WO2008059704A1 - Dispositif d'interpolation de ligne de balayage et procédé d'interpolation de ligne de balayage - Google Patents
Dispositif d'interpolation de ligne de balayage et procédé d'interpolation de ligne de balayage Download PDFInfo
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- 238000012545 processing Methods 0.000 claims description 90
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- 230000002265 prevention Effects 0.000 claims description 7
- 230000000694 effects Effects 0.000 abstract description 8
- 230000015556 catabolic process Effects 0.000 abstract 1
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- 238000010586 diagram Methods 0.000 description 13
- 230000006866 deterioration Effects 0.000 description 7
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T3/00—Geometric image transformations in the plane of the image
- G06T3/40—Scaling of whole images or parts thereof, e.g. expanding or contracting
- G06T3/4007—Scaling of whole images or parts thereof, e.g. expanding or contracting based on interpolation, e.g. bilinear interpolation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
- H04N7/0117—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level involving conversion of the spatial resolution of the incoming video signal
- H04N7/012—Conversion between an interlaced and a progressive signal
Definitions
- the present invention relates to a scanning line interpolation apparatus and a scanning line interpolation method for performing scanning line interpolation processing.
- the interpolation target pixel In a scanning line interpolation apparatus for performing scanning line interpolation processing such as conversion of an interlace (passing) scanned video signal into a progressive (sequential) scanned video signal, the interpolation target pixel There is a scanning line interpolation device having a function of determining the pixel value of an interpolation target pixel based on the correlation of at least two pixels located in a diagonal direction (hereinafter referred to as a diagonal interpolation function). According to the scanning line interpolation device having the oblique interpolation function, the oblique edge can be properly reproduced.
- the scanning line interpolation device having the oblique interpolation function as described above it is determined by the oblique interpolation process in order to suppress the image quality deterioration when a malfunction due to the oblique interpolation process occurs. If the pixel value is out of the range between the pixel values of the upper and lower adjacent pixels, the pixel value is corrected so that the pixel value falls within the range between the pixel values of the upper and lower adjacent pixels. See, for example, Patent Document 1).
- Patent Document 1 Japanese Patent Application Laid-Open No. 2002-185934
- FIG. 10 is a block diagram showing a configuration of a conventional scanning line interpolation device having a function of correcting the pixel value determined by the oblique interpolation processing as described above.
- the interpolation processing unit 10 generates an image signal (hereinafter referred to as an upper line image signal) of a scanning line one row above the pixel to be interpolated and an image of a scanning line one row below the pixel to be interpolated. Based on the signal (hereinafter referred to as a lower line video signal), the pixel value of the pixel to be interpolated is determined based on the correlation of two pixels located in the diagonal direction of the pixel to be interpolated.
- an image signal hereinafter referred to as an upper line image signal
- a lower line video signal Based on the signal (hereinafter referred to as a lower line video signal), the pixel value of the pixel to be interpolated is determined based on the correlation of two pixels located in the diagonal direction of the pixel to be interpolated.
- the interpolation value limiting unit 12 is configured to interpolate a pixel value determined by the interpolation processing unit 10 based on the pixel value determined by the interpolation processing unit 10, the upper line video signal, and the lower line video signal. Determine whether it is out of the range between the pixel values of the upper and lower adjacent pixels . If the pixel value determined by the interpolation processing unit 10 is out of the range between the pixel values of the adjacent pixels above and below the interpolation target pixel, the interpolation value limiting unit 12 is determined by the interpolation processing unit 10. The pixel value determined by the interpolation processing unit 10 is corrected so that the obtained pixel value falls within the range between the pixel values of the upper and lower adjacent pixels, and the corrected pixel value is output as a corrected video signal.
- the interpolation value limiting unit 12 determines the interpolation value determined by the interpolation processing unit 10. Output as a corrected video signal without correcting the pixel value
- FIG. 11 shows the relationship between the upper line video signal, the lower line video signal, and the desired interpolated video signal in a video signal having diagonal edges (boundary lines of colors running in a diagonal direction).
- a pixel value out of the range between the pixel values of the adjacent pixels above and below the pixel to be interpolated due to a malfunction due to the oblique interpolation processing (for example, “incorrect interpolation value” in FIG.
