JPS60189786A - Image display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to inputting an image signal based on pixel data stored in an image memory into a display means such as a cathode ray tube display device (hereinafter referred to as CRT) and displaying the image signal. The present invention relates to an image display device.

[Technical Background of the Invention] Conventionally, image display devices that display natural color (color) images have been used to display natural color (color) images.
The pixel data of B) is stored in an image memory for each color, and a gradation control section is provided corresponding to each image memory, and a conversion formula or conversion table (hereinafter referred to as a lookup table) is written in the gradation control section. The gradation of the digital image signal based on each pixel data in the image memory is converted to the desired gradation according to the table (referred to as a table), and this gradation-controlled digital image signal is converted into an analog signal and then input to the CRT. There are known devices that display images using

By the way, in the conventional image display device as described above, if the image displayable area of the CRT is smaller than the area corresponding to one frame display in the image signal (in the case of zoom display, one frame display (including cases where the equivalent area is equal to or larger than the equivalent area), a partial area corresponding to the image displayable area of the CRT is arbitrarily selected from the area equivalent to one frame display in the pixel data stored in the image memory in the previous stage of the image memory. Image display is carried out by a method in which a scrolling device is provided to display one frame of the image for each partial image.

[Problems in the Background Art] However, in the conventional image display device as described above, in order to confirm which area in the image memory is displayed on the display screen, it is necessary to decode the display contents. Therefore, it was difficult to immediately determine which department in one frame was being displayed.

In addition, if the image is no longer displayed on the display screen while moving the display area using the scroll device, check whether the area was specified inappropriately or if the pixel data was originally in the specified partial area. It was nearly impossible to immediately determine whether the system had been overloaded or not, leading to a decline in operability.

[Object of the Invention] The present invention has been made to solve the problems of the conventional art.When the image displayable area of the display means is smaller than the display equivalent area of the image signal, the displayed partial area is It is an object of the present invention to provide an image display device with excellent operability, which can instantly determine which part of a signal it is.

[Summary of the Invention] That is, the image display device of the present invention is an image display device configured to select a partial region from an area corresponding to one frame display in an image signal and display it on a display means as a partial image. The display device is characterized in that the relative positional relationship between the partial area and the area corresponding to one frame display is displayed by an index on a display means.

[Embodiment of the Invention] Details of the present invention will be described below based on an embodiment shown in the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

In the figure, reference numerals 101 to 103 refer to photoelectric conversion means, for example, image display control after a video input signal from a TV camera (not shown) or a display instruction signal for graphic display by a computer is converted into a digital signal for each color. 2 shows an image memory into which pixel data is written while being controlled by unit 2.

In the case of this embodiment, the maximum storage capacity of the image memories 101 to 103 is equivalent to displaying one frame of image.

Reference numeral 3 indicates a display area address signal generation unit that generates a signal to display the entire area of pixel data and specify the address of the desired partial area when displaying an image using the pixel data written in the image memories 101 to 103. Department, code 4
indicates a display area address signal variable section that changes the address of a partial area to be displayed using a trackball, joystick, arrow keys, or the like.

The functions of the display area address signal generating section 3 and the display area address signal variable section 4 are the same as those conventionally called a scroll device.

The symbol @5 indicates a symbol display signal generation section. This symbol display signal generating section 5 will be described later.

Further, reference numerals 601 to 603 control the gradation of the digital image signal based on the pixel data written in the image memories 101 to 103, and store a lookup table for displaying the image at a predetermined density. It shows.

Writing of the lookup table into the gradation control units 601 to 603 is performed by the image display control unit 2 described above, but this lookup table write signal line is omitted in FIG.

Further, reference numerals 701 to 703 indicate gradation control units 601 to 603.
Signal synthesis section 801 to 803 that synthesizes the output signal from the display area address signal generation section 5 and the output signal from the display area address signal generation section 5
Reference numeral 9 indicates a D/A converter that converts the digital signals outputted from the signal synthesizing sections 701 to 703 into analog signals, and 9 indicates a CRT having an image displayable area smaller than the entire area of the image memory described above.

The symbol display signal generating section 5 will be explained below with reference to FIGS. 2 and 3 of C1.

FIG. 2 is a diagram conceptually showing the recording state of pixel data in the image memories 101 to 103.

The pixel data in the image memories 101 to 103 are arranged in M pieces in the X direction and N pieces in the Y direction, and these pixel data generate a digital image signal corresponding to one frame of the image to be displayed.

Note that memory cells several bits long are usually allocated to store image information corresponding to one dot of an image to be displayed, so each pixel data in Figure 2 is allocated to a memory cell several bits long. It indicates a group.

In addition, the total amount of pixel data written to the image memory tdD
The partial area d inside corresponds to the image displayable area of the CRT 9 mentioned above. The partial area d is a display area address signal generator 3 controlled by a display area address signal variable unit 4.
It is determined by the address signal generated from the address signal, and movement can be specified arbitrarily within the entire area.

The symbol display signal generator 5 generates, for example, a signal for displaying an index as a means for expressing the relative position of the partial area d with respect to the entire area, and the generated symbol display signal is used together with the output signals of the gradation control units 601 to 603. Signal synthesis section 701
~703, synthesized, and D/A converter 801~
At step 803, the signal is converted into an analog signal and input to the CRT 9, and the index is displayed on the display screen together with the image (so-called superimposed format). Although not shown, a changeover switch is provided as necessary so that the symbol display signal may not be input to the signal synthesis sections 701 to 703.

