JP2004236353A - Television receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To receive both an existing television method television signal and a digital broadcasting method television signal in a high-quality and high-resolution image without an interlace interference. <P>SOLUTION: A demodulated picture signal S3 of the existing television method is subjected to an interpolation process of motion adjustment in a MA scan converter 3 and a demodulated picture signal SV of the digital broadcasting method is subjected to an interpolation process of motion compensation with an motion information data S12 in a MC scan converter 6 to convert an interlace signal into a noninterlace signal and display it in the noninterlace mode on an image display 9. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a television receiver.

  In recent years, with the development of high-efficiency coding technology, it has become possible to transmit high-quality images at bit rates of several mega to several tens of mega, and research on applying this to digital broadcasting and digital CATV has been advanced. I have.

  In digital broadcasting and digital CATV, an image having a better S / N ratio can be received as compared with the current system, and high quality television images can be achieved. In addition, the aspect ratio is different from the current television system of 4: 3, and the aspect ratio is adopted to 16: 9, thereby realizing a wide TV image.

  However, in consideration of transmission efficiency and the like, the image is scanned in a two-to-one interlaced manner, as in the current television system. For this reason, in the reproduced image, similarly to the current television system, image quality disturbance due to interlace scanning, for example, interlace disturbance such as line flicker and pairing occurs. Then, there is a problem that the high image quality, which is a feature of digital broadcasting and digital CATV, is impaired by these interlace interferences.

JP-A-6-165128

  SUMMARY OF THE INVENTION An object of the present invention is to provide a television receiver capable of receiving television signals such as digital broadcasting and digital CATV in high quality and high definition images, and capable of receiving television signals of the current television system with high image quality. Is to do.

  According to the present invention, in order to achieve the above object, the image display unit performs image display in a sequential scanning form. Scan conversion from interlaced scanning to progressive scanning is performed using a motion vector signal obtained by decoding a video coded signal in a television signal such as a digital broadcast or a digital CATV. Are generated by motion compensation interpolation processing. In addition, in the case of a television signal of the current television system, an interpolation signal is generated by motion-adaptive interpolation processing as in the related art.

  Conventionally, as a technique for avoiding interlace interference, a signal of a scanning line lost in interlace scanning is generated by interpolation processing, scan conversion is performed from interlace scanning to progressive scanning, and the signal of the progressive scanning is displayed on an image display unit. Is known. An example in which the present invention is applied to a television signal of the current television system includes a motion adaptive interpolation process. In this method, an interpolation signal is generated by changing a mixing ratio of an interpolation signal suitable for a still image and an interpolation signal suitable for a moving image in accordance with the motion of the image. However, motion must be detected from the received television signal. Depending on the motion, erroneous detection or omission of detection may occur, which may cause deterioration in image quality.

  On the other hand, in television signals such as digital broadcasting and digital CATV, inter-frame predictive coding for motion compensation is employed. For this reason, the video coded signal includes information on image motion such as a motion vector signal and a prediction error signal. Therefore, it is possible to perform scan conversion from interlaced scanning to sequential scanning by interpolation processing of motion compensation using these signals.

  For this reason, the present invention includes an intra-field interpolation unit that generates an interpolation signal from a signal of the same field, and a motion compensation interpolation unit that generates an interpolation signal by performing motion compensation processing on a signal of an adjacent field. If the decoded motion vector signal is suitable for the motion compensation interpolation process, the interpolation signal is changed by changing the mixing ratio of the output signals of the intra-field interpolation unit and the motion compensation interpolation unit according to the magnitude of the prediction error signal. Generate. On the other hand, if the motion vector signal is inappropriate for the motion compensation interpolation processing, the output signal of the motion compensation interpolation unit and the output signal of the intra-field interpolation unit generated with the interpolated motion vector signal being zero according to the magnitude of the motion vector signal. To generate an interpolation signal.

  According to the present invention, compared with the conventional motion-adaptive interpolation processing, the motion-compensation interpolation processing can generate an ideal interpolation signal that more closely matches the motion of an image. Also, since the speed of the motion of the image is detected based on the magnitude of the motion vector signal and the interpolated signal is generated by changing the mixture ratio in accordance with the detected motion vector signal, the interpolation process according to the speed of the motion that matches the human visual characteristics is performed. it can. As a result, it is possible to perform scan conversion from interlaced scanning to sequential scanning with high quality and high definition image quality, which is extremely difficult to achieve with conventional motion adaptive interpolation processing. Then, a high-quality image in which interlace interference is eliminated can be received.

