JPH02112393A - Successive scanning and transforming device for television signal - Google Patents

Abstract

PURPOSE:To reduce hardware quantity and a setting space and to miniaturize a whole picture quality improving device at low cost by simultaneously executing successive scan and transformation and contour compensation in a vertical direction by a common processing system. CONSTITUTION:In the successive scanning and transforming device of a television signal, the successive span and transformation by motion adaptive control and the contour compensation is simultaneously executed by the common device. Thus, the quantity of the hardware such as a line memory or an adder and subtracter, etc., and the setting space can be reduced. Then, the whole picture quality improving device can be miniaturized at low cost. With the simultaneous processing, a processing time is shortened and a delay circuit for the adjustment of delay quantity with a sound system is eliminated. Then, the hardware quantity is much more reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a progressive scan conversion device for television signals installed in a high-definition television receiver or the like.

(Prior art) High-definition (IDTV, EDTV) television receivers currently under development first convert received television video signals of existing standard formats such as NTSC into digital video signals.
After performing various image quality improvement processes such as /C separation, noise reduction, conversion to progressive scanning, and contour compensation, the signal is converted back to an analog video signal and supplied to the display unit.

The scan converter that performs the conversion to the progressive scan described above is the 14th scan converter.
As shown in the figure, cascaded delay memories 81, 82
．． 83, adder/subtractor 84, 85, 86, 87, coefficient unit 88, 89, motion detection circuit 90, and time axis compression circuit 9
1, which converts the interlaced scanning NTSC television signal supplied to the input terminal IN into a progressive scanning television signal with twice the line density and outputs it to the output terminal OU.
Output to T.

Focusing on the pixel signal a appearing at the output terminal of the 262-line delay memory 81, and assuming that it exists on the nth line of the current field as shown in FIG. The pixel signal appearing at the output terminal of 82 exists on the (n-1)th line one line before in the current field of the interlaced scanning system. Also, 262
Pixel signal C appearing at the output terminal of line delay memory 83
The pixel signal d appearing at the input terminal of the 262-line delay memory 81 is, as shown in FIG. The upper pixel signal appears between the nth line and the (n-1)th line of the current field. That is, if the current field containing pixel signals a and b is an odd field in the interlaced scanning method, the field containing pixel signal C is an even field before l fields, and the field containing pixel signal d is an even field after one field. It is an even field.

The adder 84 outputs an interpolated line signal (a+b) generated based on the correlation between adjacent lines, and the adder 85 outputs an interpolated line signal (c+d) generated based on the correlation between adjacent frames. . Each interpolated line signal is
In a combining circuit consisting of an adder 86 and coefficient units 88 and 89, the signals are combined by (1-k) at a changeable combining ratio, and the following interpolated line signal e is generated.

= k(a+b)/2+(1-k)(c+d)/
2. The motion detection circuit 90 detects motion in the display screen from the inter-frame difference signal output from the subtracter 87, and controls the coefficient values of the coefficient units 88 and 89 in accordance with the detected motion, thereby determining the synthesis ratio. (1-k) is dynamically controlled. If there is no motion at all, k in equation (1) is set to 0, and the interpolated line signal e is composed only of the component (c+d)/2 generated based on the correlation between adjacent frames. If there is a large movement, the equation (1) is set to l, and the interpolated line signal e is composed only of the component (a+b)/2 generated based on the correlation between adjacent lines within the field.

As shown in FIG. 16, the apparatus for performing vertical contour compensation on the progressively scan-converted television signal is composed of cascade-connected one-line delay memories 101 and 102 and adders and subtracters 103 and 104. has been done. however,
The delay time of one line due to the l-line delay memories 101 and 102 corresponds to the delay time of a half line in the interlaced scanning method, as the time axis is compressed in half by progressive scan conversion. Therefore, the pixel signal appearing at the input terminal of the l-line delay memory 101 is converted into the pixel signal a of interest in FIG.
Then, the pixel signals appearing at the input terminal and output terminal of the 1-line delay memory 102 are the pixel signals e, l! in FIG. 15, respectively. :b. By subtracting half (a+b)/2 of the output of the adder 103 from the pixel signal e in the subtracter 104, a contour compensation signal for the pixel signal e,
Δ e = Ce-(a + b)/2) is generated and output to the output terminal OUT.

