JP3029513B2 - Image superposition method - Google Patents
Image superposition methodInfo
- Publication number
- JP3029513B2 JP3029513B2 JP4321662A JP32166292A JP3029513B2 JP 3029513 B2 JP3029513 B2 JP 3029513B2 JP 4321662 A JP4321662 A JP 4321662A JP 32166292 A JP32166292 A JP 32166292A JP 3029513 B2 JP3029513 B2 JP 3029513B2
- Authority
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- Japan
- Prior art keywords
- image
- superimposed
- center
- superimposing
- partial
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000000034 method Methods 0.000 title description 15
- 238000003384 imaging method Methods 0.000 claims description 14
- 238000012545 processing Methods 0.000 claims description 10
- 230000003247 decreasing effect Effects 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000013459 approach Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、比較的粗い解像度を持
つ全体像に精細な解像度を持つ部分像を重畳することに
より、特定部分の解像度を高く保ったまま、画像全体の
情報量を低減する画像処理において、重畳領域の境界に
よる違和感を低減し、自然な重畳画像を実現するもので
あり、テレビ電話やテレビ会議などの双方向画像通信、
画像伝送サービスやテレビ放送などの単方向画像通信、
画像情報検索サービスなどの画像蓄積表示サービス、お
よび侵入者や不審者の監視システムなど、画像の伝送、
蓄積、表示を行なう広範囲の産業分野で利用できる画像
重畳方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention reduces the information amount of an entire image while maintaining a high resolution of a specific portion by superimposing a partial image having a fine resolution on an entire image having a relatively coarse resolution. In image processing to reduce the sense of discomfort due to the boundary of the superimposed region, to realize a natural superimposed image, two-way image communication such as videophone and video conference,
One-way image communication such as image transmission services and TV broadcasting,
Image transmission and display services, such as image storage services such as image information search services, and monitoring systems for intruders and suspicious individuals
The present invention relates to an image superimposing method that can be used in a wide range of industrial fields for storing and displaying.
【０００２】[0002]
【従来の技術】画像の伝送、蓄積、表示を行う画像処理
装置においては、画像の特定部分の解像度を高く保った
まま、画像全体の情報量を低減するために、比較的粗い
解像度を持つ全体像に精細な解像度を持つ部分像を重畳
する画像重畳方法が用いられている。従来の画像重畳方
法としては、全体像の重畳部分を消去し、それに部分像
をはめ込む方法が採られていた。2. Description of the Related Art In an image processing apparatus for transmitting, storing, and displaying an image, an image processing apparatus having a relatively coarse resolution in order to reduce the information amount of the entire image while maintaining a high resolution of a specific portion of the image. An image superimposition method of superimposing a partial image having a fine resolution on an image is used. As a conventional image superimposing method, a method has been adopted in which a superimposed portion of an entire image is deleted and a partial image is fitted therein.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、従来の
画像重畳方法では、比較的粗い解像度の全体像に精細な
解像度の画像をはめ込んで画像の重畳を行っているた
め、重畳領域の境界において不連続な解像度差からくる
違和感が大きく、そこに注意が奪われて、画像全体を見
渡すうえで妨害になるなどの問題があった。However, in the conventional image superposition method, since the image is superimposed by embedding the image of the fine resolution into the whole image of the relatively coarse resolution, the discontinuity occurs at the boundary of the superimposition region. There was a problem that the sense of incongruity caused by the large resolution difference was great, and the attention was deprived of it, which hindered the entire image from being viewed.
【０００４】本発明は、上記問題点を解決するためにな
されたものであり、その目的は、重畳領域の境界による
違和感を低減して、画像全体が妨害無く見渡せるととも
に高精細な部分像から詳細な情報が得られる、自然な重
畳画像を実現する画像重畳方法を提供することにある。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to reduce the sense of discomfort due to the boundary of a superimposed region so that the entire image can be seen without obstruction, and a high-resolution partial image can be used. It is an object of the present invention to provide an image superimposing method for realizing a natural superimposed image that can obtain natural information.
