Multimedia data recording apparatus, monitor system, and multimedia data recording method
First Claim
1. A monitoring system comprising:
- a multimedia data recording apparatus comprising;
a layer classifier that classifies multimedia data into a plurality of hierarchical layers according to data contents or data precision;
a recorder that continuously records data classified into said layers in a memory; and
a data amount reducer that, when vacant capacity of said memory is at or below a threshold value, performs deletion in an order starting with data classified into a lower layer of said hierarchical layers among data recorded in said memory;
said monitoring system further comprising;
a measurer that measures frequency of access to data recorded in said memory; and
a changer that changes at least one or a plurality of layers in which data whose frequency of access is greater than or equal to a predetermined value among data recorded in said memory to a protected layer that is not subject to data amount reduction by said data amount reducer.
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Accused Products
Abstract
A multimedia data recording apparatus is disclosed that enables large-volume recorded data to be recorded for a long period in accordance with the importance of the data, by means of a simple configuration and simple processing, and without imposing a heavy load on the system. In this apparatus, a layer classification section classifies video data captured by a surveillance camera and input via a video processing section into a plurality of layers on a frame-by-frame basis according to importance. A data recording section assigns a file to each layer and records classified data in a data recording medium. If an information amount reduction section detects that the vacant capacity of the data recording medium has reached or fallen below a threshold value, it deletes a frame belonging to the lowest layer among the plurality of layers.
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Citations
5 Claims
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1. A monitoring system comprising:
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a multimedia data recording apparatus comprising; a layer classifier that classifies multimedia data into a plurality of hierarchical layers according to data contents or data precision; a recorder that continuously records data classified into said layers in a memory; and a data amount reducer that, when vacant capacity of said memory is at or below a threshold value, performs deletion in an order starting with data classified into a lower layer of said hierarchical layers among data recorded in said memory; said monitoring system further comprising; a measurer that measures frequency of access to data recorded in said memory; and a changer that changes at least one or a plurality of layers in which data whose frequency of access is greater than or equal to a predetermined value among data recorded in said memory to a protected layer that is not subject to data amount reduction by said data amount reducer. - View Dependent Claims (2, 3, 4, 5)
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Specification