JPH0865595A - Image processor, image processing method and television receiver - Google Patents

Abstract

PURPOSE: To attain display reduced in its unnatural sense in the case of displaying a video signal with a 4:3 standard aspect ratio on a display screen with a 16:9 wide aspect ratio. CONSTITUTION: Video signals inputted as analog signals are quantized by A/D converters 1R, 1G, 1B and converted into digital signals. Respective frame memories 2R, 2G, 2B store the video signals converted into digital signals through respective A/D convertes 1R, 1G, 1B. Arithmetic circuits 3R, 3G, 3B integrate data for two horizontal scanning lines read out from the data stored in the memories 2R, 2G, 2B with respective interpolation coefficients generated from a coefficient generator 5, align bit length by addition and output the integrated data to respective D/A converters 7R, 7G, 7B as new scanning line data. The D/A converters 7R, 7G, 7B respectively convert digital signals sent from the circuits 3R, 3G, 3B into analog signals and output the analog signals to a display device as video signals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing apparatus, an image processing method and a television receiver used when displaying a 4: 3 standard aspect video signal on a 16: 9 wide aspect display screen. It is a thing.

[0002]

2. Description of the Related Art Television receivers having a 16: 9 wide aspect display screen have been implemented. In the case of displaying a 4: 3 standard aspect video signal in such a receiver, the display is conventionally performed as shown in FIG. 3, for example. That is, A in the figure forms a non-display portion at the left and right ends of the display screen. Further, B in the same figure is enlarged and displayed so that the horizontal width of the display of the video signal matches the horizontal width of the display screen.

However, in these methods, in A, a non-display portion is formed at the left and right edges of the display screen, and such a non-display portion interferes with viewing. Further, in B, the upper and lower sides of the display of the video signal are cut off and cannot be seen, so that all of what is expressed in the video signal cannot be viewed correctly.

Further, as shown in C of the same figure, the display of the video signal is extended in the horizontal direction so that the horizontal width and the vertical width of the display of the video signal match the horizontal width and the vertical width of the display screen. Things are also being done. However, with this method, the entire display of the video signal appears to be crushed in the vertical direction, resulting in an extremely unnatural display.

On the other hand, it has been proposed to perform a display as shown in FIG. That is, in this case, as shown in the conceptual diagram of B of the same figure, only the vicinity of the left and right ends of the display of the video signal is stretched. According to this, a natural display is performed at the center of the display screen, and the visual recognition power is weakened in the vicinity of the left and right ends when looking at the center portion, so that an unnatural feeling is less likely to occur.

However, when the display contents of the video signal are moved in the left and right direction while performing such a display,
Since the speed of the movement becomes uneven, it becomes very unnatural when the movement is followed with eyes. That is, when such a display is made, there is little unnatural feeling when the viewpoint position is fixed, but when the viewpoint moves to the left and right, it becomes extremely unnatural.

By the way, when the movement of the viewpoint of the video signal is investigated in general television broadcasting, for example, as shown in the table of FIG. It was found that it was extremely small at 2 to 1/5 or less.

Therefore, the applicant of the present application has previously made it possible to prevent the above-mentioned unnaturalness from being felt when displaying a video signal having a standard aspect ratio of 4: 3 on a display screen having a wide aspect ratio of 16: 9. We proposed a receiver (Japanese Patent Application No. 5-155659).

That is, in this prior application, in displaying a 4: 3 standard aspect video signal on a 16: 9 wide aspect display screen, the horizontal width of the display of the video signal is substantially equal to the horizontal width of the display screen. And let
At least one of the vicinity of the upper and lower ends of the display of the video signal is vertically compressed so that the vertical width of the display of the video signal substantially matches the vertical width of the display screen.

According to this, at least one of the vicinity of the upper and lower ends of the display of the video signal is vertically compressed so that the vertical width of the display of the video signal substantially matches the vertical width of the display screen. As a whole, it is possible to perform display with less unnatural feeling.

Therefore, in this prior application, as shown in FIG. 6A, the horizontal width of the display of the video signal is substantially matched with the horizontal width of the display screen. At the same time, at least one of the vicinity of the upper and lower ends of the display of the video signal is compressed in the vertical direction so that the vertical width of the display of the video signal substantially matches the vertical width of the display screen. That is, in this case, as shown in the conceptual diagram in B of the same figure, only the vicinity of the upper and lower ends of the display of the video signal is compressed.

