor to following processing:

• Image rotating (Rotate)
• Trimming of the image (Left, Top, Right, Bottom)
• The Threshold filtration (Threshold)
• Averaging by a matrix 5х5 (Average)
• Subtraction of a base level (Remove background)
• Normalization of a signal by intensity (Normalize intensity)

The processed image from a sensor shares vertically on two parts in the set proportion, by each part value on following algorithm is calculated:

• Search of a maximum, its vertical coordinate is made Ymax
• The sums of intensity above and below of a maximum are considered Sh and Sl
• There is a difference between them Sdiff=Sh-Sl

In a log-file (Log file) values Ymax and Sdiff for each part of the image is writed down.

The history of signal Sdiff for each part of the image is displayed in the schedule form in the bottom part of the program window.The removal time of a signal is across postponed, on a vertical – value of a signal, normalized on following algorithm :

1. The maximum of absolute rejection Ymax from initial value Ymax0 (during the moment of sensor start ) is searched – MAX_Y.
2. The maximum of absolute value Sdiff for all signal history is searched – MAX_S.
3. Signal Sdiff  is normalized by equation Sdiff’=Sdiff*MAX_Y/MAX_S*Scale, where Scale – the scale equal to the size of 1 sensor matrix pixel .
   

The deduced signal is averaged by the set time window (Average window), duration of a deduced signal is set by parameter Time Window.
In order to prevent overflow of computer memory at long experiment, two threshold values are established:

• History Max Samples – The top threshold
  
• History Min Samples – The bottom threshold

After achievement of the top threshold of readout number stored in the memory, values are erased up to the bottom threshold.