JPH08129375A - Video size corrector - Google Patents

Abstract

PURPOSE: To enable automatic display of videos at the same size as in the case where the videos are displayed in a screen size which is a reference for a video source without depending on display screen sizes. CONSTITUTION: This video size corrector has a video source size detecting circuit 5 which detects the size of the videos from a video reproducing device 2, a screen size selector 6 which selects the display side of a video dispaly device 3, a size correction rate calculating circuit 7 which outputs the correction rate of the vide size in accordance with the size information from the video source size detecting circuit 5 and a screen size selector 6, and a digital zooming circuit 4 which outputs the videos from the video reperoducing device 2 to the video display device 3 by magnifying or reducing these videos in accordance with the correction rate of the video size from this size correction rate calculating circuit 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video size correction device for correcting a video size when the size of the video source is different from the size to be displayed, and more particularly, to an automatic video size correction device based on the size of the video source and the size to be displayed. The present invention relates to a video size correction device that corrects a video size.

[0002]

2. Description of the Related Art A video image reproduced by a video reproduction apparatus or the like has a different size of a subject to be displayed depending on whether it is displayed on a video display apparatus having a certain display size or when it is displayed on a video display apparatus having another display size. Is normal. For example, when the same video source is used, the 36-inch video display device displays a larger subject than the 29-inch video display device.

Therefore, in order to keep the size of the subject constant even in image display devices of different sizes, an image source is created for each size of the image display device or the same image source is used. However, it is necessary to enlarge or reduce the size of the image by other means.

[0004]

However, if an image source is created for each display size of the image display device, the number of types of image sources to be created increases, which is not realistic. Also, if the size of the image is enlarged or reduced so that the size of the subject is kept constant while using the same image source, it is possible to make a delicate size considering the size of the image source and the display size of the image display device. It will be necessary to make adjustments. In order to make this adjustment, a standard ruler or the like is displayed on the image display device, and the size is adjusted while comparing this with the actual size. Such work needs to be performed for each video display device, and
It must be done every time the image source is different.

On the other hand, the size of the image source is uniquely determined for each image source, and the display size of the image display device is physically determined for each image display device. Therefore, it is not always good practice to make the above adjustments every time.

An object of the present invention is to provide an image size correction device for enlarging or reducing the image source so as to keep the size of the subject constant for different image source sizes and different image display device sizes. Especially.

Another object of the present invention is to provide different image source sizes and different image display device sizes.
It is to keep the size of the subject constant without preparing separate video sources.

[0008]

In order to solve the above problems, a video size correction device of the present invention is a video size correction device for correcting the size of a video from a video source and displaying the video on a video display device. A correction rate for a desired video size is generated from the display size of the video source, which is a part of the video source, and the display size of the video display device, and the video source is enlarged or reduced based on the correction rate.

Another image size correcting apparatus of the present invention is an image size correcting apparatus for correcting the size of an image from an image source and displaying it on an image display device, which is recorded as a part of the image source. Display size designating means for designating a predetermined combination of the display size of the video source and the display size of the video display device, and a correction rate for the video size of the video source is generated based on information from the display size designating means. A size correction rate generating means; and a video enlarging / reducing means for enlarging or reducing the video from the video reproducing apparatus based on the video size correction rate from the size correction rate generating means and outputting the video to the video display apparatus. .

Further, in another image size correcting apparatus of the present invention, in the display size designating means, image source size detecting means for detecting a display size of the image source recorded as a part of the image source, and And a screen size selector for designating a display size of the video display device.

Further, in another image size correcting apparatus of the present invention, in the display size designating means, image source size detecting means for detecting a display size of the image source recorded as a part of the image source, and Screen size detecting means for detecting a display size of the video display device from the video display device.

Further, in another image size correcting apparatus of the present invention, in the size correction rate generating means, a correspondence table of a combination of a size of an image from the image source and a display size of the image display apparatus and the correction rate. including.

Further, in another image size correcting apparatus of the present invention, the size correction rate generating means includes an arithmetic unit for generating the correction rate from the size of the image from the image source and the display size of the image display device. Including.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a first embodiment of the image size correcting apparatus of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, a video size correction apparatus according to a first embodiment of the present invention includes a video source size detection circuit 5 for detecting the size of a video source based on a signal from a video reproduction apparatus 2, and a video display. A screen size selector 6 for selecting the display size of the device 3, a video source size detection circuit 5, and a size correction rate calculation circuit 7 for outputting a video size correction rate based on the size information from the screen size selector 6, and a size correction It has a digital zoom circuit 4 for enlarging or reducing the image from the image reproducing device 2 based on the image size correction factor from the rate calculating circuit 7 and outputting the enlarged image to the image display device 3.

The image reproducing apparatus 2 reproduces an image from a laser disk, a video tape or the like, and various kinds such as a laser disk reproducing apparatus and a video tape reproducing apparatus can be used. The image display device 3 displays the image source from the image reproduction device 2 corrected by the image size correction device 1, and various types such as a cathode ray tube type and a liquid crystal type can be used.

