JP2003099021A - Device, method, program, and storage medium for displaying picture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct misalignment of a picture in an expansion display area when displaying a plurality of related pictures. SOLUTION: A parameter setting part 2 calculates a parameter for performing coordinate transformation between two pictures from two kinds of picture signals (present picture and past picture) so that anatomical positions in the pictures are aligned. A picture composition part 4 converts resolution of each picture so that the picture signals of the present and past pictures can be displayed on the same screen, and outputs the signals to a display part 6. Moreover, an area specifying part 5 specifies an area for expansion-displaying the present picture or the past picture. The picture composition part 4 uses the coordinate transformation parameter set by the parameter setting part 2, and transforms coordinate values in the expansion-display area into those in the past picture. The picture composition part 4 composes the expansion display area with a resolution higher than the original one or that of the other part specified separately, and outputs it to the display part 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device, an image display method, a program, and a storage medium.

[0002]

2. Description of the Related Art Radiation (X rays, α rays,
When irradiated with β rays, γ rays, electron rays, ultraviolet rays, etc., a part of this radiation energy is accumulated in the phosphor. It is known that when this phosphor is irradiated with excitation light such as visible light, the phosphor emits stimulated emission depending on the stored energy. It is called the body (stimulable phosphor). Using this stimulable phosphor, the radiation image information of a subject such as a human body is once recorded on a stimulable phosphor sheet, and the stimulable phosphor sheet is scanned with excitation light such as laser light to stimulate emission. To generate light,
An image signal is obtained by photoelectrically reading the obtained stimulated emission light, and a recording material such as a photographic light-sensitive material based on the image signal,
The present applicant has already proposed a radiation image information recording / reproducing system for outputting a radiation image of a subject as a visible image on a display device such as a CRT (Japanese Patent Laid-Open No. 55-1242).
No. 9 and No. 56-11395. Further, in recent years, an apparatus for similarly capturing an X-ray image using a semiconductor sensor has been developed. These systems have the practical advantage of being able to record images over a very wide radiation exposure area as compared to conventional radiographic systems using silver halide photography. That is,
An X-ray having a very wide dynamic range is read by a photoelectric conversion unit and converted into an electric signal, and the electric signal is used to output a radiation image as a visible image on a recording material such as a photographic photosensitive material or a display device such as a CRT. This makes it possible to obtain a radiation image that is not affected by variations in radiation exposure dose.

In this way, the output image from the modality is digitized and the chance of being treated as a digital image increases, so that the image display apparatus can realize the display function which is difficult to observe by the conventional film. Has become. FIG. 13 shows a plurality of images displayed on a display device such as a CRT and only a part of them is enlarged and displayed in an overlapping manner. Such a function is often called a magnifying glass.

In the figure, two images, that is, a past image and a current image of the same subject, are displayed on the screen, and only a part of them is enlarged. Such a display form is particularly effective for subsequent follow-up, when an abnormal shadow or the like has been recognized in the past.

However, in the past image and the current image, the positions of the imaged parts in the images are generally different due to changes in the posture of the subject, so that the same parts are displayed even if the enlarged display position is the same in each image. It may not be included in the area. In such a case, the observer needs to perform observation while comparing the plurality of images and adjusting the position of the enlarged region.

[0006] In addition, since a medical image usually has a high resolution and bit precision, the data amount thereof becomes extremely large, but with the spread of electronic medical images in the future,
These image data need to be transmitted and displayed promptly.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and when a plurality of related images is displayed, it is possible to correct the positional deviation of the image in the enlarged display area. To aim.

[0008]

In order to achieve the object of the present invention, for example, an image display device of the present invention has the following configuration.

That is, an image display device for displaying at least one image among a plurality of images related to each other on a predetermined display means, and image input means for inputting image data of the plurality of images related to each other. And a coordinate transformation parameter calculation means for obtaining a parameter for performing coordinate transformation of a corresponding portion between the plurality of mutually related images, and an enlarged display with respect to the first image in the plurality of mutually related images. An instructing means for instructing an area to be displayed, an area calculating means for obtaining an enlarged display area in the second image corresponding to the enlarged display area in the first image instructed by the instructing means using the parameter, Enlarging means for enlarging and enlarging the enlarged display area in the first image and the second image and displaying the enlarged image on the display means.