【０００５】[0005]
【課題を解決するための手段】上記の目的を達成するた
め、本発明の画像重畳方法においては、広角の撮像系に
より入力された比較的粗い解像度を持つ全体像と、それ
よりも狭角の撮像系により入力された精細な解像度を持
つ部分像とを重畳する手段を有する画像処理装置におい
て、まず、前記全体像の重畳部分の輝度に重畳領域の中
心からの距離に対してなめらかに変化する単調増加する
ような重みを付与するとともに、前記部分像の輝度に重
畳領域の中心からの距離に対してなめらかに変化する単
調減少するような重みを付与し、次に、前記重み付けし
た全体像と前記重み付けした部分像を加算する構成とし
ている。In order to achieve the above object, in the image superimposing method of the present invention, a whole image having a relatively coarse resolution input by a wide-angle imaging system and a narrower angle image having a smaller angle are used. In an image processing apparatus having means for superimposing a partial image having a fine resolution input by an imaging system, first, the luminance of the superimposed portion of the whole image smoothly changes with respect to the distance from the center of the superimposed region. While giving a weight that monotonically increases, the weight of the partial image is given a weight that monotonically decreases with a smooth change with respect to the distance from the center of the superimposed region, and then the weighted whole image and The weighted partial images are added.
【０００６】[0006]
【作用】本発明の画像重畳方法では、まず、全体像の重
畳部分への輝度の重み付けにより、その輝度が重畳領域
の中心で例えば０になり、中心から離れるに従って本来
の輝度に漸近するような滑らかに変調された全体像を得
るとともに、重畳する部分像への輝度の重み付けによ
り、その輝度が重畳領域の中心で本来の輝度を有し、中
心から離れるに従って例えば０に漸近するような滑らか
に変調された部分像を得る。次に、これらを加算するこ
とにより、重畳領域の境界が無く、かつ重畳領域の中心
に向かうに従って徐々に精細な解像度の画像が明瞭に見
えてくる重畳画像を得る。According to the image superimposing method of the present invention, first, the luminance is weighted to the superimposed portion of the whole image so that the luminance becomes, for example, 0 at the center of the superimposed area, and gradually approaches the original luminance as the distance from the center increases. By obtaining a smoothly modulated whole image, and by weighting the luminance of the partial image to be superimposed, the luminance has the original luminance at the center of the superimposed region, and the luminance gradually approaches 0 as the distance from the center increases. Obtain a modulated partial image. Next, by adding these, a superimposed image is obtained in which there is no boundary of the superimposed region and an image with a finer resolution gradually becomes clearer toward the center of the superimposed region.
【０００７】[0007]
【実施例】以下、本発明の実施例を、図面を参照して詳
細に説明する。Embodiments of the present invention will be described below in detail with reference to the drawings.
【０００８】図１は本発明を実施する画像処理装置の構
成例を示す図である。図において、１は広角の撮像系、
２は広角画像変調部、３は狭角の撮像系、４は狭角画像
変調部、５は画像重畳部、６は重畳画像出力部を表して
いる。広角の撮像系１の画像は広角画像変調部２で輝度
が変調されたのち全体像として画像重畳部５に入力さ
れ、狭角の撮像系３の画像は狭角画像変調部４で輝度が
変調されたのち部分像として画像重畳部５に入力され
る。画像重畳部５は、これらの全体像と部分像を重畳し
て重畳画像を重畳画像出力部６を介して出力する。FIG. 1 is a diagram showing an example of the configuration of an image processing apparatus embodying the present invention. In the figure, 1 is a wide-angle imaging system,
Reference numeral 2 denotes a wide-angle image modulator, 3 denotes a narrow-angle imaging system, 4 denotes a narrow-angle image modulator, 5 denotes an image superimposing unit, and 6 denotes a superimposed image output unit. The luminance of the image of the wide-angle imaging system 1 is modulated by the wide-angle image modulating unit 2 and then input to the image superimposing unit 5 as an entire image, and the luminance of the image of the narrow-angle imaging system 3 is modulated by the narrow-angle image modulating unit 4. After that, the image is input to the image superimposing unit 5 as a partial image. The image superimposing unit 5 superimposes the whole image and the partial image and outputs a superimposed image via the superimposed image output unit 6.
