FI116860B - Process and arrangement for processing a digital image matrix - Google Patents

Process and arrangement for processing a digital image matrix Download PDF

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Publication number
FI116860B
FI116860B FI20002751A FI20002751A FI116860B FI 116860 B FI116860 B FI 116860B FI 20002751 A FI20002751 A FI 20002751A FI 20002751 A FI20002751 A FI 20002751A FI 116860 B FI116860 B FI 116860B
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Prior art keywords
characterized
image matrix
signal processing
conversion
image
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FI20002751A
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Finnish (fi)
Swedish (sv)
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FI20002751A0 (en
FI20002751A (en
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Juuso Fredrik Siren
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Instrumentarium Corp
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    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T5/00Image enhancement or restoration
    • G06T5/20Image enhancement or restoration by the use of local operators

Description

+ - Λ 11

Method and system for processing a digital image matrix

The invention relates to a process for processing a digital image matrix; and ice. In particular, the invention relates to digital X-rays interactively.

Medical imaging methods play a central role in the resolution of patients and increasingly involve a variety of nursing activities. Among imaging techniques, digital X-ray imaging enabled by modern digital electronics has increased rapidly to <10 A significant proportion of traditional X-ray imaging digital X-ray imaging creates new and conventional imaging requirements for imaging methods and systems.

The latest imaging techniques include digital imaging technology for direct cassette imaging in direct digital format. Instead of illustrating 15 films and a reinforcing plate, a reusable plate containing a phosphorus surface to be created (e.g., europium-activated barium fluorohalii) The phosphorus crystals in the image plate absorb quantum and quantum radiation radiation to the upper electron spheres. The latent image used may be, for example, x-ray, α, β, or: ··; ultraviolet radiation, however, the term x-ray is used, although: as well as other radiation of the type mentioned above. After X-ray exposure, the phosphor plate is placed in an image of a picture plate, where the plate is read by wiping dot by dot with, for example, 25 laser beams of 633 nm. Quantities of the laser beam cause f "discharge, whereby excited electrons emit til energy between * and · the ground state may be emitted, for example, by visible light. The Ed (··· phenomenon is called photnstinrnilnid mice for your object 2 resolution, although the reading time is longer. Matrix size \ devices can have, for example, 4096 x 4096 pixels and contrast area es, that is 4096 grayscale).

Figure 1 illustrates a typical prior art X-ray imaging object 5 to be imaged within a delimited and directed primary radiation beam 104 of the image plate 101 and X-ray tube 103. The source generator 105 of the X-ray tube 10 is controlled by the control panel 106. and by means of the illumination parameters, and by means of 10 X-ray tubes, a directional lattice and focus. Descriptions of the features of the subject to be used, such as its absorbency and size, the age of the patient being photographed, and other more detailed types of images may have pre-assembled controls at the control panel; consist of combinations of different parameters. The shooting values can be manually accessed using the control panel keypad.

Figure 2 illustrates a known digital image plate image reading system in web 201 is typically a separate image plate reading unit 202, jour. The image image 101 containing the image is inserted into the image reader of the image disc. The read image is converted to digital 203, after which it can be 20 stored in the legacy system memory 204 or alternatively printed to the team a. Feature 4 ·: Castles can be used to select among others. the anatomical part from which the image was taken s f * · * the type of image plate used. In addition, the menu may also have basic functions for image scaling, such as the intermediate reading system that often affects the image density. generating a histogram for image signal analysis of the image being processed.

* 4 *

The system shown in Figure 2 corresponds substantially to the state of the art

The problem with prior art solutions is generally the lack of a comprehensive] easy-to-use digital X-ray image processing method. In prior art arrangements, image processing was basically integrated with image disk readers, resulting in 15 of the rigid system used. In addition, prior art solutions are typically characterized by automatically generating a histogram of the signal and analyzing the inside of the image based on the generated histogram. However, the problem with obtaining a satisfactory digital image is the uncertainty of the methods based on histogram analysis. The object of the invention is to provide an easy-to-use solution for generating diagnostic X-rays. A further object of the invention is to reverberate in such a way that the dynamics present in the image can be utilized in image forming. It is a further object of the invention to provide significant storage savings for digital images compared to prior art solutions.