The coordinate conversion parameter means further includes a reduced image generating means for generating reduced images of at least one of the plurality of images associated with each other, and the first image by the reduced image generating means. A first reduced image of the first image and a second reduced image of the second image to obtain a first parameter indicating a rough shift between the first image and the second image. Parameter calculation means,
A search region is set in the first image, a region corresponding to the search region is obtained using the first parameter, the obtained region is set in the second image, and the first image is set. A second parameter for performing coordinate conversion between coordinates of the search area of the first image and coordinates of the search area of the second image using the search area of the image and the search area of the second image And a second parameter calculation means for obtaining
The second parameter is used as the coordinate conversion parameter.

The image forming means further comprises an image forming means for forming the resolution of the first image and the second image into a resolution that can be displayed on the display means.

The image input means inputs, as image data of the plurality of images associated with each other, a file including a code string hierarchically encoding the image and a header corresponding to the code string, and further, Decoding means for decoding the code string is provided.

The decoding means performs entropy decoding on the code string to restore a quantization index, and dequantization on the quantization index to restore a transform coefficient. Conversion means and inverse frequency conversion means for performing an inverse frequency conversion on the conversion coefficient to restore an image signal.

Further, a difference image generating means for generating a difference image between the first image and the second image is provided.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail according to preferred embodiments with reference to the accompanying drawings.

[First Embodiment] FIG. 1 is a block diagram showing the functional arrangement of an image display apparatus according to this embodiment. In the image display device shown in the figure, the image data input from the image data input unit 1 is displayed on the display unit 6. Here, the image data input unit 1 is an image pickup device that generates an X-ray image as described above, a network, a predetermined storage device, or the like, and the display unit 6 is an electronic display device such as a CRT monitor. In this configuration, the display unit 6 is shown in FIG.
It is assumed that a plurality of related images such as a past image and a current image are displayed as shown in FIG.

Here, in the present embodiment, it is assumed that the images to be displayed are the past image and the current image, but the present invention is not limited to this, and it is possible to display two or more past images. However, the same processing can be applied to the number of images. The operation of each unit will be described below with reference to FIG.

The two types of image data (current image and past image) input from the image data input unit 1 are input to the image memory 3 and the parameter setting unit 2. Here, the image data is a digital image signal sequence having a predetermined resolution and bit precision. As shown in FIG. 2, it is assumed that the image data is read in a form in which headers H1 and H2 are added to the digital image signals D1 and D2 of the past image and the current image, respectively, and are collected as one file. The main header MH is information relating to a plurality of image data included in the file, and each header contains shooting conditions and the like.
It contains information about the image to which it is attached.

Note that these image signals do not have to be put together in one file. In this case, the image data input unit 1 reads in a file containing each related image signal.

The parameter setting unit 2 calculates and stores parameters for performing coordinate conversion between two images so that anatomical parts in the images are aligned from the two types of input image signals. . FIG. 3 is a diagram showing a basic configuration of the parameter setting unit 2. In the tone correction unit 201, the two types of image signals input in the figure are tone-corrected so that the pixel value distribution ranges are substantially equal. The reduced image generation unit 202 generates reduced images of the respective images (past image and current image). The method of generating the reduced image will be described below with reference to FIG.

FIG. 4 shows the structure of the transform coefficients generated by the reduced image generator 202. The image signal is decomposed into coefficient groups (hereinafter referred to as subbands) relating to different frequency bands. In the figure, seven subbands, LL, HL2,
It is decomposed into LH2, HH2, HL1, LH1, and HH1. In the present embodiment, it is assumed that the two-dimensional discrete wavelet transform is executed and the LL subbands are recursively decomposed into a predetermined number of levels. Since the details of the two-dimensional discrete wavelet transform are known techniques, detailed description thereof will be omitted.

In the figure, the LL subband (denoted by LL in the figure) has the property of being a reduced image of the original image, so the coefficient group contained in this LL subband is used as a reduced image. The reduced images (the coefficient group included in the LL subband) of the respective images generated by the reduced image generation unit 202 are stored in the coefficient memory 203 together with the coefficients included in the other subbands. The method for generating the reduced image is not limited to the discrete wavelet transform, and other methods may be used.

The coefficient memory 203 stores sub-bands relating to two types of images. The stored sub-band of the lowest frequency band (indicated by LL in FIG. 4) is stored in the subsequent correlation calculator 204 in the mutual correlation unit 204. Used to calculate the correlation. As a result of this cross-correlation calculation, a rough displacement between the two images is calculated. The calculated displacement is stored in a memory (not shown). This rough displacement is a first coordinate conversion parameter indicating a rough displacement between the two images. For example, the point of coordinates (100, 100) in the current image is the point of coordinates (110, 120) in the past image. , The difference (10, 20) becomes the first coordinate conversion parameter.