  In addition, the motion vector signal enables more accurate image motion detection without erroneous detection or omission in comparison with conventional motion detection. By using this motion information, even in the conventional motion-adaptive interpolation processing, an interpolated signal that has a good variation in resolution between the still part and the moving image part, has less discomfort, and matches the human visual characteristics is generated. be able to. As a result, it is possible to realize scan conversion from interlaced scanning to progressive scanning with high quality and high definition image quality, and to receive a high quality image in which interlace interference is eliminated.

  According to the present invention, high-quality, high-definition television signals without interlace interference can be transmitted by using both the current television system and digital broadcasting such as digital broadcasting of a video coding signal with high efficiency coding or digital CATV. A television receiver that receives images can be obtained.

  A first embodiment of the present invention will be described with reference to the block diagram of FIG.

  The first television signal S1 undergoes a predetermined demodulation process in the baseband demodulation unit 1 to demodulate the composite color television signal S2 in the baseband. The video demodulation unit 2 performs predetermined demodulation processing such as YC separation and color demodulation. Further, signal processing for displaying an image on a screen having an aspect ratio of 16 to 9 is performed. For example, with respect to the current NTSC television signal, in order to display an image with an aspect ratio of 4 to 3 by providing a non-image area on the left and right sides of the screen, the time axis in the horizontal direction is increased by 3/4. Perform compression processing. In addition, with respect to a TV signal of the letterbox type EDTV system, a process of expanding the image in the main image area by 4/3 times in the vertical direction is performed in order to fully display the image. Then, the image signal S3 (the luminance signal and the two color difference signals) of the interlaced scanning is demodulated.

  The MA scan conversion unit 3 generates a signal of a scanning line that has been omitted in interlaced scanning by a conventional motion adaptive interpolation process. Then, the image signal S3 and the interpolation signal are compressed in the horizontal direction on the time axis to に and multiplexed in a time series to generate a sequentially scanned image signal S4 (a luminance signal and two color difference signals).

On the other hand, the second television signal S10 is subjected to a predetermined digital demodulation process in the channel decoding unit 4 to decode an encoded bit stream signal. Further, it performs a code error correction process and a correction process (replace a code error that cannot be corrected with a signal having a high correlation) to decode the video encoded signal S11. The video decoding unit 5 performs predetermined decoding processing, for example, variable-length code decoding, inverse quantization, transform coefficient decoding, and the like, and decodes image data of an encoded frame. Then, a conversion process of a predetermined image format is performed, and an interlaced scanning image signal SV (a luminance signal and two color difference signals) and motion information data S12 (a motion vector signal and a prediction error signal) are output. The MC scan conversion unit 6 generates a signal of a scanning line that has been dropped by interlaced scanning by interpolation processing for motion compensation using the motion information data S12. The details will be described later.
Then, the image signal SV and the interpolation signal are compressed in the horizontal direction on the time axis to に and multiplexed in a time series to generate a sequentially scanned image signal S13 (a luminance signal and two image difference signals).

  The selection unit 7 selects the image signal S4 for receiving the first television signal and the image signal S13 for receiving the second television signal, and outputs the selected signal to the output signal S5. The video processing unit 8 performs signal processing of a predetermined matrix operation, and converts the signals into RGB signals of three primary colors. Then, three primary color image signals S6 (R, G, B signals) are generated. This signal is displayed on the image display section 9 in an aspect ratio of 16: 9 in the form of sequential scanning, and a high-quality and high-definition television image is received.

  Hereinafter, the MC scan conversion unit 6 in the present embodiment will be described in detail.

  FIG. 2 is this first block diagram. It is composed of an intra-field interpolation unit 10, a motion compensation interpolation unit 11, a coefficient weighting unit 12, an addition unit 13, a delay unit 14, a time series multiplexing unit 15, and an MC control unit 16. Scan conversion is performed.

