A method for storing compressed data indicative of an analog signal and reproducing that analog signal from the compressed data. The analog signal to be stored is superimposed on a rectangular coordinate system. An elementary interval is defined on the X-axis of an X-Y coordinate system for the selection of a first series of points, a second series of points (R.sub.1, R.sub.2, R.sub.3) is determined by establishing a threshold ratio between the chord (C.sub.1, C.sub.1 ') separating two non-consecutive points and the sum of the chords (C.sub.1, C.sub.2, C.sub.3 ; C.sub.1 ', C.sub.2 ', C.sub.3 ') separating each of the consecutive points within two non-consecutive points. An interval (N) between these two non-consecutive points is selected to correspond to the maximum ratio below this threshold. The analog signal is reconstituted by generating a signal having a curve that is plotted by establishing between each group of three non-consecutive points a parabola with respect to the axis of symmetry corresponding to the axis of the elementary intervals.
A handwritten letter recognition system comprises a reading unit and a recognition unit which are connected to a local area network. In the reading unit, a handwritten letter is read by a reading section to change the read handwritten letter into handwritten letter information, and the information is compressed by a compressing/expanding section and transmitted to the recognition unit via an interface through a transmission path. In the recognition unit, the transmitted information is expanded by a compressing/expanding section and recognized by a recognition section, and the recognition result is compressed by a compressing/expanding section in response to a request for transmission sent from one of terminal units provided on the local area network including the reading unit and sent through the transmission path to the terminal unit which sent the transmission request.
The data flow rate of a first series of sample values generated over time is reduced to a rate acceptable for real time plotting by generating a second series of sample values where each sample in the second series is representative of a plurality of samples in the first series. The times of the representative values are representative of the times of nonplotted values. Plotting density is increased by plotting only representative values and/or representative time points.
This is a method and associated implementation logic for plotting circles with a pen plotter to obtain a substantial and unexpected increase in throughput of the plotter when plotting circles having a radius equal to or smaller than a small radius lower limit. The method comprises the steps of, employing an independently calculated chord length and number of chords at the independently calculated chord length for plotting circles having a radius greater than the small radius lower limit; and, employing a maximum chord length which is not separately discernable to the naked eye in a circle of a desired radius and an associated number of maximum length chords when plotting a circle having a radius equal to or smaller than the small radius lower limit. In tested embodiments, the method has provided a twelve-fold increase in plotter throughput when plotting small radius circles.
A method and system for generating a completed payment document ready for signature in image form. The document is signed by a customer and a copy of the signature is captured in digital form. Thereafter the signature is encrypted and saved along with a digital record of the transaction.
A method of capturing the coordinates of a handwritten signature and compressing the coordinate data so obtained. The signature is captured in real time by a device such as a stylus-operated digitizer. Compression is performed by examining the location of the signature points relative to a series of guide lines extending in the strokewise direction. The data is stored in compressed form for use in subsequent transactions requiring authorization by the signature which has been so captured.
