JP2557500B2 - Progressive scan conversion device for television signals - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a progressive scan conversion apparatus for a television signal installed in a high quality television receiver or the like.

(Conventional technology) High-definition (IDTV, EDTV) television receivers currently under development convert the existing standard television receiving television video signal such as NTSC into a digital video signal, Y / C separation and noise reduction. After being subjected to various image quality improving processes such as conversion to sequential scanning and contour compensation, the analog image signal is restored and supplied to the display unit.

The scan conversion device that performs the above-described sequential scan conversion is
Cascaded delay memories 81, 82, 83 as shown
An adder / subtractor 84, 85, 86, 87, a coefficient unit 88, 89, a motion detection circuit 90, and a time axis compression circuit 91.
The interlaced scanning type NTSC television signal supplied to is converted into a progressive scanning type television signal having a double line density and output to the output terminal OUT.

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 b appearing at the output terminal of the line delay memory 82 is (n) one line before (n in the current field of the interlaced scanning method).
It exists on the -1) th line. The pixel signal c appearing at the output terminal of the 262 line delay memory 83 and the pixel signal d appearing at the input terminal of the 262 line delay memory 81 are
As shown in FIG. 15, the pixel signals on the n'th line appearing one field before and one field after the current field containing the pixel signals a and b, respectively. Appears in the middle of the (n-1) th line. That is, if the current field containing the pixel signals a and b is an odd field of the interlaced scanning method, the field containing the pixel signal c is the even field one field before, and the field containing the pixel signal d is the field one field after. It is an even field.

The adder 84 outputs a complementary line signal (a + b) generated based on the correlation between adjacent lines, and the adder 85 outputs a complementary line signal (c + d) generated based on the correlation between adjacent frames. To be done. The respective interpolating line signals are combined at a combining ratio k and (1−k) which can be changed in a combining circuit composed of the adder 86 and the coefficient units 88 and 89, and the following interpolation line signal e is generated.

e = k (a + b) / 2 + (1-k) (c + d) / 2 The motion detection circuit 90 detects the motion in the display screen from the inter-frame difference signal output from the subtractor 87, and detects the detected motion. Together, the coefficient values of the coefficient units 88 and 89 are controlled to dynamically control the composition ratios k and (1-k). If there is no motion, k in the equation (1) is set to 0, and the interpolation line signal e is composed of only the component (c + d) / 2 generated based on the correlation between adjacent frames. If there is a large motion, k in the equation (1) is set to 1, and the interpolation line signal e is composed of only the component (a + b) / 2 generated based on the correlation between adjacent lines in the field.

As shown in FIG. 16, a device for vertically contour-compensating a television signal that has been subjected to progressive scan conversion has 15 line delay memories 101 and 102 connected in cascade and an adder / subtractor 1
It is composed of 03 and 104. However, the one-line delay time by the one-line delay memories 101 and 102 corresponds to the half-line delay time of the interlaced scanning method because the time axis is compressed in half by progressive scan conversion. Therefore,
If the pixel signal appearing at the input terminal of the 1-line delay memory 101 is the pixel signal of interest a in FIG. 15, the pixel signals appearing at the input terminal and the output terminal of the 1-line delay memory 102 are respectively shown in FIG. The inner pixel signals e and b are obtained. In the subtractor 104, half of the output of the adder 103 (a +
By subtracting b) / 2, a contour compensation signal for the pixel signal e, Δe = [e− (a + b) / 2], is generated and output to the output terminal OUT.

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

Further, there is a problem that the delay time associated with the processing is accumulated in each processing system, and a delay circuit is further required for adjusting the delay amount with the audio system, which further increases the hardware amount.

