WO2013150775A1 - 画像生成装置、カメラ装置、画像表示装置及び画像生成方法 - Google Patents
画像生成装置、カメラ装置、画像表示装置及び画像生成方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims description 13
- 238000003384 imaging method Methods 0.000 claims abstract description 49
- 238000004364 calculation method Methods 0.000 claims description 33
- 238000001514 detection method Methods 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 8
- 238000000605 extraction Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
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- 230000000295 complement effect Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
- H04N7/183—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a single remote source
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T3/00—Geometric image transformations in the plane of the image
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T3/00—Geometric image transformations in the plane of the image
- G06T3/04—Context-preserving transformations, e.g. by using an importance map
- G06T3/047—Fisheye or wide-angle transformations
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T5/00—Image enhancement or restoration
- G06T5/80—Geometric correction
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V20/00—Scenes; Scene-specific elements
- G06V20/50—Context or environment of the image
- G06V20/56—Context or environment of the image exterior to a vehicle by using sensors mounted on the vehicle
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/69—Control of means for changing angle of the field of view, e.g. optical zoom objectives or electronic zooming
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/80—Camera processing pipelines; Components thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/2628—Alteration of picture size, shape, position or orientation, e.g. zooming, rotation, rolling, perspective, translation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2210/00—Indexing scheme for image generation or computer graphics
- G06T2210/22—Cropping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/698—Control of cameras or camera modules for achieving an enlarged field of view, e.g. panoramic image capture
Definitions
- the present invention relates to an image generation apparatus, a camera apparatus, an image processing system, and an image generation method for generating an output image for display using a cut-out image cut out from a wide-angle picked-up image picked up by a camera.
- JP 2006-20141 JP 2008-33607 A JP 2006-301034 A
- An object of the present invention is to suppress a sudden change in the direction of an imaging target in a displayed cut-out image.
- This image generation apparatus is an image generation apparatus that generates a cut-out image from a captured wide-angle image, and stores a reference angle determination unit that obtains a reference angle of a cut-out area in the captured wide-angle image and a rotation angle of the previous cut-out image
- a rotation angle storage unit, a rotation angle calculation unit for obtaining a rotation angle for the cutout region based on the previous rotation angle and the reference angle, and a cutout image for the cutout region is generated based on the rotation angle obtained by the rotation angle calculation unit.
- An image cutout unit that controls the rotation angle calculation unit so that the amount of change in the rotation angle of the cutout region does not exceed a predetermined angle.
- FIG. 1 is a block diagram of an image processing system according to a first embodiment of the present invention.
- FIG. 2 is an explanatory diagram of display image generation processing according to the first embodiment of the present invention.
- FIG. 3 is an operation flowchart of the display image generation unit in the first embodiment of the present invention.
- FIG. 4 is a block diagram of an image processing system according to the second embodiment of the present invention.
- FIG. 5 is an explanatory diagram of region determination according to the second embodiment of the present invention.
- FIG. 6 is an operation flowchart of the display image generation unit in the second embodiment of the present invention.
- FIG. 7 is an explanatory diagram of a cutout region in an image captured with a fisheye lens.
- the camera device of the present invention uses an imaging unit that generates a shooting area image that is an image of the shooting area taken from above, and a shooting target that moves within the imaging area using a cut-out image cut out from the shooting area image.
- a display image generation unit that generates the display image, and the display image generation unit calculates a rotation angle for rotating the cut-out image when generating the display image, and the rotation angle.
- An image cutout unit that rotates the cutout image to generate the display image, a rotation angle storage unit that stores a rotation angle used to rotate the cutout image, and the shooting target in the shooting area image
- a reference angle determination unit that determines a reference angle that is an angle corresponding to the inclination of the rotation angle, and the rotation angle calculation unit calculates the rotation angle of the previous frame stored in the rotation angle storage unit and the previous angle. Based on the reference angle of the current frame determined by the reference angle determination unit has a configuration to calculate the rotation angle of the current frame.
- the display image generation unit is a position corresponding to the shooting target in the shooting area image, and is a position serving as a reference when the cut image is cut out from the shooting area image.
- a reference position determination unit that determines a cutout reference position; and a distance calculation unit that calculates a distance between the shooting reference position that is a position corresponding to the imaging unit in the shooting area image and the cutout reference position.
- the image cutout unit is configured to generate the display image by rotating the cutout image based on the rotation angle when the distance is equal to or less than a predetermined threshold distance.