(Problems to be Solved by the Invention) Progressive scan conversion and contour compensation using motion adaptive control
In the conventional image quality improvement processing method using a dedicated processing system as shown in the figure and Fig. 16, line memory, adder/subtractor, etc. are duplicated in each processing system, which increases the amount of hardware and installation space and improves image quality. There is a problem that the entire device becomes expensive and large.

Further, there is also the problem that delay time associated with processing is accumulated in each processing system, and additional delay circuits are required for adjusting the amount of delay with the audio system, further increasing the amount of hardware.

(Means for Solving the Problems) A progressive scan conversion device for television signals according to the present invention provides a first interpolation line that generates a first interpolation line from adjacent lines in an original field based on a correlation between adjacent lines in a field.
a second interpolation line generation means for generating a second interpolation line from the previous and subsequent fields based on the correlation between adjacent frames, and dynamically changing the composition ratio according to movement on the display screen. While the above 1. In addition to a motion adaptive synthesis means that generates and outputs an interpolation field consisting of a group of synthesized interpolation lines by synthesizing the second interpolation line, each line in the ring field and one line before and after it. an original field vertical contour compensation signal generation unit that generates a contour compensation signal for each line in the ring field from two lines in the interpolation field that are separated by two lines;
an interpolation field contour compensation signal generation unit that generates a vertical contour compensation signal for each line in the interpolation field from each line in the interpolation field and two lines in the ring field separated by one line before and after the interpolation field; and the original field. a synthesis control section that synthesizes the output of the vertical contour compensation signal generation section for the interpolation field onto a corresponding line in the ring field while decreasing the synthesis ratio in accordance with an increase in movement in the display screen, and a vertical contour compensation signal generation section for the interpolation field. It is equipped with a compositing system i15 unit that combines the output of the section with the corresponding line in the interpolation field while decreasing the compositing ratio according to the increase in movement in the display screen, and has a common function of progressive scan conversion and vertical contour compensation. It is configured to be executed simultaneously by two processing systems.

According to one embodiment of the present invention, the second interpolation line generation means is configured to generate the second interpolation line while performing high-pass filtering in the vertical direction.

According to the progressive scan conversion device for television signals according to the invention of Mizui 2, the first interpolation line generates the first interpolation line from the adjacent lines in the ring field based on the correlation between adjacent lines in the field. a second interpolation line generation means that generates a second interpolation line while performing high-pass filter processing in the vertical direction from the preceding and following fields based on the correlation between adjacent frames; while dynamically changing the synthesis ratio. In addition to a motion-adaptive synthesis means that generates and outputs an interpolation field consisting of a group of synthesized interpolation lines by synthesizing the second interpolation line, each line in the ring field and the adjacent lines before and after it. a first vertical contour compensation signal generator for the original field that creates a contour compensation signal for each line in the ring field from two lines in the interpolation field, and a ring field adjacent to each line in the ring field before and after it; The second line for the original field creates a contour compensation signal for each line in the ring field from the two lines in the ring field.
a vertical contour compensation signal generating section for the interpolation field, which generates a vertical contour compensation signal for each line in the interpolation field from each line in the interpolation field and two lines in the ring field adjacent before and after the interpolation field; a contour compensation signal generation unit; and a second contour compensation signal for an interpolation field that creates a vertical contour compensation signal for each line in the interpolation field from four lines in the ring field adjacent before and after each line in the interpolation field. a generator, and a first . The operation of synthesizing and outputting a vertical contour compensation signal for each line of the original field by composing the output of the second vertical contour compensation signal generation section while dynamically changing the composition ratio according to the movement on the display screen. adaptive synthesis means and a first . The operation of synthesizing and outputting a vertical contour compensation signal for each line of the interpolation field by composing the output of the second vertical contour compensation signal generation section while dynamically changing the composition ratio according to the movement on the display screen. It is configured to perform motion adaptive control not only for progressive scan conversion but also for contour compensation.

According to an embodiment of the second invention, the first interpolation line generating means generates the first interpolation line while applying vertical low-pass filtering to the front and rear adjacent lines in the field. Equipped with a filter circuit.

Hereinafter, the operation of the present invention will be explained in detail together with examples.