(Means for Solving the Problem) A progressive scanning conversion device for a television signal according to the present invention generates a first interpolation line from an adjacent line in an original field based on a correlation between adjacent lines in a field. Interpolation line generation means, second interpolation line generation means for generating a second interpolation line from the immediately preceding field based on the correlation between adjacent fields, and the composition ratio is dynamically changed according to the movement in the display screen. However, in addition to the motion-adaptive synthesizing means for generating and outputting an interpolation field composed of a synthesized interpolation line group by synthesizing the first and second interpolation lines, each line in the original field A vertical contour compensation signal for the original field, which creates a vertical contour compensation signal for each line in the original field from two lines in the interpolation field separated by one line before and after that A vertical contour compensation signal generation for an interpolation field for generating a vertical contour compensation signal for each line in the interpolation field from the signal generation unit and each line in the interpolation field and two lines in the original field separated by one line before and after the line Section, a synthesis control section for synthesizing the output of the vertical contour compensation signal generating section for the original field into a corresponding line in the original field while decreasing the synthesizing ratio in accordance with an increase in motion in the display screen, and the interpolation field. The vertical contour compensation signal generation unit for use in combination with a synthesis control unit for synthesizing the output into the corresponding line in the interpolation field while decreasing the synthesis ratio in accordance with the increase in the motion on the display screen, and progressive scanning conversion and vertical direction The contour compensation and the contour compensation are simultaneously performed by a common processing system.

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

According to the television signal progressive scan conversion apparatus of the second aspect of the present invention, the first interpolation line generation means generates the first interpolation line from the adjacent line in the original field based on the correlation between the adjacent lines in the field. And a second interpolation line generating means for generating a second interpolation line while performing a high-pass filtering process in the vertical direction from the immediately preceding field based on the correlation between adjacent fields, and combining in accordance with the movement in the display screen. In addition to a motion adaptive synthesizing means for synthesizing the first and second interpolation lines while dynamically changing the ratio to generate and output an interpolation field composed of a synthesized interpolation line group, An original field for creating a vertical contour compensation signal for each line in the original field from each line in the original field and two lines in the interpolated field that are adjacent before and after the original field. For the original field for creating a vertical contour compensation signal for each line in the original field from the first vertical contour pavement signal generator for use in the original field, and two lines in the original field adjacent to each line in the original field Second vertical contour compensation signal generation unit of each of the lines in the interpolation field and 2 in the original field adjacent before and after the line.
A first vertical contour compensation signal generation unit for the interpolation field that creates a vertical contour compensation signal for each line in the interpolation field from the line and four lines in the original field that are adjacent before and after each line in the interpolation field From the second vertical contour compensation signal generator for the interpolation field and the first and second vertical contour compensation signal generators for the original field to generate the vertical contour compensation signal for each line in the interpolation field from A motion adaptive synthesizing unit for synthesizing and outputting a vertical contour compensation signal for each line of the original field by synthesizing while dynamically changing the synthesizing ratio according to the motion in the display screen, and for the interpolating field. By interpolating the outputs of the first and second vertical contour compensation signal generators while dynamically changing the synthesis ratio according to the movement in the display screen, And a motion adaptive type synthesizing unit for synthesizing and outputting a vertical contour compensation signal for each line of the field, and is configured to perform motion adaptive control not only for progressive scan conversion but also for contour compensation.

According to one embodiment of the second aspect of the present invention, the low-pass filtering for generating the first interpolation line while the first interpolation line generating means performs reduction filtering processing in the vertical direction on the adjacent lines before and after in the field. It has a circuit.

 Hereinafter, the operation of the present invention will be described in detail with reference to Examples.

(Embodiment) FIG. 1 is a block diagram showing a configuration of a preceding stage of a time axis compression circuit in a television signal progressive scan conversion apparatus according to an embodiment of the present invention, and IN is a television subject to progressive scan conversion. An input terminal for a television signal, O1 is an output terminal for a television signal of an original field after vertical contour interpolation, and O2 is an output terminal for a television signal of an interpolated field after vertical contour interpolation.

This progressive scan conversion device comprises a 1-line delay memory 2a, a 261-line delay memory 3a, a 263-line delay memory 1a connected in cascade, adders / subtractors 5, 7, ..., A motion detection circuit 13, and a coefficient generation circuit 14. , Coefficient units with fixed coefficient values 6, 24, 33, non-linear processing circuits 34a, 34b, and coefficient units 4a, 4b, 9a whose coefficient values are dynamically changed according to the magnitude of movement in the display screen. , 35a, 35b
It has and.

From the 1-line delay memory 2a, which outputs the input television signal by delaying the time required to display the horizontal scanning line (line), the coefficient units 4a and 4b, and the adder 5, between adjacent lines in the field. A first interpolation line generation unit is formed that generates a first interpolation line from an adjacent line in the original field based on the correlation. The 1-line delay memory 2a, 261-line delay memory 3a, and 1-line delay memory 8a
A second interpolation line generation unit that generates a second complementary line from the preceding and following fields based on the correlation between adjacent frames is formed.