Further, the gradation-corrected image signal is input to the correlation calculation unit 204, and local search areas are set in the two images. Specifically, some search areas are set in the current image, and areas corresponding to these some search areas are also set in the past image. When the area corresponding to the target search area in the current image is set in the past image, the position of the area (in the past image) is obtained as a result of adding the first coordinate conversion parameter to the position of the target area in the current image. be able to.

Then, a cross-correlation operation is calculated for each corresponding search area in the current image and the past image, and a first point for determining at which coordinate in the other image the point corresponding to one point in the other image is found. Two coordinate conversion parameters can be obtained. Hereinafter, the second coordinate conversion parameter thus obtained will be simply referred to as coordinate conversion parameter.

FIG. 5 shows a state in which an arbitrary point x in the current image is converted into an anatomically corresponding point x'in the past image, and x to x'is calculated using coordinate conversion parameters. can do.

For details of the method of performing registration between two images in this way, see, for example, A. Kano et al, "Digit.
al image subtraction of temporally sequential ches
t images for detection of interval change ", Med.Ph
Since it is described in ys., 21, 3 (1994), detailed description is omitted.

The obtained coordinate conversion parameter is stored in the parameter memory 205.

On the other hand, the image signal input to the image memory 3 is output to the image forming section 4. The image configuration unit 4 converts the resolution of each image so that the input image signals of the current image and the past image can be displayed on the same screen, and outputs the converted image signals to the display unit 6. For example, the display unit 6 is a monitor having a resolution of 1280 × 1024, and the resolution of each image is 2000 × 20.
If it is 00, the image forming unit 4 reduces the resolution of each image to 1000 × 1000, which is half, and outputs the image. A known technique such as the cubic spline method is used as the reduction method.

FIG. 6 shows a state in which an image is output to the display unit 6 at this time, and the reduced current image and past image are displayed side by side. Further, in the figure, a plurality of display command buttons are arranged below the image, and the user can partially enlarge the image by placing the mouse cursor on the enlarged display button and clicking the button. Next, the operation when the image is partially enlarged is described.

When the enlargement display button is clicked, the area designating unit 5 requests the user to specify which portion of the current image or the past image is to be enlarged and displayed. The designation may be designated by a mouse on the screen, or the coordinate values on the image may be directly input by a keyboard. The mouse and keyboard are included in the area designating section 5. The coordinates of the designated area are the image composition unit 4
Is output to. In the present embodiment, as shown in FIG. 6, it is assumed that the region of interest to be enlarged and displayed in the current image is designated.

The image construction unit 4 receives from the parameter setting unit 2
The coordinate conversion parameter previously stored in the parameter memory 205 is read, and the coordinate value of the enlarged display target area is converted into the coordinate value in the past image by using this.

The image forming unit 4 uses the coordinates p designated by the user as a reference for the current image, and the image signals in the designated region for the past images based on the coordinates p'corrected by the above-mentioned conversion parameters. An output image is formed at the original resolution or a resolution that is separately designated and is higher than the entire displayed portion, and is output to the display unit 6.

FIG. 7 shows an example of image display on the display unit 6 at this time, in which only the region of interest designated in FIG. 6 is enlarged and displayed as an overlay on the other region. In the figure, p is the position designated by the user,
p'is the position corrected by the conversion parameter.

Since p'is a position corresponding to p in the past image, enlarged images of the same region are displayed as overlays on both images, and it is possible to easily observe the temporal change of the same portion in the lung field.

[Second Embodiment] In the first embodiment, the image data is directly input to the image memory 3, but
Since medical images have high resolution and bit accuracy, they may be compression-encoded in order to reduce costs when storing, storing, and transmitting them. In the present embodiment, an image display device that decodes and displays this code string when the image data input from the image data input unit 1 is compression-encoded will be described.

FIG. 14 shows a functional configuration of the image display device according to this embodiment. The same parts as in FIG. 1 are given the same numbers. As described above, in the present embodiment, the output of the image data input unit 1 is a code string obtained by compressing an image, and the code string is input to the decoding unit 7. Here, as the compression encoding method, it is assumed that a hierarchical encoding method, in particular, a discrete wavelet transform is used, and in the present embodiment, ISO / IEC 15444 (hereinafter JPEG2000) is used. . However, the present invention is not limited to this and can be applied by other hierarchical encoding methods.