  The intra-field interpolation unit 10 converts the signal of the scanning line missing in the interlaced scanning into an arithmetic processing of the signal of the scanning line in the same field of the image signal SV (for example, the average value of the signals of the adjacent upper and lower scanning lines). An interpolation signal S20 is generated.

  The motion compensation interpolation unit 11 selects a pair of scan line signals suitable for motion compensation interpolation processing from the scan line signals of the previous and next fields adjacent to the image signal SV with the interpolation motion vector signal IV, as described later. Then, an interpolation signal S21 is generated with an average value of these signals.

The coefficient weighting units 12-1 and 12-2 weight the interpolation signals S20 and S21 with the coefficient values of the mixing ratio coefficients k and 1-k (0 < k < 1). Then, the addition unit 13 performs addition of the coefficient-weighted signals to generate a motion compensation interpolation signal S22.

  The delay unit 14 corrects a time delay generated in the signal processing for generating the motion compensation interpolation signal, and generates an image signal S23 having the same time delay. Then, the time-series multiplexing unit 15 compresses the signals S23 and S22 in the horizontal direction to 1/2 the time axis, multiplexes the signals in a time-series manner, and generates a sequentially-scanned image signal S13.

  Further, the MC control unit 16 generates the interpolation motion vector signal TV and the mixing ratio coefficients k and 1-k based on the motion vector signal MV and the prediction error signal PE of the motion information data S12, as described later.

Now, an outline of generation of an interpolation motion vector will be described with reference to FIG. The figure shows a case where the motion of the image is in the vertical direction. Scanning line white circles transmitted in interlaced scan in the drawing, a black circle represents an interpolated scanning line, also, V _i represents a motion vector of one frame obtained by the motion vector signal MV. The signal of the scanning line a in the field 1 moves to the position of the scanning line a in the motion vector V ₀ (still), the scanning line b in the V ₁ , and the scanning line c in the V ₂ in the field 3 after one frame period. In addition, the scanning line moves to the position of the scanning line d at V- ₁ and to the scanning line e at V- ₂ . Therefore, of the motion vector signals, the motion vectors (three types of V ₀ , V ₂ , V _{−2 in} the figure) crossing the interpolation scanning line can be used for the motion compensation interpolation processing. Therefore, for these motion vectors, as the interpolation motion vector signal IV, and it generates a signal V ₀ at IV = 0, V ₂ the IV = 1, V _-2 the IV = -1. On the other hand, among the motion vector signals, the motion vectors (two types of V ₁ and V _{−1 in} the figure) crossing the transmission scanning line cannot be used for the motion compensation interpolation processing. = 0 is generated.

  Next, the outline of generation of a motion compensation interpolation signal will be described with reference to FIG. This figure shows the case where the motion of the image is in the vertical direction, as in FIG. The signal of the interpolation scanning line α of the field 2 is generated from the signals of the field 1 and the field 3 before and after the signal adjacent thereto. That is, when the interpolation motion vector signal IV = 0, the scan line a of the field 1 and the scan line a 'of the field 3 are used. 1 scan line c and field 3 scan line c ', IV = -1 for field 1 scan line d and field 3 scan line d', IV = -2 for field 1 scan line e and field 3 scan The line e 'is selected as a signal of each pair of scanning lines. Then, an average value of these signals is used to generate an interpolated scanning line signal by interpolation processing for motion compensation.

  FIGS. 3 and 4 show the case where the motion of the image is in the vertical direction. However, when the motion is in the horizontal direction, the scanning of the same position as the interpolation scanning line α between the adjacent front and rear fields 1 and 3 is performed. Generated from the signal of the line pixel. That is, a signal of an interpolated scanning line is generated by an interpolation process of motion compensation using an average value of a signal of a pair of pixels of fields 1 and 3 selected by an interpolated motion vector signal. In the case of a movement in an oblique direction, interpolation processing for motion compensation is performed on the movement in the vertical direction and the movement in the horizontal direction to generate a signal of a desired interpolation scanning line.