That is, assuming that 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 shown in FIG. The output terminal of the 1-line delay memory 2a has the immediately preceding line in this even field, that is, 2n-2.
The pixel signal β on the second line will appear. Here, one line in the one-line delay memory 2a means one line in the original field to be subjected to progressive scan conversion, which is two lines in one field after progressive scan conversion composed of the original field and the interpolation field. Equivalent to. The same applies to the meaning of one line of the 261 line delay memory 3a with respect to the 263 line delay memory 1a.

In FIG. 2, the line indicated by the solid line is a line forming the original field appearing at the input terminal of the 1-line delay memory 2a, and the line indicated by the dotted line is a field appearing one field before or after the original field. ,
This is also the line that composes the interpolation field generated from the original field. The output terminal of the 261 line delay memory 3a has 2n + 1 in the odd field one field before.
The pixel signal γ on the second line appears.

If the coefficient values of the coefficient units 4a and 4b are b1, the pixel signal output from the adder 5; θ1 = b1 (α + β) is the pixel signal θ line on the 2n−1th line in the interpolation odd field. It becomes the first complementary pixel signal generated from the adjacent line based on the inter-correlation. Further, the pixel signal γ output from the 261 line delay memory 3a is doubled by the coefficient unit 6 and delayed by 1 line in the 1 line delay memory 8a; θ2
= 2γZ ⁻¹ is the second complementary pixel signal generated from the immediately preceding field based on the interfield correlation for the pixel signal θ on the 2n−1th line in the interpolation odd field.

The synthesis control unit including the coefficient units 4a, 4b, 9a and the adder 11 determines the first interpolation pixel signal θ1 and the second interpolation pixel signal θ2 according to the magnitude of motion on the display screen. The composition ratio is dynamically changed to perform composition. This synthesis ratio is dynamically changed by the coefficient generated by the coefficient generation unit 14 according to the magnitude of the motion output from the motion detection circuit 13.

That is, the difference signal ΔF between the adjacent frames output from the subtractor 12 is supplied to the motion detection circuit 13 as a signal indicating the magnitude of the motion existing in the display screen. As shown in FIG. 3, the motion detection circuit 13 is composed of an absolute value circuit 51, comparison circuits 52, 53, 54, and a decoder 55.
The inter-frame difference signal ΔF supplied to the input terminal 1 is supplied to one input terminal of each of the three comparison circuits 52, 53, 54 via the absolute value circuit 51. The reference values A, B, and C that sequentially increase are supplied to the other input terminals of the comparison circuits 52 to 54, and the comparison results x, y, and z are supplied to the decoder 55.

As shown in FIG. 5, the absolute value of ΔF is less than the reference value A, is the reference value A or more and less than B, or is the reference value B or more and C
Depending on whether it is less than or equal to or more than the reference value C, four kinds of comparison results (xyz) are supplied to the decoder 55, and a 2-bit binary signal is output from the decoder 55 which receives them. , To the coefficient generation circuit 14.

As shown in FIG. 4, the coefficient generation circuit 14 includes a 1-line delay memory 61, a maximum value selection circuit 62, coefficient generators 63, 64,
It consists of 65 and. The coefficient generation circuit 63 generates the coefficients a0 and b1 illustrated in FIG. 5 from the 2-bit decoder output supplied from the input terminal I through the I line delay memory 61, and respectively generates the coefficient units 4a, 4b and the coefficient unit 4a and 4b. Supply with 9a.

Therefore, b1 / a0 becomes zero in a still image in which the difference signal ΔF between adjacent frames is smaller than the reference value A or in a state close to this, and the interpolation field is generated only by the second interpolation line generated from the preceding and following fields based on the correlation between frames. Is generated and supplied to the time axis compression circuit via the output terminal O2.
On the contrary, a0 / b1 becomes zero when the difference signal ΔF between adjacent frames is larger than the reference value C, and only a first complementary line generated based on the correlation between adjacent lines in the field compensates. The function field is generated. Then, in an intermediate state between the above two states, the first and second combined images are combined based on the combination ratio that is changed according to the magnitude of the movement.
Interpolation lines generate interpolation fields.