- the pixel value is corrected by the interpolation value limiting unit 12 so that it falls within the range between the pixel values of the adjacent pixels above and below the pixel to be interpolated as indicated by the arrow in FIG.
- the conventional scanning line interpolation device shown in FIG. 10 does not exhibit the effect of oblique interpolation processing in a specific case.
- FIG. 12 shows upper line video signals, lower line video signals, and desired interpolation video signals in a video signal having diagonal lines (pointing to thin lines running in the diagonal direction and being distinguished from the above-mentioned diagonal edges). Shows the relationship between In this case, a part of the curve indicating the desired interpolated video signal is out of the range between the pixel values of the adjacent pixels above and below the pixel to be interpolated. Therefore, with regard to this portion (portion in the “malfunction range” of FIG. 12), even if a normal pixel value is output from the interpolation processing unit 10, the arrow of FIG. As shown, the pixel value is erroneously corrected to be within the range between the pixel values of the adjacent pixels above and below the pixel to be interpolated.
- the scanning line interpolation process based on the scanning line A video signal (upper line video signal) and the scanning line C video signal (lower line video signal) performs scanning line interpolation processing.
- the case of generating the (interpolated video signal) will be described.
- the scanning line B in FIG. 13B indicates the pixel value output from the interpolation processing unit 10.
- the pixel value of the pixel B2 is an incorrect value due to a malfunction of the oblique interpolation processing, and the other pixel values are normal values.
- the scanning line B in FIG. 13C indicates the pixel value output from the interpolation value limiting unit 12.
- the pixel value of the pixel B2 is corrected by the interpolation value limiting unit 12 so that it falls within the range between the pixel values of the adjacent pixels above and below the pixel B2 (that is, the pixel A2 and the pixel C2). It will be closer to The pixel value of pixel B6 is incorrectly corrected by interpolation value limiter 12 so that it falls within the range between the pixel values of the adjacent pixels above and below pixel B6 (ie pixel A6 and pixel C6). It will As a result, as shown in FIG. 13C, the diagonal line is not properly interpolated.
- the present invention provides a scanning line interpolation device and a scanning line interpolation method in which the effect of oblique interpolation processing is sufficiently exhibited while suppressing the image quality deterioration due to a malfunction of oblique interpolation processing. With the goal.
- At least at least one of the pixels to be interpolated (Pi) is located in a diagonal direction.
- Interpolation processing means (10) for determining the pixel value of the interpolation target pixel based on the pixel value of two pixels, and the pixel value determined by the interpolation processing means adjacent to the top and bottom of the interpolation target pixel
- the interpolation Interpolation value limiting means (12) for correcting the pixel value determined by the processing means, the pixel value of the pixel on the scanning line above the interpolation object pixel and the scanning under the interpolation object pixel
- the interpolation value by selectively outputting the pixel value determined by the interpolation processing means or the pixel value corrected by the interpolation value limiting means as an interpolation video signal based on the pixel value of the pixel on the line Malfunction prevention means (14, 16) for preventing malfunction of the restriction means.
- the malfunction prevention means is a curve indicating the pixel value of the pixel on the scanning line above the interpolation target pixel when the horizontal position is the horizontal axis and the pixel value is the vertical axis, and the scanning line below the interpolation target pixel Intersection area detection means (14) for determining whether or not the interpolation target pixel is positioned in an intersection area which is an area in the vicinity of a horizontal position where a curve indicating the pixel value of the upper pixel intersects; According to the determination result of the means, for the interpolation target pixel determined not to be located in the intersection area, the pixel value corrected by the interpolation value restriction means is output as an interpolation video signal and determined to be located in the intersection area
- the interpolation target pixel may include a selection means (16) for outputting the pixel value determined by the interpolation processing means as an interpolation video signal.
- the intersection area detection means may detect the intersection area on the scanning line below the interpolation object pixel from the pixel value of the first pixel (Pul) located on the scanning line above the interpolation object pixel and to the left of the interpolation object pixel.
- the first subtraction result value (the sign of U and the scanning line above the pixel to be interpolated, which is the value obtained by subtracting the pixel value of the second pixel (Pdl) located at the same horizontal position as the first pixel.
