JPH04207869A - Image converter - Google Patents

Abstract

PURPOSE:To obviate the generation of unsightly staircase-like zigzags on displayed images in an address discontinuous region of the output images by previously forming a blanking region in the region where addresses are discontinuous on the input images to the above-mentioned region of the output image. CONSTITUTION:A comparator circuit 18 is inputted with the writing address signal S3 inputted via a writing address generating circuit 17 from a CPU 15 and transmits a blanking addition signal S1 to a BLK adding circuit 11 when the writing address assigned by this writing address signal S3 coincides with the address previously assigned by an address discontinuous position assignment signal S4, by which the prescribed region including this discontinuous assigned part of the input video signal SVIN is changed to a black level. The input video signal SVIN changed to the black level in this discontinuous assignment part is stored as the output image to the address region allotted to the discontinuous part (TN) in the frame memory 12.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to an image conversion device, and is particularly suitable for application to a special effects device that applies special effects to television signals.

B. Summary of the Invention The present invention provides an image conversion device that provides a special effect to an input image by outputting an input image stored in a memory based on read addresses obtained as a result of predetermined arithmetic processing, in which the read addresses are discontinuous. By forming a blanking area in advance in a predetermined area of the input image corresponding to the area of the output image, it is possible to prevent unsightly step-like jaggedness from occurring on the display image in the discontinuous area of the readout address of the output image. can do.

C. Conventional technology Conventionally, this type of special effects device converts a television signal into a digital signal to create an image on a display that looks like an input image pasted onto a three-dimensional curved surface (for example, a cylindrical curved surface). A display device has been proposed (Japanese Unexamined Patent Publication No. 61-230477).

This type of image conversion method divides an input image into blocks of a predetermined size, sequentially stores the image data of each block at a predetermined address in a memory using a write address, and simultaneously stores the stored input image before conversion. A predetermined operation is performed on the data address based on conversion input data manually input by an operator using a separate input means, and an output image that looks like the input image is pasted onto a predetermined three-dimensional curved surface is created. When assembling the output image by rask scanning, the input image is apparently converted into a three-dimensional curved surface by reading the image data of the block stored at a predetermined address in the memory according to the read address obtained from the above calculation result. An output image consisting of a two-dimensional plane is obtained.

Here, since the read address value obtained as a result of the calculation is a value that directly represents the calculation result, it may not be an address value determined in advance in the memory, but may be an address value having a fraction.

Therefore, in this case, the interpolation means applies a predetermined coefficient 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). By adding these after the multiplication, this is made into image data corresponding to the read address obtained as a result of the calculation.

Problem to be Solved by the Invention However, when an attempt is made to interpolate an output image using such an interpolation means, for example, the input image VDIN as shown in FIG. 4(A) is transformed into a cylindrical curved surface as shown in FIG. 4(B). When performing a transformation such as wrapping around IM, the cylindrical curved surface 1
A folded part molecule N of the input image ■DIN is generated on M, and in the folded part molecule N, the image is folded to the back side, so that the image on the display image is cut off.
In this portion, the addresses assigned to each block of the input image VDIN are discontinuous on the output image VDO1JTl, making interpolation impossible.

Since the fraction of the address value obtained by this result calculation is rounded down, the output image will not be a smooth straight line (or curve) at the folding part molecule N, as shown in Figure 4 (B). There was a problem in that an unsightly step-like jagged appearance appeared on the image, resulting in deterioration of the output image.

The present invention has been made in consideration of the above points, and it is an object of the present invention to propose an image conversion device that can prevent unsightly step-like jaggedness from appearing in output images.

Means for Solving Problem Ei In order to solve this problem, in the present invention, an input image VDIN which is a two-dimensional plane formed by an input video signal 5VIN is stored in the memory I2, and the input image VDIN in the memory 12 is stored in a predetermined manner. The three-dimensional curved surface I is divided into sizes of
An image conversion operation such as pasting onto a polygonal pseudo-curved surface on M is executed, and data of the input image is read out from the memory 12 based on the readout address obtained as a result of the image conversion operation, and the read image data is In the image conversion device 10 that displays the three-dimensional curved surface IM as an output image VDOUT2 on a two-dimensional plane by performing interpolation processing,
A blanking area BLK is formed in advance in an area TN of the input image VDIN that corresponds to an area in which the read addresses in the output image VDOUT2 are discontinuous.

For an area TN in which read addresses are discontinuous on the F action output image VDOUT2, a blanking area BL is created in advance in an area on the input image VDIN corresponding to the discontinuous area TN.
By forming B in advance, interpolation processing can be performed between each area of discontinuous read addresses on the output image VDOUT2 and the blanking area BLK.

In addition, although there are parts in the blanking area BLK where the read addresses are discontinuous, the blanking area BLK is all composed of the same image information, so the output image displays an unsightly step-like jagged part. You can prevent image distortion.

G example An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, 10 indicates the image conversion device as a whole;
Blanking area (BLK) for input video signal 5VIN
It is sent to the frame memory 12 via the additional circuit 11.

Here, the frame memory 12 is the write address generation circuit 1.
Based on the write address signal S3 sent from 7,
Input image V input by input video signal 5VIN
Specify an address in the frame memory 12 for each block formed by dividing the image data of one frame of DIN into predetermined sizes, and sequentially store the image data of each block according to the assigned address. do.

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 using the successive address signal S6 sent from the read address generation circuit 19, as shown in FIG. An output image V in which each block of the input image VDIN as shown in FIG.
DOUT2 (FIG. 2(C)).