As described above, if the motion is small, the interpolated field is generated mainly by the inter-frame correlation, so that the deterioration of the resolution in the vertical direction when the inter-line correlation is mainly performed can be effectively prevented. Further, if the motion is large, the interpolated field is generated mainly based on the line correlation, thereby effectively preventing the double image disturbance due to the motion.

The output from the subtractor 31, Δα = 2α− (2γ + θ2) / 2 = 2α−γ (1 + Z ⁻¹ ) is a non-linear circuit as a vertical contour complementing signal for the pixel signal α on the 2n-th line in the original field. Non-linear processing is performed in 34a, a coefficient corresponding to the motion is multiplied in the coefficient unit 35a, and then the pixel signal α for the contour compensation is combined in the adder 42.

Similarly, the output from the subtractor 32, Δθ = θ2− (α + β) = 2γZ ⁻¹ − (α + β), is a nonlinear contour compensation signal for the pixel signal θ on the 2n−1th line in the interpolation field Circuit 34b
Then, non-linear processing is performed, and the coefficient unit 35b multiplies the coefficient according to the motion, and then the adder 43 combines the pixel signal θ for contour compensation.

The coefficient (1-Kr) of the coefficient unit 35a and the coefficient (1-ki) of the coefficient unit 35b are illustrated in FIG. 5 by the coefficient generators 65 and 64 in the coefficient circuit 14 shown in FIG. It is generated as a value according to the magnitude of such movement. That is, when the difference signal ΔF between adjacent frames is smaller than the reference value A and is a still image or close to this, both the coefficients (1-kr) and (1-ki) are 1 and depending on the outputs of the nonlinear circuits 34a and 34b. Maximum contour compensation is applied. Conversely, the difference signal ΔF between adjacent frames
Is larger than the reference value C and the movement is large, the coefficient (1
Both −kr) and (1-ki) are 0, and no contour compensation is performed. In a state intermediate between the above two states, contour compensation is performed with a size that is reduced according to the size of the motion.

As described above, the contour compensation using the contour compensation signal generated from the adjacent line in the complementary field generated based on the inter-frame correlation is weakened in accordance with the magnitude of the motion of the display screen, so that the motion It is possible to effectively prevent the deterioration of the contour compensation characteristic due to the double image disturbance.

As shown in the block diagram of FIG. 6, the non-linear circuits 34a and 34b of FIG. 1 have a sign discriminating circuit 71, an absolute value circuit 72, a coring circuit 73, a slope setting circuit 74, a limiter circuit 75, and an encoding circuit 76. It consists of The contour compensation signal supplied to the input terminal I is based on a coring process for removing noise of a small signal level as shown in the input / output characteristic diagram of FIG. 7, and a gain control for adjusting the degree of contour enhancement. Non-linear processing including limiter processing for preventing whiteout due to excessive inclination setting and contour compensation is performed, and the result is supplied from the output terminal O to the coefficient units 35a and 35b.

FIG. 8 is a block diagram showing the configuration of a television signal progressive scan conversion apparatus according to another embodiment of the present invention. In the figure, the constituent elements designated by the same reference numerals as those in FIG. 1 are the same constituent elements as those already described with respect to the apparatus of the embodiment of FIG. 1, and duplicate description thereof will be omitted.

The difference between the progressive scan conversion apparatus shown in FIG. 8 and the progressive scan conversion apparatus of FIG. 1 is that it is perpendicular to the second interpolation line generation unit that generates interpolation lines from the preceding and following fields based on the correlation between adjacent frames. Directional high-pass filtering circuit is formed. This vertical high-pass filtering circuit is composed of 1-line delay memories 8a and 8b, coefficient units 9a, 9b and 9c,
And an adder 10.

The pixel signal 2γ output from the coefficient unit 6 is delayed by one line by the one-line delay memories 8a and 8b connected in cascade, and as shown in FIG. 9, the pixel signal θ = 2γZ on the 2n + 1st and 2n + 3th lines. ^-1 and i = 2γZ ^-2 . The three types of pixel signals delayed by one line are processed by coefficient units 9a, 9b, and 9c as coefficients a0 having opposite polarities as illustrated in FIG.
After being multiplied by a1 and then combined by the adder 10,
The interpolation signal Θ = 2γ (a1 + a0Z ^-1 + a1Z ^-2 ) that has been subjected to the high-pass filtering process is supplied to one input terminal of the adder 11.