- the pixel value of the fourth pixel (Pdr) located on the scanning line below the interpolation target pixel and at the same horizontal position as the third pixel It is determined whether the sign of the second subtraction result value (R) which is the value of the subtraction result is the same or not, and the sign of the first subtraction result value and the sign of the second subtraction result value are the same. It may be determined that the interpolation target pixel is not located in the intersection area.
- the crossing area detecting means has a sign of the first subtraction result value different from a sign of the second subtraction result value, and an absolute value of the first subtraction result value and an absolute value of the second subtraction result value. If both of the values are equal to or greater than a first threshold greater than 0, it may be determined that the pixel to be interpolated is located in the intersection area.
- the intersection area detection means has a sign of the first subtraction result value different from a sign of the second subtraction result value, and an absolute value of the first subtraction result value and an absolute value of the second subtraction result value. value Are both greater than or equal to a first threshold greater than 0, and both the absolute value of the difference between the first pixel and the third pixel and the absolute value of the difference between the second pixel and the fourth pixel are greater than 0. If it is not less than the second threshold, it may be determined that the interpolation target pixel is located in the intersection area.
- the malfunction prevention means determines whether or not a diagonal line exists in the vicinity of the pixel to be interpolated instead of a diagonal edge, and the detection result of the diagonal line detection means determines whether the diagonal line exists or not.
- the pixel value corrected by the interpolation value limiting means is output as an interpolated video signal for the interpolation target pixel determined to have no diagonal line in the vicinity thereof, and the interpolation target determined to have a diagonal line in the vicinity thereof.
- the pixel may include a selection unit that outputs the pixel value determined by the interpolation processing unit as an interpolation video signal.
- At least the diagonal line of the pixel to be interpolated (Pi) is located.
- the pixel value of the interpolation target pixel is the value between the pixel values of two pixels adjacent to the upper and lower sides of the interpolation target pixel when the pixel value is outside the range between the pixel values of (Pu, Pd)
- the interpolation value limiting step for correcting the pixel value determined in the interpolation processing step, the pixel value of the pixel on the scanning line above the interpolation target pixel, and the pixel value of the pixel on the scanning line below the interpolation target pixel.
- the pixel value determined in the interpolation processing step or the pixel value corrected in the interpolation value limiting step is selectively output as an interpolation video signal. Prevent malfunction And a operation preventing step.
- the malfunction preventing step when the horizontal position is taken along the horizontal axis and the pixel value is taken along the vertical axis, a curve indicating the pixel value of the pixel on the scanning line above the target pixel and the scanning line below the pixel to be interpolated
- Intersection area detection step of determining whether or not the interpolation target pixel is positioned in an intersection area which is an area in the vicinity of a horizontal position where the curve intersects with the curve indicating the pixel value of the pixel; According to the result, for the interpolation target pixel determined not to be located in the intersection area, the pixel value corrected by the interpolation value limiting means is interpolated.
- the interpolation target pixel which is output as an image signal and is determined to be located in the intersection area may include a selection step of outputting a pixel value determined by the interpolation processing unit as an interpolation video signal. /.
- the first subtraction result value (the sign of U, the value of the subtraction result of the pixel value of the second pixel (Pdl) located at the same horizontal position as the first pixel, and the scanning line above the pixel to be interpolated From the pixel value of the third pixel (Pur) located on the right of the interpolation target pixel, the pixel value of the fourth pixel (Pdr) located on the scanning line below the interpolation target pixel and at the same horizontal position as the third pixel.
- the sign of the first subtraction result value and the sign of the second subtraction result value are different, and the absolute value of the first subtraction result value and the absolute value of the second subtraction result value If both are equal to or greater than a first threshold greater than 0, it may be determined that the pixel to be interpolated is located in the intersection area.
- the sign of the first subtraction result value and the sign of the second subtraction result value are different, and the absolute value of the first subtraction result value and the absolute value of the second subtraction result value Are both greater than or equal to a first threshold greater than 0, and both the absolute value of the difference between the first and third pixels and the absolute value of the difference between the second and fourth pixels are greater than 0. If it is equal to or higher than the second threshold, it may be determined that the interpolation target pixel is located in the intersection area.
