JP2009088893A - Display device and display program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To resize an input image to arbitrary magnification vertically and horizontally and to output the resized input image. <P>SOLUTION: The display device is provided with: a vertical resizing block 1 for using an interpolating filter that increases a sampling frequency by n times to decrease a signal obtained by increasing a frequency of a pixel adjacent in a vertical direction of an input image signal by n times and a frequency of a superimposed signal by 1/m times; a horizontal resizing block 2 for using an interpolating filter that increases a sampling frequency by j times to decrease a signal obtained by increasing a frequency of a pixel adjacent in a horizontal direction of a signal outputted from the vertical resizing block 1 and the frequency of the superimposed signal by 1/k times; and a two-dimensional filter block 3 for attenuating a high frequency component in a slant direction and using a two-dimensional filter having amplitude having a flat passband regardless of a direction to superimpose the high frequency component with a signal outputted from the horizontal resizing filter. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a display device and a display program that resize and output an input image signal in an arbitrary magnification in the vertical and horizontal directions.

  Generally, a display device such as a television resizes input image data to the display size of the display device. In such a display device, a vertical resize block that interpolates a new pixel between pixels in the vertical direction and a horizontal resize block that interpolates a new pixel between the pixels in the horizontal direction are cascaded. . In the display device 900a shown in FIG. 19A, after an input signal is resized in the vertical direction by the vertical resize block 901a, the input signal is resized in the horizontal direction by the horizontal resize block 902a and output. In the display device 900b shown in FIG. 19B, the input signal is resized in the horizontal direction by the horizontal resize block 902b, and then resized in the vertical direction by the vertical resize block 901b and output.

  In the display devices 900a and 900b having the configuration shown in FIG. 19, the frequency characteristic is represented by the product of the filter characteristic used for the vertical enlargement process in the vertical resize block and the filter characteristic used for the horizontal enlargement process in the horizontal resize block. The Specifically, as shown in FIGS. 20 (a) and 20 (b), it has a square frustum-shaped passband, and the band in the oblique direction becomes wider than in the vertical and horizontal directions.

  In such conventional display devices 900a and 900b, the interpolation processing for resizing in the vertical direction and the horizontal direction is performed by one-dimensional filter processing. For this reason, in the enlarged image output from the display device 900, there is a problem that a folding component is generated in a high-frequency portion in an oblique direction, the oblique line becomes jagged, and the image is deteriorated. In addition, when trying to obtain a smooth diagonal line by narrowing the frequency band in the diagonal direction, in the conventional display devices 900a and 900b, the passbands of the frequency components in the vertical direction and the horizontal direction are also narrowed. There is a problem that the image is blurred and deteriorated.

In order to solve this, there is a method using a two-dimensional filter (see, for example, Patent Document 1). In the method described in Patent Document 1, a local edge direction is detected after an image is simply magnified twice. Furthermore, by performing the process of changing the frequency component to be cut according to the detected edge direction, the method described in Patent Document 1 can smoothly perform image interpolation on the edge in the oblique direction. In addition, there is a method of using a two-dimensional filter as an interpolation filter, and it is possible to narrow a diagonal pass band without narrowing a vertical and horizontal pass band, and to smoothly interpolate a diagonal line.
Japanese Patent No. 3760531

  However, the method described in Patent Document 1 has a problem in that an enlarged image having an arbitrary magnification cannot be obtained because the image is simply enlarged twice. Further, in the method using the above-described two-dimensional filter as an interpolation filter, the number of samples of the two-dimensional filter with the same accuracy is required for the oversampling frequency in the vertical direction and the horizontal direction during the interpolation process. There is a problem. Therefore, an object of the present invention is to provide a display device and a display program that can obtain an enlarged image at an arbitrary magnification without deteriorating the image.

  In order to solve the above-mentioned problems, the present invention comprises means described in 1) to 2) below.