FIG. 11 is a block diagram showing the structure of a television signal progressive scan conversion apparatus according to still another embodiment of the present invention. In this figure, the constituent elements denoted by the same reference numerals as in FIG. 1 and FIG. 8 are the same constituent elements that have already been described with respect to the apparatus of the embodiment shown in these figures, and therefore duplicated description thereof is omitted. The description will be omitted.

The progressive scan conversion device shown in FIG. 11 differs from the progressive scan conversion device of FIG. 8 in the following two points.

(I) For each of the original field and the interpolation field, a circuit for generating a vertical contour compensation signal by using only adjacent lines in the original field, and a circuit for generating only this vertical contour compensation signal and adjacent lines in the interpolation field A point is provided with a motion adaptive synthesis circuit for synthesizing the conventional vertical contour compensation signal with the ratio k and (1-k) which are dynamically changed according to the magnitude of motion in the screen.

(Ii) The first interpolation line generator is provided with vertical low-pass filtering circuits for three adjacent lines.

The adder 22, the coefficient unit 24, the subtracter 26, and the non-linear circuit 27b generate the contour compensation signal for the original field using only the adjacent lines in the original field. That is, as shown in FIG. 12, if the pixel signal to be contour-compensated in the original field is α, the pixel signal β of one line before is output from the adder 22.
And the sum (β + δ) of the pixel signal δ after one line is output. The subtracter 26 converts the pixel signal 2α supplied via the coefficient unit 24 that gives a fixed coefficient value 2 from the pixel signal (β +
δ) is subtracted, and the second contour compensation signal Δ ₂ α = 2α− (β + δ) generated from only the adjacent line in the original field with respect to the pixel signal α in the original field is output.

Similarly, the adders 21 and 23, the subtractor 25, and the non-linear circuit 27a are
The contour compensation signal for the interpolation field is generated only from the adjacent lines in the original field. That is, as shown in FIG. 12, if the pixel signal of the contour compensation target in the interpolation field is θ, the pixel signal β half line before is output from the adder 21.
And the sum (α + β) of the pixel signals α after the half line is output. The adder 23 outputs the sum (ζ + δ) of the pixel signal δ one and a half lines after and the pixel signal ζ one and a half lines before. The subtractor 25 subtracts the pixel signal (δ + ζ) from the pixel signal (α + β) to generate a second signal generated from only the adjacent line in the original field with respect to the pixel signal θ in the interpolation field.
The contour compensation signal Δ ₂ θ = (α + β) − (δ + ζ) is output.

On the other hand, the subtractor 31 outputs the first contour compensation signal Δ ₁ α for the pixel signal α in the original field generated based on the adjacent line in the interpolation field, and the subtractor 32 outputs the adjacent line in the original field. The first contour compensation signal Δ ₁ θ corresponding to the pixel signal θ in the interpolation field generated based on Further, the coefficients kr and ki corresponding to the magnitude of the motion shown in FIG. 13 are generated by the coefficient generation circuit 14 and supplied to the coefficient units 28a and 28b, respectively. Therefore, the adder 40
Outputs a contour compensation signal for the pixel signal α in the original field, Δα = (1-kr) Δ ₁ α + krΔ ₂ α, and supplies it to the adder 42.

Further, the pixel signal θ in the interpolation field is output from the adder 41.
A contour compensation signal for Δθ = (1−ki) Δ ₁ θ + krΔ ₂ θ is output and supplied to the adder 43.

Therefore, kr / (1-kr) is also k when a still image in which the difference signal ΔF between adjacent frames is smaller than the reference value A or a state close to this is k.
i / (1-ki) is also zero, and contour compensation is performed only by the contour compensation signal generated by using the adjacent line in the complementary field generated from the preceding and following fields based on the inter-frame correlation, and rich in high frequency components. Clear contour compensation is possible. On the contrary, when the difference signal ΔF between adjacent frames is larger than the reference value C and the movement is large, (1-kr) / kr also becomes (1
-Ki) / ki also becomes zero, and the contour compensation is performed only by the contour compensation signal generated by using the neighboring line in the interpolation field generated based on the correlation between the neighboring lines in the field. Image interference is effectively prevented. Then, in an intermediate state between the above two states, the contour compensation for each of the original field and the interpolation field is performed by the first and second contour compensation signals that are synthesized based on the synthesis ratio that is changed according to the magnitude of the motion. Is done.

