US 7,609,301 B2Granted

Motion image recording device with compression ratio control

AssigneeSanyo Electric Co., Ltd.

InventorJunya Kaku

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Abstract

A digital video camera (10) includes a CPU (52) mounting a multitasking OS. A plurality of frames of YUV data forming a motion image are recorded in a recording medium (50) in a compressed manner under the control of the CPU 52. Here, a plurality of tasks to be executed by the CPU (52) includes an imaging processing task in relation to a compression process of the plurality frames of the YUV data and a BG processing task in relation to a recording process of a plurality of frames of JPEG data. Furthermore, the imaging processing task includes a determining process for periodically determining a recording processing speed of the JPEG data and a changing process for changing a compression ratio of the YUV data on the basis of the determination result.

Claims9

Dependent claims

A motion image recording apparatus which comprises a processor mounting a multitasking OS, and records a plurality of screens of image data forming a motion image signal in a compressed manner in a recording medium, wherein

a plurality of tasks to be executed by said processor includes
a first task in relation to a compression process of image data, and a second task in relation to a recording process of compressed image data,
said first task includes an adding process for adding, to a predetermined parameter value, a value corresponding to a size of the compressed image data equivalent to a first number of screens, every time that image data corresponding to said first number of screens is compressed,
said second task includes a subtracting process for subtracting, from said predetermined parameter value, a value corresponding to a size of the compressed image data equivalent to a second number of screens, every time that compressed image data corresponding to said second number of screens is recorded, and
said first task includes a changing process for changing a compression ratio of the image data such that said compression ratio becomes higher as said predetermined parameter value becomes larger;
wherein, when another task is executed, the second task is interrupted each time that a transmission by the defined amount is completed.

3 more elements

A motion image recording apparatus with compression ratio control, comprising:

a fetcher for fetching a plurality of screens of image data forming a motion image;
a compressor for compressing the image data of each of screens fetched by said fetcher with reference to a target size;
a recorder for recording compressed image date generated by said compressor in a recording medium;
a first detector for detecting a first size value indicative of a total size of the compressed image data corresponding to a newest predetermined number of screens;
a second detector for detecting a second size value indicative of a total size of the compressed image data that has already been created by said compressor and has not yet been recorded by said recorder;
a divider for dividing a difference value obtained by subtracting said second size value from said first size value by said predetermined number to obtain a divided value;
and
a setter for
setting the divided value as said target size when the divided value obtained by said divider falls between a first preset value and a second preset value that is larger than the first preset Value,
setting said first preset value as said target size when the divided value obtained by said divider is below said first preset value, and
setting said second preset value as said target size when the divided value obtained by said divider is above the second preset value.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/526,900Filed 3 Sep 2003
Priority: JP 2002-26376910 Sep 2002
Published: US 2006/0153539 A113 Jul 2006
Granted: 27 Oct 2009
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

H04N 9/7921
Processing of colour television signals in connection with recording: for more than one processing mode
H04N 23/69
Control of cameras or camera modules: control of means for changing angle of the field of view, e.g. optical zoom objectives or electronic zooming
H04N 5/772
Between a recording apparatus and a television camera: the recording apparatus and the television camera being placed in the same enclosure
H04N 5/781
Using magnetic recording: on disks or drums

Family

US 2006/0153539 A1Pre-grant publication · published 13 Jul 2006
US 7,609,301 B2This patent

From the US filing history. Foreign family members aren’t listed.

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