H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/33
H04N 7/137 (1990.01)
Patent
CA 1292059
ABSTRACT This invention relates to an method for encoding and transmitting an image. A preprocessing step is used for effecting an analog-to-digital conversion on an image input signal to generate a digital signal and for storing the digital signal in a frame memory for each frame. An encoding processing step is used for effecting a smoothing operation on the digital signal based on an encoding control parameter such as a threshold value and for encoding the smoothed digital signal. A transmission control processing step is used to temporarily store the encoded signal for each frame in a transmission data buffer and for sending the encoded signal to a transmission control unit. An encoding control parameter control step is used to control the encoding control parameter. Finally, an auxiliary encoding control parameter control step is used to extract a portion of a current digital signal stored in the frame memory, to effect a pseudo encoding on the portion based on the encoding control, parameter calculated and to correct the encoding control parameter based on an amount of the pseudo encoded signals, thereby causing the encoding control parameter to have an optimum value.
615827
Kirby Eades Gale Baker
Mitsubishi Denki Kabushiki Kaisha
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