JP2004064309A - Device for special effect image - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for special effect images which freely changes a curvature of a spherical shape that results from deforming a video signal and displayed. <P>SOLUTION: An input image signal is stored temporarily into a memory and read from the memory according to a read address generated by a read address generating means. The read address generating means includes: a polar coordinate transformation means 22 for transforming an orthogonal coordinate system address into a polar coordinate system address wherein the center of an image subjected to a special effect is used for the origin; a modulation amount generating means 23 for generating a modulation amount of the polar coordinate system address; a modulation amount amplitude adjustment means 24 for adjusting the amplitude of the modulation amount; a correction means 26 for correcting a magnification factor of an image subjected to the special effect; orthogonal coordinate transformation means 27, 29, 30 for transforming the corrected polar coordinate system address into an orthogonal coordinate system address to generate the read address; and a discrimination means 28 for discriminating whether or not the read addresses falls within a range of the image subjected to the special image. Thus, the device for special effect image can deform a part of the input image to be like a sphere and freely change the curvature of the sphere. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image special effect device for giving a special effect to a video signal, and more particularly to a spherical special effect.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an image special effect device that deforms and displays a video signal temporarily stores an image signal of an original image in a frame memory, and sets a read address of the frame memory so that a predetermined deformed image can be obtained.
For example, Japanese Patent Application Laid-Open No. 5-328217 discloses an image special effect device for generating a bubble-like special effect image of an arbitrary size at an arbitrary position on a screen. This apparatus includes a frame memory for temporarily storing an image signal of an original image, a controller for designating an address of the frame memory, and an address conversion circuit for converting an address output from the controller with a function.
[0003]
An image signal of an input original image is sequentially written into the frame memory for each frame. The controller outputs a signal that specifies the address of the frame memory and the radius of the hemisphere of the bubble that generates the special effect image, and the address conversion circuit converts this address to the address corresponding to the hemisphere of the specified radius. Convert to The image signal at this address is sequentially read from the frame memory, and a bubble-shaped special effect image is displayed.
[0004]
[Problems to be solved by the invention]
However, such a conventional image special effect device has a problem that even when a special effect for deforming an image into a spherical shape is applied, an actual image looks flatter than a desired effect.
The present invention solves such a conventional problem, and provides an image special effect device capable of freely changing the curvature of a spherical shape to be deformed and displayed so that a spherical shape having a desired roundness can be obtained. It is intended to be.
[0005]
[Means for Solving the Problems]
Therefore, according to the present invention, the image signal input from the outside is temporarily stored in the memory buffer, and the image signal stored in the memory buffer is read out by the read address generated by the read address generation means, thereby storing the image signal in the memory buffer. In an image special effect device for applying a special effect to the image signal, the read address generation unit includes a rectangular coordinate conversion unit that converts a rectangular coordinate system address into a polar coordinate system address having the origin at the center of the image on which the special effect is to be performed. A modulation amount generating means for generating a modulation amount of a polar coordinate system address, a modulation amount amplitude adjusting means for adjusting the amplitude of the modulation amount, and a polar coordinate added with a modulation amount for correcting an enlargement ratio of an image to be subjected to a special effect. Correcting means for correcting the system address, and converting the polar coordinate system address corrected by the correcting means into a rectangular coordinate system address. A rectangular coordinate conversion means for generating a read address; and a determination means for determining whether or not the read address is within a range of an image to which a special effect is to be applied, based on a radial component of a polar coordinate system address. It is configured so that it can be transformed into a sphere having an arbitrary curvature.
With this configuration, a part of the input image can be deformed like a sphere, and the curvature of the sphere can be freely changed.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
(1st Embodiment)
The image special effect device according to the first embodiment of the present invention can enlarge a part of the original image (FIG. 4A) into a sphere as shown in FIG. You can change it freely.
