JP2000081867A - Video output device and control method for video output - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a video output device and a control method for video output which can display the whole screen in a video display device while keeping a print-outputtable state of the whole screen in a video printing device. SOLUTION: When an operator gives an instruction for picture output by performing setting of under scan 80%, a CPU sets a data write-in region of VRAM 14 in accordance with under scan 80%. When a video display device is not set to over scan and 640×480 dots can be displayed on the whole screen, [64, 48] is set as a write-in start coordinate of the VRAM 14 and [575, 431] are set as write-in finish coordinates. The CPU reads out picture data from a storage medium, and reduces or expands a picture so that read out picture data is settled to a display region in the set VRAM 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a video output device for outputting a video signal based on image data and a video output control method for controlling an output range when outputting a video signal.

[0002]

2. Description of the Related Art A video display device such as a television receiver does not display an entire image based on an input video signal but overscans so that an area of about 85% of the video is displayed in a screen frame. Is set to Therefore,
When an image or the like captured by a digital still camera having a video signal output function is output to such a video display device, part of the image is not displayed on the video display device.

On the other hand, an image printing apparatus such as a video printer can generally print all images based on an input image signal. Then, based on a video signal output from a video output device such as a digital still camera, a video printer or the like can print all images, while a video display device such as a television receiver displays a partially missing image. Will be. Therefore, when an image is first displayed on the video display device to check the contents, and thereafter the printout is performed, the details of the display and the printout are different, giving a sense of incongruity to the operator.

[0004]

As described above, since a general video display device is set to overscan, an image based on a video signal such as an NTSC signal, a PAL signal, or a YC signal output from a video output device is output. However, there is a problem that the function of the video output device cannot be fully utilized. That is, when the user wants to display the entire screen on the video display device set to overscan, the video display device must change the horizontal size and the vertical size (change the raster scan setting), which is troublesome. It is. Further, as described above, since the entire screen can be printed out on a video printer or the like, there is a problem that the operator may feel uncomfortable.

An object of the present invention is to solve such a problem, and an image output apparatus capable of displaying an entire screen on an image display device while maintaining a printable state of the entire screen in the image printing apparatus. It is an object to provide an apparatus and a video output control method.

[0006]

The video output device according to the present invention is characterized by comprising output range changing means for variably setting the video output range.

The video output device includes video output means for converting data in the VRAM into a video signal. The output range changing means includes a display area setting means for setting a display area in the VRAM, and image data in the display area. The configuration may include data setting means for setting.

[0008] The output range changing means may include a conversion means for performing a coordinate conversion process of the image data so that the image falls within the display area of the VRAM. Further, the display area setting means may be configured to set the display area according to the setting or the occurrence of an event.

A video output control method according to the present invention is characterized in that a display area in a VRAM is set according to a setting or occurrence of an event, and input image data is set in the display area. When the image data is set in the display area of the VRAM, the coordinate conversion processing of the image data may be performed so that the image fits in the display area.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a video output device 1 according to the present invention, together with a video display device 2 and a video printing device 3. As shown in FIG. 1, a video output device 1 includes a CPU 11, a RAM 12 serving as a work area, a storage medium reading unit 13 for reading storage contents of a storage medium such as a smart media and an FD, and a VRA for expanding image data.
M14, a video output circuit 15 for converting data in the VRAM 14 into a video signal, and an operation unit 16 are provided.
These blocks are connected by a bus.

The video output circuit 15 is connected to a video output terminal. The video output terminal is connected to, for example, a video display device 2 such as a television receiver or a video printing device 3 such as a video printer. Note that the video display device 2 may be integrated with the video output device 1 in some cases. In such a device as well, a television receiver can be connected to the video output terminal in addition to the video printing device 3.

Next, the operation will be described with reference to the explanatory diagram of FIG. 2 and the flowchart of FIG. The video output device 1 converts image data stored in a storage medium into a VR.
When the image is developed on the AM 14, the image data development area in the VRAM 14 is set and the original image is reduced or enlarged in accordance with the instruction input to the operation unit 16.

When displaying an image on the video display device 2, an operator sets an underscan instruction on the operation unit 16. Here, the display area percentage can also be set. For example, it is assumed that the operator has performed an image output instruction by performing underscan and 80% settings. Then, the CPU 11 sets the underscan, 80%
The data write area of the VRAM 14 is set in accordance with. Assuming that 640 × 480 dots can be displayed on the entire screen when the video display device 2 is not set to overscan, [64, 48] is set as the writing start coordinate of the VRAM 14 and [64, 48] is set as the writing end coordinate. 575, 431] (steps S11 and S1).
2).