(Embodiment) FIG. 1 shows a time axis pressure i'? of a progressive scan conversion apparatus for television signals according to an embodiment of the present invention. It is a block diagram showing the configuration of the front stage of the i circuit, where IN is an input terminal for a television signal to be subjected to progressive scan conversion, 01 is an output terminal for an original field television signal subjected to vertical contour interpolation, and 0
2 is an output terminal for a television signal of an interpolated field that has undergone vertical contour interpolation.

This progressive scan conversion device includes cascade-connected 263-line delay memory 13, 1-line delay memory 2a, 261-line delay memory 3a, adder/subtractor 5°6.7..., motion detection circuit 13, and coefficient generator. A circuit 14 and a coefficient unit 24 with fixed coefficient values. ．． 33, and nonlinear processing circuits 34a and 34b
and coefficient units 4a, 4b, 9a, 35a, and 35b whose coefficient values are dynamically changed according to the magnitude of movement on the display screen.

An l-line delay memory 2a which gives an input television signal a delay equal to the time required to display a horizontal scanning line (line) and outputs the resultant signal, coefficient units 4a and 4b, and an adder 5. A first interpolation line generation unit is formed that generates a first interpolation line from adjacent lines in the original field based on the correlation. Also, a second interpolation line is generated from the previous and subsequent fields based on the correlation between adjacent frames from the 263-line delay memory 1a, 1-line delay memory 2a, and 261-line delay memory 3a, and the adder 6 and 1-line delay memory 8a. A second interpolation line generation section is formed.

That is, if the pixel signal α on the 2nth line in the original field (assumed to be an even field) is appearing at the input terminal of the 1-line delay memory 2a, as illustrated in FIG. The pixel signal ε on the immediately preceding line in this even field, that is, the 2n-2nd line, appears at the output terminal of the 1-life delay memory 2a. Here, one line in the l-line delay memory 2a refers to one line in the original field to be subjected to progressive scan conversion, and this refers to two lines in one field after progressive scan conversion, which is composed of an original field and an interpolation field. corresponds to This is 263 line delay memory 1a and 2
The same holds true for the significance of the l line regarding the 61-line delay memory 3a.

In FIG. 2, the lines indicated by solid lines are lines forming the original field appearing at the input terminal of the one-line delay memory 2a, and the lines indicated by dotted lines are fields appearing one field before or after this original field. ,
This is also the line that makes up the interpolated field generated from the original field.

At the input terminal of the 263-line delay memory 1a, the pixel signal β on the 2n101st line in the odd field after one field appears, and at the output terminal of the 261-line delay memory 3a, the pixel signal β from the odd number field one field before appears. 20 in the field
The pixel signal T on the +1st line appears.

Therefore, if the coefficient values of the coefficient units 4a and 4b are bl, the pixel signal output from the adder 5; θ1-bl(α±ε)
is the first interpolated pixel signal generated from the adjacent inner and outer pixels based on the interline correlation for the pixel signal θ on the 20-1st line in the interpolated odd field. Also, a pixel signal obtained by delaying the pixel signal (β+T) output from the adder 6 by one life by the one-line delay memory 8a; θ2−(β
10γ)Z-1 is a second interpolated pixel signal generated from the preceding and succeeding adjacent fields based on the interframe correlation for the pixel signal θ on the 20-1st line in the interpolated odd field.

A synthesis control section composed of coefficient units 4a, 4b, and 9a and an adder 11 converts the first interpolation pixel signal θ1 and the second interpolation pixel signal θ2 according to the magnitude of movement on the display screen. to dynamically change the composition ratio. This synthesis ratio is dynamically changed by the coefficients generated by the coefficient generation section 14 according to the magnitude of the motion output from the motion detection circuit 13.

That is, the difference signal ΔF between adjacent frames outputted from the adder 12 is supplied to the motion detection circuit 13 as a signal indicating the magnitude of motion existing on the display screen. The motion detection circuit 13 includes an absolute value circuit 51 as shown in FIG.
, a comparison circuit 52.53.54, and a decoder 55. The inter-frame difference signal ΔF supplied to the input terminal
．． 53 and 54, respectively. The other input terminals of the comparison circuits 52 to 54 are supplied with reference values A, B, and C that increase sequentially, and the comparison results x, y, and z are supplied to a decoder 55.

