JP2003264838A5 - - Google Patents

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JP2003264838A5
JP2003264838A5 JP2002063556A JP2002063556A JP2003264838A5 JP 2003264838 A5 JP2003264838 A5 JP 2003264838A5 JP 2002063556 A JP2002063556 A JP 2002063556A JP 2002063556 A JP2002063556 A JP 2002063556A JP 2003264838 A5 JP2003264838 A5 JP 2003264838A5
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image
difference
still
processing apparatus
image processing
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JP2003264838A (en
JP4136403B2 (en
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動画像を構成する連続した静止画像を入力し、各静止画像において、オブジェクト画像と背景画像の夫々を符号化し、外部に伝送する画像処理装置であって、 前記背景画像を格納する格納手段と、
入力した静止画像と、前記格納手段に格納されている背景画像とで、位置的に対応する領域間の差分を示す差分画像を生成する差分画像生成手段と、
前記差分画像に基づいた値が所定の閾値以上であるか否かを判定する判定手段と、前記判定手段による判定結果に応じて、新たな背景画像として前記静止画像を符号化し、外部に出力する出力手段と
を備えることを特徴とする画像処理装置。An image processing apparatus that inputs continuous still images constituting a moving image, encodes each of an object image and a background image in each still image, and transmits the encoded image to the outside, and a storage unit that stores the background image;
A difference image generating means for generating a difference image indicating a difference between regions corresponding in position between the input still image and the background image stored in the storage means;
A determination unit that determines whether or not a value based on the difference image is equal to or greater than a predetermined threshold value, and encodes the still image as a new background image according to a determination result by the determination unit and outputs the encoded image An image processing apparatus comprising: output means. 更に前記出力手段は、出力した静止画像を前記格納手段に新たな背景画像として格納することを特徴とする請求項１に記載の画像処理装置。  The image processing apparatus according to claim 1, wherein the output unit stores the output still image as a new background image in the storage unit. 前記差分画像生成手段は、前記静止画像、前記背景画像から位置的に対応するブロックを抽出し、前記静止画像、前記背景画像において夫々のブロック間の差分を示す差分ブロックを求めることを特徴とする請求項１または２に記載の画像処理装置。  The difference image generation means extracts a positionally corresponding block from the still image and the background image, and obtains a difference block indicating a difference between the blocks in the still image and the background image. The image processing apparatus according to claim 1. 更に、前記差分ブロックに対して周波数変換を施して係数ブロックを生成する周波数変換手段を備え、
前記判定手段は、前記係数ブロックと所定の比較対象のブロックとの差分絶対和が所定の閾値以上であるか否かを判定することを特徴とする請求項３に記載の画像処理装置。Furthermore, it comprises frequency conversion means for applying a frequency conversion to the difference block to generate a coefficient block,
The image processing apparatus according to claim 3, wherein the determination unit determines whether or not an absolute difference sum between the coefficient block and a predetermined comparison target block is greater than or equal to a predetermined threshold value. 前記差分画像生成手段が前記静止画像、前記背景画像から複数のブロックを抽出し、前記判定手段が所定個数以上のブロックについて前記差分絶対和が少なくとも所定の閾値以上であると判定した場合、前記出力手段は符号化し、外部に伝送する対象として、前記静止画像を出力することを特徴とする請求項４に記載の画像処理装置。  When the difference image generation unit extracts a plurality of blocks from the still image and the background image, and the determination unit determines that the absolute difference sum of at least a predetermined number of blocks is at least a predetermined threshold value, the output 5. The image processing apparatus according to claim 4, wherein the means encodes and outputs the still image as an object to be transmitted to the outside. 前記差分画像生成手段が前記静止画像、前記背景画像から複数のブロックを抽出し、前記判定手段が所定個数以下のブロックについて前記差分絶対和が少なくとも所定の閾値以上であると判定した場合、前記出力手段は、出力する背景画像がない旨を示す信号を出力することを特徴とする請求項４に記載の画像処理装置。  