As shown in FIG. 1, this apparatus includes a frame memory buffer 10 for temporarily storing a video signal for one frame inputted from the outside, a write address generating means 11 for generating a sequential write address, and a sequential read address. A read address generating means 12 for outputting a read address for reading an image signal from the frame memory buffer 10 as an input is provided.
[0007]
As shown in FIG. 2, the read address generation means 12 includes a CPU 32 for calculating various parameters from a radius R of a sphere to be deformed and displayed, a parameter k for adjusting a curvature, and a center position (xc, yc) of a special effect area, and a sequential. An adder 20 for adding the x-coordinate of the read address and the parameter (-xc) of the center position of the special effect area sent from the CPU 32, the y-coordinate of the sequential read address and the center position of the special effect area sent from the CPU 32 An adder 21 for adding the parameter (−yc) of the above, polar coordinate conversion means 22 for converting the xy coordinate system into an rθ coordinate system using the outputs of the adders 21 and 22 as input, and r output from the polar coordinate conversion means 22 A modulation amount generating means 23 for generating a basic modulation amount to be added to r from the radius R of the sphere sent from the CPU 32; A multiplier 24 for adjusting the amplitude of the basic modulation amount by multiplying the parameter k, an adder 25 for adding the output of the multiplier 24 and r, and an image of the special effect area continuously at the end of the special effect area. A multiplier 26 for multiplying the output of the adder 25 by an enlargement correction parameter c for correcting the image to be connected to an image outside the special effect area; an orthogonal coordinate conversion unit 27 for converting an rθ coordinate system to an xy coordinate system; An adder 29 for adding the x address converted into the xy coordinate system by the coordinate conversion means 27 and the parameter xc of the center position of the special effect area sent from the CPU 32; and a conversion to the xy coordinate system by the orthogonal coordinate conversion means 27 An adder 30 for adding the y-address obtained and the parameter yc of the center position of the special effect area sent from the CPU 32, and outputs from the adders 29 and 30 within the range of the special effect area. As a read address, and outside the range of the special effect area, a sequential read address x, y is output as a read address. The switching means 31 compares the polar coordinate r with the radius R of the sphere, and sends the read address to the switching means 31. And a determination unit 28 that outputs a switching signal of
[0008]
In FIG. 1, a write address generating means 11 generates a sequential address, and a video signal for one frame is written to the frame memory buffer 10 based on this address. The video signal for one frame is handled as one image signal. The read address generating means 12 generates a read address for applying a special effect from the input sequential read address, and an image signal is read from the corresponding read address of the frame memory buffer 10.
[0009]
The operation of the read address generation means 12 will be described with reference to FIG.
The x address of the sequential address is added to the parameter (−xc) of the center position of the special effect area sent from the CPU 32 by the adder 20, and the y address of the sequential address is added by the adder 21 to the CPU 32. It is added to the parameter (-yc) of the center position of the sent special effect area. The outputs of the adders 20 and 21 are input to a polar coordinate conversion means 22, and the sequential addresses in the xy coordinate system are converted into addresses in the rθ coordinate system with the origin at (xc, yc).
[0010]
The modulation amount generating means 23 generates a basic modulation amount of r from the polar coordinate r and the radius R of the sphere sent from the CPU 32. The basic modulation amount is multiplied by the curvature adjustment parameter k sent from the CPU 32 by the multiplier 24 to generate a modulation amount. The modulation amount is added to the polar coordinate r by the adder 25.
The multiplier 26 multiplies the polar coordinate r to which the modulation amount has been added by an enlargement correction parameter c for correcting the end of the special effect area so as to be continuously connected to an image outside the special effect area. The orthogonal coordinate conversion means 27 converts the address of the rθ coordinate system including the corrected polar coordinate r and the polar coordinate θ into the address of the xy coordinate system. The adder 29 adds the parameter xc of the center position of the special effect area sent from the CPU 32 to the x address output from the orthogonal coordinate conversion means 27. The y address output from the orthogonal coordinate conversion means 27 , The parameter yc of the center position of the special effect area sent from the CPU 32 is added by the adder 30.