According to this, a natural display is performed in the center of the display screen, and, as described above, the vertical movement of the viewpoint of the video signal is small, so that the movement does not give an unnatural feeling. .

Further, in order to realize such a display, for example, a configuration as shown in FIG. 7 is used. That is, in FIG. 7, reference numeral 71 is a vertical deflection drive signal generation circuit. The generating circuit 71 has a vertical synchronizing signal Vs.
Is supplied, and arbitrary waveform data is supplied from the waveform memory 72 to generate a vertical deflection drive signal Vd.

A drive signal from the generating circuit 71 is supplied to one end of a vertical deflection yoke 75 through a resistor 73 and an output amplifier 74. The other end of the deflection yoke 75 is grounded through the resistor 76. The signal obtained at the connection point of the resistor 76 is output to the output amplifier 74 through the resistor 77.
Be returned to.

Therefore, in this device, in the normal display, the waveform memory 72 generates the drive signal Vd as shown in FIG. As a result, a deflection current Iy as shown by B in the figure is passed through the deflection yoke 75, and a display having normal vertical linearity is performed. The above-mentioned display in FIGS. 3 and 4 is also performed by this drive signal Vd.

On the other hand, a mode switching signal is supplied to the waveform memory 72 to change the waveform data, for example, C in FIG.
The drive signal Vd as shown in is generated. As a result, a deflection current Iy as shown by D in the same figure is made to flow, and at least one of the vicinity of the upper and lower ends as shown in FIG. 6 is vertically compressed for display.

That is, in this apparatus, means (waveform memory 72) for changing the waveform of the signal for correcting the vertical linearity of the display screen is provided, and by changing the waveform, the vertical linearity of the display screen is made near the upper and lower ends. At least one of the above is reduced, and at least one of the vicinity of the upper and lower ends of the display of the video signal is vertically compressed so that the vertical width of the display of the video signal substantially matches the vertical width of the display screen.

According to the above apparatus, at least one of the vicinity of the upper and lower ends of the display of the video signal is vertically compressed so that the vertical width of the display of the video signal substantially matches the vertical width of the display screen. As a result, it is possible to perform display with less unnatural feeling as a whole.

That is, in the above-mentioned device, since the linearity of the display screen in the horizontal direction is normally maintained, an unnatural feeling does not occur even if the viewpoint moves in the horizontal direction. On the other hand, since the movement in the vertical direction is performed very few times as described above, there is little opportunity to feel unnaturalness.

Further, since the video signal is displayed on the entire display screen and is normally displayed in the central portion of the screen, there is little unnaturalness. Note that, in general, natural images often have left-right symmetry but few vertical symmetry, so that even if the vertical linearity is distorted, unnaturalness is rarely felt. Further, the linear distortion required to make the vertical width of the above-mentioned video signal display substantially equal to the vertical width of the display screen is about 10% or more, which is a level that is allowed in a television receiver in the early stage of television broadcasting. Is.

Further, the vertical tube surface curvature of a general cathode ray tube is larger than that in the horizontal direction.
A 6: 9 wide aspect cathode ray tube has a larger vertical tube surface curvature than a 4: 3 standard aspect cathode ray tube. On the other hand, the above-mentioned change of vertical linearity visually appears as if the curvature in the vertical direction is made small, and these are offset to further reduce visual unnaturalness.

FIG. 9 shows another example of the configuration used to realize the above display. In FIG. 9,
A vertical cycle sawtooth wave as shown in the figure is supplied to one input of the error amplifier 82 through the resistor 81. The signal from the output of the error amplifier 82 is supplied to the output amplifier 84 through the resistor 83. And this output amplifier 84
Is supplied to one end of the vertical deflection yoke 85.

Further, the other end of the vertical deflection yoke 85 is grounded through a capacitor 86 and a resistor 87. As a result, a parabola wave having a vertical period as shown in the figure is obtained at one end of the vertical deflection yoke 85. This signal is resistor 8
Error amplifier 8 through 8, capacitor 89 and resistor 90
It is fed back to the other input of 2. Further, a sawtooth wave having a vertical cycle as shown in the figure is obtained at the connection midpoint of the capacitor 86 and the resistor 87. This signal is fed back to the other input of the error amplifier 82 through the resistor 91.