The objects of the invention are achieved in that the resulting input or image is interactively processed and that the final result can be stored in a ski. the scaled endpoint typically contains only a certain amount of significant

The digital image matrix of the method according to the invention is characterized in that the method comprises the steps of forming a digital image matrix (303), i · · · · · · · · · · · · ’. - setting at least one signal processing parameter (403b, 404b, - · I i - performing at least one signal processing "* 404c, 405c) on the digital image matrix to obtain at least one set of signal processing pairs * · - '', ./·*. - Immediate result (403d, 404d, 405d) is displayed, 4 - Scaled (411,412) of the result obtained immediately:

The digital image matrix of the rigid system according to the invention is characterized in that the rigid system comprises - means (502) for generating a digital image matrix, - means (602, 5603, 604) for decoding at least one signal processing, - means (505) means (509) for displaying an immediate result, means (602, 603, 604) for setting a new value of at least one processing parameter to be set, if necessary, and for obtaining a new result through at least one of the signal processing parameters set for signal processing; (508) from the interval obtained to scale the final result.

. Some preferred embodiments of the invention are disclosed in the dependent claims.

• «» · «•» »to *

The invention provides considerable advantages over the prior art. The user can manipulate digital image edits such as o, ···. a CRT monitor, a workstation or a similar type of terminal, '* ··, has a method and system of the invention installed. The processing of the digital * matrix can be done interactively, whereby the effect of the image processing operation * 1 to 25 immediately performed on it is to the result of the image. For example, processing an image matrix is a specific anatomical part. Parameter values can be stored in preset or shortcut type menus, so that when processing a subsequent type of image, the preset image processing parameter values can be rendered by selecting the preset settings or menu item. 5 types of pictures. Alternatively, the parameter values used by the user, or the user's own personal preferences or habits, which are preferred to view the image, for example by users with a lighter shade, may initially select their own personal settings for the image matrix. In the method according to the invention, glues may also advantageously be provided such that a specific combination of a particular image type of user mi can be stored in a particular selection, for example, if the user has a different preference for a particular anatomical image than other users.

In addition, the parameter values can be tracked to correspond to some other feature, such as the lighting conditions of a monitor or a particular image-reading device <15 or even of an apartment, which may be advantageous, for example, in a darkroom or similarly specially lit place.

The processing of the digital image matrix can advantageously be performed. mathematically, whereby the method can perform certain preselection values, for example depending on the subject being shot, the user or the monitor: 20 semi-automation can also be completely eliminated by using it. these settings.

• ·! In addition, the invention makes it possible to obtain a substantial or

«M I

· * · .. saving the task when compared to the size of the resulting input or image matrix, which can be scaled from the immediate result to the desired dynam. · -. 25 that will happen. The contraction of the dynamics is most preferably performed in m 11! the most significant bits of the immediate result.

• * Λ · The input or input to the method according to the invention is of type]: ** [: a grayscale image with greater or equal sadness · * “: result, such as 16 bits. The input can be displayed initially k 6 Control parameters value selection controls can typically be slider bars that are displayed on the screen, such as a mouse or other interface. The slider bars can be mimicked edv so that one slider bar corresponds to brightness, one to global contrast and up to 5 contrasts. The brightness control can be used to select the incoming image matrix gain, the global contrast control to digitally amplify the conversion. LUT conversion and contrast enhancement conversion of the input v on the local contrast control. The following section describes preferred embodiments of the invention with reference to the accompanying drawings, in which Figure 1 shows a typical prior art X-ray image 2 illustrates a prior art digital image plate view according to the invention, and associated steps for actively processing digital imagery, Fig. 4 is a flowchart illustrating a method of the invention. format for interactive processing of an image matrix,

• IM

Fig. 5 of an i: 20 shows a rigid system of the invention digital i '\. for interactive processing of sin, * »# * * * '; Fig. 6 illustrates an interface according to the invention for interactive processing of digital # * '· · · * rice, and Fig. 7 illustrates three different types of LUT functions.