[0011]
The switching unit 31 switches the output (X, Y) of the read address to the sequential address (x, y) or the output of the adders 29 and 30 according to the switching signal output from the determination unit 28.
The determination means 28 compares r output from the polar coordinate conversion means 22 with the radius R of the sphere sent from the CPU 32. If r is equal to or less than R, the outputs of the adders 29 and 30 are read out at the address ( X, Y), and when r exceeds R, a read address switching signal for setting the sequential address (x, y) as the read address (X, Y) is output to the switching means 31.
[0012]
The flowchart of FIG. 3 shows the operation procedure of the image special effect device. Note that, in each drawing of the flowchart, steps representing operation procedures are indicated by "S".
The frame memory buffer 10 writes the video signal for one frame into the frame memory according to the address output from the write address generating means 11 (Step 101). The sequential read address (x, y) is input to the read address generator 12 (Step 102).
[0013]
The adder 20 and the adder 21
x₁= X-xc
y₁= Y-yc
, The difference x from the center position of the effect to the read address x, y₁, Y₁Is obtained (step 103). Here, xc and yc are the x and y coordinates of the center position of the special effect area, that is, the center position of the sphere, and are set by the CPU 32.
[0014]
Polar coordinate conversion means 24
r = √ (x₁ ²+ Y₁ ²)
θ = tan^-1(Y₁/ X₁)
Gives the address (x₁, Y₁) Is converted to an address (θ, r) in the polar coordinate system (step 104).
[0015]
The modulation amount generating means 23 calculates, from r and the radius R of the sphere sent from the CPU 32,
r_m= Rsin^-1(R / R) -r
The basic modulation amount r_mIs obtained (step 105). Here, the basic modulation amount rm is a function as shown in FIG.
The multiplier 24
dr = kr_m
The modulation amount dr is obtained by the following (Step 106). Here, k is the amplitude of the modulation amount, and is a parameter for adjusting the curvature. This is set by the CPU 32.
[0016]
The adder 25
r₁= R + dr
Thus, the read address after modulation at r is obtained (step 107).
The multiplier 26
r₂= Cr₁
Thus, the read address is corrected so that the end of the special effect area is continuously connected to the image outside the special effect area (step 108). Here, the enlargement correction parameter c is
c = 1 / {k (π / 2-1) +1}
Is determined by the CPU 32 and set.
[0017]
The orthogonal coordinate conversion means 27
x₂= R₂cos θ
y₂= R₂sin θ
, The read address of the polar coordinate system (θ, r₂) To the address (x₂, Y₂) (Step 109).
The adder 29 and the adder 30
x₃= X₂+ Xc
y₃= Y₂+ Yc
Thus, the origin of the coordinate system is returned by adding the value of the center position (xc, yc) of the special effect area as an offset value, and is used as a read address for applying the special effect (step 110).
[0018]
The judging means 28 compares r in the polar coordinate system with the radius R of the sphere set by the CPU 32,
r <R
Is determined (step 111). When r <R, the switching unit 31 sets the read address (X, Y) as
X = x₃
Y = y₃
Is output (step 112). When r <R is not satisfied, the switching unit 31 sets the read address (X, Y) as
X = x
Y = y
Is output (step 113).
The read address generating means 12 reads the video signal for one frame written in the frame memory buffer 10 by using the read address (X, Y) (step 114).
[0019]
As described above, in this image special effect device, the curvature of the sphere can be freely changed by changing the amplitude of the modulation amount for changing the image into a sphere and correcting the enlargement ratio for the read address in the polar coordinate system r. And a spherical special effect corrected so as to be continuously connected to the special effect area of the image can be given.