As shown in Figure 5, whether the absolute value of ΔF is less than reference value A, greater than or equal to reference value A and less than B, greater than or equal to reference value B and less than C, or greater than or equal to reference value C. Four types of combinations (xyz) of the comparison results are supplied to the decoder 55 in accordance with the comparison results, and the decoder 55 that receives these outputs a 2-bit binary signal and supplies it to the coefficient generation circuit 14.

As shown in FIG. 4, the coefficient generation circuit 14 includes a line delay memory 61, a maximum value selection circuit 62, and a coefficient generator 6.
3.64.65. Coefficient generation circuit 6
3 generates the coefficients aO and bi illustrated in FIG. 5 from the 2-bit decoder output supplied from the input terminal I via the 1-line delay memory 61, and inputs them to the coefficient multipliers 4a and 4b.
and the coefficient unit 9a.

Therefore, in a still image where the difference signal ΔF between adjacent frames is smaller than the reference value A or in a state close to this, b1/aO becomes zero, and the interpolated field is is generated and supplied to the time base compression circuit via the output terminal 02. Conversely, in a state where the difference signal ΔF between adjacent frames has a large movement larger than the reference value C, a O/b 1 becomes zero, and only the first interpolation line generated based on the correlation between adjacent lines in the field An interpolated field is generated. In a state intermediate between the above two states, the first . An interpolated field is generated by the second interpolated line.

In this way, if the motion is small, by generating an interpolation field based mainly on inter-frame correlation, deterioration in vertical resolution that would occur when inter-line correlation is mainly used can be effectively prevented. Further, if the movement is large, double image interference caused by the movement can be effectively prevented by generating an interpolation field based on interline correlation.

The output from the subtracter 31 is Δα−2α−[(β+T)+θ2]/22α−(β+r
) (1+Z-') /2 is 2 in the ring field
A nonlinear circuit 34a performs nonlinear processing as a vertical contour compensation signal for the pixel signal α on the nth line, and a coefficient according to the movement is multiplied by a coefficient multiplier 35a. It is combined with signal α.

Similarly, the output from the subtractor 32, Δθ=02−(α+ε)=(β+r>Z−′−(α+ε)), is the vertical contour compensation signal for the pixel signal θ on the 2n−1th line in the interpolation field. As, nonlinear circuit 3
4b performs non-linear processing, and after being multiplied by a coefficient corresponding to the motion in a coefficient unit 35b, the signal is combined with the pixel signal θ to be contour compensated in an adder 43.

The coefficient (1-k r) of the coefficient unit 35a and the coefficient unit 35b
The coefficient (1-ki) is generated in the coefficient generators 65 and 64 in the coefficient circuit 14 shown in FIG. 4 as a value according to the magnitude of the movement as illustrated in FIG. . That is, the difference signal ΔF between adjacent frames is smaller than the reference value A (in a still image or a state close to this, the coefficients (1-kr) and (1-ki) are both 1, and the nonlinear circuits 34a and 3
The output of 4b provides maximum contour compensation. vice versa,
When the difference signal ΔF between adjacent frames is larger than the reference value C and there is a large movement, the coefficients (1-kr) and (1-ki) are both O, and no contour compensation is performed. In a state intermediate between the above two states, contour compensation is performed with a magnitude that is reduced depending on the magnitude of the movement.

In this way, by weakening contour compensation, which uses contour compensation signals generated from adjacent lines in an interpolation field generated based on interframe correlation, in accordance with the magnitude of movement on the display screen, the double Deterioration of contour compensation characteristics due to image interference can be effectively prevented.

As shown in the block diagram of FIG. 6, the nonlinear circuits 34a and 34b in FIG. 1 include a sign discrimination circuit 71 and an absolute value circuit 72.
, a coring circuit 73, a slope setting circuit 74, a limiter circuit 75, and an encoding circuit 76. Input terminal■
Concerning the contour compensation signal supplied to the input/output characteristic diagram of FIG. li
Non-linear processing including slope setting based on l control and limiter processing to prevent white collapse due to excessive contour compensation is performed, and the result is supplied from output terminal O to coefficient units 35a and 35b.

FIG. 8 is a block diagram showing the configuration of a progressive scan conversion apparatus for television signals according to another embodiment of the present invention.

In this figure, the components with the same reference numerals as those in FIG. 1 are the same components as those already explained with respect to the apparatus of the embodiment shown in FIG. 1, and therefore, redundant explanations thereof will be omitted.

