JP2969942B2 - Image conversion device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image conversion device, and is particularly suitable for application to a special effect device for giving a special effect to a television signal.

B. SUMMARY OF THE INVENTION The present invention relates to an image conversion apparatus which applies a special effect to an input image by outputting an input image stored in a memory based on a read address obtained as a result of a predetermined arithmetic processing, wherein the read address is discontinuous. By forming a blanking region in advance in a predetermined region of the input image corresponding to the region of the output image, it is possible to prevent an unsightly stepped jaggedness on the display image in the discontinuous region of the read address of the output image. can do.

C Prior Art Conventionally, in this kind of special effect device, a television signal is subjected to a digital signal conversion process to obtain a 3D signal.
Japanese Patent Application Laid-Open No. Sho 61-230477 proposes an image which appears as if an input image is pasted on a three-dimensional curved surface (for example, a cylindrical curved surface) on a display.

In this type of image conversion method, an input image is divided into blocks of a predetermined size, the image data of each block is sequentially stored at a predetermined address in a memory by a write address, and the stored pre-conversion image data is stored. A predetermined operation is performed on the address of the input image data based on the conversion input data separately input by the operator through the input means, and an output image obtained by pasting the input image on a predetermined three-dimensional curved surface. Thus, when assembling the output image by raster scanning, the input image is read by reading the block image data stored at a predetermined address in the memory in accordance with the read address obtained by the above operation result. Thus, an output image consisting of a two-dimensional plane, which is apparently converted into a three-dimensional curved surface, is obtained.

Here, the read address value obtained as a result of the operation is
If the value is a value that represents the operation result as it is, the address value may not be a predetermined address value in the memory but may be a fractional address value.

Therefore, in this case, the interpolating means adds predetermined values to the image data at the addresses before and after the address in the memory corresponding to the read address value having the fraction (that is, the blocks before and after the corresponding block of the input image before conversion). After multiplying by the coefficient of (i), by adding them, this is made the image data corresponding to the read address obtained as a result of the operation.

However, when an output image is to be interpolated by such an interpolation means, for example, an input image VDIN as shown in FIG. 4 (A) is converted into an input image VDIN as shown in FIG. 4 (B). When a conversion such as winding around the cylindrical surface IM is performed, a folded portion TN of the input image VDIN occurs on the cylindrical surface IM, and the folded portion TN is generated.
In, because the image is folded back,
The image is interrupted on the display image. In this portion, the addresses assigned to the blocks of the input image VDIN become discontinuous on the output image VDOUT1, and interpolation cannot be performed.

As a result, the fraction of the address value obtained by the calculation is truncated, so that the output image is as shown in FIG.
As shown in (1), the image does not become a smooth straight line (or curve) in the folded portion TN, but an unpleasant step-like jaggedness occurs, and there is a problem that the output image is deteriorated.

The present invention has been made in view of the above points, and has as its object to propose an image conversion device capable of preventing an unsightly stepped jagged edge of an output image from being generated on a display image.

Means for Solving the Problem In order to solve the problem, according to the present invention, there is provided a memory 12 for storing an input image VDIN formed of a two-dimensional plane formed by an input video signal SVIN, and an input image VDIN of the memory.
Computing means 15 and 19 for computing read addresses for winding the cylindrical curved surface IM by dividing the data into a predetermined size, and based on the read addresses obtained as a result of the computation, input images of addresses before and after the read address having a fraction. The data is read out from the memory 12, and these image data are multiplied by predetermined coefficients, respectively, added to each other, and the output image SVOU
An interpolation means 13 for forming T, and an input image VD in the memory 12 corresponding to a folded portion of the cylindrical surface IM in the output image SVOUT.
Black level blanking area BLK for IN area in advance
And blanking region forming means 11 for forming

F function For an area TN where the read address is discontinuous on the output image VDOUT2, an input image corresponding to the discontinuous area TN
By forming the blanking area BLK in the area on VDIN in advance, it is possible to execute an interpolation process between each area where the read address on the output image VDOUT2 is discontinuous and the blanking area BLK.

In the blanking area BLK, there is a portion where the read address is discontinuous.
Since all the BLKs are configured with the same image information, it is possible to prevent the output image from having an unsightly stepped jaggedness on the display image.

G Example Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 10 denotes an image conversion device as a whole,
An input video signal SVIN is transmitted to a frame memory 12 via a blanking area (BLK) adding circuit 11.

Here, the frame memory 12 stores the write address generation circuit 17
A block memory obtained by dividing image data for one frame of the input image VDIN input by the input video signal SVIN into a predetermined size based on the write address signal S3 transmitted from the The address in the block 12 is designated, and the image data of each block is sequentially stored according to the assigned address.

Here, the CPU (central processing unit) 15 reads out the image data of each block of the input image VDIN stored in the frame memory 12 by using the read address signal S6 sent from the read address generating circuit 19, thereby obtaining the second data. Figure (A)
As shown in FIG. 7, each block of the input image VDIN is converted into an output image VDOUT2 (FIG. 2 (C)) in which the blocks are sequentially pasted on a pseudo three-dimensional surface on a predetermined three-dimensional surface (for example, a cylindrical surface) IM. It has been made like that.

Here, in the cylindrical curved surface IM of the output image VDOUT2, the screen information becomes discontinuous due to the discontinuous readout of the continuous blocks of the input image VDIN in the folded portion TN, and interpolation processing is executed in this portion. I cannot do it.