FIG. 8 (A) shows an outline of the structure of the code string in this embodiment. As shown in the figure, the code string starts with the main header MH including the size of the image to be coded, information about the component, etc., and the coded data BS is arranged following the tile part header TH. The encoded data is divided into a plurality of layers, each of which includes a packet and its header. In this embodiment, since the image is not tile-divided, the tile part header TH and the encoded data B
S is composed of one. Although one input file corresponds to the code string of one image in FIG. 8A, a plurality of related images may be included in one file as shown in FIG. 8B. In this case, for example, one file contains the code strings of the past image and the current image of the same subject. It should be noted that although the difference between the configurations of the code strings will not be described in the following description, the same process as that for one code string may be repeated even when the file is composed of a plurality of code strings.

In JPEG2000, a plurality of types of code strings can be formed, but in this embodiment, the layer-resolution level-component-position is available.
Shall be used. However, it is also applicable to other configurations.

FIG. 9 shows the basic configuration of the decoding unit 7. The file including the code string of the image is the code string analysis unit 70.
Input to 1. Then, the code string analysis unit 701 refers to the main header MH included in the file, reads a quantization step used for dequantization described below, and outputs the read quantization step to the dequantization unit 703 described below.

The code string is decoded in the entropy decoding unit 702, and the quantization index is restored. The quantization index is inversely quantized by the inverse quantization unit 703 using the above quantization step, and the discrete wavelet transform coefficient is restored. The inverse discrete wavelet transform unit 704 performs an inverse discrete wavelet transform on the restored discrete wavelet transform coefficient to restore an image signal.
Here, when the compression encoding is performed reversibly (when the quantization step is 1), the inverse quantization unit 703 does not perform the inverse quantization. JPEG20 for detailed operation of each part
00 Details are omitted because they are detailed in the standard.

The decoding unit 7 decodes the input code string to generate an image signal. First, as shown in FIG. 10, only the code related to a predetermined layer is entropy decoded, and the code string is temporarily stored in the code memory 8. To be done. At this time, the layer to be entropy-decoded corresponds to a predetermined compression rate and is related to the pixel accuracy required for the alignment parameter calculation described later. That is, in order to reduce the file size of the image signal to be restored, the number of layers to be decoded may be reduced, but the image quality (pixel accuracy) will deteriorate. Therefore, the layer to be decoded is determined according to the compression rate and the pixel accuracy obtained. Control of this operation is performed by a control unit (not shown) that controls the overall operation of the image processing apparatus shown in FIG.

The data of the decoded layer is used for the inverse quantizer 7
Inverse quantization is performed in 03 to output coefficient data, and the coefficient data is output to the inverse discrete wavelet transform unit 704 and the parameter setting unit 2. The coefficient data output to the inverse discrete wavelet transform unit 704 is inversely transformed by a predetermined number of levels to restore an image signal and output to the image memory 3.

Here, the number of levels of the inverse conversion is controlled so that the resolution of the image restored thereby becomes appropriate when displayed on the display section 6. That is, in the first embodiment, the resolution is converted in the image constructing unit 4, but in the present embodiment, the image signal output from the decoding unit 7 has a resolution suitable for display (displayable resolution on the display unit 6). Has been adjusted to.

On the other hand, the coefficient data output to the parameter setting unit 2 is input to the coefficient memory 203 and temporarily stored as shown in FIG. The above processing is performed for each of the two types of images, and as a result, the coefficient memory 203 stores coefficient data relating to the two images.

Further, the coefficient data relating to the LL subband is outputted from the coefficient memory 203 to the correlation calculating section 204,
The correlation calculator 204 aligns the two images in the same manner as in the first embodiment. Further, the second coordinate conversion parameter is obtained by using the image signal of the display resolution previously stored in the image memory 3. The obtained coordinate conversion parameter is stored in the parameter memory 205.

Subsequent operations are the same as those in the first embodiment, and when a plurality of images are displayed on the screen as shown in FIG. The position is corrected so that the same part is enlarged.

However, in the present embodiment, since the decoding is performed at a low resolution, it is necessary to partially decode the image at a high resolution for the area designated portion. Therefore, the decoding unit 7 reads out a code of a necessary portion from the code string previously stored in the code memory 8, decodes it at a high resolution, and outputs it to the image forming unit 4.

