WO2011128939A1 - 画像描画装置および画像描画方法 - Google Patents
画像描画装置および画像描画方法 Download PDFInfo
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- WO2011128939A1 WO2011128939A1 PCT/JP2010/002738 JP2010002738W WO2011128939A1 WO 2011128939 A1 WO2011128939 A1 WO 2011128939A1 JP 2010002738 W JP2010002738 W JP 2010002738W WO 2011128939 A1 WO2011128939 A1 WO 2011128939A1
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- Prior art keywords
- image
- gradation
- drawing object
- background
- map
- Prior art date
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T11/00—2D [Two Dimensional] image generation
- G06T11/40—Filling a planar surface by adding surface attributes, e.g. colour or texture
Definitions
- the present invention relates to an image drawing apparatus and method for performing image processing with gradation on a drawing object.
- a method using an alpha map is known as a method for realizing a gradation effect on a drawing object.
- an image with gradation is created by combining two images based on the ⁇ value set in the alpha map.
- This method using an alpha map can also be applied to vector map drawing in a navigation apparatus.
- Patent Literature 1 discloses that a gradation is applied so that the background color of a road map approaches a similar color to an arbitrary type of road color as the distance from the present location increases.
- a technique for making a road map easy to see without making the roads inconspicuous is disclosed.
- the conventional image drawing method is configured as described above, when you want to apply gradation to a specific drawing object (such as a road), it is between a background drawing object (such as a background) that is the background of the specific drawing object.
- a background drawing object such as a background
- anti-aliasing processing could not be applied to the image, resulting in a drawing with noticeable jaggy. This is because anti-aliasing processing is not applied when a specific drawing object and a base drawing object are combined based on the ⁇ value.
- the present invention has been made to solve the above-described problems, and provides an image drawing apparatus and an image drawing method capable of applying gradation to a specific drawing object among anti-aliased drawing objects. With the goal.
- the image drawing apparatus and the image drawing method according to the present invention generate two background drawing objects located in a lower layer of the gradation target drawing object, draw the gradation target drawing object on one background drawing object, A source image obtained by performing anti-aliasing processing between the base drawing object and the gradation target drawing object is generated, and the destination image is generated by combining the source images based on the alpha map.
- two background drawing objects located in the lower layer of the gradation target drawing object are generated, the gradation target drawing object is drawn on one of the background drawing objects, and the one background drawing object and the gradation target drawing are drawn.
- Source image with anti-aliasing processing between objects is generated, and source image is composed based on alpha map to generate destination image, so it is possible to apply gradation to anti-aliased source image It is possible to provide a gradation image in which jaggy is not conspicuous.
- FIG. 1 is a block diagram illustrating a configuration of an image drawing apparatus according to the first embodiment.
- the image drawing apparatus 1 includes a control unit 2, a map data acquisition unit 3, a coordinate conversion unit 4, and a gradation drawing unit 5.
- the control unit 2 determines parameters necessary for map drawing, such as a drawing area and a display scale, based on input information from the outside.
- the map data acquisition unit 3 acquires map data in the drawing area from the map database 10 that is an external storage area based on the parameters determined by the control unit 2.
- the map data acquired by the map data acquisition unit 3 is classified according to types such as roads and backgrounds, and is represented by vector data.
- the vector data is expressed in a coordinate system normalized in the latitude and longitude and the map area, and cannot be displayed on the display device as it is.
- the coordinate conversion unit 4 converts the map data expressed in the map coordinate system acquired by the map data acquisition unit 3 into device coordinate system data that can be displayed on the display device.
- the gradation drawing unit 5 performs gradation drawing using the data converted by the coordinate conversion unit 4.
- FIG. 2 is a flowchart showing the operation of the gradation drawing unit
- FIG. 3 is an explanatory diagram showing the processing contents of the gradation drawing unit.
