Data compression device, data compression method, and non-transitory computer readable medium

A data compression method executed by a data compression device being a computer which compresses discrete time-series data including a plurality of consecutive values consisting of time-series consecutive one or more data points indicating identical values,

• wherein, assuming that each consecutive value included in the time-series data is a target consecutive value, the data compression method comprising:
• determining that the target consecutive value is noise if a duration of the target consecutive value is less than a designated period and a difference between a value of the target consecutive value and a value of a data point immediately preceding a start point in a time-series manner of the target consecutive value is less than or equal to a difference threshold;
• determining that the target consecutive value is not noise if the duration of the target consecutive value is equal to or greater than the designated period and the difference between the value of the target consecutive value and the value of the data point immediately preceding the start point in a time-series manner of the target consecutive value is less than or equal to the difference threshold;
• and
• generating compressed data being data that:
• does not indicate each consecutive value determined to be noise;
• indicates each consecutive value determined not to be noise;
• and is obtained by compressing the time-series data.

A non-transitory computer readable medium recorded with a data compression program executed by a data compression device being a computer which compresses discrete time-series data including a plurality of consecutive values consisting of time-series consecutive one or more data points indicating identical values,

• the data compression program, assuming that each consecutive value included in the time-series data is a target consecutive value, causing the data compression device to execute a noise determination process including:
• determining that the target consecutive value is noise if a duration of the target consecutive value is less than a designated period and a difference between a value of the target consecutive value and a value of a data point immediately preceding a start point in a time-series manner of the target consecutive value is less than or equal to a difference threshold;
• determining that the target consecutive value is not noise if the duration of the target consecutive value is equal to or greater than the designated period and the difference between the value of the target consecutive value and the value of the data point immediately preceding the start point in a time-series manner of the target consecutive value is less than or equal to the difference threshold;
• and
• generating compressed data being data that:
• does not indicate each consecutive value determined to be noise;
• indicates each consecutive value determined not to be noise;
• and is obtained by compressing the time-series data.