【０００９】このような画像重畳装置において実現され
る本発明の画像重畳方法の実施例について、以下に説明
する。An embodiment of the image superposition method of the present invention realized in such an image superposition apparatus will be described below.
【００１０】図２はその実施例を示す画像重畳装置の処
理例の流れ図である。まず、広角の撮像系１により全体
像を入力する。続いて、入力された全体像を、狭角の撮
像系３の撮像範囲の中心からの距離に応じて、なめらか
な２次元単調増加関数で振幅変調する。ここでは、なめ
らかな単調増加関数を、ガウス関数を１から減じた関数 ｙg（ｒ）＝１−ｅｘｐ（−ｒ） により実現する。ここで、ｒは重畳領域の中心からの距
離を表す。FIG. 2 is a flow chart of a processing example of the image superimposing apparatus showing the embodiment. First, the whole image is input by the wide-angle imaging system 1. Subsequently, the input whole image is amplitude-modulated by a smooth two-dimensional monotone increasing function according to the distance from the center of the imaging range of the imaging system 3 having a narrow angle. Here, a smooth monotone increasing function is realized by a function y g (r) = 1−exp (−r) obtained by subtracting the Gaussian function from one. Here, r represents the distance from the center of the overlapping area.
【００１１】次に、狭角の撮像系３により部分像を入力
する。続いて、入力された部分像を、なめらかな２次元
単調減少関数で振幅変調する。ここでは、なめらかな単
調減少関数を、ガウス関数 ｙl（ｒ）＝ｅｘｐ（−ｒ） により実現する。ここで、ｒは重畳領域の中心からの距
離を表す。Next, a partial image is input by the narrow-angle imaging system 3. Subsequently, the input partial image is amplitude-modulated by a smooth two-dimensional monotone decreasing function. Here, a smooth monotone decreasing function is realized by a Gaussian function y l (r) = exp (−r). Here, r represents the distance from the center of the overlapping area.
【００１２】次に、変調された全体像と、変調された部
分像とを画像重畳部５において重畳する。重畳された画
像は、重畳画像出力部６から表示機器、符号化機器、記
録蓄積機器などの外部機器へ出力される。Next, the modulated whole image and the modulated partial image are superimposed in the image superimposing section 5. The superimposed image is output from the superimposed image output unit 6 to an external device such as a display device, an encoding device, or a storage device.
【００１３】本画像重畳方法において、全体像を変調す
る、なめらかな２次元単調増加関数の例を、図３に示
す。横軸は、重畳領域の中心からの距離ｒを表す。縦軸
は、ｒに対する関数の値を表す。また、部分像を変調す
る、なめらかな２次元単調減少関数の例を、図４に示
す。横軸は、重畳領域の中心からの距離ｒを表す。縦軸
は、ｒに対する関数を表す。FIG. 3 shows an example of a smooth two-dimensional monotone increasing function for modulating the whole image in the image superimposing method. The horizontal axis represents the distance r from the center of the overlapping area. The vertical axis represents the value of the function for r. FIG. 4 shows an example of a smooth two-dimensional monotone decreasing function for modulating a partial image. The horizontal axis represents the distance r from the center of the overlapping area. The vertical axis represents a function for r.
【００１４】振幅変調は、 Ｉgo（ｒ）＝ｙg（ｒ）Ｉgi（ｒ） Ｉlo（ｒ）＝ｙl（ｒ）Ｉli（ｒ） なる畳み込み積分操作によって行なう。ここで、Ｉ
go（ｒ）は振幅変調された全体像、ｙg（ｒ）は全体像
を変調するなめらかな２次元単調増加関数、Ｉgi（ｒ）
は変調する対象となる元々の全体像、Ｉlo（ｒ）は振幅
変調された部分像、ｙl（ｒ）は部分像を変調するなめ
らかな２次元単調減少関数、Ｉli（ｒ）は変調する対象
となる元々の部分像、ｒは重畳領域の中心からの距離
を、それぞれ表す。[0014] amplitude modulation is performed by I go (r) = y g (r) I gi (r) I lo (r) = y l (r) I li (r) becomes a convolution operation. Where I
go (r) is an amplitude-modulated whole image, y g (r) is a smooth two-dimensional monotone increasing function that modulates the whole image, I gi (r)
Is the original whole image to be modulated, I lo (r) is the amplitude-modulated partial image, y l (r) is a smooth two-dimensional monotonically decreasing function for modulating the partial image, and I li (r) is the modulation. And r represents the distance from the center of the superimposed region.
