WO2011129174A1 - 映像処理装置および映像処理方法 - Google Patents
映像処理装置および映像処理方法 Download PDFInfo
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- WO2011129174A1 WO2011129174A1 PCT/JP2011/056339 JP2011056339W WO2011129174A1 WO 2011129174 A1 WO2011129174 A1 WO 2011129174A1 JP 2011056339 W JP2011056339 W JP 2011056339W WO 2011129174 A1 WO2011129174 A1 WO 2011129174A1
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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
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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
Definitions
- the present invention relates to an image processing apparatus and an image processing method for masking a partial area of an image.
- a technique in which a shot image is divided into blocks, a mask area is set by designating whether or not to perform masking in block units, and masking processing is performed on the image in the mask area.
- the shape of the mask area is limited to a combination of rectangles. For this reason, it is difficult to accurately trace an image of an object to be protected, and the protected object may not be masked sufficiently.
- Patent Document 1 proposes an imaging apparatus that stores a plurality of types of mask patterns having a shape such as a triangle and a quadrangle in a memory in advance, and combines these mask patterns as necessary to superimpose on a captured image for masking. Has been. As a result, areas of various shapes can be masked.
- Patent Document 1 requires as many frame memories for storing mask patterns as the number of types of mask patterns, resulting in an increase in apparatus configuration.
- the mask pattern can be enlarged, reduced, and rotated, but since the mask pattern stored in advance in the memory is the base, even if a plurality of mask patterns are stored, The degree of freedom of shape setting was limited.
- the present invention has been made in view of the above, and provides a video processing apparatus and a video processing method capable of improving the degree of freedom of shape setting of a region to be masked in an image while suppressing an increase in the apparatus configuration. Objective.
- a video processing apparatus includes a video acquisition unit that acquires a video signal and a synchronization signal thereof, and a 3 on a display screen that displays a video based on the video signal in response to a user operation.
- a designation unit that designates at least two points; a definition unit that defines each straight line that forms each side of a polygon whose apexes are the points designated by the designation unit; and the video based on the synchronization signal
- a coordinate designating unit for designating horizontal and vertical coordinates of each pixel on the display screen in the signal, and a coordinate value in one direction which is the horizontal or vertical direction of each pixel designated by the coordinate designating unit.
- a coordinate calculation unit that calculates a corresponding coordinate value in the other direction that is different from the one direction on each straight line, and a coordinate value in the other direction of each pixel specified by the coordinate specification unit And before By comparing the coordinate value in the other direction on each straight line calculated by the coordinate calculation unit, each pixel in the video signal is a mask area that is an area within the polygon surrounded by each straight line And a masking unit for masking each pixel included in the mask region with a mask image.
- the video processing method of the present invention acquires a video signal and its synchronization signal, and based on the synchronization signal, coordinates in the horizontal direction and the vertical direction on the display screen of each pixel in the video signal are coordinate designation units.
- a video processing method in a video processing apparatus for displaying video based on the video signal on the display screen by designating at least three points on the display screen according to a user operation Corresponding to the coordinate value of one direction which is the horizontal direction or the vertical direction of each pixel specified by the coordinate specification unit Calculating the coordinate value of the other direction that is different from the one direction on each straight line, the coordinate value of the other direction of each pixel specified by the coordinate specifying unit, and the calculation By comparing the coordinate value of the other direction on the straight line calculated in the step of performing each pixel in the video signal into a mask region that is a region within the polygon surrounded by the straight line.
- the video processing apparatus and the video processing method of the present invention it is possible to improve the degree of freedom in setting the shape of the area to be masked in the video while suppressing an increase in the apparatus configuration.
- FIG. 1 is a block diagram showing a configuration of a video processing apparatus according to an embodiment of the present invention.
- FIG. 2 is a diagram illustrating regions separated by a straight line.
- FIG. 3 is a diagram illustrating a region surrounded by four straight lines.
- FIG. 4 is a diagram showing a straight line passing through two points.
- FIG. 5 is a configuration diagram of a mask information generation unit in the video processing apparatus shown in FIG.
- FIG. 6 is a configuration diagram of the offset calculation unit in the mask information generation unit shown in FIG.
- FIG. 7 is an explanatory diagram of block coordinates.
- FIG. 8 is a configuration diagram of a coordinate calculation unit in the mask information generation unit shown in FIG.
- FIG. 9 is an explanatory diagram of a comparator in the mask information generation unit shown in FIG.
