JP3809868B2 - Image conversion processing unit and image display apparatus having the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an image conversion processing unit that performs an interpolation process on an input image by an interpolation processing unit and generates an output image having a resolution different from that of the input image, and an image display apparatus using the image conversion processing unit. Relates to a technique for outputting images having different aspect ratios.
[0002]
[Prior art]
Conventionally, as this type of device, a frame memory that stores input image data, a coefficient storage unit that stores filter coefficients corresponding to a plurality of ratios in advance, a set area width, and a ratio set in each of a plurality of areas Based on the non-linear ratio control unit that outputs an enable signal for reading out the corresponding image data from the frame memory and outputs a coefficient selection address for reading out the corresponding filter coefficient from the coefficient storage unit, and the filter coefficient from the coefficient storage unit And a filter that filters image data from the frame memory and outputs image data that has been subjected to non-linear enlargement processing in the horizontal direction (see, for example, Patent Document 1).
[0003]
In the above apparatus, for example, when an input image having an aspect ratio of 4: 3 is displayed as an output image having an aspect ratio of 16: 9, filter coefficients are read based on a ratio set in each of a plurality of areas. Then, the image data subjected to the non-linear enlargement process is output by filtering based on the filter coefficient. Therefore, for example, it is possible to enlarge and display a panoramic photograph or a video image that passes through a fisheye lens.
[0004]
[Patent Document 1]
JP 2000-148128 A (FIGS. 1 and 4 to 6)
[0005]
[Problems to be solved by the invention]
However, the conventional example having such a configuration has the following problems.
That is, since the ratio is constant in each area in the conventional apparatus, the scale is stepwise as a whole. Therefore, a sudden change occurs at the boundary of each region, and there is a problem that the image is notched smoothly and the display is not smooth.
[0006]
Although it is conceivable to reduce the width of each region in the conventional apparatus, it is necessary to store a very large number of filter coefficients in the coefficient storage unit in order to perform filtering by setting a filter coefficient for each region. In addition, since many setting areas are provided and ratio data needs to be stored in accordance with the setting areas, the processing becomes very complicated, which is not realistic.
[0007]
The present invention has been made in view of such circumstances, and an image conversion processing unit that can convert a ratio into a linear image within each divided area and thereby convert the image into a smooth image. It is another object of the present invention to provide an image display apparatus using the same.
[0008]
[Means for Solving the Problems]
In order to achieve such an object, the present invention has the following configuration.
That is, the invention according to claim 1 is an image conversion processing unit that inputs an input image having a first aspect ratio and outputs an image converted to display a second aspect ratio via an interpolation processing unit. Receiving the stretch information including the resolution of the input image and the resolution of the output image, the number of divided image areas, and the ratio, and dividing the areas of both images into image areas according to the number of divided image areas, Divided image area information including the resolution and ratio of the area is output, and a divided image area designating unit that sequentially designates each divided image area as a processing target, and an interval from the pixel position of the adjacent output pixel for the output image It is calculated by the following algorithm as the arrangement interval information M output pixel adjusted to gradually larger or smaller or constant, depending on the ratio of the divided image area information A force pixel arrangement interval calculation unit,
Mns is the current start ratio, Key is a variable, Hno is the output image resolution, Q is a variable, Rest is a variable, dp is a variable, Mni is an intermediate ratio, Mns is a start ratio, and Q = If Hno,
M = Mns
Key = Q
Rest = Hno-1
dp = (Mni−Mns) × 2
After performing the initial setting
Only when the condition (Key-Q)> dp is satisfied,
M = M + 1 (however, if Mns> Mni, M = M−1)
dp = dp-1
Key = Key + dp-Rest
Seeking
Only if the above conditions are not met
Key = Key + dp
Seeking
Rest = Rest-1
Then , based on the output pixel arrangement interval information M in which the determination of the condition is repeatedly performed until Rest = 0, the pixel position interval of the output pixel with respect to the pixel position of the input pixel is set as the output pixel arrangement position. and the interpolation processing unit outputs pixel layout position information setting section for outputting to and sets as information, based on the position information of the output pixel and the arrangement interval information M of the output pixel, the interpolation processing unit pixel value A reference input pixel position update control unit for controlling update of a reference input pixel position referred to for determination, and sequentially processing each divided image area specified by the divided image area specifying unit To do.