In this device, a signal having a correction waveform with a vertical cycle as shown in the figure is supplied to the other input of the error amplifier 82 through the resistor 92. This also changes the linearity in the vertical direction similar to that shown in FIG.

Further, in the above-mentioned device, the change of the linearity in the vertical direction is not only performed symmetrically in the vertical direction but, for example, when the upper half of the body of the person is displayed, the change amount on the upper end side corresponding to the face The number may be reduced and more may be performed on the lower end side. Further, these change amounts may be arbitrarily selected. Further, by using the change of the linearity in the horizontal direction as described with reference to FIG. 4 together, it is possible to reduce the entire change amount and display.

[0026]

However, in the above-mentioned prior application, the change of the linearity in the vertical direction is performed by correcting the vertical deflection current and changing the position of the horizontal scanning line to be displayed. . Therefore, such a method is possible in a display using a cathode ray tube.

However, in a digital addressing type device such as a liquid crystal display, the position of the horizontal scanning line displayed as described above cannot be changed. In addition, even in a display using a cathode ray tube, there is a device in which the position of the horizontal scanning line cannot be changed.

This application has been made in view of such a point, and the problem to be solved is to solve the problem of the position of the horizontal scanning line to be displayed, as in the case of a digital addressing type device such as a liquid crystal display. It is said that the device which cannot change the display could not display like the previous application.

[0029]

According to the first means of the present invention, when displaying a 4: 3 standard aspect video signal on a 16: 9 wide aspect display screen, the video signal is written in an image memory. The video signal written in the image memory is read for each horizontal scanning line, and means for converting each read horizontal scanning line at a predetermined conversion ratio by digital processing is provided. The horizontal width is made substantially equal to the horizontal width of the display screen, and at least one of the vicinity of the upper and lower ends of the display of the video signal is compressed in the vertical direction so that the vertical width of the display of the video signal is the vertical width of the display screen. The image processing device is configured to substantially match with.

According to the second means of the present invention, when displaying a video signal having a standard aspect ratio of 4: 3 on a display screen having a wide aspect ratio of 16: 9, the video signal is written in an image memory and written in the image memory. The video signal is read for each horizontal scanning line, and means for converting each read horizontal scanning line by a predetermined conversion ratio by digital processing is provided. The horizontal width of the display of the video signal is displayed on the display screen. Of the video signal, and at least one of the vicinity of the upper and lower ends of the display of the video signal is vertically compressed so that the vertical width of the display of the video signal substantially matches the vertical width of the display screen. Image processing method.

The third means of the present invention is to display a 4: 3 standard aspect video signal on a 16: 9 wide aspect display screen (display device 8).
The video signal is written in the image memories 2R, 2G, 2B, the video signal written in the image memory is read out for each horizontal scanning line (control signal generation circuit 4), and each read horizontal scanning line is digitally read. A means for converting at a predetermined conversion ratio by processing (operation circuits 3R, 3G, 3B,
A coefficient generating section 5) for making the horizontal width of the display of the video signal substantially equal to the horizontal width of the display screen, and compressing at least one of the upper and lower ends of the display of the video signal in the vertical direction, A television receiver in which the vertical width of the display of the video signal is substantially matched with the vertical width of the display screen.

A fourth means according to the present invention is the television receiver according to the third means, wherein the display screen is composed of a digital addressing type device. .

A fifth means according to the present invention is the television receiver described in the fourth means, wherein the device is a liquid crystal display.

[0034]

According to this, the video signal is written in the image memory, the video signal written in the image memory is read out for each horizontal scanning line, and each read horizontal scanning line is subjected to a predetermined conversion by digital processing. The horizontal width of the video signal display is made to approximately match the horizontal width of the display screen, and at least one of the upper and lower edges of the video signal display is vertically compressed to convert the vertical width of the video signal display. By making the display approximately match the vertical width of the display screen,
Even if the device cannot change the position of the horizontal scanning line displayed like a digital addressing type device such as a liquid crystal display, a 4: 3 standard aspect video signal is displayed on a 16: 9 wide aspect display screen. Can be displayed in good condition.