【００１５】重畳操作は、 Ｉo（ｒ）＝Ｉgo（ｒ）＋Ｉlo（ｒ） なる加算操作によって行なう。ここで、Ｉgo（ｒ）は振
幅変調された全体像、Ｉlo（ｒ）は振幅変調された部分
像、Ｉo（ｒ）は重畳された処理結果の画像、ｒは重畳
領域の中心からの距離を、それぞれ表す。The superposition operation is performed by an addition operation of I o (r) = I go (r) + I lo (r). Here, I go (r) is the amplitude-modulated whole image, I lo (r) is the amplitude-modulated partial image, I o (r) is the image of the superimposed processing result, and r is from the center of the superimposed region. Respectively represent the distances.
【００１６】以上の処理を行うことにより、重畳部分の
輝度が、重畳領域の中心で０になり、中心から離れるに
したがって１（元々の輝度を示す）に漸近するような、
なめらかな２次元単調増加関数で振幅変調された全体像
が得られるとともに、輝度が重畳領域の中心で１にな
り、中心から離れるにしたがって０に漸近するような、
なめらかな２次元単調減少関数で振幅変調された部分像
が得られる。これらを加算操作で重畳すれば、重畳領域
の境界が無く、かつ重畳領域の中心へ向かうにしたがっ
て徐々に詳細画像が明瞭に見えて来る重畳画像を実現す
ることが可能となる。By performing the above processing, the luminance of the superimposed portion becomes 0 at the center of the superimposed region, and gradually approaches 1 (indicating the original luminance) as the distance from the center increases.
A whole image whose amplitude is modulated by a smooth two-dimensional monotone increasing function is obtained, and the luminance becomes 1 at the center of the superimposition region and gradually approaches 0 as the distance from the center increases.
A partial image amplitude-modulated by a smooth two-dimensional monotone decreasing function is obtained. If these are superimposed by the addition operation, it is possible to realize a superimposed image in which there is no boundary of the superimposed region and a detailed image gradually becomes clearer toward the center of the superimposed region.
【００１７】図５は本画像重畳方法による画像重畳の説
明図である。低解像度の全体像７の中央やや上に、高解
像度の部分像８が重畳されている。ここで、上記したよ
うに、なめらかな関数を用いて変調したのち重畳してい
るため、重畳領域の中心９に近づくにつれて部分像が優
勢になり、重畳領域の境界に近づくにつれて全体像が優
勢となって、低解像度の全体像７と高解像度の部分像８
との境界がわかりにくくなる。FIG. 5 is an explanatory diagram of image superposition by the present image superposition method. A high-resolution partial image 8 is superimposed slightly above the center of the low-resolution whole image 7. Here, as described above, since the image is superimposed after being modulated using a smooth function, the partial image becomes dominant as approaching the center 9 of the superimposed region, and the entire image becomes dominant as approaching the boundary of the superimposed region. The low-resolution whole image 7 and the high-resolution partial image 8
And the boundary between them becomes difficult to understand.
【００１８】なお、上記振幅変調に用いた関数は一例で
あって、他の関数を用いても良いことは言うまでもな
い。このように本発明は、その主旨に沿って種々に応用
され、種々の実施態様を取り得るものである。The function used for the amplitude modulation is an example, and it goes without saying that another function may be used. As described above, the present invention can be variously applied according to the gist and can take various embodiments.