[0009]
(Operation / Effect) The divided image area designating unit divides the input image and output image areas based on the stretch information, outputs divided image area information, and sequentially designates each divided image area as a processing target. go. In accordance with the designation, the output pixel arrangement interval calculation unit adjusts the interval from the pixel position of the adjacent output pixel for the output image gradually larger or smaller depending on the ratio of the divided image area information. Information M is calculated by the following algorithm . Further, the output pixel arrangement position information setting unit sets, as output pixel arrangement position information, an interval of the pixel position of the output pixel with respect to the pixel position of the input pixel based on the arrangement interval information of the output pixel. The reference input pixel position update control unit updates the reference input pixel position referred to by the interpolation processing unit to determine the pixel value of the output pixel based on the output pixel arrangement interval information and the output pixel arrangement position information. Control. By sequentially processing such processing for each divided image area, the ratio (also referred to as an enlargement ratio) can be linearly varied within each divided image area. Therefore, the input image can be converted into a smooth image while adjusting the aspect ratio.
The algorithm uses Mns as the current start ratio, Key as a variable, Hno as the output image resolution, Q as a variable, Rest as a variable, dp as a variable, Mni as an intermediate ratio, and Mns as a start ratio. And when Q = Hno,
M = Mns
Key = Q
Rest = Hno-1
dp = (Mni−Mns) × 2
After performing the initial setting
Only when the condition (Key-Q)> dp is satisfied,
M = M + 1 (however, if Mns> Mni, M = M−1)
dp = dp-1
Key = Key + dp-Rest
Seeking
Only if the above conditions are not met
Key = Key + dp
Seeking
Rest = Rest-1
After that, the above condition is repeatedly judged until Rest = 0.
[0010]
Further, it is preferable that the number of divided image areas in the stretch information is 4, and the ratio in each divided image area is a value that linearly decreases toward the outside of the output image.
[0011]
Moreover, it is preferable that the ratio of the stretch information is a start ratio and an intermediate ratio.
[0012]
(Operation / Effect) If the start ratio and the intermediate ratio are known, they can be obtained by calculation without knowing the end ratio. Therefore, the same processing can be performed while reducing the amount of stretch information.
[0013]
According to a fourth aspect of the present invention, there is provided an image display device comprising the image conversion unit according to any one of the first to third aspects.
[0014]
(Operation / Effect) The image display device can display an image based on an output image obtained by the image conversion unit and whose ratio is linearly adjusted in a plurality of regions.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing a schematic configuration of an image display device including an image conversion processing unit according to an embodiment of the present invention. In the following description, PDP refers to a plasma display panel.
[0016]
The image display apparatus according to this embodiment includes a signal processing unit 1, a microcomputer 3, an image conversion processing unit 5, a PDP driving unit 7, and a PDP 9.
[0017]
The signal processing unit 1 is provided with an input signal a1 relating to an input image having a first aspect ratio (for example, 4: 3) from a personal computer (hereinafter abbreviated as a personal computer) not shown. Further, it outputs it as a video signal a2 to the image conversion processing unit 5, and further outputs a synchronization signal a3 to the microcomputer 3 (hereinafter abbreviated as a microcomputer).
[0018]
The microcomputer 3 is given a microcomputer setting a4 by an on-screen display (OSD) or the like. The OSD displays a menu or the like on the PDP 9 in order to perform settings relating to display or the like for this image display device, and the user can make various settings in that state. The microcomputer 3 includes a parameter setting unit 3A. The parameter setting unit 3A stores stretch information a5 including at least the resolution of the input image, the resolution of the output image, the number of divided image areas, and the ratio. Some of these can be set by the user by the OSD.
[0019]
The stretch information a5 in the present embodiment is the input image resolution (input resolution) Hni, the output image resolution (output resolution) Hno, and the ratio of the input image to the output image, where n is the number of divisions of the image area of the input image. The start ratio Mns corresponding to the first ratio in the divided image region, the intermediate ratio Mni corresponding to the intermediate ratio, and the coefficient A are included. This is because if the start ratio Mns and the intermediate ratio Mni are known, they can be obtained by calculation without knowing the end ratio Mne. Therefore, the same processing can be performed while reducing the amount of stretch information. However, the end ratio Mne may be further included, or the end ratio Mne may be included instead of the intermediate ratio.
[0020]
The image conversion processing unit 5 includes a pixel arrangement position information calculation unit 11 and an interpolation processing unit 13. The pixel arrangement position information calculation unit 11 receives the stretch information a5 from the microcomputer 3, and outputs information that the interpolation processing unit 13 refers to in order to determine the pixel value, including the arrangement position information Z of the output pixel.