Here, on the cylindrical curved surface IM of the output image VDOUT2, each continuous block of the input image VDIN is read out discontinuously at the folding part molecule N, so that the screen information becomes discontinuous, and the interpolation process is executed in this part. You won't get any more.

Therefore, the CPU 15 executes a process of forming a black level blanking area in advance on the input image VDIN, which is the original image of the output image VDOUT2, for the folded part molecule N whose image information is discontinuous as the output image VDOUT2.

That is, the CPU 15 outputs the output image VDO as a result of the arithmetic processing.
The address of the frame memory 12 in which the image data forming the address discontinuous portion (TN) on the UT2 is stored is sent in advance to the comparison circuit 18 as the address discontinuous position designation signal S4.

The comparator circuit 18 receives a write address signal S3 input from the CPU 5 via the write address generation circuit 17, and the write address specified by the write address signal S3 is preset by the address discontinuous position designation signal S.
4, by sending the blanking addition signal S1 to the BLK addition circuit 11, a predetermined area of the input video signal 5VIN including the discontinuous specified portion is changed to black level. .

As a result, as shown in FIG. 2(B), the output image VDOU
As T2, the input image VDIN is stored in the frame memory 12 with a blanking area BLK having a black level formed in advance in the area that will become the folded part molecule N.

Therefore, the input video signal 5VIN whose level has changed to black at the designated discontinuous portion is stored as an output image in the address area assigned to the discontinuous portion (TN) in the frame memory 12 by the write address signal S3.

On the other hand, when outputting an output image with special effects applied to the input image, the CPU 15 calculates a read address by a predetermined calculation based on conversion data inputted by a separate input device, and uses the read address as the read address. By sending the signal S6 to the frame memory 12 via the read address generation circuit 19, the input video signal VDIN is sent to the frame memory 12 via the read address generation circuit 19, and the address specified by the read address is transmitted to each address area in the frame memory 12 where the input video signal VDIN is stored. The image data is read out.

As a result, regarding the blanking area BLK that has been changed to black level and stored in advance, the output image VDOUT2(7)7 address discontinuous portion (
It is assigned to the folded part molecule N).

Therefore, in the address discontinuous portion (TN), there is a blanking area BLK with a black level that is continuous with the first image area X1 that is actually displayed, and a blanking area BLK that is folded back and partially hidden. There is a blanking area BLK with a continuous black level in the second image area Smooth interpolation can be performed between the image area X2 and the blanking area BLK.

On the other hand, the blanking area BLK consisting of the black level is discontinuous at the folding part molecule N, making it difficult to perform interpolation processing, but the image information is entirely composed of the black level. By this,
Even if step-like jaggedness occurs in this portion, it can be prevented from appearing on the displayed image.

Furthermore, since the image is compressed and displayed in the turning area TN, the blanking area BLK can be made less noticeable.

Therefore, it is possible to obtain an output image VDOUT2 that does not have the unsightly step-like jaggedness that is conventional.

According to the above configuration, when a discontinuous part (TN) of addresses occurs on the output image VDOUT2, a blanking area that is previously set at a black level is set in the discontinuous designated area on the input image VDLN that is converted into the discontinuous part. By forming a discontinuous portion (TN) in the blanking area, it is possible to form a discontinuous portion (TN) within the blanking area, thereby eliminating unsightly step-like jaggedness in the display image. be able to.

In the above-described embodiment, a case was described in which an input image was converted into a cylindrical curved surface IM, but the present invention is not limited to this. For example, as shown in FIG. Even when using a blanking area BLK where the read addresses are discontinuous,
By forming , it is possible to prevent unsightly step-like jaggedness from occurring, and in short, it can be widely applied to image conversion where read addresses are discontinuous.

Further, in the above-described embodiment, a case was described in which a blanking area BLK having a black level was formed, but the present invention is not limited to this, and blanking areas having various colors may be formed depending on the input image VDIN. obtain.

Furthermore, in the above-mentioned embodiment, the case where the blanking area BLK was formed for the input image was 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 in an image keyed by the key signal.

H Effects of the Invention As described above, according to the present invention, for areas where addresses are discontinuous in the output image, by forming a blanking area in advance in the area on the input image, It is possible to realize an image conversion device that can prevent unsightly step-like jaggedness from appearing on a display image in the address discontinuous area.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the image conversion device according to the present invention, FIG. 2 is a route map for explaining the image conversion method according to the present invention, and FIG. 3 is a route map for explaining another embodiment. , FIG. 4 is a route map for explaining conventional image conversion. 10... Image conversion device, 11... BL
K addition circuit, 12... Frame memory, 13.
...Interpolation circuit, 15...CPU, VDI
N...Input image, VDOUTI, VDOUT2
...Output image, IM...Cylindrical curved surface, T
N: Return portion, BLK: Blanking area. ! Q-1. , 5 - Figure 2

Claims (1)

[Claims] An input image consisting of a two-dimensional plane formed by an input video signal is stored in a memory, and the input image in the memory is divided into predetermined sizes to create a pseudo polygon on a three-dimensional curved surface. Executing an image conversion operation such as pasting onto a curved surface, reading data of the input image from the memory based on a read address obtained as a result of the image conversion operation, and performing interpolation processing on the read image data. Accordingly, in an image conversion device that displays the three-dimensional curved surface as an output image on a two-dimensional plane, a blanking area is created in advance for an area of the input image corresponding to an area in which the read address in the output image is discontinuous. An image conversion device characterized in that: is formed in advance.