Here, when decoding only a part of the image, in JPEG2000, as shown in FIG. 11, the unit is a tile obtained by dividing the image into rectangular regions and a code block obtained by dividing the subband by the discrete wavelet transform. It is possible. In the figure (A),
Only coded data relating to the tile corresponding to the designated area is read from the code memory 8 and decoded, while in (B) the coded data of the code block relating to the designated area is read and decoded, A magnified image of a portion of the image is generated. At this time, it goes without saying that the number of levels of the inverse discrete wavelet transform in the decoding process becomes larger than the number of levels when the entire image was previously displayed.

Further, according to the method described above, since only a predetermined layer is decoded in advance to restore the image signal, decoding and display can be speeded up, but it is necessary to restore a more accurate image. If there is, all layers may be decoded.

[Third Embodiment] In the above-described embodiment, a plurality of images are displayed on the display unit 6. However, data obtained by taking a difference between these images is imaged and simultaneously displayed. It may be displayed and the correspondence of the same part may be taken.

FIG. 15 shows the functional arrangement of the image display apparatus according to this embodiment. The functional configuration shown in the figure is a configuration in which a differential image processing unit 9 is added to the functional configuration of the image display device in the second embodiment, and the same parts as those shown in FIG. 14 are denoted by the same numbers. .

The differential image processing unit 9 reads out two types of image data, for example, a current image and a past image, from the image memory 3, and corrects the pixel position of the current image using the coordinate conversion parameters stored in the parameter setting unit 3. Then, the image is generated by calculating the difference from the past image.

The generated difference image is output to the image constructing section 4, and the image constructing section 4 simultaneously displays these three types of images as shown in FIG. Here, when performing the partial enlarged display of the image as described above, the coordinate values are corrected so that the enlarged display positions between the images are the same portion. In the same figure, p, p ′, and p ″ correspond to the same position-corrected parts.

By performing the display in this way, it is possible to simultaneously display changes over time in a specific region of the same subject, and observe a portion where a change is seen in the difference image in correspondence with the position of the actual image. it can.

Note that the functional configuration shown in FIG. 15 is a configuration when the input image data is compression-encoded, and when the input image data is not compression-encoded, the functional configuration shown in FIG. From the functional configuration, the decoding unit 7 and the encoding memory 8
May be deleted.

[Fourth Embodiment] In the above-described embodiments, the transform coding using the discrete wavelet transform is used as the image compression method. However, the discrete cosine transform is used as the transform method, and the transform coefficients are hierarchical. It may also be based on an encoding method.

[Fifth Embodiment] In the above embodiments, the area in which a part of the image is enlarged and displayed is position-corrected in a plurality of images, but other information may be displayed.

For example, in FIG. 7, by increasing the number of layers to be decoded together with the resolution for the enlarged display portion, the enlarged display portion can be displayed with higher image quality. This is because after decoding the coded data of more layers for the tile corresponding to the designated area in FIG. 11 or reading all the coded data, more for the corresponding code blocks. This can be realized by decoding the encoded data related to the encoding pass of.

Further, it is possible to perform predetermined image processing on the designated area instead of enlarging the display. For example, an image in which DR compression and blur mask processing have been performed on a designated area is generated, and at this time, these processing are
It may be performed by the image forming unit in FIG. 2 or may be realized by performing non-linear conversion on the discrete wavelet transform coefficient restored by the inverse quantization unit 703 of the decoding unit 7.

Further, the result of performing some image analysis processing on the designated area may be displayed. For example, in a chest X-ray image, a tumor shadow extraction process may be performed on an image signal in a designated area and the display form may be displayed in pseudo color.

By switching these display forms by another instruction means, it is possible to display the information according to the purpose while superimposing it on the image. By doing so, it becomes possible to appropriately display the same region in regions of interest in a plurality of images under conditions suitable for observation.

[Other Embodiments] Furthermore, the present invention is not limited only to the apparatus and method for realizing the above-mentioned embodiment, and the above-mentioned system or the computer (CPU or MPU) in the apparatus may have the above-mentioned structure. It is also within the scope of the present invention to supply the program code of the software for realizing the embodiment, and the computer of the system or the apparatus operates the various devices according to the program code to realize the embodiment. .

Further, in this case, the program code itself of the software realizes the function of the above-mentioned embodiment, and the program code itself and means for supplying the program code to the computer, specifically, the above-mentioned means. A storage medium storing the program code is included in the scope of the present invention.