[0021]
The pixel arrangement position information calculation unit 11 includes a divided image region designation unit 11A, an output pixel arrangement interval calculation unit 11B, an output pixel arrangement position information setting unit 11C, and a reference input pixel position update control unit 11D.
[0022]
The divided image area specifying unit 11A receives the stretch information a5, and divides the area of the input image and the output image into image areas corresponding to the number n of divided image areas. Then, divided image area information b1 including the resolution and ratio of each divided image area is provided to the output pixel arrangement interval calculation unit 11B. Further, each divided image area is sequentially designated as a processing target. This divided image area information b1 is information about the corresponding divided image area in the stretch information a5 described above.
[0023]
The output pixel arrangement interval calculation unit 11B requests the next divided image region information from the divided image region designating unit 11A when performing the processing sequentially. For the output image, the interval from the pixel position of the adjacent output pixel is calculated as the arrangement interval information M of the output pixel that is gradually adjusted to be larger or smaller according to the ratio included in the divided image area information b1.
[0024]
Based on the output pixel arrangement interval information M, the output pixel arrangement position information setting unit 11C sets the pixel position interval of the output pixel with respect to the pixel position of the input pixel as the output pixel arrangement position information Z, and outputs this output pixel. The pixel arrangement position information Z is output to the interpolation processing unit 13.
[0025]
The reference input pixel position update control unit 11D, based on the output pixel arrangement interval information M and the output pixel arrangement position information Z, determines the reference input pixel position to which the interpolation processing unit 13 refers to determine the pixel value. Control updates. Specifically, when the position of the reference input pixel is updated, the reference input pixel position update control information b2 is output to the interpolation processing unit 13.
[0026]
The interpolation processing unit 13 includes a pixel arrangement position determining unit 13A and a pixel value determining unit 13B. The pixel arrangement position determination unit 13A determines the arrangement position of the output pixel based on the arrangement position information Z of the output pixel, the reference input pixel position update control information b2, and the video signal a2. The pixel value determining unit 13B determines the pixel value at the determined arrangement position of the output pixel. Examples of methods for determining the pixel value at this time include various methods such as those based on linear interpolation and interpolation curves. Preferably, as in Japanese Patent No. 3272309, linear interpolation is performed, and the standard linear interpolation and the standard linear interpolation are partially translated according to the difference between the output pixel arrangement position and the pixel value of the input pixel. Switch between the interpolated interpolation. Thereby, an appropriate interpolation process is possible.
[0027]
The PDP driver 7 drives the PDP 9 based on the signal received from the image conversion processing unit 5. Thereby, an input image having a first aspect ratio (for example, 4: 3) is displayed on the PDP 9 as an output image having a second aspect ratio (for example, 16: 9).
[0028]
Reference is now made to FIG. FIG. 2 is a schematic diagram showing the relationship between the input pixels of the input image and the output pixels of the output image, where (a) shows the input image, (b) shows the output image, and (c). Indicates a ratio.
[0029]
Here, as shown in FIG. 2A, the number of divided image areas n = 1 to 4 (however, an integer), the divided image area 1 and the divided image area 4 located at both ends of the image have the same size, The divided image area 2 and the divided image area 3 positioned on the center side of the divided image area have the same size. That is, when the resolution of the divided image area 1 is H1i, the resolution of the divided image area 2 is H2i, the resolution of the divided image area 3 is H3i, and the resolution of the divided image area 4 is H4i in the input image, H1i = H4i, H2i = H3i.
[0030]
Further, as shown in FIG. 2B, the same applies to the output image. Among the output images, the resolution of the divided image region 1 is H1o, the resolution of the divided image region 2 is H2o, the resolution of the divided image region 3 is H3o, When the resolution of the divided image area 4 is H4o, H1o = H4o and H2o = H3o.
[0031]
The ratio is set as shown in FIG. 2C, for example.
That is, the divided image region 1 increases linearly from the start ratio M1s to the intermediate ratio M1i (or end ratio M1e). Hereinafter, the divided image area 2 increases linearly from the start ratio M2s to the intermediate ratio M2i (or the end ratio M2e), and the divided image area 3 is changed from the start ratio M3s to the intermediate ratio contrary to the divided image area 2. M3i (or the end ratio M3e) decreases linearly, and the divided image region 4 decreases linearly from the start ratio M4s to the intermediate ratio M4i (or end ratio M4e). In other words, the ratio in each divided image region is a value that linearly decreases toward the outside of the output image.
[0032]
Here, the relationship between the input pixel and the output pixel will be described with reference to FIG. FIG. 3 is a schematic diagram showing an arrangement relationship between input pixels and output pixels.