··· • · * · * · '25 Figures 1 and 2 have already been explained above The prior art or type of radiation of the prior art description * * 7 is irrelevant, but radiation may be anything or cause an image to be formed in a dedicated slot, e.g. digitally processed image disc.

The x-ray image taken is read from the image plate in step 302 using a dedicated icicle technique. The resulting image can be transferred directly to a workstation, whereby the method and system for interactive use of the image matrix can alternatively be stored, for example, in the image read memory or in a data bank of the data network, where it can be retrieved to the processed template. From the input obtained in step 303, a digital V10 is formed in step 304, and the digital image matrix is subjected to interactive processing by the method and system of the invention. Interactive link processing takes place by adjusting image processing parameters whose v matrix can be seen immediately. The image processing parameter can be continued until the desired result is achieved.

In step 305, it is possible to select whether to print an image matrix resulting from the interactive placement on the film and to select the image on the film printer in step 306. The image can be printed naturally. for print media other than film. In some situations, it is cheaper for an image film than to use a digital image only on a secondary display terminal. The image matrix can be printed on film alternatively. in other steps of the embodiment, such as, for example, those related specifically to the interprocess processing, although not in the flowchart • * *: ·: An embodiment of the interactive signal processing 304: *** steps are shown later in Figure 4. In step 307, the interactive The resulting image matrix may be stored in the memory of the parent station or in a data bank of the data network. Like the recording of an image matrix, it is also performed in other stages of the embodiment, or as shown separately in the flowchart.

Fig. 4 is a flow chart of an embodiment of the method of the invention.

In particular, the dynamics of the grayscale image obtained as input may be as great as that of the final result.

In step 402a, it is possible to select whether to select combinations of image control parameters, such as brightness and global 5-region) and local (site-specific) contrast for image processing using pre-programmed preset settings, i.e. pres settings. If you want to select the preselection settings, you go to the tray; Otherwise, proceed directly to step 403a. In step 402b, parameter values corresponding to a particular anatomical part can be obtained from the appropriate 10, after which in step 402c a new immediate result is formed from the image matrix and shown in step 402d. The user immediately sees from the shape the effect of the preselection selected in step 402b on the image matrix. After the immediate result is formed, a silence is returned to evaluate whether the result is satisfactory. If the result is satisfactory, go to step 403a and if the result is unsatisfactory, proceeding to step 402b, the preselections selected in the new 402b may correspond to, for example, the following anatomical parts such as skull, ears, sinus, cervical, thoracic, , forearm, forearm, forearm, rar finger, hip, hip joint, femur, knee, tibia, ankle, ankle, 1 20 bones, sternum, collarbone, thorax, trachea, urography, kidney, c Pelvimetry. Said preselections may also have parameter values or other system-related: or echo factors corresponding to the user's preferences. Additionally, the selections may include a preselection that combines a type of parameter control, such as, of course, \. A combination of parameters depending on 25 monitor error, image representing a particular anatomical part, or other factors.

• · • ·

In step 403a, you can select whether you want to adjust the brightness of the image matrix · * ·, and proceed to step 403b where the image matrix is set. ···. can be infinitely adjustable, for example, by means of a slider. Other, ···. 30 directly to step 404a. After adjusting the brightness in step 403c i 9, the digital gain of the image matrix A such that the new immediate result B generated in the brightness control) 403c is of the form B = £ jA, mi: seasonal adjustment.

In step 404a, it is possible to select whether to adjust the globe of the image matrix. 5 If the global contrast is to be adjusted, proceed to step 404b to adjust the global contrast of the matrix, for example, by a stepless step. Otherwise, proceed directly to step 405a. After the global operation, in step 404c a new instant is formed from the image matrix, shown in step 403d, whereby the user immediately sees the effect of the glob 10 adjustment on the current image matrix. Formats after conversion return to step 404a to evaluate if