- a diagonal line detection step is performed to determine whether a diagonal line is present instead of a diagonal edge in the vicinity of the pixel to be interpolated, and the vicinity thereof according to the detection result of the diagonal line detection step.
- the pixel value corrected in the interpolation value limiting step is output as an interpolated video signal for the interpolation target pixel determined to have no diagonal line in the image, and the interpolation target pixel determined to have a diagonal line in the vicinity thereof is output.
- a selection step of outputting the pixel value determined in the interpolation processing step as an interpolated video signal And may be included.
- FIG. 1 is a block diagram showing a configuration of a scanning line interpolation apparatus according to a first embodiment of the present invention.
- FIG. 2 is a block diagram showing an example of the configuration of the interpolation processing unit 10.
- FIG. 3 is a diagram for explaining the operation of the intersection area detection unit 14.
- FIG. 4 is a diagram for explaining the operation of the scanning line interpolation device when the interpolation target pixel Pi is not located in the intersection area.
- FIG. 5 is a diagram for explaining the operation of the scanning line interpolation device when the pixel Pi to be interpolated is located in the intersection area.
- FIG. 6 is a diagram showing a specific example of an interpolated video signal generated by a scanning line interpolation device.
- FIG. 7 is a diagram for explaining the operation of the scanning line interpolation device according to a modification.
- FIG. 8 is a view for explaining the operation of the scanning line interpolation device according to the modification.
- FIG. 9 is a diagram for explaining the operation of the scanning line interpolation device according to a modification.
- FIG. 10 is a block diagram showing a configuration of a conventional scanning line interpolation device.
- FIG. 11 is a diagram for explaining the operation of the conventional scanning line interpolation device when a video signal having oblique edges is input.
- FIG. 12 is a diagram for explaining the operation of the conventional scanning line interpolation device when a video signal having oblique lines is input.
- FIG. 13A is a view for explaining the operation of the conventional scanning line interpolation device.
- FIG. 13B is a view for explaining the operation of the conventional scanning line interpolation device.
- FIG. 13C is a view for explaining the operation of the conventional scanning line interpolation device. Explanation of sign [0027] 10 interpolation processing unit
- FIG. 1 is a block diagram showing the configuration of a scanning line interpolation apparatus according to an embodiment of the present invention.
- the scanning line interpolation device includes an interpolation processing unit 10, an interpolation value limiting unit 12, a cross area detection unit 14, and a selection unit 16.
- Interpolation processing unit 10 determines the pixel value of the interpolation target pixel based on the correlation between two pixels located in the diagonal direction of the interpolation target pixel based on the upper line video signal and the lower line video signal.
- interpolation processing itself based on the correlation between two pixels in the diagonal direction of the interpolation target pixel as described above is a known technique, and various methods have been conventionally considered as a diagonal interpolation processing method. .
- the interpolation processing unit 10 may use any of them.
- an angle 'correlation detection unit 101 detects an angle of an oblique edge or an oblique line based on the correlation of two pixels located in the oblique direction of the interpolation target pixel, and further corresponds to the detected angle. Calculate the accuracy of the pixel correlation.
- the diagonal interpolation processing unit 102 determines the pixel value of the pixel to be interpolated based on the pixel values of two pixels corresponding to the angle detected by the angle / correlation detection unit 101.
- the vertical interpolation processing unit 103 determines the pixel value of the interpolation target pixel based on the pixel values of two pixels adjacent to the upper and lower sides of the interpolation target pixel.
- the mixing unit 104 calculates the interpolation value (diagonal interpolation value) obtained by the diagonal interpolation processing unit 102 and the interpolation value (vertical interpolation value) obtained by the vertical interpolation processing unit 103 by the angle / correlation detection unit 101. According to the certainty of the correlation Mix in proportions. In addition, the calculation method of the certainty of correlation can be performed using any known calculation method.
- the diagonal interpolation value and the vertical interpolation may be mixed.