- FIG. 10 is an explanatory diagram of a coordinate calculation result by the coordinate calculation unit shown in FIG.
- FIG. 11 is an explanatory diagram of an example of a user interface for setting a
- FIG. 1 is a block diagram showing a configuration of a video processing apparatus according to an embodiment of the present invention.
- the video processing apparatus 1 includes a video acquisition unit 2, an operation input unit 3, a mask information generation unit 4, a masking unit 5, and a monitor 6.
- the video acquisition unit 2 has an imaging function and outputs a video signal composed of a luminance signal and a color difference signal obtained by photographing a subject and a synchronization signal thereof.
- the synchronization signal includes a horizontal synchronization signal, a vertical synchronization signal, and a clock signal. Note that the video acquisition unit 2 may acquire a video signal captured by an imaging device and a synchronization signal thereof from the outside.
- the operation input unit 3 receives a user operation and outputs an operation signal corresponding to the operation.
- the user operates the operation input unit 3 to specify the points (three or more) that are the vertices of the area to be masked on the display screen of the monitor 6 on which the video is displayed.
- Mask areas surrounded by the same number of lines (three or more) as the number of points can be set.
- the operation input unit 3 functions as a designating unit that designates each point (pixel position) serving as a vertex of the mask area in response to a user operation, and outputs mask position information indicating the coordinates of each point.
- the mask information generation unit 4 determines whether each pixel in the video signal is included in a mask area that is an area within a polygon having each point designated by a user operation as a vertex, and indicates the mask Output information.
- the masking unit 5 performs a process of masking each pixel included in the mask area in the video signal with a mask image based on the mask information input from the mask information generating unit 4.
- the monitor 6 is composed of a liquid crystal display or the like, and displays an image whose mask area is masked by the masking unit 5 on the display screen.
- the mask information generation unit 4 defines the four straight lines that form each side of the quadrangle having the designated four points as vertices (Formula 7). Whether or not each pixel in the video signal is included in a quadrangle serving as a mask area based on the inequalities such as (Equation 3) to (Equation 6) corresponding to the defined straight lines. And mask information indicating the result is output.
- FIG. 5 shows the configuration of the mask information generation unit 4 that performs such processing.
- the mask information generating unit 4 includes an offset calculating unit 41, a counter (coordinate specifying unit) 42, coordinate calculating units 43A to 43D, comparators 44A to 44D, and an AND circuit 45.
- FIG. 5 shows a configuration example in the case where an area within a quadrangle surrounded by four straight lines is used as a mask area. Four coordinate calculation units and four comparators are provided corresponding to the number of straight lines. Yes.
- the offset calculating unit 41 calculates the inclinations and offsets of the four straight lines that form each side of the quadrangle having the four points as vertices. calculate.
- the offset calculation unit 41 corresponds to the definition unit of the present invention.
- the offset calculation unit 41 includes a block position conversion unit 411, a subtraction circuit 412, a table 413, multiplication circuits 414 and 415, an addition circuit 416, and a D-FF (D type flip-flop). 417, 418.
- a block position conversion unit 411 the offset calculation unit 41 includes a block position conversion unit 411, a subtraction circuit 412, a table 413, multiplication circuits 414 and 415, an addition circuit 416, and a D-FF (D type flip-flop). 417, 418.
- D-FF D type flip-flop
- the block position conversion unit 411 converts the coordinates of the point designated as the vertex of the mask area into coarse block coordinates as shown in FIG. For example, as shown in FIG. 7, the block position conversion unit 411 divides the image space into 16 pixel blocks (16 ⁇ 16 pixels) in the horizontal direction (x direction in the drawing) and the vertical direction (y direction in the drawing). The coordinates of the pixel inside are converted into the block coordinates of the upper left point in the figure of the block. For example, the coordinates of each pixel included in the block 10 of FIG. 7 are converted into the block coordinates (4, 1).
- the subtraction circuit 412 calculates ⁇ and ⁇ in (Expression 7) based on the coordinates converted by the block position conversion unit 411.
- the coordinates of the two points (x 0 , y 0 ) and (x 1 , y 1 ) are converted into (x 0 ′, y 0 ′) and (x 1 ′, y 1 ′) by the block position conversion unit 411, respectively.
- the table 413 holds the value of ⁇ and the value of 1 / ⁇ in correspondence with each other, and when the value of ⁇ is input from the subtraction circuit 412, the value of 1 / ⁇ corresponding thereto is output.
