Spatial bandwidth testing for digital data-compressed video syst

Details Spatial bandwidth testing for digital data-compressed video syst Spatial bandwidth testing for digital data-compressed video syst

1992-02-14

1993-05-25

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

382 43, 382 17, H04N 1700

Patent

active

052145085

ABSTRACT:
Spatial bandwidth testing for digital data-compressed video systems is performed using a complex, or high entropy, test signal. A portion of the test signal is acquired as a control frame. This control frame is divided into a plurality of blocks. Each block is processed by a two-dimensional Discrete Fourier Transform (DFT). The test signal is input to a digital data-compressed video system and a corresponding portion of the output of the video system, a test frame, is acquired and processed in the same manner as the control frame. The resulting coefficient arrays from the control and test frames are compared to each other to obtain an output array of ratios for each block. The ratio of those coefficients corresponding to the predominant frequency of each block of the control frame are displayed as a three-dimensional gain plot. The ratio of those coefficients corresponding to low frequencies of each block of the control frame are displayed as a three-dimensional noise plot. The resulting plots provide an objective, visual indication of the characteristics of the digital data-compressed video system.

REFERENCES:
patent: 4843631 (1989-06-01), Steinpichler et al.
patent: 4855826 (1989-08-01), Wischermann et al.
patent: 5038210 (1991-08-01), Deckelmann et al.
patent: 5101441 (1992-03-01), Yamaguchi

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