[0035]

BEST MODE FOR CARRYING OUT THE INVENTION In FIG. 1, a video signal is input as an analog signal of R / G / B or Y / RY-BY, and A / D
The signals are quantized by the converters 1R, 1G and 1B and converted into digital signals. Frame memory (image memory) 2
R, 2G, and 2B store the video signals converted into digital signals by the respective A / D converters 1R, 1G, and 1B.

The arithmetic circuits 3R, 3G, and 3B have data for two horizontal scanning lines read from the data stored in the frame memories 2R, 2G, and 2B, and a coefficient generator 5 to be described later.
From the D / A converters 7R, 7G, and 7B as new scanning line data.

The control signal generation circuit 4 creates a write (W) control signal to the frame memories 2R, 2G and 2B from the horizontal / vertical synchronizing signals of the input video signal and the operation clock. In addition, a read (R) control signal for the frame memories 2R, 2G, and 2B is generated from the output signal timing set by the microprocessor (CPU) 6 and the operation clock.

Write and read control signals (R / W) from these control signal generation circuits 4 are sent to the frame memories 2R, 2G, 2B. Further, the clear signal for starting the reading and the line number information of the scanning line being read are simultaneously sent to the coefficient generator 5.

Therefore, the coefficient generator 5 includes a read only memory (ROM) 51 and a random access memory (RA).
M) 52, a comparator 53 and an address counter 54.

In the ROM 51, various conversions (compression / compression /
(Enlargement) The interpolation coefficient data for each ratio is stored separately for each address. In the RAM 52, the change line data and the mode data for setting the conversion ratio up to what line of the output scanning line from the CPU 6 are paired, and several patterns are stored in order from the smallest line number. . The pattern read from the RAM 52 is set by the value from the address counter 54.

Then, the address counter 54 becomes "0" by the clear signal at the start of reading, and RA
The first pattern data is output from M52. The mode data of this pattern becomes the address of ROM51,
From the ROM 51, the interpolation coefficient for that mode is output for each line.

The changed line data of this pattern is also output to the comparator 53, and the comparator 53 compares the changed line data with the value of the read line number coming from the control signal generation circuit 4, and if they match. The addition pulse is output to the address counter 54. Address counter 5
4 receives the addition pulse, increments the address by "1" and outputs it to the RAM 52, and the RAM 52 outputs the next pattern data.

In this way, the scan line data having different conversion ratios are set in the RAM 52 in the order set by the arithmetic circuits 3R and 3R.
Created with G and 3B. Furthermore, D / A converters 7R, 7
G and 7B convert the digital signals sent from the arithmetic circuits 3R, 3G and 3B into analog signals, and display the display device 8
Output as a video signal.

Thus, according to the above apparatus, the video signal is written in the image memory, the video signal written in the image memory is read out for each horizontal scanning line, and each read horizontal scanning line is digitally processed. The video signal is displayed at a predetermined conversion ratio so that the horizontal width of the video signal display is approximately equal to the horizontal width of the display screen, and at least one of the upper and lower edges of the video signal display is vertically compressed to display the video signal. By making the vertical width of the display substantially match the vertical width of the display screen, even in a device in which the position of the horizontal scanning line displayed cannot be changed like a digital addressing type device such as a liquid crystal display, 1
It is possible to excellently display a 4: 3 standard aspect video signal on a 6: 9 wide aspect display screen.

Further, according to the above-mentioned apparatus, good display can be performed even when displaying non-trimming video software in a so-called cinema scope size. That is, in some of such video software, as shown in FIG. 2A, subtitles are displayed on the lower portion outside the screen. In that case, in the conventional enlarged display, the subtitle at the bottom of the screen is cut off and not displayed as shown in B of FIG.

On the other hand, in the above-mentioned apparatus, for example, the display as shown in C of FIG. That is, in this case, although the subtitles are somewhat flat, there is no hindrance to the reading, and such video software can be viewed well.