- a drawing object to which gradation is applied is referred to as a gradation target drawing object
- a drawing object that is positioned in a lower layer than the gradation target drawing object, and is not subjected to gradation is referred to as a base drawing object.
- the gradation drawing unit 5 draws a background drawing object and converts it into an image (step ST1 in FIG. 2).
- the background drawing object imaged in step ST1 is duplicated to generate two images of the same background drawing object (step ST2 in FIG. 2, background drawing objects a and b in FIG. 3). Note that step ST2 is not a duplicate, and the image of two background drawing objects may be generated by performing the process of step ST1 again.
- a gradation target drawing object is drawn on one of the background drawing objects to obtain a drawing object (hereinafter referred to as a source image).
- a source image a drawing object
- anti-aliasing processing is performed between the gradation target drawing object and the background drawing object (step ST3 in FIG. 2, source image in FIG. 3).
- an alpha map corresponding to the gradation effect is created (step ST4 in FIG. 2, alpha map in FIG. 3).
- the alpha map defines an ⁇ value corresponding to each pixel of the image.
- the background drawing object generated in step ST2 and the source generated in step ST3 are synthesized based on the ⁇ value set in the alpha map created in step ST4, and a gradation-drawn drawing object (hereinafter referred to as gradation object drawing object) , Referred to as the destination image) (step ST5 in FIG. 2, destination image in FIG. 3).
- the color value D ′ for each image pixel is determined by the following equation (1).
- D′ ⁇ S ⁇ 255 / ⁇ + D ⁇ (1-255 / ⁇ ) (1)
- D ′ is the color value for each pixel of the destination image
- S is the color value of the source image
- D is the color value of the background drawing object.
- step ST5 gradation is applied only to the gradation target drawing object, and since the color values of the two images are the same for the portion below that, the combined result based on equation (1) also has the same color value and no gradation is applied.
- the gradation target drawing object is a road image
- the background drawing object is a background image
- step ST1 the gradation drawing unit 5 draws a background image as a background drawing object, and in step ST2, duplicates the background image or performs reprocessing in step ST1 to generate a road drawing background image.
- step ST3 a road image as a gradation target object is drawn on the road drawing background image to generate a source image, and antialiasing processing is performed between the background image and the road image.
- step ST4 an alpha map corresponding to the gradation effect is created.
- step ST5 the background image generated in steps ST1 and ST2 and the source image generated in step ST3 are combined (alpha blended) based on the ⁇ value set in the alpha map, and a combined image in which gradation is applied to the road image is obtained. Generate. As a result, as shown in the composite image of FIG. 4, it is possible to generate an image in which gradation is applied only to the road that is the gradation target drawing object.
- two background drawing objects located in a lower layer than the gradation target drawing object are generated, the gradation target drawing object is drawn on one of the background drawing objects, and antialiasing is performed.
- a gradation can be applied to the drawing object subjected to the anti-aliasing processing by combining based on the alpha map.