The digital zoom circuit 4 includes a video reproducing device 2
The image from is stored in the built-in memory for each field (described later), and only the range to be displayed is read out for enlarging or reducing. It performs the same function as that used conventionally. is there. When enlarging, specify the range to be displayed with a pointing device such as a joystick or a trackball. When the image is reduced, the center of the image is automatically aligned with the center of the display screen and displayed in the center of the screen.

The screen size selector 6 is used for the video display device 3.
It has a knob to set the display size of the screen. For example, when the display size of the video display device 3 is 32 inches, the screen size selector 6 is set to "32". The screen size selector 6 may be a slide type switch, a push button type switch, or the like.

FIG. 2 is a schematic diagram of a signal sent from the video reproduction device 2 to the video size correction device 1. The number of scanning lines for one screen in the image display device is 525, and every other line is horizontally scanned to form one screen, and then the remaining portion is scanned for the second screen. The scanning method is generally used. Regarding such a standard system, for example, "Handbook of Television Image Information Engineering, edited by The Television Society of Japan, Ohmsha Co., Ltd., issued November 30, 1990" can be referred to. In this case, 1
A screen composed of interlaced scans is called a field,
A screen that is completed by two interlaced scans is called a frame. The signal of FIG. 2 represents one field.

Referring to FIG. 2, the signal for one field is roughly divided into a video display period 22 including a video signal and a vertical blanking period 23 including vertical synchronization. The image display period 22 is a horizontal scanning period 21 corresponding to one scanning line.
Is included for 241.5 (= 525 / 2-21) scanning lines. Here, in the vertical blanking period 23, the scanning line 21
It is assumed to be equivalent to this. This horizontal scanning period 21 is
In addition to a video signal for one scanning line used for video display, a horizontal synchronizing signal which is a synchronizing signal for one scanning line is included. This synchronizing signal is for scanning at the same timing on the receiving side and the transmitting side, and in addition to the horizontal synchronizing signal mentioned here, there is a vertical synchronizing signal described later.

Referring to FIG. 3, the vertical blanking period 23
Is equivalent to 21 scan lines here, the first 3 scan lines are the first equalization pulse period 9a, the next 3 scan lines are the vertical synchronization pulse period 10, and the next scan line is Three lines are used as the second equalization pulse period 9b, and the remaining part is used as an unused scanning line period 11. Vertical sync pulse period 1
0 has a role of synchronizing the retrace line in the vertical direction, and the equalizing pulse periods 9a and 9b have a role of keeping the vertical synchronization stable.

The unused scan line period 11 is not used for transferring the original video signal. In the present invention, the image source size signal 13 is transferred during the specific horizontal scanning period 12 of the unused scanning line period 11 to notify the image size correction device 1 of the image source size.

Referring to FIG. 4, the video source size signal 13
Is a 20-bit signal in which each digit of the video source size consisting of three digits is represented by a 4-bit decimal evolution binary number (BCD), and a 4-bit header and footer are added before and after the digit. The header and the footer respectively indicate the beginning and the end of the signal, and thereby recognize that the video source size signal 13 is obtained in any horizontal scanning period 12 within the unused scanning line period 11. be able to.

When the video source size detection circuit 5 detects the header recorded in the vertical blanking period 23 of the video signal, the video source size is read until the footer is detected, and the video source size is corrected. Output to the rate calculation circuit 7.

Referring to FIG. 5, the size correction rate calculation circuit 7 stores a correction rate conversion table in a ROM or the like, and uses the combination of the image source size detection circuit 5 and the display size instructed by the screen size selector 6. The correction rate of the screen size, that is, the magnification of enlargement or reduction is acquired.

Here, the correction factor conversion table is accessed as follows. In the correction factor conversion table, assuming that the combination of the image source size and the screen size is regularly arranged as shown in FIG. 5, the value indicated by the image source size detection circuit 5 is a,
If the value designated by the screen size selector 6 is b and the number of screen size types is B, the entry number C of the correction factor conversion table is shown.
Is expressed by the following equation.

C = B × a + b where B is “4” and a and b are 36
Indicate "0" for inches, "1" for 32 inches, "2" for 29 inches, and "3" for 27 inches. Further, C is “0”, “in order from the top in FIG.
Values such as 1 "and" 2 "are taken.

For example, when the image source size is 36 inches and the display size of the image display device is 32 inches,
Since a = “0” and b = “1”, C = 4 × 0 +
1 = 1, and it can be seen that the correction factor is + 11.1%, that is, the image source is multiplied by 1.111 by referring to the second correction factor from the correction factor conversion table.

The correction factor thus obtained is output to the digital zoom circuit 4 and used for enlarging or reducing the image.

Note that the size correction rate calculation circuit 7 does not have a correction rate conversion table, and calculates the display size instructed by the video source size detection circuit 5 and the screen size selector 6 by a calculation unit or the like. The correction factor may be obtained.