FIG. 5 is a block diagram of the motion compensation interpolation unit 11 that performs the above-described motion compensation interpolation processing. The vertical compensation generation unit 17 includes a one-frame delay unit 19, a one-line delay unit 20, and a selection unit 21, and uses the interpolated motion vector signal IV for a pair used for motion compensation interpolation processing for vertical motion. It generates scanning line signals S30 and S31 (for example, signals of scanning line b 'of field 3 and scanning line b of field 1 in FIG. 4).
On the other hand, the horizontal compensation generation unit 18 includes a one-sample delay unit 22 and a selection unit 23, and generates a pair of pixel signals S32 used for interpolation processing of motion compensation for horizontal motion by using an interpolation motion vector signal IV. S33 and are generated. Then, the calculation unit 24 calculates the average value of the two signals S32 and S33, and generates an interpolation signal S21 at the output.

  If the motion vector signal MV cannot be used for the motion compensation interpolation processing, as described above, the processing is performed using the interpolation motion vector signal IV = 0 (still), and the processing is performed by the stationary unit in the conventional motion adaptive interpolation processing. A signal similar to a suitable interpolation signal is generated as an interpolation signal S21.

  FIG. 6 is an explanatory diagram of the operation in the MC control unit 16. FIG. 3A shows the operation of soft switch control for continuously changing the mixing ratio coefficient, and FIG. 4B shows the operation of on / off control for changing the ratio in a binary manner.

In the soft switch control shown in FIG. 3A, when the motion vector signal MV is suitable for interpolation processing of motion compensation (corresponding to the motion vectors V ₀ , V ₂ , and V _{-2 in} FIG. 3), Then, an interpolation motion vector signal IV is generated. Further, as shown in the characteristic (1) when the MV motion compensation interpolation is possible, the value of the mixture ratio coefficient is set according to the magnitude of the absolute value of the prediction error signal PE.

  That is, when | PE | is less than E1, the accuracy of the motion vector signal is high. Therefore, k = 0 is set, and the signal generated by the motion compensation interpolation processing is used. On the other hand, if | PE | is equal to or greater than E2, the accuracy of the motion vector signal is low, and it is highly likely that interpolation processing for motion compensation is performed with a motion different from the original motion of the image. Is used. In the region where | PE | is from E1 to E2, the component of the motion compensation interpolation process is mainly in the vicinity of E1, and the component of the interpolation process in the field is mainly in the vicinity of E2, depending on the value of | PE |. To change k from 0 to 1.

Next, when the motion vector signal MV is not suitable for the interpolation processing of the motion compensation (corresponding to the motion vectors of V ₁ and V _{-1 in} FIG. 3), the interpolation motion vector signal IV generates IV = 0 (still). I do. Further, as shown in the characteristic (2) when the MV motion compensation interpolation is not possible, the value of the mixture ratio coefficient is set according to the magnitude of the absolute value of the motion vector signal MV. That, | MV | In the movement of the stationary or very slow speed of the image below V _alpha, set k = 0, using the interpolation signal suitable for stationary portion generated by interpolation processing of the motion compensation of IV = 0 . Moreover, | MV | in motion of V _beta more rapid rate of the image, is set to k = 1, using a signal generated by the interpolation processing in a field suitable for moving image part. On the other hand, | MV | is in the region of from V _alpha V _beta is, | changes the k in accordance with a value from 0 to 1 | MV. This makes it possible to perform a motion adaptive interpolation process according to the speed of the motion of the image.

In the on / off control shown in FIG. 3B, when the motion vector signal MV is suitable for the interpolation processing of the motion compensation, the interpolation motion vector signal IV is generated from the motion vector signal, and the mixing ratio coefficient is the MV motion compensation of (1). As shown when interpolation is possible, k = 0 when the prediction error signal | PE | is less than E1, and k = 1 when the prediction error signal | PE | is greater than E1. On the other hand, if the motion vector signal MV is not suitable for the interpolation process of motion compensation, an interpolated motion vector signal IV = 0 is generated, and the mixture ratio coefficient is calculated as shown in (2) when MV motion compensation interpolation is not possible. vector signal | MV | less than the V _alpha is at k = 0, _V α or set to k = 1, interpolation is performed for motion-adaptive in response to the speed of movement of the image. However, in the on / off control, in some cases, the image quality is deteriorated due to the fluctuation of the mixing ratio coefficient.
Therefore, it is desirable to perform soft switch control from the viewpoint of image quality.