- the system of the present invention uses a camera device that generates a shooting area image, which is an image of a shooting area taken from above, and a cut-out image cut out from the shooting area image to capture a shooting target that moves within the shooting area.
- An image processing system comprising: an image processing apparatus that generates a display image, wherein the image processing apparatus calculates a rotation angle for rotating the cut-out image when generating the display image; An image cutout unit that rotates the cutout image to generate the display image based on the rotation angle, a rotation angle storage unit that stores a rotation angle used to rotate the cutout image, and the shooting area image
- a reference angle determination unit that determines a reference angle that is an angle corresponding to the inclination of the subject to be imaged, and the rotation angle calculation unit is a rotation angle storage unit of the image processing device Based on the reference angle of the current frame determined as the rotation angle of the stored previous frame by the reference angle determination unit has a configuration to calculate the rotation angle of the current frame.
- the rotation angle of the current frame is calculated based on the rotation angle of the previous frame and the reference angle of the current frame, and the cut-out image is rotated and displayed based on the rotation angle. Since the image is generated, it is possible to suppress a sudden change in the direction of the shooting target displayed in the display image.
- the method of the present invention is an image processing method for generating a display image of a subject to be photographed that moves within the imaging area, using a cut-out image cut out from a photographing area image that is an image obtained by photographing the photographing area from above.
- a reference angle that is an angle corresponding to the inclination of the shooting target in the shooting area image
- a rotation angle of the previous frame of the cutout image is determined.
- the rotation angle of the current frame is calculated based on the reference angle of the current frame, and the display image is generated by rotating the cut image based on the calculated rotation angle.
- the rotation angle of the current frame is calculated based on the rotation angle of the previous frame and the reference angle of the current frame, and the clipped image is rotated and displayed based on the rotation angle. Since the image is generated, it is possible to suppress a sudden change in the direction of the shooting target displayed in the display image.
- the present invention it is possible to suppress a sudden change in the direction of the photographing target displayed in the display image, and to reduce the uncomfortable appearance due to the rotation of the display image.
- an imaging unit having a camera function is installed as a monitoring camera in an office, a store, a station, or the like, and a shooting area is captured as a moving image.
- FIG. 1 is a block diagram illustrating a configuration of an image processing system according to the first embodiment.
- the image processing system 1 includes an imaging unit 2 that captures an imaging area, and a display image generation unit that generates a display image by performing predetermined image processing (described later) on a captured image captured by the imaging unit 2. 3 and a display unit 4 for displaying the display image generated by the display image generation unit 3.
- the imaging unit 2, the display image generation unit 3, and the display unit 4 may be configured as a single device or may be configured as separate devices.
- the imaging unit 2 and the display image generation unit 3 may be configured as one camera device, and the display unit 4 may be realized by a display terminal connected to the camera device via an IP network. Further, the imaging unit 2 may be configured as a camera device, and the display image generation unit 3 and the display unit 4 may be realized by a personal computer or a tablet terminal connected to the camera device via an IP network.
- an image pickup unit 2 constitutes an image input device, and is arranged on at least an image pickup element (not shown) such as a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS) and an optical axis of the image pickup element.
- Lens (not shown).
- a lens having a wider angle of view than a standard lens for example, a fisheye lens, a quasi-wide angle lens, a wide angle lens, a super wide angle lens, etc.
- the imaging unit 2 is installed on the ceiling or the like of the imaging area so that the direction of the optical axis is in the vertical direction in order to efficiently capture a wide imaging area.
- the imaging unit 2 generates an image obtained by photographing the photographing area from above (an image photographed at an angle of view as if looking down from the ceiling).
- the imaging unit 2 may be installed on a floor, a desk, or the like and may be photographed from below.
- the display image generation unit 3 generates a cut-out image for display including a shooting target such as a person moving in the imaging area from the wide-angle captured image captured by the imaging unit 2 (see FIG. 2).
- the display image generation unit 3 includes an object detection unit 5, a reference position determination unit 6, a reference angle determination unit 7, a rotation angle calculation unit 8, a rotation angle storage unit 9, and an image cutout unit 10. The configuration of each part will be described below.
- the object detection unit 5 performs image processing on the captured image picked up by the image pickup unit 2 to detect a shooting target such as a person or a car included in the shooting area image.
- a shooting target such as a person or a car included in the shooting area image.
- a subject to be photographed can be detected from a photographed image by performing motion difference processing, background difference processing, or the like on the captured image.
- the imaging target is not limited to being specified by image processing, but may be determined through an operation for specifying the imaging target by the user.