That is,
1) A display device (10) for resizing and outputting an input image signal to an arbitrary magnification in the vertical and horizontal directions in order to match the display size.
An upsampler (4) that calculates an interpolation pixel position from the size of the input image signal and the display size, and increases the frequency of pixels adjacent in the vertical direction of the input image signal by n times (n is a positive integer). ), And the filter convolution processing unit (5) and the downsampler (6) reduce the frequency of the signal output from the upsampler (4) to 1 / m times (m is a positive integer), and the input image signal Vertical resizing block (1) for resizing pixels adjacent in the vertical direction by n / m times,
An upsampler (4) that calculates an interpolation pixel position from the size of the input image signal and the display size, and increases the frequency of a pixel adjacent in the horizontal direction of the input image signal by j times (j is a positive integer). ), And the filter convolution processing unit (5) and the downsampler (6) reduce the frequency of the signal output from the upsampler (4) to 1 / k times (k is a positive integer), and the input image signal Horizontal resizing block (2) for resizing pixels adjacent in the horizontal direction to j / k times,
A two-dimensional filter block (3) having a frequency characteristic for attenuating an oblique high frequency component of the input image signal;
A display device (10) comprising:

2) A display program for resizing and outputting an input image signal to an arbitrary magnification in the vertical and horizontal directions in order to match the display size.
An interpolation pixel position is calculated from the size of the input image signal and the display size, and the input image signal is calculated using an interpolation filter that samples the interpolation pixel position to 1 / n and increases the sampling frequency by n times. The frequency of pixels adjacent to each other in the vertical direction is convolved with a signal increased n times, and the frequency of the signal increased with the frequency increased n times and the frequency of the convolved signal are reduced to 1 / m times to obtain the input image. Vertical resizing means (1) for resizing pixels adjacent in the vertical direction of the signal to n / m times;
An interpolation pixel position is calculated from the size of the input image signal and the display size, and the input image signal is calculated using an interpolation filter that samples the interpolation pixel position to 1 / j and increases the sampling frequency by a factor of j. The frequency of pixels adjacent to each other in the horizontal direction is convolved with a signal that has been increased by a factor of j, the frequency of the signal that has been increased by a factor of j and the frequency of the convolved signal is decreased by a factor of 1 / k, and the input image Horizontal resizing means (2) for resizing pixels adjacent in the horizontal direction of the signal to j / k times;
Two-dimensional filter means (3) having a frequency characteristic for attenuating a high frequency component in an oblique direction of the input image signal;
Display program characterized by functioning

  According to the present invention, the vertical line resizing process by normal oversampling and the horizontal resize process are performed together with the process of removing the high frequency component in the diagonal direction using the two-dimensional filter, thereby reducing the jaggy of the diagonal line. It is possible to provide a display device and a display program capable of obtaining a suppressed enlarged image with an arbitrary magnification.

  Next, embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

(First embodiment)
A display device 10 according to a first embodiment of the present invention will be described with reference to FIG. The display device 10 according to the first embodiment of the present invention is, for example, a television. The image displayed on the display device 10 may be a moving image or a still image. The display device 10 according to the first embodiment of the present invention includes a vertical resize block 1, a horizontal resize block 2, and a two-dimensional filter block 3.

  The vertical resizing block 1 increases the frequency in the vertical direction of the input image signal by n / m (m and n are positive integers), and resizes the input image signal by n / m in the vertical direction. The vertical resizing block 1 increases the sampling frequency by n times by sampling the sampling position to 1 / n by increasing the frequency of pixels adjacent in the vertical direction of the input image signal by n times and the sampling position by 1 / n. A filter convolution processing unit 5 that convolves with the signal output from the upsampler 4 using an interpolation filter, and a downsampler 6 that reduces the frequency of the signal output from the filter convolution processing unit 5 to 1 / m times. .

  The horizontal resizing block 2 resizes the input image signal by j / k times in the horizontal direction by multiplying the horizontal frequency of the signal output from the vertical resizing block 1 by j / k times (k and j are positive integers). To do. The horizontal resizing block 2 is configured to increase the frequency of pixels adjacent in the horizontal direction of the signal output from the vertical resizing block 1 by j times, and the sampling position to 1 / j to obtain the sampling frequency. Using the interpolation filter increased by a factor of j, the filter convolution processing unit 5 for convolution with the signal output from the upsampler 4 and the frequency of the signal output from the filter convolution processing unit 5 are reduced to 1 / k times. A down sampler 6.