- the image drawing apparatus and method according to the present invention can perform gradation display on an image in which jaggy is not conspicuous, and thus can be applied to a navigation apparatus or the like to provide an image display that is easy to visually recognize.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Processing Or Creating Images (AREA)
- Image Generation (AREA)
- Instructional Devices (AREA)
- Navigation (AREA)
Abstract
Description
このアルファマップを用いた方法は、ナビゲーション装置におけるベクター地図描画にも適用することができる。また、地図描画におけるグラデーション方法として、特許文献1には、現在地より遠方になる程、道路地図の背景色が任意種別の道路色と同系色に近づくようにグラデーションをかけることにより、遠方において任意種別の道路を目立たせなくして道路地図を見やすく構成する技術が開示されている。
図1は、実施の形態1による画像描画装置の構成を示すブロック図である。
画像描画装置1は、制御部2、地図データ取得部3、座標変換部4およびグラデーション描画部5で構成されている。
制御部2は、外部からの入力情報に基づき、描画領域および表示縮尺などの地図描画に必要なパラメータを決定する。地図データ取得部3は、制御部2が決定したパラメータに基づき描画領域内の地図データを、外部の記憶領域である地図データベース10から取得する。地図データ取得部3が取得する地図データは、道路や背景などの種別により分類されており、ベクターデータで表現されている。ここで、ベクターデータは、緯度経度や地図領域内で正規化した座標系で表現されており、そのまま表示デバイス上に表示することはできない。
なお、以下の説明では、グラデーションをかける描画オブジェクトをグラデーション対象描画オブジェクト、当該グラデーション対象描画オブジェクトより下位レイヤーに位置し、グラデーションをかけない描画オブジェクトを下地描画オブジェクトと称する。
D´≒S×255/α+D×(1-255/α) (1)
なお、式(1)におけるD´はデスティネーション画像のピクセル毎のカラー値、Sはソース画像のカラー値、Dは下地描画オブジェクトのカラー値である。
ここでは、描画オブジェクトが地図であり、当該地図の道路にのみグラデーションをかける場合について示す。グラデーション対象描画オブジェクトが道路画像、下地描画オブジェクトが背景画像となる。
Claims (2)
- グラデーション対象描画オブジェクトの下位レイヤーに位置する下地描画オブジェクトを2枚生成し、前記一方の下地描画オブジェクト上に前記グラデーション対象描画オブジェクトを描画すると共に、前記一方の下地描画オブジェクトおよび前記グラデーション対象描画オブジェクト間にアンチエイリアス処理を実行したソース画像を生成し、前記ソース画像をアルファマップに基づき合成してデスティネーション画像を生成するグラデーション描画部を備えたことを特徴とする画像描画装置。
- グラデーション対象描画オブジェクトの下位レイヤーに位置する下地描画オブジェクトを描画する描画ステップと、
前記下地描画オブジェクトを複製、または再描画して2枚の下地描画オブジェクトを生成する複製/再描画ステップと、
前記一方の下地描画オブジェクト上に前記グラデーション対象描画オブジェクトを描画すると共に、前記一方の下地描画オブジェクトおよび前記グラデーション対象描画オブジェクト間にアンチエイリアス処理を実行したソース画像を生成するソース画像生成ステップと、
前記ソース画像をアルファマップに基づき合成してデスティネーション画像を生成する合成ステップとを備えたことを特徴とする画像描画方法。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/641,320 US20130038630A1 (en) | 2010-04-15 | 2010-04-15 | Image drawing device and image drawing method |
JP2012510452A JP5383906B2 (ja) | 2010-04-15 | 2010-04-15 | 画像描画装置および画像描画方法 |
DE112010005480T DE112010005480T5 (de) | 2010-04-15 | 2010-04-15 | Bild zeichnende Vorrichtung und Bild zeichnendes Verfahren |
PCT/JP2010/002738 WO2011128939A1 (ja) | 2010-04-15 | 2010-04-15 | 画像描画装置および画像描画方法 |
CN201080066181.8A CN102844792B (zh) | 2010-04-15 | 2010-04-15 | 图像描绘装置以及图像描绘方法 |
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PCT/JP2010/002738 WO2011128939A1 (ja) | 2010-04-15 | 2010-04-15 | 画像描画装置および画像描画方法 |
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WO2011128939A1 true WO2011128939A1 (ja) | 2011-10-20 |
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US (1) | US20130038630A1 (ja) |
JP (1) | JP5383906B2 (ja) |
CN (1) | CN102844792B (ja) |
DE (1) | DE112010005480T5 (ja) |
WO (1) | WO2011128939A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9607430B2 (en) | 2012-02-10 | 2017-03-28 | Mitsubishi Electric Corporation | Gradation drawing device |
Families Citing this family (1)