[0020]
(Second embodiment)
As shown in FIG. 9B, the image special effect device according to the second embodiment of the present invention can remove the portion of the original image (FIG. 9A) outside the special effect area, and The phase of the image in the special effect area can be changed as if the image were rotated horizontally or vertically.
As shown in FIG. 6, the image special effect device includes black level output means 40 for outputting an image signal of a black level (or a fixed level such as a white level) outside the range of the special effect area. The read address generating means 12 receives the sequential read address as input, generates a read address of the frame memory buffer 10 and outputs the read address to the frame memory buffer 10, and generates a key signal indicating the inside / outside of the special effect area to generate a black signal. Output to the level output means 40. Other configurations are the same as those of the first embodiment (FIG. 1).
[0021]
As shown in FIG. 7, the configuration of the read address generation unit 12 corresponds to the configuration of the first embodiment (FIG. 2) except for the switching unit.
The CPU 32 also determines the radius R of the sphere to be deformed and displayed, the parameter k for adjusting the curvature, the center position (xc, yc) of the special effect area, and the image offset parameter (xd, yd). Various parameters are calculated from the parameters for obtaining the effect of horizontal rotation.
[0022]
The multiplier 26 multiplies the output of the adder 25 in which the modulation amount is added to the polar coordinate r by an enlargement correction parameter c for correcting the read address so that the sphere has a desired radius.
The determination means 28 outputs the determination result to the black level output means 40 as a key signal.
The adder 29 and the adder 30 add the image offset parameters (xd, yd) to the rectangular coordinates converted from the polar coordinates by the rectangular coordinate conversion means 27 to obtain the read address (X, Y) of the special effect area. Generate.
Other configurations and operations are the same as those of the first embodiment.
[0023]
The flowchart of FIG. 8 shows the operation of the image special effect device. In this flowchart, the procedure from step 101 to step 107 is the same as in the first embodiment (FIG. 3).
The multiplier 26 calculates r by adding the modulation amount to r.₁Using,
r₂= Cr₁
Thus, the read address is corrected so that the sphere has a desired radius (step 108). Here, the enlargement correction parameter c is
c = 1 / {k (π / 2-1) +1}
Is determined by the CPU 32 and set.
[0024]
The orthogonal coordinate conversion means 27
x₂= R₂cos θ
y₂= R₂sin θ
, The read address of the polar coordinate system (θ, r₂) To the address (x₂, Y₂) (Step 109).
The adder 29 and the adder 30
X = x₂+ Xd
Y = y₂+ Yd
Gives (x₂, Y₂) Is added to the values of xd and yd as offset values to obtain read addresses for applying special effects (step 201). Here, xd and yd are parameters for adjusting the phase of the image. By adjusting these parameters, an effect of rotating the image in the special effect area vertically or horizontally can be realized. When xd = xc and yd = yc, the image is not rotated.
[0025]
The judging means 28 compares r in the polar coordinate system with the radius R of the sphere set by the CPU 32,
r <R
Is determined (step 111). If r <R, the judging means 28 outputs the key signal as 1 (step 202), and if r <R, outputs the key signal as 0 (step 203).
[0026]
The read address generation means 12 reads the video signal for one frame written in the frame memory buffer 10 by using the read address (X, Y) (step 114).
When the key signal output from the read address generation means 12 is 0, the black level output means 40 converts the signal into a black level image signal and outputs it (step 204).
[0027]
As described above, the image special effect device adds the offset value for adjusting the horizontal or vertical rotation of the image after performing the orthogonal coordinate transformation, and outputs the key signal output from the determination unit to the black level output. Has given to the means. By doing so, the portion of the image outside the special effect area can be removed, and the phase of the image in the special effect area can be changed as if the sphere were rotated horizontally or vertically.
[0028]
Here, the case where the part other than the special effect area is displayed in black has been described. However, the part other than the special effect area is whitened as shown in FIG. It can also be displayed.