[0033]
In this example, the number of input pixels is 10, the number of output pixels is 16, and the input pixels are equally divided by N = 16. Further, although the case where the start ratio Mns = 8 and the intermediate ratio Mni = 10 is shown, the interval between the input pixels is constant, whereas the interval between the output pixels (output pixel arrangement interval information) M is set. The line gradually increases from 8 to 12.
[0034]
In this example, the intermediate ratio M1i in the divided image area 1 (= the intermediate ratio M4i in the divided image area 4) can be expressed as A × H1i / H1o, and the end ratio M1e can be expressed as 2 × (M1i−M1s). The intermediate ratio M2i in the divided image area 2 (= intermediate ratio M3i in the divided image area 3) can be expressed as A × H2i / (Ho / 2−H1o).
[0035]
Reference is now made to FIG. FIG. 4 is a flowchart showing the flow of the main part of the process. Here, Q = Hno, coefficient A = 16, and variables Key, dP, and Rest are used for convenience of processing. This process represents a process after the output pixel arrangement interval calculation unit 11B sequentially receives 1 to 4 (integer) as the divided image region information b1 from the divided image region specifying unit 11A.
[0036]
Step S1
The current start ratio Mns is set as the output pixel arrangement interval information M. Also, a variable Q (= output image resolution Hno) is set in the variable Key, and an output image resolution Hno-1 is set in the variable Rest. Further, (Mni−Mns) × 2 is set in the variable dP. That is, the variable dP represents the end ratio Mne in the divided image area. The variable Rest is used as a counter for processing for determining whether or not it is the end of the designated divided image area, as will be apparent from the steps described later.
[0037]
Step S2
It is determined whether or not the arrangement interval information M is to be changed. Specifically, the determination is made by comparing (Key-Q) with dP.
[0038]
Step S3
As a result of the above determination, if the arrangement interval information M is not changed, the variable Key = Key + dP is set.
[0039]
Step S4
Let the variable Rest = Rest-1.
[0040]
Step S5
Output pixel arrangement interval information M at this time is output.
[0041]
Step S6
Processing branches depending on whether the variable Rest is 0 or not. That is, when the variable Rest = 0, it is the end of the divided image region, so the processing in this region is terminated and the processing is shifted to the next divided image region. On the other hand, if the variable Rest is not 0, the process returns to step S2 to process the next pixel in the divided image area.
[0042]
Note that, as a result of the determination in step S2, if the output pixel arrangement interval information M is changed, the process proceeds from step S2 to step S7.
[0043]
Step S7
Here, the output pixel arrangement interval information M is incremented by 1, and the variable dP is decremented. Further, a variable Key = Key + dP−Rest is set. Then, the process proceeds to step S4. In this process, the output pixel arrangement interval information M is incremented and the variable dP that functions as a counter in the height direction is decremented. Note that the inclination is determined, and if the inclination is negative (Mns> Mni), the output pixel arrangement interval information M is decremented.
[0044]
Through the above processing, the output pixel arrangement interval calculation unit 11B sequentially outputs the output pixel arrangement interval information M and provides it to the output pixel arrangement position information setting unit 11C and the reference input pixel position update control unit 11D. Note that the output pixel arrangement interval information M sequentially obtained is linearly large (or small). Also, this may be constant.
[0045]
The output pixel arrangement position information setting unit 11C obtains and outputs the output pixel arrangement interval information Z according to the arrangement interval information M of the output pixels given sequentially. Further, the reference input pixel position update control unit 11D controls the update of the reference input pixel position to be referred to based on the output pixel arrangement interval information Z and the output pixel arrangement interval information M. Information b2 is output.
[0046]
Here, a specific example of the output pixel arrangement interval information Z is shown.
For example, it is assumed that the output pixel arrangement interval information M is sequentially determined for the input pixels G1 to G10 by the above processing as shown in FIG. The output pixel arrangement position information setting unit 11C sets the arrangement interval information Z = 0 because the output pixel H1 is at the same position as the input pixel G1. Further, since the output pixel H2 is shifted from the input pixel G1 to the input pixel G2 by the arrangement interval information M = 8 of the output pixel H2, the arrangement interval information Z is set to Z = 8, and the output pixel H3 is Since it is the same position as the input pixel G2, the arrangement interval information Z = 0. Further, since the output pixel H4 is a position shifted from the input pixel G2 to the input pixel G3 by the arrangement interval information M = 8 of the output pixel H4, the arrangement interval information Z is set to Z = 8. The output pixel arrangement interval information Z is sequentially obtained by such a procedure.