The progressive scan conversion device shown in FIG. 8 is different from the progressive scan conversion device shown in FIG. The point is that a directional high-pass filter circuit is formed.

This vertical high-pass filter circuit includes one-line delay memories 8a, 8b, coefficient units 9a, 9b, 9c, and an adder 1.
The pixel signal (β+γ) output from the adder 6 consisting of The upper pixel signal θ=(β+γ)Z and i=(
β+γ)Z-". The three types of pixel signals delayed by l lines are input to the 10th pixel signal by the coefficient multipliers 9a, 9b, and 9c.
As illustrated in the figure, the coefficients aO and al of opposite polarity are multiplied and then synthesized in the adder 10, resulting in a high-pass filtered interpolated signal θ = (β+T) (a 1 +a OZ-'+a IZ-
2) and is supplied to one input terminal of the adder 11.

FIG. 11 is a block diagram showing the configuration of a progressive scan conversion apparatus for television signals according to still another embodiment of the present invention. In this figure, the components with the same reference numerals as in FIGS. 1 and 8 are the same components as those already explained with respect to the apparatus of the embodiment shown in these figures, so there will be no duplication. Omit the explanation.

The progressive scan converter shown in FIG. 11 differs from the progressive scan converter shown in FIG. 8 in the following two points.

(i) A circuit that generates a contour compensation signal using only adjacent lines in the original field for each of the original field and the interpolation field, and a conventional circuit that generates a contour compensation signal using only the contour compensation signal and adjacent lines in the interpolation field. The present invention is equipped with a motion adaptive synthesis circuit that synthesizes the 1-k signal and (1-k) at a ratio that is dynamically changed according to the magnitude of movement on the display screen.

(ii) The first interpolation line generating section is provided with a vertical low-pass J filter circuit for three adjacent lines.

Adder 22, coefficient unit 24, subtracter 26, nonlinear circuit 27
b generates a contour compensation signal for the original field using only adjacent lines within the original field. That is,
As shown in FIG. 12, if the pixel signal to be contour compensated in the original field is α, then the adder 22 outputs the sum (δ + ε
) is output. The subtracter 26 subtracts the pixel signal (δ+ε) from the pixel signal 2α supplied via the coefficient multiplier 24 which gives a fixed coefficient value 2, and calculates the pixel signal α in the original field from the adjacent line in the original field. A second contour compensation signal Δ2α=2α−(δ+ε) generated from only the second contour compensation signal is output as follows.

Similarly, adders 21, 23, subtracter 25, nonlinear circuit 2
7a generates a contour compensation signal for the interpolated field only from adjacent lines in the original field. That is, as shown in FIG. 12, if the pixel signal to be contour compensated in the interpolation field is θ, then the adder 21 outputs the sum of the pixel signal ε half a line before and the pixel signal α half a line after (α+ε )
is output. Also, from the adder 23, the sum (ζ+δ
) is output. The subtracter 25 receives the pixel signal (α+ε
) is subtracted from the pixel signal (ζ+δ) and output as a second contour compensation signal Δ2θ=(α+ε)−(ζ+δ) generated from only the adjacent lines in the original field with respect to the pixel signal θ in the interpolation field.

On the other hand, the subtracter 31 outputs a first contour compensation signal Δ1 α for the pixel signal α in the original field generated based on the adjacent line in the interpolation field, and the subtracter 32
outputs a first contour compensation signal Δ1 θ for the pixel signal θ in the interpolation field generated based on adjacent lines in the original field. Further, coefficients kr and ki corresponding to the magnitude of the movement shown in FIG. 13 are generated by the coefficient generation circuit 14 and supplied to each of the coefficient multipliers 28a and 28b. Therefore, the adder 40 outputs a contour compensation signal for the pixel signal α in the original field, Δα=(L−kr)Δ, ot+krΔ2α,
It is supplied to an adder 42.

Also, from the adder 41, a pixel signal θ in the interpolation field is output.
A contour compensation signal for Δθ''(1-ki)Δ, θ+kiΔ2θ is output and supplied to the adder 43.