  As described above, according to FIG. 2, based on the motion vector signal, the interpolation scanning matched to the motion of the image is performed by the interpolation process of the motion compensation using the interpolated motion vector signal and the interpolation process of the motion adaptation according to the speed of the motion. A line signal can be generated.

  Next, FIG. 7 shows a second block diagram of the MC scan conversion unit 6 of the present embodiment. It is composed of an intra-field interpolation unit 10, a motion compensation interpolation unit 11, a coefficient weighting unit 12, an addition unit 13, a delay unit 14, a time series multiplexing unit 15, a mode setting unit 25, and an MC control unit 26. In the processing, scan conversion from interlaced scanning to sequential scanning is performed.

  The intra-field interpolation unit 10 generates an interpolation signal S20 by performing arithmetic processing on signals of scanning lines in the same field of the image signal SV, and the motion compensation interpolation unit 11 generates scanning signals of adjacent fields before and after the image signal SV. The interpolation signal S21 is generated by the motion compensation processing of selecting the signal of the above with the interpolation motion vector signal IV.

The coefficient weighting units 12-1 and 12-2 weight the coefficient values of the mixture ratio coefficients k and 1-k (0 < k < 1), add the two signals weighted by the addition unit 13 and add A compensation interpolation signal S22 is generated.

  The delay unit 14 adjusts a time delay generated in the signal processing, and generates an image signal S23 having the same time delay. The time-series multiplexing unit 15 compresses the signals S23 and S22 in the horizontal direction to 1/2 the time axis, multiplexes the signals in a time-series manner, and generates a sequentially-scanned image signal S13.

  The mode setting unit 25 sets the mode of the interpolation process as described later based on the motion vector signal MV of the motion information data S12, and sets the first interpolation mode (interpolation process similar to the first configuration example described above). Generates a mode signal MOD of L and H in the second interpolation mode. Then, the MC control unit 26 generates the interpolation motion vector signal IV and the mixing ratio coefficients k and 1-k based on the motion vector signal MV and the prediction error signal PE according to the mode signal MOD.

FIG. 8 is a block diagram of the mode setting unit 25. The main scanning line signal interpolation unit 27 performs a motion compensation interpolation process based on a motion vector (for example, V ₁ , V _{−1 in} FIG. 3) of the motion vector signal MV that crosses the transmission scanning line. A transmission scan line interpolation signal SV 'is generated. The operation unit 28 performs a subtraction operation between the image signal SV of the scanning line at the same position and the transmission scanning line interpolation signal SV 'to generate an error signal ER.

When the motion vector signal has high accuracy, the transmission scanning line interpolation signal SV 'is almost the same as the image signal SV, and thus the error signal ER is a signal having almost zero component.
On the other hand, if the accuracy of the motion vector signal is low, the component of the error signal ER becomes large. Therefore, the accuracy of the motion vector signal can be verified based on the magnitude of the component of the error signal ER.

  Therefore, the determination unit 29 verifies the accuracy of the motion vector signal based on the magnitude of the absolute value of the error signal ER. When the threshold value is less than the threshold Th, a first interpolation mode for performing motion compensation interpolation processing based on the motion vector signal, and when the threshold value is equal to or greater than the threshold Th, a second interpolation mode for performing motion adaptive interpolation processing according to the speed of the motion. And a mode signal MOD corresponding to this is generated.

FIG. 9 is an explanatory diagram of the operation of the MC control unit 26. FIG. 7A shows the operation in the second interpolation mode in which the MOD signal is H. In this mode, since the interpolation processing of the motion adaptation according to the speed of the motion is performed, the interpolation motion vector signal IV is set to IV = 0 (still) so that the motion compensation interpolation unit 11 generates an interpolation signal suitable for the stationary unit. Generate a signal of The mixing ratio factor, depending on the magnitude of the absolute value of the motion vector signal MV, is less than V _alpha increases from 0 from k = 0, V _alpha to V _beta continuously to 1, k is a V _beta or = 1 is generated.