As a storage medium for storing such a program code, for example, a floppy (registered trademark) disk, a hard disk, an optical disk, a magneto-optical disk, a CD
-ROM, magnetic tape, non-volatile memory card, ROM, etc. can be used.

Further, not only when the functions of the above-described embodiments are realized by the computer controlling various devices only in accordance with the supplied program code, the OS in which the program code runs on the computer. The program code is also included in the scope of the present invention when the above embodiment is realized in cooperation with (operating system) or other application software.

Further, the supplied program code is stored in the memory provided in the function expansion board of the computer or the function expansion unit connected to the computer, and then the function expansion board or the function is instructed based on the instruction of the program code. The case where the CPU or the like included in the storage unit performs some or all of the actual processing and the above-described embodiment is realized by the processing is also included in the scope of the present invention.

[0068]

As described above, according to the present invention,
When displaying a plurality of related images, it is possible to correct the positional deviation of the images in the enlarged display area.

[Brief description of drawings]

FIG. 1 is a diagram showing a functional configuration of an image display device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a structure of image data.

FIG. 3 is a diagram showing a basic configuration of a parameter setting unit 2.

FIG. 4 is a diagram showing a configuration of conversion coefficients generated by a reduced image generation unit 202.

FIG. 5 is a diagram showing a state when an arbitrary point x in a current image is converted into a corresponding point x ′ in anatomy of a past image.

FIG. 6 is a diagram showing a display example when a current image and a past image are displayed on a display unit 6;

FIG. 7 is a diagram showing a display example in which only a region of interest is enlarged and displayed in the current image and the past image, and is overlay-displayed in another region.

FIG. 8A is a diagram showing a configuration of a file containing a code string of one image, and FIG. 8B is a diagram showing a configuration of a file containing code strings of a plurality of images. is there.

9 is a diagram showing a basic configuration of a decoding unit 7. FIG.

FIG. 10 is a diagram illustrating entropy decoding according to the second embodiment of the present invention.

FIG. 11 is a diagram illustrating a case in which a decoding unit is performed only on a part of an image in JPEG2000.

FIG. 12 is a diagram showing a display example when a current image, a past image, and a difference image are simultaneously displayed on the display unit 6.

FIG. 13 is a diagram showing a display example in which a plurality of images are displayed on a display device such as a CRT and only a part of them is enlarged and displayed in an overlapping manner.

FIG. 14 is a diagram showing a functional configuration of an image display device according to a second embodiment of the present invention.

FIG. 15 is a diagram showing a functional configuration of an image display device according to a third embodiment of the present invention.

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Claims (25)