Therefore, in a still image where the difference signal ΔF between adjacent frames is smaller than the reference value A or in a state close to this, kr/(1-kr)
kf/<1-ki) becomes zero, and contour compensation is performed only by the contour compensation signal generated using the adjacent lines in the interpolation field generated from the previous and previous fields based on the interframe correlation, and the high frequency components are enriched. clear contour compensation is possible. Conversely, in a state where the difference signal ΔF between adjacent frames has a larger movement than the basic value C, (1kr)/
Both kr and (1-kj)/ki become zero, and contour compensation is performed only by the contour compensation signal generated using the adjacent lines in the interpolation field, which is generated based on the correlation between adjacent lines in the field, and the motion is Double image disturbance due to influence is effectively prevented. In a state intermediate between the above two states, the first . Contour compensation is performed for each of the original field and the interpolated field using the second contour compensation signal.

Furthermore, in the progressive scan conversion device illustrated in FIG.
As illustrated in FIG. 3, a coefficient b1 that is changed according to the magnitude of the movement is generated by the coefficient generation circuit 14, and a coefficient b1 is generated in the vertical low-pass filter circuit formed in the first interpolation line generation section. 4b and 40. Further, the coefficient b2 illustrated in FIG. 13 generated by the coefficient generation circuit 14 is
It is supplied to coefficient multipliers 4a and 4d in the vertical low-pass filter circuit. Since these coefficients b1 and b2 have the same polarity, 2n+ in the interpolation field shown in FIG.
Vertical low-pass filtering is performed on adjacent lines in the original field, four lines before and after the first line.

The configuration in which the subtraction circuit for generating an inter-frame difference signal and the motion detection circuit 13 are installed in this progressive scan conversion device has been exemplified above. However, a configuration may be adopted in which these circuits are shared with other signal processing devices.

(Effects of the Invention) As explained in detail above, the progressive scan conversion device for television signals according to the invention of Mokushi 1 has a configuration that simultaneously performs progressive scan conversion using motion adaptive control and contour compensation using a common device. Because of this, the amount of hardware such as line memory and adder/subtractor and the installation space are reduced, and the entire image quality improvement device becomes cheaper and smaller.

Additionally, simultaneous processing reduces processing time, eliminates the need for a delay circuit for adjusting the amount of delay with the audio system, and further reduces the amount of hardware.

The progressive scan conversion device for television signals according to the invention of Mokuhuru 2 is configured to perform motion adaptive control not only for the progressive scan conversion processing but also for the contour compensation processing, so it is possible to achieve the optimum image quality according to the situation of the display screen. The effect is that it can always be achieved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of the front stage of the time base compression circuit in a progressive scan conversion device for television signals according to an embodiment of the present invention, and FIG. A conceptual diagram showing the mutual positional relationship of pixel signals on the display screen, FIG. 3 is a block diagram showing an example of the configuration of the motion detection circuit 13 in FIG. 1, and FIG. 4 is a diagram showing the coefficient generation circuit 1 in FIG. 1.
4 is a block diagram showing an example of the configuration of FIG. 4, FIG. 5 is a conceptual diagram for explaining an example of the operation of the circuits in FIGS.
The figure is a block diagram showing an example of the configuration of the nonlinear processing circuits 34a and 34b shown in FIG. 1, FIG. 7 is a conceptual diagram showing an example of the human output characteristics of the nonlinear processing circuit shown in FIG. 9 is a block diagram showing the configuration of another embodiment of the progressive scanning device of
The figure is a conceptual diagram showing the mutual positional relationship on the display screen for the pixel signals appearing in each part of FIG. 8, and FIG. 10 is a conceptual diagram illustrating the relationship between the coefficient value and movement of the coefficient unit in FIG. 11 is a block diagram showing the configuration of a progressive scan conversion device according to an embodiment of the invention of Mizuo 2, and FIG. 12 shows the mutual relationship between pixel signals appearing in each part of FIG. FIG. 13 is a conceptual diagram illustrating the relationship between the coefficient values of the coefficient multiplier in FIG. 11 and motion, and FIG. 14 shows the configuration of a conventional progressive scan conversion device using motion adaptive control. A block diagram, FIG. 15 is a conceptual diagram showing the mutual positional relationship in the display screen of the pixel signals appearing in each part of FIG. 14,
FIG. 16 is a block diagram showing the configuration of a conventional vertical contour compensation device. IN... Input terminal for television signals to be progressively scanned, la, 2a, 3a, 8a 8b... Delay memory that delays the input signal by a predetermined number of lines and outputs it, 5.6.7.10 .11...addition/subtraction device, 13...
Motion detection circuit, 14... Coefficient generation circuit, 24.33.
・Coefficient unit with fixed coefficient value, 27a, 27b, 34a, 3
4b/Nonlinear processing circuit, 4a, 4b, 4c, 4d, 9
a, 9b, 9c, 28a, 28b, 35a, 35b...
・Coefficient unit whose coefficient value is dynamically changed according to the magnitude of movement on the display screen, ol...Original field output terminal,
02... Output terminal of interpolation field, 51... Absolute value circuit, 52.5354... Comparator, 55... Decoder, 61... 1 line delay circuit, 62... Maximum value selection circuit, 63.64.65... Coefficient generation circuit. Figure 1 Patent applicant: NEC Home Electronics Co., Ltd.