When the difference image generation unit extracts a plurality of blocks from the still image and the background image, and the determination unit determines that the absolute difference sum of at least a predetermined number of blocks is at least a predetermined threshold value, the output The image processing apparatus according to claim 4, wherein the means outputs a signal indicating that there is no background image to be output. 前記静止画像は少なくとも１フレーム以上の静止画像であって、前記判定手段が所定個数以上のブロックについて前記差分絶対和が少なくとも所定の閾値以上であると判定した場合、前記出力手段は符号化し、外部に伝送する対象として、前記１フレーム以上の静止画像のうちいずれか１つの静止画像を出力することを特徴とする請求項５に記載の画像処理装置。  When the still image is a still image of at least one frame and the determination unit determines that the difference absolute sum is at least a predetermined threshold for a predetermined number of blocks or more, the output unit encodes the external image The image processing apparatus according to claim 5, wherein any one of the still images of one frame or more is output as an object to be transmitted to the image processing apparatus. 動画像を構成する連続した静止画像を入力し、各静止画像において、オブジェクト画像と背景画像の夫々を符号化し、外部に伝送する画像処理方法であって、
前記背景画像を所定の格納手段に格納する格納工程と、
入力した静止画像と、前記格納工程で格納されている背景画像とで、位置的に対応する領域間の差分を示す差分画像を生成する差分画像生成工程と、
前記差分画像に基づいた値が所定の閾値以上であるか否かを判定する判定工程と、
前記判定工程による判定結果に応じて、新たな背景画像として前記静止画像を符号化し、外部に出力する出力工程と
を備えることを特徴とする画像処理方法。An image processing method for inputting continuous still images constituting a moving image, encoding each of an object image and a background image in each still image, and transmitting the encoded image to the outside.
A storage step of storing the background image in a predetermined storage means;
A difference image generation step of generating a difference image indicating a difference between regions corresponding to each other in the input still image and the background image stored in the storage step;
A determination step of determining whether a value based on the difference image is equal to or greater than a predetermined threshold;
An image processing method comprising: an output step of encoding the still image as a new background image according to a determination result of the determination step and outputting the encoded image to the outside . コンピュータを請求項１乃至７のいずれか１項に記載の画像処理装置として機能させることを特徴とするプログラム。A program characterized by causing a computer to function as the image processing apparatus according to any one of claims 1 to 7. コンピュータに請求項８に記載の画像処理方法を実行させることを特徴とするプログラム。A program causing a computer to execute the image processing method according to claim 8. 請求項９または１０に記載のプログラムを格納し、コンピュータが読み取り可能な記憶媒体。  A computer-readable storage medium storing the program according to claim 9 or 10.
JP2002063556A 2002-03-08 2002-03-08 Image processing apparatus, image processing method, program, and storage medium Expired - Fee Related JP4136403B2 (en)

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JP2003264838A JP2003264838A (en) 2003-09-19
JP2003264838A5 true JP2003264838A5 (en) 2007-02-22
JP4136403B2 JP4136403B2 (en) 2008-08-20

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US7706440B2 (en) * 2005-02-08 2010-04-27 Hong Kong Applied Science And Technology Research Institute Co., Ltd. Method for reducing bit rate requirements for encoding multimedia data
JP2021022910A (en) * 2019-07-30 2021-02-18 株式会社リコー Communication terminal, communication program, communication method, and communication system

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JP2518503B2 (en) * 1993-03-08 1996-07-24 日本電気株式会社 Screen switching detection method
JPH07131794A (en) * 1993-11-05 1995-05-19 Fujitsu Ltd Method and device for coding picture data
JPH07152779A (en) * 1993-11-29 1995-06-16 Toshiba Corp Processing method for detecting moving picture index and moving picture processor having moving picture index detection processing function
JPH07288806A (en) * 1994-04-20 1995-10-31 Hitachi Ltd Moving image communication system
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