FIG. 11B shows the operation in the first interpolation mode in which the MOD signal is L. When the motion vector signal MV is suitable for the motion compensation interpolation process (corresponding to the motion vectors V ₀ , V ₂ , V _{−2 in} FIG. 3), the motion vector signal is used to generate an interpolation motion vector signal IV. Further, like the characteristic (1) when the MV motion compensation interpolation is possible, the mixing ratio coefficient is k = 0 when E1 is less than E1 and 0 when E1 to E2 according to the magnitude of the absolute value of the prediction error signal PE. From 1 to 1, and when E2 or more, a coefficient value of k = 1 is generated.
On the other hand, if the motion vector signal is inappropriate for the motion compensation interpolation processing (corresponding to the motion vectors V ₁ and V _{-1 in} FIG. 3), the interpolation motion vector signal IV generates IV = 0.
Further, like the characteristic (2) when the MV motion compensation is not possible, the mixture ratio coefficient varies from k = 0, V _α to V _β when V is less than V _α according to the magnitude of the absolute value of the motion vector signal MV. increases from 0 continuously to 1, the V _beta or generating a coefficient value of k = 1.

  As described above, according to the second configuration example, when the accuracy of the motion vector signal is high, the interpolation process of the motion compensation is performed, and when the accuracy of the motion vector signal is low, the interpolation process of the motion adaptation according to the speed of the motion is performed. It is possible to generate an interpolated scanning line signal that matches the motion.

  Next, FIG. 10 shows a third configuration example of the MC scan conversion unit 6 of the present embodiment. It is composed of an intra-field interpolation unit 10, a motion compensation interpolation unit 30, a coefficient weighting unit 12, an addition unit 13, a delay unit 14, a time series multiplexing unit 15, and an MC control unit 31, which performs motion adaptation according to the speed of motion. In the interpolation processing, scan conversion from interlaced scanning to sequential scanning is performed.

  The intra-field interpolation unit 10 generates an interpolation signal S20 by performing arithmetic processing on signals of scanning lines in the same field of the image signal SV. The motion compensation interpolation unit 30 generates an interpolation signal S24 suitable for a stationary portion with an interpolation motion vector signal IV = 0, using a signal of a scanning line of a previous and next field adjacent to the image signal VS.

The coefficient weighting units 12-1 and 12-2 weight the coefficient values of the mixture ratio coefficients k and 1-k (0 < k < 1), add the two signals weighted by the addition unit 13 and add A compensation interpolation signal S22 is generated.

  The delay unit 14 adjusts the time delay generated in the above-described signal processing, and generates an image signal S23 having the same time delay. The time-series multiplexing unit 15 compresses the signals S22 and S23 in the horizontal direction to 1/2 the time axis, multiplexes the signals in a time-series manner, and generates a sequentially-scanned image signal S13.

  The MC control unit 31 generates the mixing ratio coefficients k and 1-k based on the motion vector signal MV of the motion information data S12.

FIG. 11 is an explanatory diagram of the operation of the MC control unit 31. Depending on the magnitude of the absolute value of the motion vector signal MV, it is less than V _alpha continuously increases from zero from k = 0, V _alpha to V _beta to 1, the V _beta or generating a coefficient value of k = 1 . Incidentally, in addition to the characteristics of the soft switch control, such as shown in the figure, less than V _alpha is at k = 0, V _alpha or can generate a coefficient value by the characteristics of the on-off control of k = 1.

  As described above, according to FIG. 10, by performing the motion adaptive interpolation processing according to the motion speed using the motion vector signal, it is possible to generate an interpolated scanning line signal that matches the motion of the image.

  The other blocks in this embodiment can be easily realized by the conventional technology.

  According to the present embodiment, interpolation processing of motion adaptation is performed on the first television signal, and interpolation processing of motion compensation is performed on the second television signal using the motion information data of the video coded signal. , A television receiver that receives a high-quality, high-definition television image without interlace interference can be realized.

  Next, a second embodiment of the present invention will be described with reference to a block diagram shown in FIG.

  The first television signal S1 undergoes a predetermined demodulation process in the baseband demodulation unit 1 to demodulate the composite color television signal S2 in the baseband. The video demodulation unit 2 performs predetermined demodulation processing such as YC separation and color demodulation. In addition, signal processing for displaying an image on a screen having an aspect ratio of 16: 9, for example, with respect to the current NTSC television signal, an image having an aspect ratio of 4: 3 is displayed on the left and right sides of the screen. In order to provide a partial area for display, processing for compressing the time axis in the horizontal direction by 3/4 is performed. Then, the image signal S3 (the luminance signal and the two color difference signals) of the interlaced scanning is demodulated. This signal is supplied to the motion detection unit 32, and the motion information MD is detected based on, for example, the presence or absence of a difference signal between frames.