FIG. 3 is a diagram specifically showing the display state of the screen of the CRT 9. As shown in FIG.

A frame symbol 11 indicating the entire area of the image memory is located at a position that does not obstruct the visual view of the image displayed on the display surface 10 (bottom right in the figure), and a frame symbol 11 that can be moved arbitrarily within and around this frame symbol 11 Frame symbol 11a indicating partial area d
is displayed.

The symbol display signal generator 5 generates such a frame symbol 11.
．． 11b is generated.

According to the image display device of the present invention configured as described above, the partial area d is specified from the entire area of pixel data stored in the image memories 101 to 1.3, and the partial image is displayed on the CRT 9. In the case of displaying, the display area address signal generating section 3 outputs a display area address signal specifying a display area to the image memories 101 to 103, and a corresponding symbol display control signal is output to the symbol display signal generating section 5. Enter.

Then, the symbol display signal is outputted from the symbol display signal generating section 5 to the signal synthesizing sections 701 to 703 and 111w4 control section 6
The combined digital signal is combined with the image signal output 2 from the D/A converters 801 to 80.
After being converted into an analog signal in step 3, it is input to the CRT 9, and a frame symbol 11 indicating an area corresponding to one frame display and a frame symbol 11a indicating the partial area are displayed on the display surface 10 of the CRT 9 together with the partial image.

In this way, the frame symbol 11a moves according to the position of the specified partial area, and the position of the partial area in the area corresponding to one frame display can be visually confirmed.
It is possible to easily know which part of the frame image is being displayed.

Note that the image display device of the present invention should not be limited to one embodiment as described above.

In the embodiment described above, a digital image signal based on pixel data stored in an image memory is used as the original image signal, but a digital image signal output from another device, such as a signal receiving device of a digital TV receiver, etc. It is also possible to consider a method in which the signal is treated directly as the original signal.

In other words, if the digital image signal has a group of frames and it is possible to specify a partial area to be displayed within the image signal, the symbol display signal generation unit 5 generates a symbol display signal corresponding to the partial area. The present invention can be put into practice by doing so.

As the image display means, various display means such as not only a CRT but also an image printing device, a FAX, a liquid crystal display device, etc. can be adopted.

Further, in the embodiment described above, the symbol indicating the area is inserted and displayed on the image display surface, but a display means exclusively for displaying the symbol may be provided separately from the image display surface.

Furthermore, in the above embodiment, ii! ii. The case where the image signal is a digital color signal has been explained, but as mentioned earlier, if it is possible to specify the area corresponding to one frame display and the partial area to be displayed, the image signal can be an analog color signal. Even if there is, it can be implemented by displaying similar indicators. Further, it is provided with only one processing system. Even in a monochrome image display device, the present invention can be implemented by converting the three systems for each color in the above-described embodiment into one system.

[Effects of the Invention] As explained above, in the device of the present invention, the image displayable area of the image display means is smaller than the area corresponding to one frame display included in the image signal (when performing zoom display). ), even if the image must be displayed for each partial area, a symbol is displayed on the display means that allows the relative position of the displayed partial area and the area equivalent to one frame display to be visually confirmed. Therefore, it is possible to immediately know which partial area of the area corresponding to one frame display in the image signal the displayed partial area is.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the device of the present invention, FIG. 2 is a conceptual diagram showing the pixel data area of the image memory in an embodiment of the device of the present invention, and FIG. 3 is an embodiment of the device of the present invention. It is a front view showing the display state of area display symbols in an example. 101 to 103... Image memory 2... Image display control section 3...
...Display area address signal generation section 4...
......Display area address signal variable section 5...
...... Symbol display signal generation section 601 to 60
3... Gradation control section 701-703... Signal synthesis section 801-803... D/A conversion section 9... CRT Representative Patent Attorney Sasa Suyama - Figure 2 Figure 3

Claims (11)

[Claims] (1) In an image display device configured to display a partial area signal from a display equivalent area signal in an image signal as a partial image, the relative positional relationship between the displayed partial area signal and the display equivalent area signal is An image display device configured to display . (2) The image display device according to claim 1, wherein the relative positional relationship between the partial area signal and the display equivalent area signal is displayed using an index. (3) The first index indicates the area corresponding to one frame display.
3. The image display device according to claim 2, comprising a frame-shaped symbol and a second frame-shaped symbol that indicates a partial area and is movable relative to the first frame-shaped symbol. (4) The image display device according to claim 3, wherein the indicator is configured to be displayed together with the image on the same display surface of the display means. (5) The image display device according to claim 3, wherein the indicator is configured to be displayed on another display means independent of the display means. (6) The image display device according to claim 1, wherein the image signal is a digital signal. (7) The image display device according to claim 1, wherein the image signal is a color image signal. (8) The image display device according to claim 1, wherein the display means is a cathode ray tube display device. (9) A configuration for displaying an image, the configuration includes a scroll unit that arbitrarily specifies a partial area from the area corresponding to one frame display in the image signal, and generates symbol display signals of the first and second frame symbols. a symbol display signal generating section that synthesizes the image signal corresponding to the partial area specified by the scroll section and the symbol display signal; 4. The image display device according to claim 3, comprising: a cathode ray tube display device for displaying the first and second frame-shaped symbols; and an image display control section for controlling these. (10) The image display device according to claim 9, wherein the image signal is generated by pixel data stored in an image memory. (11) The image display device according to claim 10, wherein the partial area is specified by addressing pixel data stored in the image memory.