- an increase in circuit scale can be suppressed by obtaining the value of 1 / ⁇ by table lookup instead of division. Further, by obtaining the 1 / ⁇ value from the ⁇ value calculated based on the coarse block coordinates converted by the block position converting unit 411, the pattern of the ⁇ value can be reduced, and The size can be reduced and an increase in circuit scale can be suppressed.
- the size of the block is set to such a size that the influence on the shape of the mask region can be ignored.
- the multiplication circuit 414 multiplies 1 / ⁇ input from the table 413 and ⁇ input from the subtraction circuit 412 to calculate the inclination ⁇ / ⁇ .
- the multiplication circuit 415 multiplies the slope ⁇ / ⁇ calculated by the multiplication circuit 414 by x 0 and inverts the sign to calculate ⁇ ( ⁇ / ⁇ ) x 0 .
- the adder circuit 416 adds y 0 to ⁇ ( ⁇ / ⁇ ) x 0 calculated by the multiplier circuit 415 to calculate an offset ⁇ ( ⁇ / ⁇ ) x 0 + y 0 ⁇ .
- Each of the D-FFs 417 and 418 holds the offset ⁇ ( ⁇ / ⁇ ) x 0 + y 0 ⁇ calculated by the adding circuit 416 and the gradient ⁇ / ⁇ calculated by the multiplying circuit 414, and the coordinate calculating units 43A to 43A- Output to one of 43D.
- the offset calculation unit 41 calculates the inclinations and offsets of the four straight lines, respectively, and outputs them to the coordinate calculation units 43A to 43D corresponding to the respective straight lines.
- the counter 42 designates the position (coordinates) on the display screen of each pixel in the video signal based on the synchronization signal (horizontal synchronization signal, vertical synchronization signal, clock signal) supplied from the video acquisition unit 2.
- the position information is output to the comparators 44A to 44D.
- the coordinate calculation units 43A to 43D perform an operation corresponding to the right side of (Expression 7) based on the slope and offset of each straight line input from the offset calculation unit 41.
- the configuration of the coordinate calculation unit 43A is shown in FIG.
- the configuration of the coordinate calculation units 43B to 43D is the same.
- the coordinate calculation unit 43A includes addition circuits 431 and 432 and a D-FF 433.
- ( ⁇ / ⁇ ) x that is a variable portion that changes in accordance with the x coordinate of the image space, and an offset ⁇ ( ⁇ / ⁇ ) x 0 + y 0 ⁇ that is a fixed value. It is divided into.
- the variable circuit ( ⁇ / ⁇ ) x is calculated by the addition circuit 431 and the D-FF 433.
- the D-FF 433 receives a horizontal synchronization signal indicating an effective range in the horizontal direction (x direction) of the display screen and a clock signal for rendering each pixel.
- the D-FF 433 captures and holds the calculation result of the adder circuit 431 every clock cycle, and outputs the calculation result of the adder circuit 431 captured in the previous clock cycle to the adder circuit 431.
- the value held by the D-FF 433 is reset to 0 at the rising edge of the horizontal synchronization signal.
- the addition circuit 431 adds the gradient ⁇ / ⁇ to the input value from the D-FF 433 and outputs the calculation result.
- variable portion ( ⁇ / ⁇ ) x on the right side of (Expression 7) is calculated by accumulating the slope ⁇ / ⁇ every clock using the adder circuit 431 and the D-FF 433.
- the addition circuit 432 adds the offset value input from the offset calculation unit 41 to the calculation result of the addition circuit 431.
- the calculation result (coordinate calculation result) of the addition circuit 432 is a value corresponding to the right side of (Expression 7).
- the comparators 44A to 44D determine whether or not the inequalities such as (Expression 3) to (Expression 6) corresponding to the corresponding straight lines are satisfied.
- the comparator 44A includes the coordinate calculation result input from the coordinate calculation unit 43A as shown in FIG. Based on the position information input from the counter 42, it is determined whether or not the inequality of (Expression 3) is satisfied.
- the comparator 44A outputs a logic “1” as the determination result when the inequality is satisfied, and outputs a logic “0” when the inequality is not satisfied.
- the comparators 44B to 44D determine whether or not the inequalities of (Expression 4) to (Expression 6) are satisfied, and output a logic “1” or “0” as a determination result.