- the interpolation value limiting unit 12 is configured to interpolate the pixel value determined by the interpolation processing unit 10 based on the pixel value determined by the interpolation processing unit 10, the upper line video signal, and the lower line video signal. Determine whether it is out of the range between the pixel values of the upper and lower adjacent pixels
- the interpolation value limiting unit 12 determines that the pixel value of the interpolation target pixel is The pixel value determined by the interpolation processing unit 10 is corrected and output so as to fall within the range between the pixel values of the upper and lower adjacent pixels. If the pixel value determined by the interpolation processing unit 10 is not out of the range between the pixel values of the adjacent pixels above and below the interpolation target pixel, the interpolation value limiting unit 12 determines the pixel determined by the interpolation processing unit 10. Output as it is without correcting the value.
- the cross region detection unit 14 and the selection unit 16 interpolate based on the pixel value of the pixel on the scanning line above the interpolation target pixel and the pixel value of the pixel on the scanning line below the interpolation target pixel.
- a malfunction of the interpolation value limiting unit 12 as shown in FIG. It functions as a malfunction prevention means to prevent.
- the intersection area detection unit 14 When the horizontal position is taken along the horizontal axis and the pixel value is taken along the vertical axis, the intersection area detection unit 14 has a curve indicating the pixel value of the pixel on the scanning line above the interpolation target pixel and a scanning line below the interpolation target pixel. Whether or not the pixel to be interpolated is located in a region near the horizontal position where the curve indicating the pixel value of the pixel intersects (corresponding to the malfunction range in FIG. 12; hereinafter this region is referred to as a crossover region). And outputs a signal indicating the determination result. The specific operation of the intersection area detection unit 14 will be described later.
- the selection unit 16 selects either the pixel value output from the interpolation processing unit 10 or the pixel value output from the interpolation value restriction unit 12 in accordance with the determination result of the intersection area detection unit 14. Output as an interpolated video signal. More specifically, the intersection area detection unit 14 interpolates When it is determined that the target pixel is not located in the intersection area, the selection unit 16 outputs the pixel value output from the interpolation value control unit 12 as an interpolated video signal, and the intersection area detection unit 14 outputs an interpolation target. If it is determined that the pixel is located in the intersection area, the selection unit 16 outputs the pixel value output from the interpolation processing unit 10 as an interpolated video signal.
- the interpolation target pixel located in the intersection area is excluded from the processing target of the interpolation value limiting unit 12, and the interpolation target pixel of other than that is the processing target of the interpolation value limiting unit 12. Therefore, the effect of the oblique interpolation processing is sufficiently exhibited even with a force that suppresses the image quality deterioration due to the malfunction of the oblique interpolation processing.
- intersection area detection unit 14 Next, with reference to FIG. 3, the specific operation of the intersection area detection unit 14 will be described.
- the intersection area detection unit 14 detects the mth pixel Pdl on the left from the pixel Pd based on the pixel value of the mth (m is a natural number) pixel Pul on the left from the pixel Pu just above the interpolation target pixel Pi. Calculate the difference L by subtracting the pixel value of. Similarly, the pixel value of the n-th pixel Pdr to the right of the pixel Pd is subtracted from the pixel value of the n-th (n is a natural number) pixel Pur to the right of the pixel Pu directly above the interpolation target pixel Pi. The difference R is obtained.
- intersection area detection unit 14 determines whether the signs of the difference L and the difference R calculated in this way are the same, and if the signs of both are the same, it is determined that the interpolation target pixel Pi is not located in the intersection area. If the two codes are different, it is determined that the interpolation target pixel Pi is located in the intersection region.
- m and n may be the same value or different values. As the values of m and n, optimum values may be adopted according to the format of the video signal, the configuration of the interpolation processing unit 10, and the like. Furthermore, the values of m and n may be adaptively changed in accordance with the angle detected by, for example, the angle / correlation detection unit 101 in FIG.
- FIG. 4 shows the relationship between the upper line video signal, the lower line video signal, and the desired interpolated video signal in a video signal having diagonal lines.
- the horizontal axis indicates the horizontal position of the pixel, and the vertical axis indicates the pixel value.
- the video signal is represented by a continuous curve for the sake of convenience.
- the sign of the difference L ie, the value obtained by subtracting the pixel value of the pixel Pdl from the pixel value of the pixel Pul
- the difference R ie, the pixel value of the pixel Pur to the pixel value of the pixel Pdr.