[0029]
(Third embodiment)
The image special effect device according to the third embodiment of the present invention can remove the portion of the original image (FIG. 12A) outside the special effect area as shown in FIG. The image in the effect area can be rotated two-dimensionally.
The overall configuration of this device is the same as in the second embodiment (FIG. 6). As shown in FIG. 10, the read address generation unit 12 includes an adder 50 that adds the two-dimensional rotation amount θc to the polar coordinate θ generated by the polar coordinate conversion unit 22 and outputs the result to the orthogonal coordinate conversion unit 27. . The CPU 32 also calculates various parameters from the radius R of the sphere to be deformed and displayed, the parameter k for adjusting the curvature, the center position (xc, yc) of the special effect area, the image offset parameter (xd, yd), and the two-dimensional rotation amount θc. Calculate.
Other configurations are the same as those of the second embodiment (FIG. 7).
[0030]
The flowchart of FIG. 11 shows the operation of the image special effect device. In this flowchart, the procedure from step 101 to step 108 is the same as in the second embodiment (FIG. 8).
The adder 50, based on the polar coordinate θ converted by the polar coordinate conversion means 22,
θ₁= Θ + θc
Gives the offset θc plus θ₁Is obtained (step 301). Here, θc is a parameter of the two-dimensional rotation amount set by the CPU 32, and by adjusting this parameter, an effect as if the image in the special effect area is two-dimensionally rotated can be provided.
[0031]
The orthogonal coordinate conversion means 27
x₂= R₂cos θ₁
y₂= R₂sin θ₁
Gives the read address of the polar coordinate system (θ₁, R₂) To the address (x₂, Y₂) (Step 109).
The procedure from step 201 to step 204 thereafter is the same as in the second embodiment (FIG. 8).
[0032]
As described above, in this image special effect device, the orthogonal coordinate conversion is performed after adding the offset value to θ after the polar coordinate conversion. This makes it possible to realize a special effect in which a spherical image displayed only in the special effect area is two-dimensionally rotated.
[0033]
(Fourth embodiment)
As shown in FIG. 15B, the image special effect device according to the fourth embodiment of the present invention connects the left end to the right end of the original image (FIG. 15A) even when the sphere is rotated. Can be displayed without interruption.
The overall configuration of this device is the same as in the second embodiment (FIG. 6). As shown in FIG. 13, the read address generation means 12 repeats the address value within the effective screen range even if the address values output from the adders 29 and 30 are out of the effective screen range. It has. The CPU 32 also determines the radius R of the sphere to be deformed and displayed, the parameter k for adjusting the curvature, the center position (xc, yc) of the special effect area, the image offset parameter (xd, yd), and the vertical and horizontal dimensions wx of the image. , Wy are calculated.
Other configurations are the same as those of the second embodiment (FIG. 7).
[0034]
The flowchart of FIG. 14 shows the operation of the image special effect device. In this flowchart, the procedure from step 101 to step 109 is the same as in the second embodiment (FIG. 8).
The adder 29 and the adder 30 calculate the orthogonally transformed coordinate value x.₂, Y₂To the offset values xd and yd,
x₃= X₂+ Xd
y₃= Y₂+ Yd
As a result, a read address for applying a special effect is obtained (step 201).
[0035]
The repetitive address generation means 60
X = mod (x₃, Wx)
Y = mod (y₃, Wy)
Is converted to an address within the effective screen range (step 401). Here, wx and wy are the vertical and horizontal sizes of the image, and mod (A, B) is an operation for obtaining the remainder of A / B.
[0036]
Therefore, x₃If <wx, X = x₃And x₃If ≧ wx, X = x₃−wx. That is, x₃, Y₃Is outside the effective screen range, x₃, Y₃Is subtracted from the size wx, wy of the effective screen range to generate a read address within the effective screen range.
The subsequent steps 111 to 204 are the same as in the second embodiment (FIG. 8).
[0037]
As described above, in this image special effect device, the output read address is repeated in the effective pixel range. In this way, even when a rotated sphere is displayed in the special effect area, the image can be displayed without interruption.