  The two-dimensional filter block 3 attenuates the high-frequency component in the oblique direction and convolves with the signal output from the horizontal resize block 2 using a two-dimensional filter having an amplitude that makes the passband flat regardless of the direction.

  Here, the vertical resize block 1 will be described in detail. When an input image signal is input, the vertical resize block 1 outputs a signal resized to an arbitrary magnification (n / m times) by oversampling in the vertical direction to the horizontal resize block 2. For example, when resizing to 4/3 times, the vertical resizing block 1 uses 4 times upsampling and 1/3 downsampling, and when a vertical 4-tap interpolation filter is used, 4 pixels in the vertical direction. 4/3 times interpolation enlargement can be performed.

  As shown in FIG. 2, the vertical resize block 1 includes an up sampler 4, a filter convolution processing unit 5, and a down sampler 6. When the input image signal shown in FIG. 3A is input, the up-sampler 4 inserts zero-valued pixels at three points (n−1 points) between the pixels as shown in FIG. 3B. Then, the apparent frequency is output 4 times (n times).

  Next, the filter convolution processing unit 5 convolves with the image signal sampled by the upsampler 4 using an interpolation filter coefficient as shown in FIG. This interpolation filter is a filter in which the sampling frequency is increased to 4 times (n times) by sampling the sampling position to 1/4 (1 / n). Specifically, the interpolated filter coefficient shown in FIG. 4 is convolved with the signal inserted with the zero value shown in FIG. 3B to obtain the convolution signal shown in FIG.

  The signal output by the filter convolution processing unit 5 is input to the down sampler 6 to reduce the frequency of the signal by 1/3 (1 / m). Specifically, the signal shown in FIG. 3D is reduced to 1/3 by thinning out the signal every two pixels (m−1 pixels) from the signal obtained by convolving the filter shown in FIG. A signal that is doubled can be acquired.

  The signal value of each pixel shown in FIG. 3D acquired by such processing is resized to 4/3 times (n / m times) the input signal shown in FIG. It becomes an image signal.

  As described above, when the input image signal is interpolated or reduced in the vertical direction by the vertical resize block 1, it is input to the horizontal resize block 2.

  Here, the horizontal resize block 2 will be described in detail. When the output signal from the vertical resize block 1 is input, the horizontal resize block 2 interpolates in the horizontal direction by oversampling and resizes the signal to an arbitrary magnification (j / k times) to the two-dimensional filter block 3. Output. For example, when resizing to 3/2 times, the horizontal resize block 2 may perform 3/2 times interpolation expansion with reference to the pixels in the horizontal direction by 3 times upsampling and 1/2 downsampling. it can.

  Similar to the vertical resizing block 1, the horizontal resizing block 2 includes an upsampler, a filter convolution processing unit, and a downsampler. When the input image signal shown in FIG. 3A is input, the upsampler inserts two (j−1) points of zero-valued pixels between each pixel, as in FIG. 3B. The apparent frequency is tripled (j times) and output.

  Next, the filter convolution processing unit 5 convolves with the image signal sampled by the upsampler, using the interpolation filter coefficient as in FIG. This interpolation filter is a filter in which the sampling frequency is increased to 3 times (j times) by sampling the sampling position to 1/3 (1 / j). Specifically, the interpolated filter coefficient shown in FIG. 4 is convolved with the signal in which the zero value shown in FIG. 3B is inserted, and a convolution signal is obtained in the same manner as in FIG.

  The signal output by the filter convolution processing unit 5 is input to the down sampler, and the frequency of the signal is reduced to 1/2 (1 / k). Specifically, the frequency is halved in the same manner as in FIG. 3D by thinning out the signal every other pixel (k-1 pixel) from the signal obtained by convolving the filter shown in FIG. A reduced signal can be obtained.