- the coordinate calculation result of the coordinate calculation unit 43A is a straight line L corresponding to the coordinate calculation unit 43A.
- the determination process of whether or not the inequality is satisfied in the comparator 44A is to determine whether q 0 is on the mask region side with respect to the straight line L 0 by comparing y 3 and y 4 . , Q 0 is on the mask area side, a logic “1” is output as the determination result.
- Coordinate calculation section 43B ⁇ 43D are the same for the treatment of comparators 44B ⁇ 44D, when inside the mask region q 0 is surrounded by the straight line, the output from the comparators 44A ⁇ 44D are all logic "1" Obviously.
- the AND circuit 45 indicates that the pixel position (coordinates) specified by the counter 42 is within the mask area as mask information. Output logic “1”, otherwise output logic “0”.
- the comparators 44A to 44D and the AND circuit 45 as described above constitute a determination unit that determines whether or not each pixel in the video signal is included in the mask area.
- the video processing device 1 displays the video based on the video signal acquired by the video acquisition unit 2 on the monitor 6 as it is.
- the user operates the operation input unit 3 while looking at the display screen of the monitor 6 and designates each point as the position of the vertex of the mask area. In the present embodiment, four points are designated.
- the offset calculation unit 41 of the mask information generation unit 4 performs the above-described block position conversion unit 411, subtraction circuit 412, table 413, multiplication circuits 414 and 415, and addition circuit.
- the inclination and offset of each of the four straight lines constituting each side of the quadrangle having four points as vertices are calculated, and the calculated inclination and offset values are calculated as coordinates corresponding to the respective straight lines. Output to the units 43A to 43D.
- the coordinate calculation units 43A to 43D cumulatively add the slopes ⁇ / ⁇ of the corresponding straight lines by the addition circuit 431 and the D-FF 433, so that the variable portion ( ⁇ / ⁇ ) x is calculated, and an offset value is added to this value by the adding circuit 432, and a coordinate calculation result indicating a value corresponding to the right side of (Expression 7) is output.
- the comparators 44A to 44D based on the coordinate calculation results input from the coordinate calculation units 43A to 43D and the position information input from the counter 42, correspond to the corresponding straight lines (Expression 3) to (Expression 3). It is determined whether the inequality such as 6) is satisfied.
- the comparators 44A to 44D output a logic “1” as the determination result when the inequality is satisfied, and output a logic “0” when the inequality is not satisfied.
- the AND circuit 45 outputs a logic “1” as mask information when the determination results input from the comparators 44A to 44D are all logic “1”, and outputs a logic “0” in other cases. .
- the masking unit 5 masks a pixel in which the mask information input from the mask information generation unit 4 is logical “1” in the video signal input from the video acquisition unit 2 with a mask image, and the mask information is logical “0”. For the pixels that are, the video signal is output as it is. As a result, an image in which the mask area is masked is displayed on the display screen of the monitor 6.
- the mask image can be an image in which the mask area is filled with a specific color or a mosaic image.
- the user can mask variously shaped areas. Can be set as an area.
- the mask information generation unit 4 that performs processing for defining straight lines constituting each side of the polygon that becomes the mask region, determination processing for the mask region, and the like, as shown in FIGS. 5, 6, 8, and 9, Since the circuit is composed of an addition circuit, a subtraction circuit, a multiplication circuit, etc., it can be realized with a small circuit scale. In addition, masking processing can be performed in real time.
- a user interface may be provided in which the user can select any of the above by operating the operation input unit 3 and move the vertex of the selected mask shape as necessary to specify the position of the vertex.