Further, in the progressive scan conversion device illustrated in FIG.
As illustrated in the figure, the coefficient b1 that is changed according to the magnitude of the motion is generated by the coefficient generation circuit 14, and the coefficient unit in the vertical low-pass filtering circuit formed in the first interpolation line generation unit. Supplied to 4b and 4c. The coefficient b2 illustrated in FIG. 13 generated by the coefficient generation circuit 14 is supplied to the coefficient units 4a and 4d in the vertical low-pass filter circuit. Since these coefficients b1 and b2 have the same polarity as each other, vertical low-pass filtering processing is performed on adjacent lines in the four original fields before and after the 2n + 1th line in the interpolation field shown in FIG. Is done.

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

(Effects of the Invention) As described in detail above, the progressive scanning conversion apparatus for television signals according to the first invention is configured such that progressive scanning conversion by motion adaptive control and vertical contour compensation are performed simultaneously by a common apparatus. Therefore, the amount of hardware such as the line memory and the adder / subtractor and the installation space are reduced, and the image quality improving apparatus as a whole is inexpensive and compact.

Further, there is an advantage that the processing time is shortened with the simultaneous processing, a delay circuit for adjusting the delay amount with the audio system is not required, and the hardware amount is further reduced.

Further, in the progressive scan conversion apparatus of the present invention, the second interpolation line based on the inter-frame correlation is generated not by using the average value of the pixel signals of the preceding and following fields but by using the pixel signal of the immediately preceding field as it is. , It is possible to effectively avoid the delay of one field due to the processing. Therefore, it becomes easier to adjust the delay amount with the audio system.

Since the television signal progressive scan conversion device according to the second aspect of the present invention is configured to perform motion adaptive control not only for the progressive scan conversion process but also for the vertical contour compensation process, an optimum image quality according to the situation of the display screen is obtained. The effect is always expressed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a front stage portion of a time base compression circuit in a television signal progressive scan conversion apparatus according to an embodiment of the present invention, and FIG. 2 is appearing in each portion of FIG. FIG. 3 is a block diagram showing an example of the configuration of the motion detection circuit 13 shown in FIG. 1, and FIG. 4 is a diagram showing the coefficient generation circuit 14 shown in FIG. FIG. 5 is a block diagram showing an example of the configuration, FIG. 5 is a conceptual diagram for explaining an example of the operation of the circuits of FIGS. 3 and 4, and FIG. 6 is a configuration of the nonlinear processing circuits 34a, 34b of FIG. FIG. 7 is a block diagram showing an example, FIG. 7 is a conceptual diagram showing an example of input / output characteristics of the non-linear processing circuit of FIG. 6, and FIG. 8 is a block diagram showing a configuration of another embodiment of the sequential scanning device of FIG. , FIG. 9 is a conceptual diagram showing the mutual positional relationship in the display screen regarding the pixel signals appearing in the respective parts of FIG. Figure 10 is a conceptual diagram illustrating the relationship between the coefficient value and the motion coefficient unit in FIG. 8, FIG. 11 the second
FIG. 12 is a block diagram showing a configuration of a progressive scan conversion device according to an embodiment of the invention, FIG. 12 is a conceptual diagram showing a mutual positional relationship in a display screen with respect to pixel signals appearing in respective portions of FIG.
FIG. 13 is a conceptual diagram exemplifying the relationship between the coefficient value of the coefficient unit in FIG. 11 and the motion, FIG. 14 is a block diagram showing the configuration of a conventional progressive scan conversion device by motion adaptive control, and FIG. 15 is FIG. 14 is a conceptual diagram showing the mutual positional relationship in the display screen with respect to the pixel signals appearing in the respective parts of FIG. 14, and FIG. 16 is a block diagram showing the configuration of a conventional vertical contour compensator. IN: Input terminals for progressive scan conversion target television signals, 2a, 2b, 2c, 3a, 8a, 8b ... Delay memory for delaying input signals by a predetermined number of lines, and outputting 5,7,10, 11 ... Adder / subtractor, 13 ... Motion detection circuit, 14 ... Coefficient generation circuit, 6, 2
4,33 …… Coefficient unit with fixed coefficient value, 27a, 27b, 34a, 34b …… Nonlinear processing circuit, 4a, 4b ,, 4c, 4d, 9a, 9b, 9c, 28a, 28b, 35a, 35
b …… Coefficient unit whose coefficient value is dynamically changed according to the magnitude of movement on the display screen, O1 …… Original field output terminal,
O2 …… Interpolation field output terminal, 51 …… Absolute value circuit,
52,53,54 …… Comparator, 55 …… Decoder, 61 …… 1 line delay circuit, 62 …… Fine value selection circuit, 63,64,65 …… Coefficient generation circuit.