  An image signal resized to an arbitrary magnification in the vertical and horizontal directions by the vertical resize block 1 and the horizontal resize block 2 is input to the two-dimensional filter block 3. In the two-dimensional filter block 3, a two-dimensional filter having a tap number of 7 × 7 is convoluted.

  The two-dimensional filter used in the two-dimensional filter block 3 attenuates the high frequency component in the oblique direction by synthesizing the vertical and horizontal one-dimensional filters, and has an amplitude that makes the passband flat regardless of the direction. As shown in FIG. 5, the two-dimensional filter performs band limitation in an oblique direction to suppress the aliasing component. Specifically, when the cut-off frequency of the filter used for vertical interpolation expansion is fs_v / 2 and the cut-off frequency of the filter used for horizontal interpolation expansion is fs_h / 2, from the positive position of the horizontal axis. In the oblique direction of the angle θ, the pass band is cos θ times. In the example shown in FIG. 5, the cutoff frequency is not the position of the point A but the position of the point A ′.

  The two-dimensional filter is, for example, a filter having a diamond-type pass band as shown in FIG. 6 or a round pass band as shown in FIG. By using such a two-dimensional filter, the band direction equivalent to the vertical and horizontal passbands is limited for the diagonal direction component to suppress the aliasing component, so that the diagonal component of the enlarged image is not jagged. Smooth restoration processing can be performed.

  Here, the two-dimensional filter processing in the two-dimensional filter block 3 will be described in detail.

  When performing 2D filter processing of 7 × 7 pixels, a block of 7 × 7 pixels of the image signal input to the 2D filter processing block 3 is referred to for each pixel of the output image. For example, when the output image signal do (x, y) at the coordinates (x, y) in FIG. 8B is calculated, 7 × 7 indicated by “referenced 7 × 7 pixels” in FIG. The pixel data of the input image signal is referred to for these pixels. Here, FIG. 9 shows the input image signal di (x + i, y + i) of 7 × 7 pixels to be referred to. In FIG. 9, the values are in the range of −3 ≦ i ≦ 3 and −3 ≦ j ≦ 3.

In addition, the two-dimensional filter coefficient f (a, b) having the number of taps of 7 × 7 has −3 ≦ a ≦ 3 and −3 ≦ b ≦ centered on f (0, 0) as shown in FIG. Has a value in the range of 3.

  At this time, as shown in Expression (1), the filter coefficient is integrated and the sum of the integration results is the image signal of the output image. In order to obtain all output image signals, the two-dimensional filter block 3 performs a product-sum operation on all P × Q pixels of the image input to the two-dimensional filter block 3.

  Next, processing of each processing block of the display device of the present invention will be described with reference to FIGS.

  With reference to FIG. 11, the vertical resize processing by the vertical resize block 1 will be described.

  First, in step S101, a pixel position to be vertically interpolated is calculated. This pixel position is determined according to the vertical interpolation magnification. When the vertical interpolation magnification is n / m, the pixel position is increased by m / n (relative to the pixel position calculated in the previous S101), and 0, m / n , 2 m / n, 3 m / n,.

  Next, in step S102, an interpolation filter coefficient corresponding to the pixel position calculated in step S101 is selected. In step S103, pixel data of peripheral lines used for interpolation is read from the frame memory and written to the line memory.

  In step S104, the product of the interpolation filter coefficient selected in step S102 and the pixel data read from the line memory in step S103 is obtained and added for a predetermined horizontal pixel. The process of step S104 is repeated for all horizontal pixels.

  In step S105, it is determined whether or not the processing in steps S101 to S104 is processing for the bottom line of the image. If it is not the process for the lower end line, the process returns to step S101 to process the next line. On the other hand, in the case of the processing of the lower end line, the vertical resize processing by the vertical resize block 1 ends.

  With reference to FIG. 12, the horizontal resize processing by the horizontal resize block 2 will be described.

  First, in step S201, a signal that has been vertically resized by the vertical resize block 1 is written into the line memory. Next, in step S202, a pixel position to be subjected to horizontal interpolation is calculated. This pixel position is determined according to the horizontal interpolation magnification. When the horizontal interpolation magnification is j / k, the pixel position is increased by k / j (relative to the pixel position calculated in the immediately preceding S202), and 0, k / j , 2k / j, 3k / j...