- the reference position determination unit 6 determines a position (cutout reference position) that serves as a reference for the cutout region including the imaging target in the captured image.
- the position of the center of gravity of the detected image area to be imaged is determined as the extraction reference position. It can be said that this cut-out reference position is a position corresponding to a shooting target in the captured image. If the imaging target is a moving body, the extraction reference position moves with time according to the movement of the imaging target.
- the determination of the cutout reference position is not limited to this, and the center position of a frame surrounding the detected shooting target (for example, a rectangular frame circumscribing the shooting target) may be determined as the cutting reference position. Good or other methods may be used.
- the rotation angle calculation unit 8 calculates a rotation angle ⁇ new, t for rotating the cutout region when generating a display image from the captured image.
- the rotation angle ⁇ new, t of the current (time t) frame is based on the rotation angle ⁇ new, t-1 of the previous (time t-1) frame and the reference angle ⁇ t of the current (time t) frame (expression Calculate using 1).
- ⁇ new, t ⁇ new, t-1 + max (min ( ⁇ t- ⁇ new, t-1, ⁇ ), - ⁇ ) (Equation 1)
- ⁇ new, t a rotation angle used when the cutout region is rotated at time t
- ⁇ new, t-1 a rotation angle used for the cutout image at time t-1
- ⁇ t is a reference angle obtained by the reference angle determination unit 7 at time t.
- ⁇ is a predetermined threshold value (threshold angle). The initial value of ⁇ new, t may be set to 0 degrees.
- the amount of increase / decrease ( ⁇ t- ⁇ new, t-1) of this time (time t) is added to the rotation angle ⁇ new, t-1 of the previous time (time t-1), and the rotation amount of this time (time t)
- the threshold angle ⁇ with respect to the rotation change amount ( ⁇ t ⁇ new, t-1) from the previous rotation angle ⁇ new, t-1 Is set.
- the rotation change amount ( ⁇ t ⁇ new, t ⁇ 1) does not exceed the threshold value ⁇
- the rotation change amount ( ⁇ t ⁇ new, t ⁇ 1) is used, which is the rotation change amount ( ⁇ t ⁇ new, t ⁇ 1).
- the threshold angle ⁇ can be set to an arbitrary angle by the user.
- the threshold angle ⁇ may be a fixed value or a variable value. In the case of a fixed value, it is preferable to set an angle such that the cut image does not rotate extremely greatly from the previous direction, such as 45 °.
- the threshold angle ⁇ is varied according to the distance r between the photographing reference position O and the cutout reference position P.
- the variation value may be varied according to the difference ( ⁇ t ⁇ new, t ⁇ 1) between the reference angle ⁇ t and the rotation angle ⁇ new, t ⁇ 1 of the previous frame.
- the threshold angle ⁇ is varied according to a monotonically increasing function (such as Equation 3 below) that minimizes the threshold angle ⁇ . You may let them.
- the rotation angle storage unit 9 stores the rotation angles ⁇ new, t ⁇ 1 used for the rotation of the cutout image in the previous frame (time t ⁇ 1).
- the image cutout unit 10 generates a display image from the captured image. Specifically, a cut-out image is cut out from the captured image based on the cut-out reference position determined by the reference position determination unit 6.
- the image cutout unit 10 corrects distortion caused by the optical characteristics of the lens used in the imaging unit 2. Further, the image cutout unit 10 rotates the cutout region based on the rotation angle ⁇ new, t calculated by the rotation angle calculation unit 8.
- the display image generation unit 3 can be realized using a processor that executes a program for each process and a memory that stores information.
- the display image generation unit 3 firstly determines the reference position determination unit 6 based on the imaging target information detected by the target detection unit 5. To determine a reference position (cutout reference position) for cutting out the cutout area (step 1). Next, the reference angle ⁇ t is determined by the reference angle determination unit 7 according to where the cutout reference position is located in the captured image (step 2). The rotation angle calculation unit 9 determines whether or not the rotation angle ⁇ new, t ⁇ 1 with respect to the previous frame is stored in the rotation angle storage unit 9 (step 3), and the rotation angles ⁇ new, t ⁇ 1 are stored. Then, the rotation angle ⁇ new, t ⁇ 1 is read (step 4).
- the rotation angle ⁇ new, t with respect to the current frame is calculated based on the above-described equation 1 (step 5).
- the rotation angle calculation unit 9 stores or updates the rotation angle ⁇ new, t in the rotation angle storage unit 9 (step 6), and the image cutout unit 10 rotates the cutout region using the rotation angle ⁇ new, t.