[0047]
Next, a specific example of the reference input pixel position update control information b2 is shown.
For example, with respect to the input pixels G1 to G10, it is assumed that the arrangement positions of the output pixels H1 to H16 are determined at the output pixel arrangement position Z as shown in FIG. Then, the pixel value of the output pixel H1 is determined by referring to the pixel value of the first input pixel G1 as a reference. The output pixel H2 is based on the first input pixel G1, and the pixel value is determined by referring to the pixel value of the second input pixel G2. The output pixel H3 is the pixel value of the second input pixel G2. The pixel value is determined by referring to. Further, the pixel value of the output pixel H4 is determined by referring to the pixel value of the third input pixel G3 with reference to the second input pixel G2. At this time, the reference input pixel position update control information b2 is output when the input pixel referred to as the reference changes. That is, in the above example, since the reference is switched from the input pixel G1 to the input pixel G2 at the output pixel H3, the reference input pixel position update control information b2 is output. In this way, the reference input pixel position update control information b2 is sequentially obtained.
[0048]
An example in which output pixel arrangement interval information M, arrangement position information Z, reference input pixel position update control information b2, and the like obtained from the above processing are listed for each of the four divided image areas is shown in FIG. -Shown in the table of FIG.
[0049]
The pixel arrangement position determination unit 13A is provided with the arrangement position information Z and the reference input pixel position update control information b2 as described above, and determines the pixel arrangement position of the actual output pixel based on these. Then, the pixel value determining unit 13B determines a pixel value according to the pixel arrangement position, and outputs an image having a second aspect ratio (for example, 16: 9) to the PDP driving unit 7.
[0050]
As described above, the divided image area specifying unit 11A divides the input image area and the output image area based on the stretch information a5, outputs the divided image area information b1, and sequentially processes the divided image areas 1 to 4 as processing targets. I will specify. In accordance with the designation, the output pixel arrangement interval calculation unit 11B adjusts the interval from the pixel position of the adjacent output pixel to be gradually increased or decreased or constant according to the ratio of the divided image area information b1. Calculated as information M. Further, the output pixel arrangement position information setting unit 11C sets the interval between the pixel positions of the output pixels and the pixel positions of the input pixels as the output pixel arrangement position information Z based on the arrangement interval information M of the output pixels. The reference input pixel position update control unit 11D is based on the output pixel arrangement interval information M and the output pixel arrangement position information Z, and the reference input pixel position to which the interpolation processing unit 13 refers to determine the pixel value of the output pixel. Control the update of By sequentially processing such processing for each of the divided image areas 1 to 4, the ratio can be linearly changed in each of the divided image areas 1 to 4, and a smooth image can be obtained while adjusting the aspect ratio of the input image. Can be converted.
[0051]
In addition, this invention is not limited to the Example mentioned above, A deformation | transformation implementation is possible as follows.
[0052]
(1) Instead of obtaining the output pixel arrangement interval information M according to the flow of FIG. 4 described above, the calculation may be performed as described below. Reference is now made to FIG. In addition, it is a graph which shows the example in the case of calculating | requiring arrangement | positioning space | interval information of FIG. 9 by a calculation.
[0053]
If the arrangement position of the output pixel is Xni and the arrangement interval information to be obtained is Mny,
Mny = {(Mni−Mns) × 2 / Hno} × Xni + Mns
It can be calculated by the following formula. You may make it obtain | require arrangement | positioning space | interval information M with this numerical formula. Thus, the ratio can be changed more linearly in each divided image area. Depending on the calculation result, the output pixel may be obtained at a position that does not coincide with the physical pixel position of the PDP 9, but this may be adjusted by the interpolation processing unit 13.
[0054]
(2) In the above-described embodiment, the image display device provided with the PDP 9 has been described as an example. However, the present invention can also be applied to a liquid crystal display device other than the PDP 9.