  Next, in step S203, an interpolation filter coefficient corresponding to the pixel position calculated in step S202 is selected. In step S204, peripheral pixel data used for interpolation is read from the line memory, and a product with the interpolation filter coefficient selected in step S203 is obtained and added.

  In step S205, it is determined whether or not the processing in steps S202 to S204 is processing for the rightmost pixel of the image. If the processing is not for the rightmost pixel, the process returns to step S202, and the pixel position to be subjected to horizontal interpolation next is calculated. On the other hand, in the case of processing of the rightmost pixel, in step S206, it is determined whether or not the processing of step S201 to step S205 is processing of the bottom line of the image. If it is not the process for the lower end line, the process returns to step S201 to process the next line. On the other hand, in the case of the processing of the bottom line, the horizontal resize processing by the horizontal resize block 2 is completed.

  With reference to FIG. 13, the two-dimensional filter processing by the two-dimensional filter block 3 will be described. Here, a case where the two-dimensional filter is M × N taps (M and N are positive integers) will be described.

  First, in step S301, signals horizontally resized by the horizontal resize block 2 are sequentially written in the line memory to delay the signals.

  Next, in step S302 and step S303, two-dimensional filter processing is performed for all pixels. Specifically, in step S302, M × N pixels centering on the pixel to be processed are selected from the line memory. Next, in step S303, the signal value of the M × N pixel selected in step S302 and the two-dimensional filter of M × N tap are respectively added and added. The added value is output as an output pixel of the processing target pixel. The processing in step S302 and step S303 is performed pixel by pixel from left to right from the upper end to the lower end of the image, and is output as the output pixel of each processing target pixel.

  According to the display device according to the first embodiment as described above, the high-frequency component in the oblique direction is removed using the two-dimensional filter together with the vertical resizing process and the horizontal resizing process by normal oversampling. By performing the processing, it is possible to obtain an enlarged image or a reduced image at an arbitrary magnification without degrading the image.

  In addition, by performing up-sampler and down-sampler with an arbitrary magnification in the vertical resize block and the horizontal resize block, it is possible to output an image signal resized at an arbitrary magnification in the vertical direction and the horizontal direction, respectively.

  It is also possible to construct a display program for causing the computer to function by programming the functional configurations of the vertical resize block 1, the horizontal resize block 2 and the two-dimensional filter block 3 of the display device 10 and incorporating them into the computer. is there.

  In the first embodiment, as in the display device 10 shown in FIG. 1, after the vertical resize processing by the vertical resize block 1, the horizontal resize processing by the horizontal resize block 2 is performed and the horizontal resize processing is performed. Although the case where the two-dimensional filter processing by the two-dimensional filter block 3 is performed later has been described, after the horizontal resize processing by the horizontal resize block 2 is performed as in the display device 11 shown in FIG. The two-dimensional filter process by the two-dimensional filter block 3 may be performed after the vertical resize process is performed and the vertical resize process is performed.

(Second Embodiment)
FIG. 14 is a functional block diagram of a display device 10a according to the second embodiment of the present invention. Compared with the display device 10 according to the first embodiment of the present invention shown in FIG. 1, the display device 10a according to the second embodiment of the present invention shown in FIG. 14 has a two-dimensional filter block 3a. After the filtering process is performed, the vertical resizing process by the vertical resizing block 1a and the horizontal resizing process by the horizontal resizing block 2a are different.

  In the second embodiment, first, an input image signal is input to the two-dimensional filter block 3a, and two-dimensional filter processing is performed on the input image signal by the two-dimensional filter block 3a. As a result, the band is limited for the component in the oblique direction. Next, it is input to the vertical resize block 1a and subjected to interpolation reduction or interpolation enlargement in the vertical direction by oversampling. Finally, it is input to the horizontal resize block 2a, and is interpolated and reduced or enlarged in the horizontal direction by oversampling.