- the sign of the result of subtraction of is also negative.
- the intersection area detection unit 14 determines that the interpolation target pixel Pi is not located in the intersection area, and as a result, the interpolation value restriction unit 1
- the pixel value output from 2 that is, the pixel value corrected to be the value between the pixel Pu and the pixel Pd as shown by the arrow in FIG. 4 is output from the selection unit 16 as an interpolated video signal.
- the intersection area detection unit 14 determines that the interpolation target pixel Pi is located in the intersection area, and as a result, the pixel value (here, normal pixel value) force output value from the interpolation processing unit 10 is output by the interpolation value restriction unit 12 It is output from the selection unit 16 as an interpolated video signal as it is without being corrected.
- the scanning line interpolation process based on the scanning line A video signal (upper line video signal) and the scanning line C video signal (lower line video signal) performs scanning line interpolation processing.
- the case of generating the (interpolated video signal) will be described.
- the pixel values output from the interpolation processing unit 10 are as shown by the scanning line B in FIG. 13B.
- the pixel value of the pixel B2 is an incorrect value due to a malfunction of the oblique interpolation processing, and the other pixel values are normal values.
- the pixel value output from the interpolation value limiting unit 12 is as shown by the scanning line B in FIG. 13C. In FIG.
- the pixel value of the pixel B2 is corrected by the interpolation value limiting unit 12 so as to fall within the range between the pixels of the adjacent pixels above and below the pixel B2 (ie, the pixels A2 and C2). It is closer to the ideal value than in the case of FIG. 13B.
- the pixel value of the pixel B6 is erroneously corrected by the interpolation value limiting unit 12 so as to fall within the range between the pixel values of the upper and lower adjacent pixels (ie, the pixel A6 and the pixel C6) of the pixel B6.
- the intersection area detection unit 14 detects the second pixel Pdl from the pixel Pd to the left from the pixel Pu of the second pixel Pul from the pixel Pu immediately above the interpolation target pixel Pi to the left.
- the difference L is calculated by subtracting the pixel L of the pixel P, and the pixel value of the second pixel Pur to the right of the pixel Pu just above the pixel Pi to be interpolated, the pixel of the second pixel Pdr to the right of the pixel Pd.
- the difference R is obtained by subtracting the values.
- the intersection area detection unit 14 determines that the pixels B5, B6, and B7 are located in the intersection area, and the pixels Bl, B2, B3, B4, B8, B9, BIO, and B11 are not located in the intersection area. It will be determined that As a result, for the pixels B5, B6, and B7, the selection unit 16 outputs the pixel values output from the interpolation processing unit 10 (ie, as shown in FIG. 13B). The pixel B5, B6, B7) is selected, and the pixel Bl, B2, B3, B4, B8, B9, BIO, BI is the pixel value output from the interpolation value limiter 12 (ie, FIG. 13C). Pixels Bl, B2, B3, B4, B8, B9, BIO, B11) are selected. As a result, the interpolated video signal output from the selection unit 16 is as shown by the scanning line B in FIG.
- the intersection area detection unit 14 determines whether or not the sign of the difference L and the sign of the difference R are the same. It is determined that the pixel Pi is not located in the intersection area, and if the two codes are different, it is determined that the pixel Pi to be interpolated is located in the intersection area. In this case, for example, in FIG. 4, it is determined that the pixel value of the pixel Pdl is slightly smaller than the pixel value of the pixel Pul! /, And in the case, the interpolation target pixel Pi is determined to be located in the intersection region. The pixel value is output as an interpolated video signal without being corrected.
- the intersection area detection unit 14 merely determines whether the signs of the difference L and the difference R are the same or not, and further the absolute values of both the difference L and the difference R are threshold values. It is preferable to determine whether the interpolation target pixel Pi is located in the intersection area by determining whether S 1 (S 1 is a value larger than 0) or more. For example, if the signs of the difference L and the difference R are different from each other and the absolute values of the difference L and the difference R are both equal to or greater than the threshold S1, the intersection region detection unit 14 intersects the interpolation region Pi In other cases, it may be determined that the interpolation target pixel Pi is not located in the intersection area. This enables more appropriate scanning line interpolation processing. In addition, if the value of S1 adopts an optimal value according to the format of the video signal, the configuration of the interpolation processing unit 10, etc.
