A temporal arithmetic average of a large number of frames is produced by utilising as many buffers as required to store the accumulated total. The incoming video signal is sampled at a spacing of 10 fields (5Hz for PAL or 6Hz for NTSC) to enable time for the ALU to perform the required manipulations and LUT changes. Synchronisation may be provided either manually or by computer control of the VTR. Note that if periods exceeding 51s for PAL or 42.5s for NTSC are specified, then there will be a short gap in the accumulation process through the need to make a copy of the high order byte.
This option produces a time series for multiple lines and/or columns in real time. The option supports both manual and computer synchronistion of the VTR.
Menu providing facilities to record, play and edit DigImage movies. The frame rate and resolution achievable are a compromise limited by the speed of the PC and its hard disk.
Time series may be generated, with a sampling rate of even multiples of the field rate (ie. multiples of the frame rate). Multiple points may be processed (the maximum number depends on the speed of the PC - if too many are specified, then an error message is generated), with up to 256K individual readings. The time series are optionally available in an INTEGER*1 binary file (which also stores the number of points and the number of samples) and/or displayed on a buffer. The option [W Time series of window means] performs a similar process, but sampling the mean intensity of a list of windows rather than individual points.
This menu provides direct control over the DTR line of COM1. The purpose of this control is to turn on or off an exterior device such as a liquid crystal shutter or laser. [S Shutter control signal] provides the ability to pulse the DTR line in time with the video system.
This option is intended to produce a square wave output whose timings are derived from the scanning of video frames. The signal has a frequency equal to the frame rate (ie. half the field rate) with independent control over the start and end points of the pulse provided the pulse starts in the first (even) field and finishes in the second (odd) field. The original purpose of this option was to generate timings for a liquid crystal shutter or a pulsed laser to be used in conjunction with a video camera. The aim was to expose the even and odd fields at close to the same instant in time, thus reducing the time lag between the two fields in the frame. The timing singal is available on the DTR line of COM1 (normally connected to Audio channel 2 input of the VTR). This signal may be used for a variety of other timing purposes such as triggering a strobe lamp.
This option is similar to [;TS Shutter control signal] except that it offers greater flexibility and the ability to have duty cycles extending over many frames in time. The timing singal is available on the DTR line of COM1 (normally connected to Audio channel 2 input of the VTR). This signal may be used for a variety of other timing purposes such as triggering a strobe lamp or providing markers on the audio channel of the video tape.
Time series may be generated, with a sampling rate of even multiples of the field rate (ie. multiples of the frame rate). The mean intensity of one or more windows may be sampled. The maximum number and size of the windows depends on the speed of the PC - if too many are specified, or the windows are too large, then an error message is generated. A maximum of 256K individual readings may be gathered. The time series are optionally available in an INTEGER*1 binary file (which also stores the number of points and the number of samples) and/or displayed on a buffer. The option [P Time series of single point(s)] performs a similar process, but sampling the intensity of a list of individual pixels rather than the mean intensities within a list of windows.