JPS57201329A - Forecast encoding and decoding device - Google Patents

Abstract

PURPOSE: To interpolate signals so that pictures are prevented from being deteriorated in a forecast encoding and decoding device using a two-dimensional forecasting function by composing the forecasting function of a forecasting device of only a sampling picture element on a present line or a line of the even number before the preset line.

CONSTITUTION: A picture signal inputted to an input terminal 1 is AD converted. An adder 5 adds the AD converted signal to a forecasting error signal outputted from a forecasting device 6 whose forecasting function is composed of only a quantized forecasting error signal from a quanlizer 4 and a sampling picture element on a line of even number before the present line and an adding circuit 8 adds a control signal such as a forecasting selection signal to select a one-dimensional forecasting device or a two-dimentional forecasting device to the output of the adder 5 and sends the added value through an output terminal 9. In a receiving side, a quantized forecasting error signal supplied from a code reverse converter 13 and a forecasting signal supplied from a forecasting device 15 are added and the decoded signal is supplied to an interpolating circuit 16. An interpolation discriminating circuit 19 discriminates an error line by using a parity check signal and a forecasting device selecting signal and the interpolating circuit 16 interpolates the error line.

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