  With such a display device 10a according to the second embodiment of the present invention, it is possible to remove the folded component in the oblique direction, and to obtain a natural enlarged image or reduced image. In addition, by providing the vertical resize block 1a and the horizontal resize block 2a after the two-dimensional filter block 3a, the two-dimensional filter can be treated as a pre-filter when performing interpolation reduction / interpolation in the vertical and horizontal directions. it can. As a result, the display device 10a according to the second embodiment of the present invention can validate the band limitation in the vertical direction and the horizontal direction as well as in the oblique direction.

  In the second embodiment, like the display device 10a shown in FIG. 14, after the two-dimensional filter processing by the two-dimensional filter block 3a is performed, the vertical resizing processing by the vertical resizing block 1a is performed, and the vertical resizing processing is performed. In the above description, the horizontal resize processing by the horizontal resize block 2a has been described. However, after the two-dimensional filter processing by the two-dimensional filter block 3a is performed as in the display device 11a shown in FIG. After the horizontal resizing process by 2a and the horizontal resizing process, the vertical resizing process by the vertical resizing block 1a may be performed.

(Third embodiment)
FIG. 15 is a functional block diagram of a display device 10b according to the third embodiment of the present invention. The display device 10b according to the third embodiment of the present invention shown in FIG. 15 is more vertically resized by the vertical resize block 1b than the display device 10 according to the first embodiment of the present invention shown in FIG. The two-dimensional filter block 3a is subjected to two-dimensional filter processing, and after the two-dimensional filter processing is performed, the horizontal resize processing is performed using the horizontal resize block 2b.

  In the third embodiment, first, an input image signal is input to the vertical resizing block 1b, and the input image signal is subjected to interpolation reduction or interpolation enlargement in the vertical direction by oversampling. Next, it is input to the two-dimensional filter block 3b, and two-dimensional filter processing is performed by the two-dimensional filter block 3b. As a result, the band is limited for the component in the oblique direction. Next, the data is finally input to the horizontal resize block 2b and subjected to interpolation reduction or interpolation enlargement in the horizontal direction by oversampling.

  With such a display device 10b according to the second embodiment of the present invention, it is possible to remove an aliasing component in an oblique direction and obtain a natural enlarged image or reduced image. Further, by providing the horizontal resize block 2b after the two-dimensional filter block 3b, the two-dimensional filter can be treated as a pre-filter when performing horizontal interpolation reduction and interpolation expansion. As a result, the display device 10b according to the third embodiment of the present invention can validate the band limitation not only in the oblique direction but also in the horizontal direction.

  In the third embodiment, like the display device 10b shown in FIG. 15, after the vertical resize processing by the vertical resize block 1b is performed, the two-dimensional filter processing is performed by the two-dimensional filter block 3b. In the above description, the horizontal resize process is performed by the horizontal resize block 2b. However, as in the display device 11b shown in FIG. After the two-dimensional filter process by 3b is performed and the two-dimensional filter process is performed, the vertical resize process by the vertical resize block 1b may be performed. In this case, by providing the vertical resize block 1b after the two-dimensional filter block 3b, the two-dimensional filter can be treated as a pre-filter when performing vertical interpolation reduction and interpolation expansion, not only in the diagonal direction. , Vertical band limitation can be enabled.