- a cut image is obtained (step 7).
- the cut image is output to the display unit 4 (step 8).
- the rotation angle can be suppressed when the cutout region in the captured image is rotated, so that the image displayed on the display unit 4 is captured. It is possible to suppress a sudden change in the direction of the object.
- FIG. 4 is a block diagram showing the configuration of the image processing system of the second embodiment
- FIG. 5 is an explanatory diagram of region determination in the second embodiment of the present invention.
- the display image generation unit 3 of the image processing system 1 in this embodiment includes a distance calculation unit 11 and an area determination unit 12 in addition to the configuration shown in the first embodiment.
- the distance calculation unit 11 is between the position O (imaging reference position) corresponding to the imaging unit 2 in the captured image and the cut-out reference position P determined by the reference position determination unit 6.
- the distance r is calculated.
- the imaging unit 2 includes a fisheye lens
- the captured image is a circle as shown in FIG.
- the photographing reference position O is the center of the captured image (fisheye image). Therefore, the distance calculation unit 11 calculates the distance r between the extraction reference position P determined by the reference position determination unit 6 and the photographing reference position O.
- the distance r may be calculated by the number of pixels in the shooting area image, or may be calculated by a value (meter or the like) converted into an actual distance.
- the area determination unit 12 determines whether or not the shooting target included in the captured image is within a predetermined specific area (for example, a circular area having a radius a centered on the shooting reference position O). Specifically, the region determination unit 12 determines whether the distance r calculated by the distance calculation unit 11 is equal to or less than the radius a.
- This radius a can be appropriately set by the user. The radius a is set to 10 m, for example. This specific area can be set over the entire photographing area. In that case, the radius a is set to infinity.
- the rotation angle calculation unit 8 calculates a rotation angle for rotating the cutout area when generating a display image from the captured image. In this case, as described below, the rotation angle when the shooting target is outside the specific area and the rotation angle when the shooting target is within the specific area are calculated by different methods.
- the rotation angle calculation unit 8 determines the reference angle ⁇ t as the rotation angle, and the image cutout unit 10 rotates the cutout region based on the rotation angle ⁇ t so that there is no inclination. A display image is obtained.
- the rotation angle calculation unit 8 obtains the rotation angles ⁇ new and ⁇ t using the method shown in the first embodiment.
- the image cutout unit 10 can suppress a sudden change in the orientation of the shooting target displayed in the display image by rotating the cutout region based on the rotation angles ⁇ new and t.
- a position P (cutout reference position) serving as a reference for cutting out the cutout image is determined (step 21), and the cutout reference is determined.
- the reference angle ⁇ t is determined according to where the position P is located in the captured image (step 22).
- the distance calculation unit 11 calculates the shooting reference position O, the extraction reference position P, and the distance r (step 23), and the area determination unit 12 determines whether or not the shooting target included in the captured image is within a specific area. It is determined whether or not r ⁇ a (step 24).
- step 26 If it is determined that the area is within the specific area, the processing from step 26 to step 29 is performed as in the first embodiment.
- the rotation angle calculation method of the cutout area is changed according to the area of the picked-up image, so that the direction of the image pickup target is also prevented from suddenly changing greatly while reducing the load of the image cutout process. be able to.
- the camera device has an effect that it is possible to suppress a sudden change in the direction of the shooting target displayed in the display image, and a predetermined shooting area (in a store or a station). This is useful for a system that monitors a premises).