[Claims] 1. An image display device for displaying at least one image among a plurality of mutually related images on a predetermined display means, and an image input means for inputting image data of the plurality of mutually related images. And a coordinate conversion parameter calculation unit that obtains a parameter for performing coordinate conversion of a corresponding portion between the plurality of related images, and an enlarged display of the first image in the plurality of related images. An instructing means for instructing an area to be displayed, an area calculating means for obtaining an enlarged display area in the second image corresponding to the enlarged display area in the first image instructed by the instructing means, using the parameter, An image enlarging means for enlarging an enlarged display area in the first image and the second image and enlarging and displaying the enlarged display area on the display means. Display device. 2. The image display device according to claim 1, wherein the plurality of images associated with each other include an X-ray image, and the X-ray image is a past image and a current image of the same subject. 3. The image display device according to claim 1, wherein the enlarged display area includes an anatomical portion in the image. 4. The image display device according to claim 1, wherein the image input unit inputs the image data as a digital image signal. 5. The coordinate conversion parameter means further includes a reduced image generation means for generating reduced images of at least one image among the plurality of related images, and the first reduced image generation means. Determining a first parameter indicating a rough shift between the first image and the second image by using a first reduced image of the second image and a second reduced image of the second image. 1 parameter calculation means, a search area is set in the first image, the area corresponding to the search area is obtained using the first parameter, and the obtained area is used as the second image. The coordinates of the search area of the first image and the coordinates of the search area of the second image are set using the search area of the first image and the search area of the second image. Find the second parameter to do the conversion The image display device according to claim 1, further comprising: a second parameter calculation unit that uses the second parameter as the coordinate conversion parameter. 6. The reduced image generating means performs a discrete wavelet transform on at least one image among the plurality of images associated with each other to generate an LL subband as a reduced image of the image. The image display device according to claim 5. 7. The first parameter generation means performs a cross-correlation operation between the first reduced image and the second reduced image by the reduced image generation means to obtain the first reduced image.
The image display device according to claim 5 or 6, wherein a first parameter indicating a rough shift between the image and the second image is obtained. 8. The second parameter calculation means sets an area in the second image corresponding to the search area set in the first image at coordinates of the search area set in the first image, The image display device according to claim 5, wherein the image display device is obtained by adding the first parameters. 9. The second parameter calculation means performs a cross-correlation operation between the search area of the first image and the search area of the second image to convert the second parameter into the coordinate conversion. 9. The image display device according to claim 5, wherein the image display device is obtained as a parameter. 10. The image forming means for forming an image so that the resolutions of the first image and the second image can be displayed on the display means.
The image display device according to. 11. The image input means inputs, as image data of the plurality of images associated with each other, a file including a code string hierarchically encoding the image and a header corresponding to the code string, The image display device according to claim 1, further comprising a decoding unit that decodes the code string. 12. The decoding means performs entropy decoding on the code string to restore a quantization index, and dequantization on the quantization index to restore a transform coefficient. The image display device according to claim 11, further comprising: an inverse quantization unit; and an inverse frequency conversion unit that performs an inverse frequency transform on the transform coefficient to restore an image signal. 13. The inverse frequency conversion means adjusts the resolution of the image signal to be restored to a resolution that can be displayed on the display means, and restores the image signal. Image display device. 14. The inverse frequency transform means includes an inverse discrete wavelet transform, and controls the number of levels of the inverse transform to adjust the resolution of the image signal to be restored to a resolution displayable on the display means. The image display device according to claim 13, which is characterized in that. 15. The decoding means decodes an image included in an area designated by the designating means with higher image quality than other areas.
The image display device according to. 16. The coordinate conversion parameter calculation means comprises:
A transform coefficient of the first image by the inverse quantizer,
13. The image display according to claim 12, wherein a parameter for performing coordinate conversion of corresponding portions of the first image and the second image is obtained by using the conversion coefficient of the second image. apparatus. 17. The image according to claim 1, further comprising difference image generation means for generating a difference image between the first image and the second image. Display device. 18. An image display method for displaying at least one image among a plurality of images related to each other on a predetermined display means, the image inputting step of inputting image data of the plurality of images related to each other. And a coordinate transformation parameter calculation step of obtaining a parameter for performing coordinate transformation of a corresponding portion between the plurality of mutually related images, and an enlarged display of the first image in the plurality of mutually related images. An instructing step of instructing an area to be performed, an area calculating step of using the parameter to obtain an enlarged display area in the second image corresponding to the enlarged display area in the first image instructed in the instructing step, A magnifying step of magnifying the magnified display area in the first image and the second image and displaying the magnified display area on the display means. How to Display. 19. The coordinate conversion parameter step further includes a reduced image generation step of generating reduced images of at least one image among the plurality of related images, and the first reduced image generation step. A first reduced image of the first image and a second reduced image of the second image are used to obtain a first parameter indicating a rough shift between the first image and the second image. 1 parameter calculation step, a search area is set in the first image, the area corresponding to the search area is obtained using the first parameter, and the obtained area is used as the second image. The coordinates of the search area of the first image and the coordinates of the search area of the second image are set using the search area of the first image and the search area of the second image. Find the second parameter to convert 19. The image display method according to claim 18, further comprising: a second parameter calculation step for converting the second parameter as the coordinate conversion parameter. 20. An image forming step of forming an image of the resolutions of the first image and the second image to a resolution that can be displayed on the display means.
8. The image display method according to item 8. 21. In the image input step, a file including a code string hierarchically encoding the image and a header corresponding to the code string is input as image data of the plurality of images associated with each other, The image display method according to any one of claims 18 to 20, further comprising a decoding step of decoding the code string. 22. In the decoding step, entropy decoding is performed on the code string to restore a quantization index, and dequantization is performed on the quantization index to restore a transform coefficient. The image display method according to claim 21, further comprising an inverse quantization step and an inverse frequency conversion step of performing an inverse frequency transform on the transform coefficient to restore an image signal. 23. The image according to claim 18, further comprising a difference image generating step of generating a difference image between the first image and the second image. Display method. 24. A program for executing the image display method according to any one of claims 18 to 24. 25. A computer-readable storage medium storing the program according to claim 24.