[0038]
(Fifth embodiment)
As shown in FIG. 18, the image special effect device according to the fifth embodiment of the present invention can display a spherical special effect image symmetrically at a reference position.
The overall configuration of this device is the same as in the first embodiment (FIG. 1). As shown in FIG. 16, the read address generation means 12 includes a radius R of the sphere to be deformed and displayed, a parameter k for adjusting the curvature, a center position (xc, yc) of the special effect area, and a symmetric reference position (xb, yb). CPU 32 for calculating various parameters from the above, an area dividing means 70 for converting a sequential read address into an address which is symmetrically folded at a reference position, an x coordinate output from the area dividing means 70 and a special effect area sent from the CPU 32 The adder 20 adds the parameter (-xc) of the center position, and adds the y coordinate output from the area dividing means 70 and the parameter (-yc) of the center position of the special effect area sent from the CPU 32. The addresses obtained by the adders 29 and 30 based on the adder 21 and the return flag signal output from the area dividing means 70. , A symmetric effect generating means 71 for generating a read address for giving a special effect symmetric to the special effect given by the address value, and a read-out output from the symmetric effect generating means 71 by a switching signal from the judging means 28 Switching means 31 for switching and outputting an address or a sequential read address. Other configurations are the same as those of the first embodiment (FIG. 2).
[0039]
The flowchart of FIG. 17 shows the operation of the image special effect device.
The frame memory buffer 10 writes the video signal for one frame into the frame memory according to the address output from the write address generating means 11 (Step 101).
When the sequential read address (x, y) is input to the read address generating means 12 (Step 102), the area dividing means 70
x <xb
Is determined (step 501). When x <xb, the area dividing means 70
x₀= X
And 0 is set as the division X flag (step 502). When x ≧ xb, the area dividing means 70 sets the address to be symmetrically folded back from the reference position.
x₀= 2xb-x
And 1 is set as the division X flag (step 503).
[0040]
Similarly, for the y coordinate, the region dividing means 70
y <yb
(Step 504), and when y <yb, the area dividing means 70
y₀= Y
And 0 is set as the division Y flag (step 505). When y ≧ yb, the area dividing means 70
y₀= 2yb-y
And 1 is set as the division Y flag (step 506).
[0041]
The adder 20 and the adder 21
x₁= X₀-Xc
y₁= Y₀-Yc
, The difference x from the center position of the special effect area to the read addresses x, y₁, Y₁Is obtained (step 103).
[0042]
The procedure from step 104 to step 110 is the same as in the first embodiment (FIG. 3).
That is, the polar coordinate conversion means 24
r = √ (x₁ ²+ Y₁ ²)
θ = tan^-1(Y₁/ X₁)
Gives the address (x₁, Y₁) Is converted to an address (θ, r) in the polar coordinate system (step 104).
The modulation amount generating means 23 calculates, from r and the radius R of the sphere sent from the CPU 32,
r_m= Rsin^-1(R / R) -r
The basic modulation amount r_mIs obtained (step 105). Here, the basic modulation amount rm is a function as shown in FIG.
The multiplier 24
dr = kr_m
The modulation amount dr is obtained by the following (Step 106). Here, k is the amplitude of the modulation amount, and is a parameter for adjusting the curvature. This is set by the CPU 32.
[0043]
The adder 25
r₁= R + dr
Thus, the read address after modulation at r is obtained (step 107).
The multiplier 26
r₂= Cr₁
Thus, the read address is corrected so that the end of the special effect area is continuously connected to the image outside the special effect area (step 108). Here, the enlargement correction parameter c is
c = 1 / {k (π / 2-1) +1}
Is determined by the CPU 32 and set.
The orthogonal coordinate conversion means 27
x₂= R₂cos θ
y₂= R₂sin θ
, The read address of the polar coordinate system (θ, r₂) To the address (x₂, Y₂) (Step 109).