- the intersection area detection unit 14 calculates the absolute value of the difference between the pixel value of the pixel Pul and the pixel value of the pixel p ur (hereinafter referred to as difference U) and the pixel value of the pixel Pdl and the pixel
- difference U the absolute value of the difference between the pixel values of Pdr
- S2 is a value greater than 0
- the intersection area detection unit 14 may generate the difference L and the difference R If the absolute values of the differences L and R are both greater than or equal to the threshold SI and the absolute values of the differences U and D are both greater than or equal to the threshold S2, then the pixel to be interpolated Pi is different. Is determined to be located in the intersection area, otherwise it may be determined that the interpolation target pixel Pi is not located in the intersection area.
- the pixel value of the interpolation target pixel Pi Is preferably within the range between the pixel values of the upper and lower adjacent pixels Pu and Pd.
- the intersection area is determined only by the sign and the absolute value of the difference L and the difference R, in both cases of FIGS. Since both of the differences L and R differ from each other and the absolute values of the differences L and R are greater than or equal to the threshold S 1, it is determined that the interpolation target pixel Pi is located in the intersection region (malfunction range). Then, even if an incorrect pixel value is output from the interpolation processing unit 10, that pixel value is unfortunately not corrected.
- the signs of difference L and difference R are different, and the absolute values of difference L and difference R are both equal to or greater than threshold S1, and the absolute values of difference U and difference D are both.
- threshold value S2 or more it is determined that the interpolation target pixel Pi is located in the intersection area. Therefore, in any of FIGS. 7, 8 and 9, since the difference D (the difference between the pixel value of the pixel Pdl and the pixel value of the pixel Pdr) is a relatively small value (less than the threshold value S2), interpolation is performed. It is determined that the target pixel Pi is not located in the intersection area.
- the interpolation value control unit 12 effectively functions with respect to the interpolation target pixel Pi and even if an incorrect pixel value is output from the interpolation processing unit 10, the pixel value is the upper and lower adjacent pixels Pu, It is corrected to the range between the pixel values of Pd.
- an optimal value may be adopted according to the format of the video signal, the configuration of the interpolation processing unit 10, and the like.
- the interpolated video signal is generated based on the video signals of the two scanning lines of the upper line video signal and the lower line video signal, but the present invention is limited to this.
- the present invention can also be applied to the case of generating an interpolated video signal based on video signals of three or more scanning lines.
- a curve indicating the pixel value of the pixel on the scanning line above the interpolation target pixel and a scanning line below the interpolation target pixel Should be processed by the interpolation value limiting unit 12 by determining whether the interpolation target pixel is positioned in the intersection area, which is an area near the horizontal position where the curve intersects with the pixel value of the pixel.
- the interpolation target pixel and the interpolation target pixel to be excluded from the processing target of the interpolation value restriction unit 12 are determined.
- the present invention is not limited to this, and the interpolation target pixel to be processed by the interpolation value limiter 12 and the processing target of the interpolation value limiter 12 should be excluded by another appropriate alternative method. It may be determined from the interpolation target pixel. For example, when the horizontal position of the interpolation value limiting unit 12 is horizontal and the pixel value is vertical, the curve showing the pixel value of the pixel on the scanning line above (or below) the pixel to be interpolated is shown in FIG. Focusing on the fact that V-shaped or inverted V-shaped (this is displayed as a diagonal line)!
- the interpolation target pixel determined not to be processed is the processing target of the interpolation value restriction unit 12 (that is, the pixel value output from the interpolation value restriction unit 12 is output as an interpolation video signal), and a diagonal line exists in the vicinity thereof.
- the interpolation target pixel determined to be determined may not be processed by the interpolation value limiting unit 12 (ie, the pixel value output from the interpolation processing unit 10 may be output as an interpolated video signal). Whether or not there is an oblique line in the vicinity of the pixel to be interpolated may be detected by any known method.