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CN103903587B (zh) * | 2012-12-27 | 2017-07-21 | 腾讯科技(深圳)有限公司 | 一种处理图片数据的方法及装置 |
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JP2000047575A (ja) * | 1998-07-31 | 2000-02-18 | Matsushita Electric Ind Co Ltd | 地図表示装置 |
JP2002298154A (ja) * | 2001-01-26 | 2002-10-11 | Sony Computer Entertainment Inc | 画像処理プログラム、画像処理プログラムを記録したコンピュータ読み取り可能な記録媒体、プログラム実行装置、画像処理装置、及び画像処理方法 |
JP2005077750A (ja) * | 2003-08-29 | 2005-03-24 | Toshiba Corp | 表示装置装置および文字表示制御方法 |
JP2007140842A (ja) * | 2005-11-17 | 2007-06-07 | Namco Bandai Games Inc | プログラム、情報記憶媒体、及び画像生成システム |
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JPH0758938A (ja) * | 1993-08-11 | 1995-03-03 | Ricoh Co Ltd | 画像編集装置 |
JP3360398B2 (ja) | 1994-03-16 | 2002-12-24 | 日産自動車株式会社 | 車載用ナビゲーション装置 |
US6252604B1 (en) * | 1997-01-10 | 2001-06-26 | Tom Snyder Productions, Inc. | Method of animating an image by squiggling the edges of image features |
JP2001307126A (ja) * | 2000-02-17 | 2001-11-02 | Sony Computer Entertainment Inc | 画像描画方法、画像描画装置、記録媒体及びプログラム |
US7024054B2 (en) * | 2002-09-27 | 2006-04-04 | Eastman Kodak Company | Method and system for generating a foreground mask for a composite image |
AU2002952382A0 (en) * | 2002-10-30 | 2002-11-14 | Canon Kabushiki Kaisha | Method of Background Colour Removal for Porter and Duff Compositing |
US20060197851A1 (en) * | 2005-03-07 | 2006-09-07 | Paul Vlahos | Positioning a subject with respect to a background scene in a digital camera |
JP4386006B2 (ja) * | 2005-06-28 | 2009-12-16 | ソニー株式会社 | 撮影装置および方法、プログラム、並びに記録媒体 |
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2010
- 2010-04-15 WO PCT/JP2010/002738 patent/WO2011128939A1/ja active Application Filing
- 2010-04-15 JP JP2012510452A patent/JP5383906B2/ja not_active Expired - Fee Related
- 2010-04-15 DE DE112010005480T patent/DE112010005480T5/de not_active Ceased
- 2010-04-15 US US13/641,320 patent/US20130038630A1/en not_active Abandoned
- 2010-04-15 CN CN201080066181.8A patent/CN102844792B/zh not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2000047575A (ja) * | 1998-07-31 | 2000-02-18 | Matsushita Electric Ind Co Ltd | 地図表示装置 |
JP2002298154A (ja) * | 2001-01-26 | 2002-10-11 | Sony Computer Entertainment Inc | 画像処理プログラム、画像処理プログラムを記録したコンピュータ読み取り可能な記録媒体、プログラム実行装置、画像処理装置、及び画像処理方法 |
JP2005077750A (ja) * | 2003-08-29 | 2005-03-24 | Toshiba Corp | 表示装置装置および文字表示制御方法 |
JP2007140842A (ja) * | 2005-11-17 | 2007-06-07 | Namco Bandai Games Inc | プログラム、情報記憶媒体、及び画像生成システム |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US9607430B2 (en) | 2012-02-10 | 2017-03-28 | Mitsubishi Electric Corporation | Gradation drawing device |
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DE112010005480T5 (de) | 2013-01-24 |
JPWO2011128939A1 (ja) | 2013-07-11 |
US20130038630A1 (en) | 2013-02-14 |
CN102844792A (zh) | 2012-12-26 |
CN102844792B (zh) | 2016-05-25 |
JP5383906B2 (ja) | 2014-01-08 |
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