[0044]
The adder 29 and the adder 30
x₃= X₂+ Xc
y₃= Y₂+ Yc
Thus, the origin of the coordinate system is returned by adding the value of the center position (xc, yc) of the special effect area as an offset value, and is used as a read address for applying the special effect (step 110).
The symmetry effect generating means 71 determines whether or not the division X flag is 0 (step 507).
x₄= X₃
(Step 508). When the division X flag is 1,
x₄= 2xb-x₃
(Step 509).
[0045]
Similarly, for the y coordinate, the symmetry effect generating means 71 determines whether or not the division Y flag is 0 (step 510).
y₄= Y₃
(Step 511). When the division Y flag is 1,
y₄= 2yb-y₃
(Step 512).
[0046]
The judging means 28 compares r in the polar coordinate system with the radius R of the sphere set by the CPU 32,
r <R
Is determined (step 111). When r <R, the switching unit 31 sets the read address (X, Y) as
X = x₄
Y = y₄
Is output (step 112). When r <R is not satisfied, the switching unit 31 sets the read address (X, Y) as
X = x
Y = y
Is output (step 113).
The read address generating means 12 reads the video signal for one frame written in the frame memory buffer 10 by using the read address (X, Y) (step 114).
[0047]
As described above, in this image special effect device, after the input read address is turned back by the area dividing means so as to be symmetrical at the reference position, the read address is generated so as to obtain a spherical special effect. Processing is performed by the symmetric effect generation means to restore the folded read address. In this way, a spherical special effect symmetrical with respect to the reference position can be provided.
[0048]
In this embodiment, a case has been described in which a spherical special effect is applied to the xy axis axis symmetry. Then, processing may be performed so as to restore this return.
Also in this case, as shown in the second embodiment, the image outside the special effect area may be excluded.
[0049]
【The invention's effect】
As is apparent from the above description, the image special effect device of the present invention can deform a part of the input image into a sphere, and can freely change the curvature of the sphere. Therefore, the input image can be deformed into a spherical shape having a desired roundness.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration of an image special effect device according to a first embodiment of the present invention.
FIG. 2 is a block diagram illustrating a configuration of a read address generation unit of the image special effect device according to the first embodiment of the present invention.
FIG. 3 is a flowchart illustrating a processing procedure of the image special effect device according to the first embodiment of the present invention.
FIG. 4 is a diagram schematically showing an image to which a special effect has been added by the image special effect device according to the first embodiment of the present invention.
FIG. 5 is a diagram showing a function for giving a basic modulation amount in the image special effect device according to the embodiment of the present invention.
FIG. 6 is a block diagram illustrating a configuration of an image special effect device according to a second embodiment of the present invention.
FIG. 7 is a block diagram illustrating a configuration of a read address generation unit of the image special effect device according to the second embodiment of the present invention.
FIG. 8 is a flowchart showing a processing procedure of the image special effect device according to the second embodiment of the present invention.
FIG. 9 is a diagram schematically showing an image to which a special effect has been added by the image special effect device according to the second embodiment of the present invention.
FIG. 10 is a block diagram illustrating a configuration of a read address generation unit of the image special effect device according to the third embodiment of the present invention.
FIG. 11 is a flowchart illustrating a processing procedure of the image special effect device according to the third embodiment of the present invention.
FIG. 12 is a diagram schematically showing an image to which a special effect has been added by the image special effect device according to the third embodiment of the present invention.
FIG. 13 is a block diagram illustrating a configuration of a read address generation unit of the image special effect device according to the fourth embodiment of the present invention.
FIG. 14 is a flowchart illustrating a processing procedure of the image special effect device according to the fourth embodiment of the present invention.
FIG. 15 is a diagram schematically showing an image to which a special effect has been added by the image special effect device according to the fourth embodiment of the present invention.