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Abstract
Description
本発明の第1の実施の形態の画像処理システムの構成を、図面を参照して説明する。
図1は、第1の実施の形態の画像処理システムの構成を示すブロック図である。
図1に示すように、画像処理システム1は、撮影エリアを撮像する撮像部2と、撮像部2で撮影した撮像画像に後述する所定の画像処理を施して表示画像を生成する表示画像生成部3と、表示画像生成部3で生成された表示画像を表示する表示部4を備えている。
なお、撮像部2、表示画像生成部3、表示部4は一つの装置として構成されても良いし、別々の装置として構成されても良い。また、撮像部2と表示画像生成部3が一つのカメラ装置として構成され、表示部4はカメラ装置とIPネットワークを介して接続された表示端末で実現されても良い。また、撮像部2がカメラ装置として構成され、表示画像生成部3と表示部4がカメラ装置とIPネットワークを介して接続されたパーソナル・コンピュータやタブレット端末等で実現されても良い。
撮像部2のレンズは、一つのカメラでより広い領域を撮影エリアとしてカバーするため標準レンズより広い画角を有するレンズ(例えば、魚眼レンズ、準広角レンズ、広角レンズ、超広角レンズなど)が用いられる。そして、撮像部2は、広い撮像エリアを効率的に撮像するために、撮影エリアの天井等に光軸の向きが上下方向となるように設置される。したがって、撮像部2は、撮影エリアを上方から撮影した画像(天井から見下ろすような画角で撮影した画像)を生成する。なお、撮像部2は床や机上等に設置され、下方から撮影するようにしても構わない。
この切出し基準位置は、撮像画像において撮影対象に対応する位置であるともいえる。撮像対象が移動体であれば、撮像対象の移動に応じて切出し基準位置が時間と共に移動することになる。なお、切出し基準位置の決定についてはこれに限定されるものではなく、検出された撮影対象を囲むフレーム(例えば、撮影対象に外接する矩形フレーム)の中心の位置を切出し基準位置として決定しても良いし、その他の手法を用いても良い。
θnew, t=θnew, t-1+max(min(θt-θnew, t-1,α),-α)(式1)
ここで、θnew, tは時刻tにおいて切り出し領域を回転処理する際に用いる回転角、θnew, t-1は時刻t-1における切出し画像に用いられた回転角である。θtは時刻tにおいて基準角決定部7により得られた基準角である。なお、αは、所定のしきい値(しきい角度)である。また、θnew, tの初期値は0度に設定されてよい。
しきい角度αは、ユーザが任意の角度を設定することができる。しきい角度αは固定値でも良いし、変動値でも良い。固定値の場合は例えば45°など、切出し画像が前回の向きから極端に大きく回転しない程度の角度を設定するのが好ましい。また、変動値の場合は、しきい角度αを撮影基準位置Oと切出し基準位置Pとの間の距離rに応じて変動させることが考えられる。例えば、距離r=0のときにしきい角度αが最小となる単調増加の関数(下記の式2など)に従って、しきい角度αを変動させてもよい。なお、下記の式2において、A、Bは、任意の正の定数である。
α=A+B×r (式2)
α=C+D×|θt-θnew, t-1| (式3)
画像切出し部10は、撮像画像から表示画像を生成する。具体的には、基準位置決定部6で決定された切出し基準位置に基づいて、撮像画像から切出し画像を切出す。また、この画像切出し部10は、撮像部2において使用されるレンズの光学特性に起因する歪みを補正する。さらに、この画像切出し部10は、回転角算出部8で算出された回転角θnew, tに基づいて、切出し領域を回転させる。
なお、表示画像生成部3は各部は、各処理用のプログラムを実行するプロセッサや情報を記憶するメモリを使って実現可能である。
次に、基準角決定部7により切出し基準位置が撮像画像のどこに位置するかに応じて基準角θtを決定する(ステップ2)。
回転角算出部9は、前回のフレームに対する回転角θnew, t-1が回転角記憶部9に記憶されているか否かを判断し(ステップ3)、回転角θnew, t-1が記憶されていれば回転角θnew, t-1を読み出す(ステップ4)。そして、前回フレームに対する回転角θnew, t-1と現在のフレームに対する基準角θtとを用いて、前述の式1に基づき現在のフレームに対する回転角θnew, tを算出する(ステップ5)。
そして、回転角算出部9は回転角θnew, tを回転角記憶部9に記憶、あるいは更新するとともに(ステップ6)、画像切出し部10は回転角θnew, tを用いて切出し領域を回転させて切出し画像を得る(ステップ7)。切出し画像は表示部4に出力される(ステップ8)。
次に、本発明の第2の実施の形態の画像処理システムについて説明する。
本実施の形態では、第1の実施の形態と相違する点を中心に説明する。ここで特に言及しない限り、本実施の形態の構成および動作は、第1の実施の形態と同様である。