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Abstract
Description
yp>axp+b …(式2)
(式1)が満たされる場合は、点pは領域Aに位置し、(式2)が満たされる場合は、点pは領域Bに位置する。
y>a1x+b1 …(式4)
y<a2x+b2 …(式5)
y<a3x+b3 …(式6)
ところで、図4に示すxy座標上の点p0(x0,y0)、p1(x1,y1)の2点を通る直線Lは、y切片をzとして、以下のように表現できる。
これを、p0を原点とした直線に変形すると、
y-y0={(y1-y0)/(x1-x0)}(x-x0)
ここで、α=(y1-y0),β=(x1-x0)とすると、
y-y0=(α/β)(x-x0)
よって、
y=(α/β)x-(α/β)x0+y0 …(式7)
このように、p0(x0,y0)、p1(x1,y1)の2点を通る直線Lは、傾きα/β(α=(y1-y0),β=(x1-x0))、および、y切片に相当するオフセット(-(α/β)x0+y0)により定義される。オフセットは、直線を構成する2点の座標と傾きとが決まれば固定値となる。
2 映像取得部
3 操作入力部
4 マスク情報生成部
5 マスキング部
6 モニタ
41 オフセット算出部
42 カウンタ
43A~43D 座標算出部
44A~44D 比較器
45 AND回路
411 ブロック位置変換部
412 減算回路
413 テーブル
414,415 乗算回路
416,431,432 加算回路
417,418,433 D-FF
Claims (2)
- 映像信号とその同期信号とを取得する映像取得部と、
ユーザ操作に応じて、前記映像信号に基づく映像を表示する表示画面上における3つ以上の点を指定する指定部と、
前記指定部で指定された各点を頂点とする多角形の各辺を構成する各直線を定義する定義部と、
前記同期信号に基づいて、前記映像信号における各画素の前記表示画面上における水平方向および垂直方向の座標を指定する座標指定部と、
前記座標指定部により指定される各画素の水平方向または垂直方向である一方の方向の座標値に対応する、前記各直線上の前記一方の方向とは異なる方向である他方の方向の座標値を算出する座標算出部と、
前記座標指定部により指定される各画素の前記他方の方向の座標値と、前記座標算出部により算出された前記各直線上の前記他方の方向の座標値とを比較することにより、前記映像信号における各画素が、前記各直線で囲まれる前記多角形内の領域であるマスク領域に含まれるか否かを判定する判定部と、
前記マスク領域に含まれる各画素をマスク画像でマスキングするマスキング部と
を備えることを特徴とする映像処理装置。 - 映像信号とその同期信号とを取得し、前記同期信号に基づいて、前記映像信号における各画素の表示画面上における水平方向および垂直方向の座標を座標指定部により指定して、前記映像信号に基づく映像を前記表示画面に表示する映像処理装置における映像処理方法であって、
ユーザ操作に応じて、前記表示画面上における3つ以上の点を指定し、指定した各点を頂点とする多角形の各辺を構成する各直線を定義する工程と、
前記座標指定部により指定される各画素の水平方向または垂直方向である一方の方向の座標値に対応する、前記各直線上の前記一方の方向とは異なる方向である他方の方向の座標値を算出する工程と、
前記座標指定部により指定される各画素の前記他方の方向の座標値と、前記算出する工程で算出された前記各直線上の前記他方の方向の座標値とを比較することにより、前記映像信号における各画素が、前記各直線で囲まれる前記多角形内の領域であるマスク領域に含まれるか否かを判定する工程と、
前記マスク領域に含まれる各画素をマスク画像でマスキングする工程と
を含むことを特徴とする映像処理方法。
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EP11768695.6A EP2560365A4 (en) | 2010-04-14 | 2011-03-17 | Video image processing device and video image processing method |
KR1020127026449A KR101327252B1 (ko) | 2010-04-14 | 2011-03-17 | 영상 처리 장치 및 영상 처리 방법 |
CN201180018522.9A CN102986206B (zh) | 2010-04-14 | 2011-03-17 | 影像处理装置以及影像处理方法 |
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JP6539510B2 (ja) * | 2015-06-17 | 2019-07-03 | オリンパス株式会社 | 撮像装置、撮像装置の制御方法、および撮像装置の制御プログラム |
CN105208340B (zh) * | 2015-09-24 | 2019-10-18 | 浙江宇视科技有限公司 | 一种视频数据的显示方法和装置 |
KR102100582B1 (ko) * | 2019-02-01 | 2020-04-13 | 순천향대학교 산학협력단 | 영상보안시스템에서 형태보존암호 기술을 이용한 프라이버시 마스킹 방법 및 이를 수행하기 위한 기록 매체 |
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Also Published As
Publication number | Publication date |
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US20130027405A1 (en) | 2013-01-31 |
KR101327252B1 (ko) | 2013-11-08 |
JP5273087B2 (ja) | 2013-08-28 |
CN102986206B (zh) | 2015-10-14 |
EP2560365A4 (en) | 2017-07-26 |
JP2011223498A (ja) | 2011-11-04 |
KR20120137408A (ko) | 2012-12-20 |
EP2560365A1 (en) | 2013-02-20 |
CN102986206A (zh) | 2013-03-20 |
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