JPH03123329U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a diagram showing a data compression circuit for a satellite-mounted optical sensor according to an embodiment of this invention, and FIG. 2 is a diagram showing a conventional data compression circuit for an optical sensor. In the figure, 1...A/D converter, 2...Difference extraction circuit, 3...Sign bit removal circuit, 4...Change distribution calculation circuit, 5...Variable length encoding circuit, 6...
...Output editing circuit 6, 7...Control memory circuit, 8...
...It is an output circuit. It should be noted that the same or equivalent parts in the drawings are designated by the same reference numerals.

Claims (1)

[Scope of utility model registration request] An A/D converter that digitally converts the image data from the detector for each band of the optical sensor, and an A/D converter that temporarily stores the signals of each band and sequentially outputs them in a fixed amount at a time, and also to ensure continuity of data within the band each time. A control memory circuit that stores image data for the final pixel, a difference extraction circuit that generates a difference signal from the previous value of image data, and a code bit that performs encoding to remove the sign bit from the difference signal. a removal circuit, a change distribution calculation circuit that evaluates the spectrum of the difference signal for continuous data of a fixed length in order to generate a variable length code, and a change distribution calculation circuit that generates an efficient variable length code according to the evaluation result of the spectrum. 1. A data compression circuit for an optical sensor, comprising: a long encoding circuit; and an output editing circuit that multiplexes the difference data with related data to generate an output format.