Claims (5)

(57) [Claims] 1. A first interpolation line generating means for generating a first interpolation line from an adjacent line in an original field based on a correlation between adjacent lines in the field, and a first interpolation line generating means from the immediately preceding field based on a correlation between the adjacent fields. Second interpolating line generating means for generating the second interpolating line, and the first and second interpolating lines are already synthesized by dynamically changing the synthesis ratio according to the movement in the display screen. A motion adaptive synthesizing means for generating and outputting an interpolation field composed of an interpolation line group, and each line in the original field and two lines in the interpolation field separated by one line before and after each line in the original field. An original field vertical contour compensation signal generator that generates a vertical contour compensation signal for a line, and an original field that is separated by one line before and after each line in the interpolation field. The vertical contour compensation signal generator for the interpolation field that creates the vertical contour compensation signal for each line in the interpolation field from the two lines in the field, and the output of the vertical contour compensation signal generator for the original field in the display screen The output of the interpolation field vertical contour compensation signal generation unit is synthesized according to the increase of the motion in the display screen, and the synthesis control unit that synthesizes with the corresponding line in the original field while decreasing the synthesis ratio according to the increase of A progressive scanning conversion apparatus for a television signal, comprising: a combination control unit that combines the lines with corresponding lines in an interpolation field while reducing the ratio. 2. The second interpolation line generating means includes means for generating a second interpolation line while performing high-pass filtering processing in the vertical direction. A progressive scanning conversion device for television signals as described above. 3. A first interpolation line generating means for generating a first interpolation line from an adjacent line in an original field based on a phase between adjacent lines in the field, and a first interpolation line from a preceding field based on a correlation between the adjacent fields. Second interpolating line generating means for generating the second interpolating line, and the first and second interpolating lines are already synthesized by dynamically changing the synthesis ratio according to the movement in the display screen. A motion adaptive synthesizing means for generating and outputting an interpolation field composed of an interpolation line group, and a vertical line 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. A first vertical contour compensation signal generator for the original field that creates the contour compensation signal, and each line in the original field and the adjacent original fields before and after the line. A second vertical contour compensation signal generator for the original field, which generates a vertical contour compensation signal for each line in the original field from the line, and each line in the interpolation field and two lines in the original field adjacent before and after the line From the first vertical contour compensation signal generator for the interpolation field that creates the vertical contour compensation signal for each line in the interpolation field, and from the four lines in the original field adjacent before and after each line in the interpolation field The output of the second vertical contour compensation signal generator for the interpolation field for creating the vertical contour compensation signal for each line in the interpolation field and the outputs of the first and second vertical contour compensation signal generators for the original field are displayed. Vertical contour compensation for each line of the original field is performed by synthesizing while dynamically changing the synthesis ratio according to the movement in the screen. The output of the motion adaptive type synthesizing unit for synthesizing and outputting the compensation signal, and the output of the first and second vertical contour compensation signal generation units for the interpolation field is dynamically changed according to the motion in the display screen. And a motion adaptive type synthesizing unit for synthesizing and outputting vertical contour compensation signals for each line of the interpolation field by synthesizing while changing to. 4. The first interpolation line generating means comprises a low-pass filtering circuit for generating a first interpolation line while performing low-pass filtering processing in the vertical direction on adjacent lines before and after in the field. The progressive scanning conversion apparatus for a television signal according to claim 3, characterized in that. 5. The third interpolation line generating means comprises means for generating a second interpolation line while performing high-pass filtering processing in the vertical direction. Alternatively, the progressive scanning conversion device for television signals according to the fourth aspect.