1 is a functional block diagram of a display device according to a first embodiment of the present invention. It is a functional block diagram of the vertical resize block which concerns on the 1st Embodiment of this invention. It is a figure explaining an image signal in the interpolation process in the vertical resize block which concerns on the 1st Embodiment of this invention. It is a figure explaining the interpolation filter coefficient used in the interpolation process in the vertical resize block which concerns on the 1st Embodiment of this invention. It is a figure explaining the pass band of the two-dimensional filter of the display apparatus which concerns on the 1st Embodiment of this invention. FIG. 6A is a bird's-eye view, and FIG. 6B is a contour map, illustrating a diamond-type frequency characteristic of the two-dimensional filter of the display device according to the first embodiment of the present invention. . FIG. 7A is a bird's-eye view, and FIG. 7B is a contour map, illustrating a round frequency characteristic of the two-dimensional filter of the display device according to the first embodiment of the present invention. . FIG. 8A is a diagram illustrating a pixel to be referred to in the two-dimensional filter block of the display device according to the first embodiment of the present invention, and FIG. 8A is an input pixel, and FIG. ) Is an output pixel. It is a figure explaining the input pixel signal of the block to refer in the two-dimensional filter block of the display apparatus which concerns on the 1st Embodiment of this invention. It is a figure explaining the filter coefficient of a two-dimensional filter in the two-dimensional filter block of the display apparatus which concerns on the 1st Embodiment of this invention. It is a flowchart explaining the vertical resize process which concerns on the 1st Embodiment of this invention. It is a flowchart explaining the horizontal resizing process which concerns on the 1st Embodiment of this invention. It is a flowchart explaining the two-dimensional filter process which concerns on the 1st Embodiment of this invention. It is a functional block diagram of the display apparatus which concerns on the 2nd Embodiment of this invention. It is a functional block diagram of the display apparatus which concerns on the 3rd Embodiment of this invention. It is a functional block diagram of the display apparatus which concerns on the modification of the 1st Embodiment of this invention. It is a functional block diagram of the display apparatus which concerns on the modification of the 2nd Embodiment of this invention. It is a functional block diagram of the display apparatus which concerns on the modification of the 3rd Embodiment of this invention. It is a block diagram explaining the conventional display apparatus. It is a figure explaining the frequency characteristic in the conventional display apparatus, Comprising: Fig.20 (a) is a bird's-eye view, FIG.20 (b) is a contour map.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,901 Vertical resize block 2,902 Horizontal resize block 3 Two-dimensional filter block 10,900 Display apparatus

Claims (2)

In order to match the input image signal to the display size, it is a display device that resizes and outputs an arbitrary magnification in the vertical and horizontal directions,
An upsampler that calculates an interpolated pixel position from the size of the input image signal and the display size, and increases the frequency of pixels adjacent in the vertical direction of the input image signal by n times (n is a positive integer); The frequency of the signal output from the upsampler by the filter convolution processing unit and the downsampler is reduced to 1 / m times (m is a positive integer), and the pixels adjacent in the vertical direction of the input image signal are multiplied by n / m times. A vertical resizing block that resizes to
An upsampler that calculates an interpolated pixel position from the size of the input image signal and the display size, and increases the frequency of a pixel adjacent in the horizontal direction of the input image signal by j times (j is a positive integer); The frequency of the signal output from the upsampler by the filter convolution processing unit and the downsampler is reduced to 1 / k times (k is a positive integer), and the pixels adjacent in the horizontal direction of the input image signal are multiplied by j / k times. A horizontal resizing block that resizes to
A two-dimensional filter block having a frequency characteristic for attenuating an oblique high frequency component of the input image signal;
A display device comprising: A display program for resizing and outputting an input image signal to an arbitrary magnification in the vertical and horizontal directions in order to match the display size.
An interpolation pixel position is calculated from the size of the input image signal and the display size, and the input image signal is calculated using an interpolation filter that samples the interpolation pixel position to 1 / n and increases the sampling frequency by n times. The frequency of pixels adjacent to each other in the vertical direction is convolved with a signal increased n times, and the frequency of the signal increased with the frequency increased n times and the frequency of the convolved signal are reduced to 1 / m times to obtain the input image. Vertical resizing means for resizing pixels adjacent in the vertical direction of the signal by n / m times;
An interpolation pixel position is calculated from the size of the input image signal and the display size, and the input image signal is calculated using an interpolation filter that samples the interpolation pixel position to 1 / j and increases the sampling frequency by a factor of j. The frequency of pixels adjacent to each other in the horizontal direction is convolved with a signal that has been increased by a factor of j, the frequency of the signal that has been increased by a factor of j and the frequency of the convolved signal is decreased by a factor of 1 / k, and the input image Horizontal resizing means for resizing pixels adjacent in the horizontal direction of the signal to j / k times;
Two-dimensional filter means having a frequency characteristic for attenuating an oblique high frequency component of the input image signal;
Display program characterized by functioning