Accordingly, the CPU 15 executes a process of forming a black-level blanking region in advance on the input image VDIN serving as the original image of the output image VDOUT2 for the folded portion TN where the image information is discontinuous as the output image VDOUT2.

That is, as a result of the arithmetic processing, the CPU 15 sends the address of the frame memory 12 in which the image data to be the address discontinuous portion (TN) on the output image VDOUT2 is stored to the comparing circuit 18 in advance as the address discontinuous position designation signal S4.

The comparison circuit 18 is provided from the CPU 15 to the write address generation circuit 17.
A write address signal S3 input through the input port is input. When the write address specified by the write address signal S3 matches the address previously specified by the address discontinuous position specifying signal S4, the block By transmitting the ranking addition signal S1 to the BLK addition circuit 11, a predetermined area including the discontinuous portion in the input video signal SVIN is changed to a black level.

As a result, as shown in FIG. 2 (B), the output image VDOUT2
The input image VDIN in a state where a blanking area BLK having a black level is formed in advance in an area to be a folded portion TN
Is stored in the frame memory 12.

Accordingly, the input video signal SVIN, which has changed to the black level in the discontinuous portion, is output as a discontinuous portion (T) as an output image by the write address signal S3 in the frame memory 12.
N) is stored in the address area assigned.

On the other hand, when outputting an output image obtained by applying a special effect to the input image, the CPU 15 calculates a read address by a predetermined operation based on the conversion data input by the input device separately, and reads out the read address. By sending the address as a read address signal S6 to the frame memory 12 via the read address generating circuit 19, each address area in the frame memory 12 in which the input video signal VDIN is stored is read by the read address. The image data in the designated address is read.

As a result, for the blanking area BLK which has been changed to the black level and stored in advance, the address discontinuity portion (return portion) of the output image VDOUT2 is determined by the read address.
TN).

Therefore, in the address discontinuity part (TN), a blanking area BLK having a black level continuous with the first image area # 1 actually displayed and a part turned off on the back side are hidden. A blanking area BLK having a continuous black level exists in the second image area # 2, and when the interpolation processing is performed in the subsequent interpolation circuit 13, the area between the first image area # 1 and the blanking area BLK becomes Smooth interpolation can be performed between the second image area # 2 and the blanking area BLK.

On the other hand, the blanking region BLK at the black level is discontinuous at the folded portion TN,
Although it is difficult to perform interpolation processing, since all image information is composed of black levels, even if a step-like jaggedness occurs in this part, it should not appear on the surface image. Can be.

Further, since the image is compressed and displayed in the folded area TN, the blanking area BLK can be made inconspicuous.

Therefore, it is possible to obtain the output image VDOUT2 free from the unsightly stepped jaggedness as in the related art.

According to the above configuration, when a discontinuous portion (TN) of the address occurs on the output image VDOUT2, the blanking region which is previously set to the black level is provided in the discontinuous designated region on the input image VDIN converted into the discontinuous portion. Is formed, a discontinuous portion (TN) can be formed in the blanking area, thereby making an unsightly stair-like jaggedness invisible on a display image. Can be.

In the above-described embodiment, the case where the input image is converted into the cylindrical curved surface IM has been described. However, the present invention is not limited to this. For example, a conversion such as turning over a page with respect to the input image VDIN as shown in FIG. In this case, by forming the blanking region BLK in the portion where the read address becomes discontinuous, it is possible to prevent an unsightly stepped jagged shape. It can be widely applied to image conversion such that

Further, in the above-described embodiment, the case where the blanking region BLK having a black level is formed has been described. However, the present invention is not limited to this, and blanking regions having various colors are formed according to the input image VDIN. obtain.

Further, in the above-described embodiment, the case where the blanking region BLK is formed for the input image has been described.
The present invention is not limited to this. For example, by performing the same processing as described above on a key signal, it is possible to suppress jaggedness of an image keyed by the key signal.

H Advantageous Effects of the Invention As described above, according to the present invention, a blanking area is formed in advance in an area where addresses are discontinuous in an output image, in the area of the input image.
It is possible to realize an image conversion device capable of preventing an unsightly stair-like jaggedness from appearing on a display image in the address discontinuity area in the output image.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of an image conversion apparatus according to the present invention, FIG. 2 is a schematic diagram used for explaining an image conversion method according to the present invention, and FIG. 3 is a schematic diagram used for explaining another embodiment. FIG. 4 is a schematic diagram for explaining conventional image conversion. 10 ... Image conversion device, 11 ... BLK addition circuit, 12 ... Frame memory, 13 ... Interpolation circuit, 15 ... CPU, VDIN ... Input image, VDOUT1, VDOUT2 ... Output image, IM ... Cylindrical surface , TN: Turn-back part, BLK: Blanking area.

Claims (1)

(57) [Claims] 1. A memory for storing an input image formed of a two-dimensional plane formed by an input video signal, and a read address for winding the input image into a predetermined size in the memory and winding it around a cylindrical curved surface. Calculating means for calculating, based on the read address obtained as a result of the calculation, reading the input image data at addresses before and after the read address having a fraction from the memory, and multiplying the image data by a predetermined coefficient. Interpolating means for adding these to each other to form an output image; and forming a black-level blanking region in advance in the input image region in the memory corresponding to the folded portion of the cylindrical curved surface in the output image. And a blanking region forming means.