Claims (5)

[Claims] (1) A first interpolation line generation means that generates a first interpolation line from adjacent lines in the original field based on the correlation between adjacent lines in the field, and a first interpolation line generation means that generates a first interpolation line from adjacent lines in the original field based on the correlation between adjacent lines in the field, and a second a second interpolation line generation means for generating an interpolation line; and a synthesized interpolation line by composing the first and second interpolation lines while dynamically changing a synthesis ratio according to movement on the display screen. a motion-adaptive synthesis means that generates and outputs an interpolation field consisting of a group; A vertical contour compensation signal generation unit for the original field that creates a contour compensation signal, and vertical contour compensation for each line in the interpolation field from each line in the interpolation field and two lines in the original field separated by one line before and after it. The output of the interpolated field contour compensation signal generation section that creates a signal, and the original field vertical contour compensation signal generation section is displayed to reduce the synthesis ratio in accordance with an increase in movement in the original field, and to generate a corresponding line in the original field. a synthesis control section that synthesizes the output of the interpolation field vertical contour compensation signal generation section with a corresponding line in the interpolation field while decreasing the synthesis ratio in accordance with an increase in movement in the display screen. A progressive scan conversion device for television signals, comprising: (2) The second interpolation line generation means includes means for generating the second interpolation line while performing high-pass filtering processing in the vertical direction. A progressive scan conversion device for television signals. (3) first interpolation line generation means for generating a first interpolation line from adjacent lines in the original field based on the correlation between adjacent lines within the field; a second interpolation line generation means for generating an interpolation line; and a synthesized interpolation line by composing the first and second interpolation lines while dynamically changing a synthesis ratio according to movement on the display screen. a motion-adaptive synthesis means that generates and outputs an interpolation field consisting of a group, and a contour compensation signal for each line in the original field from each line in the original field and two lines in the interpolation field adjacent before and after it; The first for the original field to create
a vertical contour compensation signal generation unit for the original field, which generates a contour compensation signal for each line in the original field from each line in the original field and two lines in the original field adjacent before and after it; a contour compensation signal generation unit; a first contour compensation for an interpolation field that creates a vertical contour compensation signal for each line in the interpolation field from each line in the interpolation field and two lines in the original field adjacent before and after it; a signal generation unit; and a second contour compensation signal generation unit for an interpolation field that creates a vertical contour compensation signal for each line in the interpolation field from four lines in the original field adjacent before and after each line in the interpolation field. By combining the outputs of the first and second vertical contour compensation signal generators for the original field while dynamically changing the combination ratio according to the movement on the display screen, a motion-adaptive synthesizing means for synthesizing and outputting contour compensation signals; and dynamically adjusting the synthesis ratio of the outputs of the first and second vertical contour compensation signal generation sections for the interpolation field according to the movement in the display screen. 1. A progressive scan conversion apparatus for television signals, comprising: motion adaptive synthesis means for synthesizing and outputting vertical contour compensation signals for each line of an interpolation field by synthesizing while changing the vertical contour compensation signals. (4) The first interpolation line generation means is characterized by comprising a low-pass filter circuit that generates the first interpolation line while applying vertical low-pass filtering to the front and rear adjacent lines in the field. A progressive scan conversion apparatus for television signals according to claim 3. (5) The second interpolation line generation means includes means for generating the second interpolation line while performing high-pass filtering processing in the vertical direction. 5. The progressive scan conversion device for television signals according to item 4.