撮像部2が魚眼レンズを備えている場合、撮像画像は図5に示されるように円となる。撮影基準位置Oは、撮像画像(魚眼画像)の中心となる。したがって、距離算出部11は、基準位置決定部6で決定された切出し基準位置Pと撮影基準位置Oとの間の距離rを算出する。この距離rは、撮影エリア画像におけるピクセル数で算出されてもよく、実際の距離に換算した値(メートルなど)で算出されてもよい。
次いで、距離算出部11は、撮影基準位置Oと切出し基準位置Pと距離rを算出し(ステップ23)、領域判定部12は撮像画像に含まれる撮影対象が、特定領域内であるか否か(r≦aであるか否か)の判定を行う(ステップ24)。
一方、ステップ24において、領域判定部12で特定領域内でないと判定された場合には、回転角算出部8は基準角θtを回転角とし(θnew, t =
θt)、当該回転角を記憶10に記憶する(ステップ28)。
2 撮像部
3 表示画像生成部
4 表示部
5 対象検出部
6 基準位置決定部
7 基準角決定部
8 回転角算出部
9 回転角記憶部
10 画像切出し部
11 距離算出部
12 領域判定部
100 画像処理システム
110 カメラ装置
120 画像処理装置
130 表示装置
Claims (13)
- 撮像した広角画像から切出し画像を生成する画像生成装置であって、
撮像した広角画像における切出し領域の基準角を求める基準角決定部と、
前回の切出し画像の回転角を記憶する回転角記憶部と、
前記前回の回転角と前記基準角とに基づいて前記切出し領域に対する回転角を求める回転角算出部と、
前記回転角算出部で求めた回転角に基づき、前記切出し領域に対する切出し画像を生成する画像切出し部と、を備え、
前記回転角算出部は、前記切出し領域の回転角の変化量が所定の角度を超えないように制御する画像生成装置。 - 前記切出し領域の回転角の変化量は、前記前回の回転角と基準角との差分である請求項1に記載の画像生成装置。
- 前記回転角算出部は、前記切出し領域の回転角の変化量が前記所定の角度を超える場合、前記前記所定の角度を前記切出し領域の回転角の変化量とする請求項1に記載の画像生成装置。
- 撮像された広角画像における切出し領域の基準位置を決定する基準位置決定部を備える請求項1に記載の画像生成装置。
- 撮像された広角画像に含まれる撮像対象を検出する撮像対象検出部を備え、前記基準位置決定部は、前記撮像対象に基づいて前記切出し領域の基準位置を決定する請求項4記載の画像生成装置。
- 撮像された広角画像は魚眼レンズを用いて撮像されたものである請求項1記載の画像生成装置。
- 撮像された広角画像は上方から撮像されたものである請求項1記載の画像生成装置。
- 前記切出し領域が、撮像された広角画像の所定の領域に存在する場合に、前記画像切出し部は、前記切出し領域の回転角の変化量が所定の角度を超えないように制御する請求項1記載の画像生成装置。
- 前記所定の領域は、撮像された広角画像の撮影基準位置を基準として決定されるものである請求項8記載の画像生成装置。
- 撮像された広角画像における前記切出し領域の基準位置を決定する基準位置決定部と、前記基準位置と前記広角画像の撮影基準位置との距離に基づいて前記切出し領域が前記所定の領域内に含まれるか否かを判定する領域判定部とを備える請求項9記載の画像生成装置。
- 撮像した広角画像から切出し画像を生成するカメラ装置であって、
広角画像を撮像する撮像部と、
前記撮像部により撮像された広角画像における切出し領域の基準角を求める基準角決定部と、
前回の切出し画像の回転角を記憶する回転角記憶部と、
前記前回の回転角と前記基準角とに基づいて前記切出し領域に対する回転角を求める回転角算出部と、
前記回転角算出部で求めた回転角に基づき、前記切出し領域に対する切出し画像を生成する画像切出し部と、を備え、
前記回転角算出部は、前記切出し領域の回転角の変化量が所定の角度を超えないように制御するカメラ装置。 - 撮像した広角画像から切出し画像を生成する画像表示装置であって、
撮像した広角画像における切出し領域の基準角を求める基準角決定部と、
前回の切出し画像の回転角を記憶する回転角記憶部と、
前記前回の回転角と前記基準角とに基づいて前記切出し領域に対する回転角を求める回転角算出部と、
前記回転角算出部で求めた回転角に基づき、前記切出し領域に対する切出し画像を生成する画像切出し部と、
前記切出し画像を表示する表示部と、を備え、
前記回転角算出部は、前記切出し領域の回転角の変化量が所定の角度を超えないように制御する画像表示装置。 - 撮像した広角画像から切出し画像を生成する画像生成方法であって、
撮像された広角画像における切出し領域の基準角を求めるステップと、
記憶していた前回の切出し画像の回転角と前記基準角とに基づいて切出し画像の回転角を求めるステップと、
前記ステップで求めた回転角に基づき、前記切出し領域に対する切出し画像を生成するステップと、を備え、
切出し領域の回転角を求める際、切出し画像の回転角の変化量が所定の角度(α)を超えないように制御する画像生成方法。
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