In order to perform such display, first, the line number L1 of the subtitle portion of the input signal is measured at A in FIG. Next, on a 16: 9 wide aspect display screen, as shown in B of the same figure, the upper black part of the input signal is shifted upward so as to be out of the frame of the screen, and the displayable line of the subtitle part at this time. Measure the number L2.

Then, in the above apparatus, the conversion ratio is L2 / L1.
By setting the interpolation coefficient so that, the subtitle portion is compressed, and a 16: 9 wide aspect display screen is displayed as shown in C of FIG.

As described above, according to the above-mentioned apparatus, even if the apparatus cannot change the position of the horizontal scanning line to be displayed, such as a digital addressing type device such as a liquid crystal display, the so-called cinema scope size Good display can be achieved when displaying non-trimming video software with.

[0050]

According to the present invention, the video signal is written in the image memory, the video signal written in the image memory is read out for each horizontal scanning line, and each read horizontal scanning line is digitally processed. The video signal is displayed at a predetermined conversion ratio so that the horizontal width of the video signal display is approximately equal to the horizontal width of the display screen, and at least one of the upper and lower edges of the video signal display is vertically compressed to display the video signal. By making the vertical width of the display substantially match the vertical width of the display screen, even in a device in which the position of the horizontal scanning line displayed cannot be changed like a digital addressing type device such as a liquid crystal display, It has become possible to display a 4: 3 standard aspect video signal in a good condition on a 16: 9 wide aspect display screen.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an example of a television receiver according to the present invention.

FIG. 2 is an explanatory diagram of an example of the display.

FIG. 3 is an explanatory diagram of a display of a conventional television receiver.

FIG. 4 is an explanatory diagram of a display of a conventional television receiver.

FIG. 5 is a table used for explaining the prior application.

FIG. 6 is an explanatory diagram of a display of the television receiver of the prior application.

FIG. 7 is a configuration diagram of an example of a circuit for realizing the display of the prior application.

FIG. 8 is a waveform diagram for the explanation.

FIG. 9 is a configuration diagram of another example of a circuit for realizing the display of the prior application.

[Explanation of symbols]

 1R, 1G, 1B A / D converter 2R, 2G, 2B Frame memory (image memory) 3R, 3G, 3B Arithmetic circuit 4 Control signal generation circuit 5 Coefficient generation circuit 51 Read only memory (ROM) 52 Random access memory (RAM) ) 53 comparator 54 address counter 6 microprocessor (CPU) 7R, 7G, 7B D / A converter 8 display device

Claims (5)

[Claims] 1. When displaying a 4: 3 standard aspect video signal on a 16: 9 wide aspect display screen, the video signal is written to an image memory, and the video signal written to the image memory is horizontally scanned. It has a means for reading out each line and converting each read horizontal scanning line by a predetermined conversion ratio by digital processing, and makes the horizontal width of the display of the video signal substantially coincide with the horizontal width of the display screen. At the same time, at least one of the vicinity of the upper and lower ends of the display of the video signal is vertically compressed so that the vertical width of the display of the video signal substantially matches the vertical width of the display screen. 2. When displaying a 4: 3 standard aspect video signal on a 16: 9 wide aspect display screen, the video signal is written in an image memory and the video signal written in the image memory is horizontally scanned. It has a means for reading out each line and converting each read horizontal scanning line by a predetermined conversion ratio by digital processing, and makes the horizontal width of the display of the video signal substantially coincide with the horizontal width of the display screen. At the same time, at least one of the vicinity of the upper and lower ends of the display of the video signal is vertically compressed so that the vertical width of the display of the video signal substantially matches the vertical width of the display screen. 3. When displaying a 4: 3 standard aspect video signal on a 16: 9 wide aspect display screen, the video signal is written to an image memory, and the video signal written to the image memory is horizontally scanned. It has a means for reading out each line and converting each read horizontal scanning line by a predetermined conversion ratio by digital processing, and makes the horizontal width of the display of the video signal substantially coincide with the horizontal width of the display screen. At the same time, at least one of the vicinity of the upper and lower ends of the display of the video signal is vertically compressed so that the vertical width of the display of the video signal substantially matches the vertical width of the display screen. 4. The television receiver according to claim 3, wherein the display screen is composed of a digital addressing type device. 5. The television receiver according to claim 4, wherein the device is a liquid crystal display.