【００１９】[0019]
【発明の効果】以上の説明で明らかなように、本発明の
画像重畳方法によれば、解像度の粗い全体像と精細な部
分像を重畳する場合、重畳領域の境界の解像度の不連続
による違和感が低減され、画像全体が妨害無く見渡せる
とともに、部分像から詳細な情報が得られる、自然な重
畳画像を実現することができる。As is apparent from the above description, according to the image superimposing method of the present invention, when superimposing the entire image having the coarse resolution and the fine partial image, the sense of incongruity due to the discontinuity of the resolution at the boundary of the superimposed region is obtained. Is reduced, the entire image can be seen without interference, and detailed information can be obtained from the partial image, whereby a natural superimposed image can be realized.
【図１】本発明の画像重畳方法を実施するための画像重
畳装置の構成例を示す図FIG. 1 is a diagram showing a configuration example of an image superimposing device for implementing an image superimposing method of the present invention.
【図２】本発明の画像重畳方法の一実施例を示す上記画
像重畳装置の処理例の流れ図FIG. 2 is a flowchart of a processing example of the image superimposing apparatus showing one embodiment of the image superimposing method of the present invention.
【図３】上記実施例において全体像を変調するためのな
めらかな２次元単調増加関数の例を示す図FIG. 3 is a diagram showing an example of a smooth two-dimensional monotone increasing function for modulating the whole image in the embodiment.
【図４】上記実施例において部分像を変調するためのな
めらかな２次元単調減少関数の例を示す図FIG. 4 is a diagram showing an example of a smooth two-dimensional monotone decreasing function for modulating a partial image in the embodiment.
【図５】上記実施例による画像重畳の説明図FIG. 5 is an explanatory diagram of image superposition according to the embodiment.
１…広角の撮像系 ２…広角画像変調部 ３…狭角の撮像系 ４…狭角画像変調部 ５…画像重畳部 ６…重畳画像出力部 DESCRIPTION OF SYMBOLS 1 ... Wide-angle imaging system 2 ... Wide-angle image modulation unit 3 ... Narrow-angle imaging system 4 ... Narrow-angle image modulation unit 5 ... Image superimposition unit 6 ... Superimposed image output unit
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭59−178203（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H04N 5/262 - 5/265 G06T 1/00 - 5/00 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-59-178203 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) H04N 5/262-5/265 G06T 1 / 00-5/00
Claims (1)
い解像度を持つ全体像と、それよりも狭角の撮像系によ
り入力された精細な解像度を持つ部分像とを重畳する手
段を有する画像処理装置において、 まず、前記全体像の重畳部分の輝度に重畳領域の中心か
らの距離に対してなめらかに変化する単調増加するよう
な重みを付与するとともに、前記部分像の輝度に重畳領
域の中心からの距離に対してなめらかに変化する単調減
少するような重みを付与し、次に、前記重み付けした全
体像と前記重み付けした部分像を加算することを特徴と
する画像重畳方法。1. An image having means for superimposing a whole image having a relatively coarse resolution input by a wide-angle imaging system and a partial image having a fine resolution input by a narrow-angle imaging system. In the processing device, first, the luminance of the superimposed portion of the whole image is given a weight that increases monotonically and smoothly changes with the distance from the center of the superimposed region, and the center of the superimposed region is added to the luminance of the partial image. A weight that gives a smooth and monotonically decreasing weight with respect to the distance from, and then adds the weighted whole image and the weighted partial image.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4321662A JP3029513B2 (en) | 1992-12-01 | 1992-12-01 | Image superposition method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4321662A JP3029513B2 (en) | 1992-12-01 | 1992-12-01 | Image superposition method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06178203A JPH06178203A (en) | 1994-06-24 |
| JP3029513B2 true JP3029513B2 (en) | 2000-04-04 |
Family
ID=18135013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4321662A Expired - Fee Related JP3029513B2 (en) | 1992-12-01 | 1992-12-01 | Image superposition method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3029513B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4513906B2 (en) * | 2008-06-27 | 2010-07-28 | ソニー株式会社 | Image processing apparatus, image processing method, program, and recording medium |
-
1992
- 1992-12-01 JP JP4321662A patent/JP3029513B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06178203A (en) | 1994-06-24 |
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