- the present invention it is possible to perform scanning line interpolation in which the effect of the oblique interpolation process is sufficiently exhibited while suppressing the image quality deterioration due to a malfunction of the oblique interpolation process.
- the present invention can be suitably applied to a progressive scan conversion apparatus for converting a signal into a sequentially scanned video signal.
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EP07830637A EP2086228A1 (en) | 2006-11-14 | 2007-10-26 | Scanning line interpolating device and scanning line interpolating method |
CN2007800419437A CN101536509B (zh) | 2006-11-14 | 2007-10-26 | 扫描线内插装置及扫描线内插方法 |
US12/514,172 US8237858B2 (en) | 2006-11-14 | 2007-10-26 | Scanning line interpolating device and scanning line interpolation method |
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JP2006308174A JP5080783B2 (ja) | 2006-11-14 | 2006-11-14 | 走査線補間装置および走査線補間方法 |
JP2006-308174 | 2006-11-14 |
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WO2008059704A1 true WO2008059704A1 (fr) | 2008-05-22 |
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PCT/JP2007/070903 WO2008059704A1 (fr) | 2006-11-14 | 2007-10-26 | Dispositif d'interpolation de ligne de balayage et procédé d'interpolation de ligne de balayage |
Country Status (6)
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US (1) | US8237858B2 (ja) |
EP (1) | EP2086228A1 (ja) |
JP (1) | JP5080783B2 (ja) |
KR (1) | KR20090079955A (ja) |
CN (1) | CN101536509B (ja) |
WO (1) | WO2008059704A1 (ja) |
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KR102253446B1 (ko) | 2014-11-10 | 2021-05-20 | 삼성디스플레이 주식회사 | 표시 장치 및 이의 표시 제어 방법 및 장치 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0823510A (ja) * | 1994-07-05 | 1996-01-23 | Sony Corp | テレビジョン信号の補間回路 |
JP2002185934A (ja) | 2000-12-14 | 2002-06-28 | Matsushita Electric Ind Co Ltd | 走査線補間装置 |
JP2004193747A (ja) * | 2002-12-09 | 2004-07-08 | Mitsubishi Electric Corp | 走査線補間装置および画像表示装置並びに走査線補間方法 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04364685A (ja) * | 1991-06-12 | 1992-12-17 | Toshiba Corp | 走査線補間装置 |
JP4108969B2 (ja) * | 2000-12-14 | 2008-06-25 | 松下電器産業株式会社 | 画像角度検出装置およびそれを備えた走査線補間装置 |
GB2402288B (en) * | 2003-05-01 | 2005-12-28 | Imagination Tech Ltd | De-Interlacing of video data |
-
2006
- 2006-11-14 JP JP2006308174A patent/JP5080783B2/ja not_active Expired - Fee Related
-
2007
- 2007-10-26 CN CN2007800419437A patent/CN101536509B/zh not_active Expired - Fee Related
- 2007-10-26 KR KR1020097009999A patent/KR20090079955A/ko not_active Application Discontinuation
- 2007-10-26 US US12/514,172 patent/US8237858B2/en not_active Expired - Fee Related
- 2007-10-26 EP EP07830637A patent/EP2086228A1/en not_active Withdrawn
- 2007-10-26 WO PCT/JP2007/070903 patent/WO2008059704A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0823510A (ja) * | 1994-07-05 | 1996-01-23 | Sony Corp | テレビジョン信号の補間回路 |
JP2002185934A (ja) | 2000-12-14 | 2002-06-28 | Matsushita Electric Ind Co Ltd | 走査線補間装置 |
JP2004193747A (ja) * | 2002-12-09 | 2004-07-08 | Mitsubishi Electric Corp | 走査線補間装置および画像表示装置並びに走査線補間方法 |
Also Published As
Publication number | Publication date |
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US20100033623A1 (en) | 2010-02-11 |
KR20090079955A (ko) | 2009-07-22 |
CN101536509A (zh) | 2009-09-16 |
JP5080783B2 (ja) | 2012-11-21 |
US8237858B2 (en) | 2012-08-07 |
EP2086228A1 (en) | 2009-08-05 |
CN101536509B (zh) | 2011-05-18 |
JP2008124909A (ja) | 2008-05-29 |
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