  On the other hand, the second television signal S10 performs a predetermined digital demodulation process in the channel decoding unit 4, and decodes the encoded bit stream signal. Further, it performs a code error correction process and a correction process (replace a code error that cannot be corrected with a signal having a high phase) to decode the video encoded signal S11. The video decoding unit 5 performs predetermined decoding processing, for example, variable-length code decoding, inverse quantization, transform coefficient decoding, and the like, and decodes image data of an encoded frame. Then, a conversion process of a predetermined image format is performed, and an interlaced scanning image signal SV (a luminance signal and two color difference signals) and a motion vector signal MV of motion information data are output.

  The selection unit 33 outputs the image signal S7 when receiving the first television signal and outputs the image signal SV when receiving the second television signal to the image signal S7. Further, as the motion signal MI, motion information MD is output when the first television signal is received, and a motion vector signal MV is output when the second television signal is received.

  The MA scan conversion unit 34 generates a signal of a scan line that has been dropped in the interlace scan by a motion adaptive interpolation process according to the motion signal MI, performs a scan conversion process from the interlace scan to the sequential scan, and An image signal S8 (a luminance signal and two color difference signals) is generated. Then, the video processing unit 8 performs signal processing of a predetermined matrix operation, and converts the signal into an image signal S6 of three primary colors, RGB. This signal is displayed on the image display section 9 in the form of progressive scanning with an aspect ratio of 16: 9 to receive a high-quality and high-definition television image.

  FIG. 13 is an explanatory diagram of the MA scan conversion unit 34. As shown in FIG. 1A, the inter-field interpolation unit 10, the inter-field interpolation unit 35, the coefficient weighting unit 12, the addition unit 13, the delay unit 14, the time-series multiplexing unit 15, and the coefficient setting unit 36 are provided. I do.

  The intra-field interpolation unit 10 generates an interpolation signal S40 suitable for a moving image portion by performing arithmetic processing (for example, averaging the signals of the upper and lower scanning lines) on the signals of the scanning lines in the same field of the image signal S7. The inter-field interpolation unit 35 generates an interpolation signal S41 suitable for a stationary unit by performing a calculation process on signals of scanning lines of adjacent fields before and after.

The coefficient weighting units 12-1 and 12-2 weight the coefficient values of the mixing ratio coefficients k and 1-k (0 < k < 1), add the two signals weighted by the addition unit 13, and perform motion adaptation. Is generated.

  The delay unit 14 adjusts the time delay generated in the above-described signal processing, and generates an image signal S43 having the same time delay. Then, the time-series multiplexing unit 15 compresses the signals S42 and S43 in the horizontal direction to 1/2 the time axis, multiplexes the signals in a time-series manner, and generates a sequentially-scanned image signal S8.

FIG. 6B is a characteristic example of the mixing ratio coefficient. For the first television signal, as shown in (1), depending on the magnitude of the absolute value of the motion information MD, k = 0 for less than M1, and 0 to 1 continuously from M1 to M2. And a coefficient value of k = 1 is generated for M2 and above. On the other hand, for the second television signal, as shown in (2), in response to the magnitude of the absolute value of the motion vector signal MV, from the less than V α _k = 0, V α to V _beta 0 From 1 to 1, and when V _β or more, a coefficient value of k = 1 is generated. As a result, the adaptive processing according to the speed of the movement can be realized, and the interpolation processing conforming to the visual characteristics can be performed.

  The other blocks in this embodiment can be easily realized by the conventional technology.

  According to the present embodiment, by performing motion adaptive interpolation processing for the first television signal and performing motion adaptive interpolation processing based on the motion speed for the second television signal, interlace interference is prevented. A television receiver that receives a high-quality, high-definition television image with extremely little image quality can be realized.

In the embodiment, the setting parameters of the mixing ratio coefficient (for example, E1, E2, V _α , V _β , and M1, M2) can be set freely within a range that does not hinder practical use.