[0055]
【The invention's effect】
As is apparent from the above description, according to the present invention, the divided image area designating unit divides the input image and output image areas based on the stretch information, outputs divided image area information, and processes each divided image as a processing target. Specify image areas sequentially. According to the designation, the output pixel arrangement interval calculation unit obtains the output pixel arrangement interval information in which the interval from the pixel position of the adjacent output pixel is gradually adjusted to be larger or smaller or constant according to the ratio of the divided image area information. Only when the condition (Key-Q)> dp is satisfied . Further, the output pixel arrangement position information setting unit sets the interval of the pixel position of the output pixel with respect to the pixel position of the input pixel as the arrangement position information of the output pixel based on the arrangement interval information of the output pixel. The reference input pixel position update control unit controls updating of the reference input pixel position that is referred to by the interpolation processing unit to determine the pixel value of the output pixel based on the output pixel arrangement interval information and the output pixel arrangement position information. To do. By sequentially processing such processing for each divided image region, the ratio can be linearly varied in each divided image region, and the image can be converted into a smooth image while adjusting the aspect ratio of the input image.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a schematic configuration of an image display device including an image conversion processing unit according to an embodiment.
FIG. 2 is a schematic diagram showing the relationship between input pixels of an input image and output pixels of an output image, where (a) shows an input image, (b) shows an output image, and (c) shows a ratio. Indicates.
FIG. 3 is a schematic diagram showing an arrangement relationship between input pixels and output pixels.
FIG. 4 is a flowchart showing the flow of the main part of processing.
FIG. 5 is a table showing an example of stretch information and arrangement position information for the first divided image region.
FIG. 6 is a table showing examples of stretch information, arrangement position information, and the like for the second divided image region.
FIG. 7 is a table showing examples of stretch information, arrangement position information, and the like for the third divided image region.
FIG. 8 is a table showing examples of stretch information, arrangement position information, and the like for the fourth divided image region.
FIG. 9 is a graph illustrating an example of obtaining arrangement interval information by calculation.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Signal processing part 3 ... Microcomputer 5 ... Image conversion processing unit 11 ... Pixel arrangement position information calculation part 13 ... Interpolation processing part 11A ... Divided image area designation | designated part 11B ... Output pixel arrangement space | interval calculation part 11C ... Output pixel arrangement position information setting Unit 11D: reference input pixel position update control unit 13A: pixel arrangement position determination unit 13B: pixel value determination unit M: output pixel arrangement interval information Z: output pixel arrangement position information a1: input signal a2: video signal a3: synchronization Signal a4 ... microcomputer setting a5 ... stretch information b1 ... divided image area information b2 ... reference input pixel position update control information Hni ... input resolution Hno ... output resolution Mns ... start ratio Mni ... intermediate ratio

Claims (4)

In an image conversion processing unit that inputs an input image of a first aspect ratio and outputs an image converted to display a second aspect ratio via an interpolation processing unit,
Receiving the stretch information including the resolution of the input image, the resolution of the output image, the number of divided image areas, and the ratio, the area of both images is divided into image areas corresponding to the number of divided image areas, and each divided image area A divided image area designating unit that outputs divided image area information including resolution and ratio, and sequentially designates each divided image area as a processing target;
For the output image, the output calculated by the following algorithm as the output pixel arrangement interval information M in which the interval from the pixel position of the adjacent output pixel is adjusted to be gradually increased, decreased, or constant in accordance with the ratio of the divided image region information A pixel arrangement interval calculation unit;
Mns is the current start ratio, Key is a variable, Hno is the output image resolution, Q is a variable, Rest is a variable, dp is a variable, Mni is an intermediate ratio, Mns is a start ratio, and Q = If Hno,
M = Mns
Key = Q
Rest = Hno-1
dp = (Mni−Mns) × 2
After performing the initial setting
Only when the condition (Key-Q)> dp is satisfied,
M = M + 1 (however, if Mns> Mni, M = M−1)
dp = dp-1
Key = Key + dp-Rest
Seeking
Only if the above conditions are not met
Key = Key + dp
Seeking
Rest = Rest-1
Then , based on the output pixel arrangement interval information M in which the determination of the condition is repeatedly performed until Rest = 0, the pixel position interval of the output pixel with respect to the pixel position of the input pixel is set as the output pixel arrangement position. An output pixel arrangement position information setting unit that is set as information and output to the interpolation processing unit;
Based on the output pixel arrangement interval information M and the output pixel arrangement position information, the reference input pixel position update control for controlling the update of the reference input pixel position to which the interpolation processing unit refers to determine the pixel value With
An image conversion processing unit that sequentially processes each divided image area designated by the divided image area designating unit. The image conversion processing unit according to claim 1,
The number of divided image areas in the stretch information is 4, and the ratio in each divided image area is a value that linearly decreases toward the outside of the output image. The image conversion processing unit according to claim 1 or 2,
An image conversion processing unit characterized in that a ratio of the stretch information is a start ratio and an intermediate ratio. An image display apparatus comprising the image conversion processing unit according to claim 1.

Images