Next, the CPU 11 reads out the image data from the storage medium and stores it in the RAM 12 (step S).
14). Then, the image is reduced or enlarged so that the read image data fits in the set display area (the area between the writing start coordinates and the writing end coordinates) in the VRAM 14 (step S15).

When reducing or enlarging, the CPU 11
First, the ratios xj and yj between the original image data and the display area are determined. For example, if the original image data is 1024 × 768 dots, xj = [1024/512 (= 640 × 80%)] yj = [768/384 (= 480 × 80%)].

Then, using the obtained ratios xj and yj,
Original image data to be set at each coordinate of the VRAM 14 is obtained. Let the coordinates of each pixel in the original image data be (xp,
yp), the coordinates in the VRAM 14 are (xv, yv),
Assuming that the writing start coordinates of the VRAM 14 are (xs, ys), xv = (xp / xj) + xs (1) yv = (yp / yj) + ys (2)

In the example shown in FIG. 2, xs = 64, ys
= 48. The CPU 11 selects (xp, yp) original image data that satisfies the equations (1) and (2) for each coordinate of the display area in the VRAM 14. If there is no (xp, yp) satisfying the equation, the closest (xp, yp) original image data is selected.

The number of dots of the original image is 1024 × 768 or 3
640 × when the aspect ratio is 4: 3 like 20 × 240
Although an image similar to the original image is set in the display area of the VRAM 14 of 480, if the aspect ratio is not 4: 3, the expression (1) and (2) may not be applied to the original image. Similar images are not set. Therefore, in such a case, the following processing is performed to set an image similar to the original image in the display area of the VRAM 14.

For example, as shown in FIG. 4A, when the original image is horizontally long with respect to the display area, that is, (xd /
4) In the case of> (yd / 3), it is necessary to find the number of dots in the y direction based on the number of dots in the x direction. Here, xd is the total number of dots in the x direction (horizontal direction) of the original image, y
d is the total number of dots in the y direction (vertical direction) of the original image. In a display area having an aspect ratio of 4: 3, the number of dots in the y direction based on the number of dots in the x direction is yd ′ = (xd / 4) × 3.

Then, equations (1) and (2) are applied to the following image data. When yp is 0 to (yd'-yd) / 2: blank data (white or black) yp is (yd'-yd) / 2 to yd + (yd'-yd)
/ 2 When the y-coordinate of the original image is (yp- (yd'-
When the data yp of yd) / 2 is yd + (yd'-yd) / 2 to yd ...
Blank data (white or black)

By the above-described processing, an image in which the upper and lower portions are blank is set in the VRAM 14 as shown in FIG. If (xd / 4) <(yd / 3), then xp and xd may be used instead of yp and yd in the processing described above. As a result, as shown in FIG.
Are set in the VRAM 14.

Further, the CPU 11 writes the selected image data as digital RGB data at each coordinate in the display area of the VRAM 14 (step S1).
6). When the processes of steps S15 and S16 have been executed for all coordinates, the process ends (step S17). As described above, the display area of the size corresponding to the instruction from the operation unit 16 is set, and the entire screen of the image data stored in the storage medium is reduced or enlarged so as to fit in the set display area. Is written to the VRAM 14.

The operator sets a normal scan instruction on the operation unit 16 when printing an image with the video printing apparatus 3. Then, the CPU 11 assumes that the image printing device 3 can print at, for example, 640 × 480 dots.
[0, 0] is set as the write start coordinate of the VRAM 14, and [639, 479] is set as the write end coordinate (steps S11, S13).

Thereafter, the image data is read from the storage medium (step S14). The read image is 640 × 48
If it is not 0 dot, the image is reduced or enlarged (step S15), and the image data is set in the display area of the VRAM 14 (640 × 480 in this case).

Also in this case, (xd / 4) ≠ (yd / 3)
In the case of (1), by performing the processing described above, the image data with
It is set to 14.