As described above, according to the image size correction apparatus 1 which is the first embodiment of the present invention, the screen size selector 6
The display size of the image display device 3 is set in advance, the image source size detection circuit 5 detects the image source size from the signal from the image reproduction device 2, and the size correction factor calculation circuit 7 automatically determines the correction factor. By acquiring, the enlargement or reduction in the digital zoom circuit 4 is automatically performed.

Next, a second embodiment of the image size correction apparatus of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 6, in the image size correction apparatus according to the second embodiment of the present invention, the screen size selector 6 of the first embodiment is replaced with a screen size detection circuit 16, and this screen size detection circuit 16 is replaced. In the above, the display size of the video display device 3 is detected by the signal from the video display device 3.

The image display device 3 has means for storing the display size. For example, the display size can be changed by the screen size selector 6 using a plurality of DIP switches.
Similarly, for example, "0" for 36 inches, "1" for 32 inches, "2" for 29 inches, "3" for 27 inches, etc. are set.

The screen size detection circuit 16 detects the display size of the video display device 3 and notifies the size correction rate calculation circuit 7 of this. Similar to the first embodiment, the size correction rate calculation circuit 7 stores the correction rate conversion table in the ROM or the like, and the video source size detection circuit 5 and the screen size detection circuit 1 are stored.
The correction ratio of the screen size, that is, the enlargement or reduction ratio is obtained by the combination of the display sizes designated by 6. As a result, the digital zoom circuit 4 holds the image from the image reproducing apparatus 2 in the built-in memory for each field and enlarges or reduces it, as in the first embodiment, and the image is displayed on the image display apparatus 3. Is displayed.

As described above, according to the video size correction apparatus 1 of the second embodiment of the present invention, the screen size detection circuit 16 detects the display size of the video display apparatus 3 as compared with the first embodiment. By doing so, the video display device 3
It becomes unnecessary to set the display size of
The display size is automatically adjusted when the video display device 3 is replaced.

[0037]

As is apparent from the above description, according to the present invention, the image size correction rate is automatically obtained from the image source size and the screen size, and the image is automatically enlarged or reduced. Be seen. With this, it is possible to maintain the same size of the subject for the video display devices having different display sizes by the same video source.

Further, since it suffices to select the display size from the predetermined values, the operability is improved without the need of finely adjusting the image size.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a first embodiment of an image size correction device of the present invention.

FIG. 2 is a diagram showing a structure of a field signal in the image size correction apparatus according to the embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a vertical blanking period of a field signal in the image size correction apparatus according to the exemplary embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a video source size signal in the video size correcting apparatus according to the first embodiment of the present invention.

FIG. 5 is a diagram showing a correction rate conversion table of a size correction rate calculation circuit in the image size correction apparatus of the present invention.

FIG. 6 is a block diagram showing the configuration of a second embodiment of the image size correction device of the present invention.

[Explanation of symbols]

 1 video size correction device 2 video playback device 3 video display device 4 digital zoom circuit 5 video source size detection circuit 6 screen size selector 9a, 9b equalization pulse period 10 vertical sync pulse period 11 unused scan line period 12 horizontal scan period 13 video Source size signal 16 Screen size selector 20 Field signal 21 Horizontal scanning period 22 Video display period 23 Vertical blanking period

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ko Kusakabe 1-28-3 Mita, Minato-ku, Tokyo NEC Information Service Co., Ltd.

Claims (6)

[Claims] 1. A video size correction device for correcting the size of a video image from a video source and displaying the video image on a video display device, the display size of the video source being a part of the video source, and the display size of the video display device. An image size correction device, which generates a correction factor for a desired image size from the above, and enlarges or reduces the image source based on the correction factor. 2. A video size correction device for correcting the size of a video image from a video source and displaying the video image on a video display device, wherein the display size of the video source recorded as a part of the video source and the display size of the video display device. Display size designating means for designating a predetermined combination with the display size, size correction rate generating means for generating a correction rate for the video size of the video source based on information from the display size designating means, and the size correction rate An image size correction device, comprising: an image enlargement / reduction device for enlarging or reducing an image from the image reproduction device based on a correction ratio of the image size from the generation device and outputting the enlarged image to the image display device. 3. The display size designating means is a video source size detecting means for detecting a display size of the video source recorded as a part of the video source, and a screen size for designating a display size of the video display device. The image size correction device according to claim 2, further comprising a selector. 4. The display size designation means is a video source size detection means for detecting a display size of the video source recorded as a part of the video source, and a display of the video display device from the video display device. The image size correction apparatus according to claim 2, further comprising a screen size detection unit that detects a size. 5. The size correction factor generating means includes a correspondence table of a combination of the size of the image from the image source and the display size of the image display device and the correction factor. 4. The image size correction device described in 4. 6. The size correction rate generating means includes an arithmetic unit for generating the correction rate from the size of the image from the image source and the display size of the image display device. The image size correction device described.