FIG. 2 is a block diagram of a first embodiment of the present invention. FIG. 2 is a first block diagram of an MC scan converter in FIG. 1. FIG. 3 is an explanatory diagram of generation of an interpolation motion vector according to the present invention. FIG. 4 is an explanatory diagram of generating a motion compensation interpolation signal according to the present invention. FIG. 3 is a block diagram of a motion compensation interpolation unit in FIG. 2. FIG. 3 is an explanatory diagram of the operation of the MC control unit in FIG. 2. FIG. 5 is a second block diagram of the MC scan conversion unit. FIG. 8 is a block diagram of a mode setting unit in FIG. 7. FIG. 8 is an explanatory diagram of the operation of the MC control unit in FIG. 7. FIG. 13 is a third block diagram of the MC scan conversion unit. FIG. 11 is an explanatory diagram of the operation of the MC control unit in FIG. 10. FIG. 6 is a block diagram of a second embodiment of the present invention. FIG. 13 is an explanatory diagram of an MA scan converter in FIG. 12.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 ... Baseband demodulation part, 2 ... Video demodulation part, 3 ... MA scan conversion part, 4 ... Channel decoding part, 5 ... Video decoding part, 6 ... MC scan conversion part, 7 ... Selection part, 8 ... Video process Part, 9 ... Image display part.

Claims (6)

A first television signal in which a carrier chrominance signal is superimposed on a luminance signal, and a second television signal of a video encoding signal in which high-efficiency encoding has been performed are processed by an image display section in a progressive scanning mode having an aspect ratio of 16: 9. In a television receiver for receiving an image, a signal of a scanning line which has been dropped by interlaced scanning is subjected to motion adaptive interpolation processing for the first television signal and motion compensation for the second television signal. A television receiver, wherein each of the television receivers is generated by an interpolation process of (1) and performs scan conversion from interlaced scanning to sequential scanning. In claim 1, the interpolation process of the motion compensation includes: an intra-field interpolation unit that generates an interpolation signal from a signal of the same field; and a motion compensation interpolation unit that generates an interpolation signal by a motion compensation process of a signal of an adjacent field. When the motion compensation interpolation is possible, the output signal of the intra-field interpolation unit and the output signal of the motion compensation interpolation unit are mixed according to the magnitude of the prediction error signal obtained by decoding the video encoded signal. If the interpolation signal is generated by changing the ratio and motion compensation interpolation is not possible, the output signal of the intra-field interpolation unit and the interpolation motion are calculated according to the magnitude of the motion vector signal obtained by decoding the video encoded signal. A television receiver for generating an interpolation signal by changing a mixing ratio of a vector signal and an output signal of the motion compensation interpolation unit having zero. 2. The motion compensation interpolation process according to claim 1, wherein the motion compensation interpolation processing includes: an intra-field interpolation unit that generates an interpolation signal from a signal of the same field; and a motion compensation interpolation that generates an interpolation signal of a signal of an adjacent field using a zero interpolation motion vector signal. Having an output signal of the intra-field interpolation unit and a mixing ratio of the output signal of the motion compensation interpolation unit according to the magnitude of the motion vector signal obtained by decoding the video encoded signal. A television receiver that is to generate an interpolation signal. 4. The mode setting unit according to claim 1, further comprising a mode setting unit configured to set a first interpolation mode and a second interpolation mode in accordance with the accuracy of a motion vector signal obtained by decoding a video encoded signal. A television receiver that generates an interpolation signal by the motion compensation interpolation process in the interpolation mode, and generates an interpolation signal by the motion compensation interpolation process in the second interpolation mode. A first television signal in which a carrier chrominance signal is superimposed on a luminance signal, and a second television signal of a video encoding signal in which high-efficiency encoding has been performed are processed by an image display unit in a progressive scanning mode having an aspect ratio of 16: 9. In a television receiver that receives images,
A signal of a scanning line lost in interlaced scanning is generated by motion adaptive interpolation processing, and means for performing scan conversion from interlaced scanning to sequential scanning is provided. A television receiver, wherein the first television signal is detected by a significant difference signal between a plurality of frames, and the second television signal is detected by a motion vector signal obtained by decoding a video coded signal. 6. The television receiver according to claim 1, wherein the video coded signal is a signal obtained by performing high efficiency coding by a combination of orthogonal transform coding and inter-frame predictive coding for motion compensation. .

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