The video output circuit 15 converts digital RGB data set in the VRAM 14 into analog RGB data.
The signal is converted into a signal, and a necessary horizontal synchronization signal and vertical synchronization signal are added to generate a video signal. Then, the video signal is output to the video output terminal. With the above processing, when the video display device 2 is connected to the video output terminal, for example, even if the video display device 2 is set to overscan to display 85% of the image, The entire screen of the stored image is displayed on the video display device 2. Also, the video printing terminal 3 is connected to the video output terminal.
Is connected, the entire screen of the image stored in the storage medium is printed out by the video printing device 3.

As described above, in this embodiment, the image data stored in the storage medium is set in the display area of the VRAM 14 according to the instruction from the operation unit 16. At this time, if the sizes of the original image data and the display area of the VRAM 14 do not match, the image size is adjusted. Therefore, even when an image is displayed on the video display device 2 set to normal overscan, the entire screen of the original image can be displayed on the video display device 2. Further, as in the conventional case, the image printing device 3 prints out the entire screen.

Therefore, when the entire screen of the original image data is displayed on the video display device 2 such as a television receiver, it is not necessary to change the raster scan setting in the video display device, and the entire original image can be displayed without any operation. The screen can be displayed on the video display device 2. Further, since image size conversion is performed when setting image data in the VRAM 14 so that the entire screen of the original image is displayed, the entire screen is displayed on the video display device 2 without changing the video output frequency. be able to.

In this embodiment, whether or not to perform the underscan and the percentage are set on the operation unit 16. However, when an event of "print output" occurs, the scan setting is set to the normal state, and the "display output" is set. When the event (1) occurs, the scan setting may be set to underscan. These events occur, for example, due to switch settings provided on the operation unit 16.

[0030]

As described above, according to the present invention, the video output device is provided with the output range variable means for variably setting the video output range, so that the entire screen can be printed out in the video printing device. There is an effect that the entire screen can be displayed on the video display device while maintaining the state.

In the case where the output range changing means is configured to include a display area setting means for setting a display area in the VRAM and a data setting means for setting image data in the display area, the image display device In this method, the entire screen of the original image can be displayed on the video display device without any operation without changing the raster scan setting.

When the output range changing means is configured to include a conversion means for performing coordinate conversion processing of image data so that an image falls within the display area of the VRAM, the video output frequency is not changed. The entire screen can be displayed on the video display device. If the display area setting means is configured to set the display area according to the setting or the occurrence of an event, the full screen is printed out or displayed according to the setting of the operator or automatically. Or you can.

According to the present invention, the image output control method is configured to set the display area in the VRAM according to the setting or the occurrence of an event, and to set the input image data in the display area. It is possible to display the full screen on the video display device while maintaining the printable state of the entire screen in the device. When the image data is set in the display area in the VRAM, if the coordinate conversion processing of the image data is performed so that the image fits in the display area, the raster scan setting in the video display device may be changed or the video output may be changed. The entire screen can be displayed on the video display device without changing the frequency.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a video output device according to the present invention, together with a video display device and a video printing device.

FIG. 2 is an explanatory diagram showing an area and a video display area in a VRAM.

FIG. 3 is a flowchart illustrating a process of setting image data to a VRAM in the video output device.

FIG. 4 is an explanatory diagram for explaining a conversion process when (xd / 4) ≠ (yd / 3).

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 video output device 2 video display device 3 video printing device 11 CPU 12 RAM 13 storage medium reading unit 14 VRAM 15 video output circuit 16 operation unit

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09G 5/373 G09G 5/36 520E H04N 5/93 H04N 9/87 Z 9/87 5/93 Z F term (Ref.)

Claims (6)

[Claims] 1. A video output device for outputting a video signal, comprising: output range changing means for variably setting a video output range. 2. A video output means for converting data in the VRAM into a video signal, wherein the output range changing means sets a display area in the VRAM, and sets image data in the display area. The video output device according to claim 1, further comprising data setting means. 3. The video output device according to claim 2, wherein the output range changing unit includes a conversion unit that performs a coordinate conversion process of the image data so that the image falls within a display area of the VRAM. 4. The video output device according to claim 2, wherein the display area setting means sets the display area in accordance with the setting or the occurrence of an event. 5. A video output control method in a video output device for outputting data in a VRAM as a video signal, comprising: setting a display area in a VRAM according to a setting or occurrence of an event; A video output control method characterized by setting: 6. The video output control method according to claim 5, wherein, when setting the image data in the display area of the VRAM, a coordinate conversion process of the image data is performed so that the image fits in the display area.