FIG. 16 is a block diagram illustrating a configuration of a read address generation unit of an image special effect device according to a fifth embodiment of the present invention.
FIG. 17 is a flowchart illustrating a processing procedure of the image special effect device according to the fifth embodiment of the present invention.
FIG. 18 is a diagram schematically illustrating an image to which a special effect has been added by the image special effect device according to the fifth embodiment of the present invention.
[Explanation of symbols]
10 frame memory buffer
11 Write address generating means
12 Read address generation means
20 ° adder
21 adder
22 Polar coordinate conversion means
23 ° modulation amount generating means
24 multiplier
25 adder
26 multiplier
27 ° Cartesian coordinate conversion means
28 ° judgment means
29 ° adder
30 ° adder
31 ° switching means
32 CPU
40 ° black level output means
50 ° adder
60 ° repeated address generation means
70 ° area dividing means
71 ° symmetry effect generating means

Claims (8)

By temporarily storing an image signal input from the outside in a memory buffer and reading out the image signal stored in the memory buffer by using a read address generated by a read address generation unit, the image stored in the memory buffer is read out. In an image special effects device that applies special effects to signals,
The read address generation means,
Polar coordinate conversion means for converting the rectangular coordinate system address to a polar coordinate system address having the origin at the center of the image to be subjected to the special effect;
Modulation amount generating means for generating a modulation amount of the polar coordinate system address,
Modulation amount amplitude adjustment means for adjusting the amplitude of the modulation amount,
Correction means for correcting the polar coordinate system address to which the modulation amount has been added in order to correct the enlargement ratio of the image to which the special effect is applied;
Cartesian coordinate conversion means for converting the polar coordinate system address corrected by the correction means to a rectangular coordinate system address to generate a read address,
Determining means for determining whether or not the read address is within the range of the image to which the special effect is to be applied, based on a radius component of the polar coordinate system address, and transforms a part of the input image into a sphere having an arbitrary curvature. An image special effect device characterized by the above-mentioned. Switching means for switching the read address of the memory buffer to the read address generated by the orthogonal coordinate conversion means only when the determination means determines that the read address is within the range of the image to which the special effect is applied. The image special effect device according to claim 1, wherein: When the determination means determines that the read address is outside the range of the image to which the special effect is applied, the determination means includes a fixed level output means for outputting a fixed level image signal, and wherein the determination means performs the special effect 2. The image special effect device according to claim 1, wherein the image signal read from the memory buffer is output only when it is determined that the image signal is within the range of the image to be processed. The orthogonal coordinate conversion unit converts the polar coordinate system address corrected by the correction unit into a rectangular coordinate system address, and adds a coordinate value of a center of an image to which the special effect is applied to the rectangular coordinate system address, 4. The image special effect device according to claim 1, wherein a read address is generated. The orthogonal coordinate conversion unit converts the polar coordinate system address corrected by the correction unit into a rectangular coordinate system address, adds an offset value to the rectangular coordinate system address, and generates the read address. The image special effect device according to any one of claims 1 to 3, wherein Two-dimensional rotation amount adding means for controlling a rotation amount of the two-dimensional rotation of the polar coordinate system address, wherein the rectangular coordinate conversion means converts the two-dimensional rotation amount with respect to the polar coordinate system address converted to the rectangular coordinate system address. 6. The image special effect device according to claim 1, wherein the rotation amount of the two-dimensional rotation is added by the adding means. When the read address generated by the orthogonal coordinate conversion means deviates from the effective screen range, a repetitive address generation is performed to subtract the size of the effective screen range from the read address and generate a read address within the effective screen range. 6. The image special effect device according to claim 5, further comprising means. Dividing the area of the memory buffer into a plurality of symmetrical areas, generating a read address for applying the special effect to one of the areas, and, based on the read address, in each of the plurality of areas 8. The image special effect device according to claim 1, wherein a read address for giving a special effect symmetric to the special effect is generated.

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