If the result is satisfactory, proceed to step 405a and if the result is not to step 404b again. For example, the global control performed in step 404b can influence the digital conversion of the digitally amplified ku 15. LUT transform such that the globe after adjustment in step 404c generates a new instant result <C = Lut (B, k2 \ where k2 is the global contrast adjustment parameter. Adjustment

allows you to select the desired LU between the LUT functions used

'by sliding interpolation. Thus, the signal can be processed by a function, such as a slider bar. Preferably, there may be three LUT functions that can be generated by a desired LUT (low, high, center may be more eg when processing tomography images. Li: a separate monitor-LUT is used to account for and correct any distortions caused by the monitor. -other • ·· *. 25 preferably adjusts the digital gain performed in step 403 • ♦♦ • ♦ ϊ,., ϊ In step 405a, you can select whether to adjust the position of the image matrix, and if you want to adjust the local contrast, go to step 4 < the contrast can be adjusted, for example, by the stairs! · · · · · · · · · · · · · · · · · · · · »1 * · 10 A to the local contrast contrast enhancement conversion such that the new immediate result D generated in step 405c is of the form D = A Ahe is the local contrast contrast enhancement conversion sphinct. Preferably, the PAU screen enhancement conversion s is performed directly on the unreinforced 5 le.

In step 406, a composite immediate result Tv is formed from the LUT conversion C for the rice and the local contrast ratio D, such that Tv- (1- fcsjC + kjD, where k3 is any number [0.1 appears for example when adjusting the local contrast Alternatively, the instant result Tv may also be generated in the other form steps, although not shown in the flowchart, and the formed result Tv is shown in step 407, after which the combined immediate result Tv formed in step 408 may be satisfactory if the result is satisfied in step 408 and otherwise. returning to step 402a to interactively interact with image matrix 15. From step 408, of course, you can go to the image matrix editing steps, even though it is not shown in the flowchart

In step 409, it is possible to select whether to store the values used in image processing) and, when selecting, to store the values in step 410. The value of the parameters flies as a preselection to correspond, for example, to appropriate adjustment values for a particular anatomical part. Saving the parameters is an advantageous example: if similar images of the same anatomical part are taken in myc,. I created the image processing parameter values suitable for that image type by going directly to the preselection corresponding to that anatomical part. Parameter! ** may also be stored to match the user or their preference.) ·. ·: 25 blacks. Initially, the user may be identified by image processing, such as i ·· «, or a similar identifier, whereby the user-selectable patch values may be pre-activated. In step 410, it is preferable whether the parameter values are to be stored corresponding to the user (described) in the part of the tower from which the image was captured or some other glacial system. 30 orally or a combination thereof.

II

the contraction of namami is realized. The result can be scaled from an example 16-bit image matrix to an 8-bit image matrix, whereby the scaled image matrix achieves 50% space control relative to the space taken up by the initial matrix memory. In step 413, the final result T es 5 The instant and final dynamics shown in steps 402d to 405d, 407 and 413 may be less than or equal to the actual dynamics of the present one. Due to the display used, the dynamics of the result displayed may be reduced. However, the Miika described in the present case is preferably the same as that of the original input Dynair 10 prior to the recording step from the image matrix, thereby reducing the dynamics and saving the recording capacity.

Figure 5 illustrates a system 500 for interactive digital processing according to the invention. The system of the invention comprises means 501 for generating an input 15 resulting from image reading and means 502 for generating a digital image matrix. The input v from the scanner 513 is automatically scanned into the image matrix after scanning, or can be retrieved from various types of archives or sources. system. Said archives and sources may include, for example, 514, mass storage, 515, a data bank 516, and the Internet 517. The means 203 includes means 503 for displaying the input or a digital matrix generated therefrom, for example, on a CRT display 523.

• <$ m · * The system is characterized by the presence of means 504 Digita: '\. means to perform a 50 contrast and an image matrix brightness adjustment, means for performing a 50 contrast and an image matrix global contrast adjustment, · * ". 25 local contrast enhancement transforms, and an interval. ··· to generate a direct result Tv. The generated instant result is one image matrix conversion. .. a means for combining a contrast enhancement conversion for immediate input, means 504, 505 and 506 may be formed, for example, by ΛΛ A.

12 to a mass memory 515, a data bank 516, or the Internet 517 j for printing an image matrix, for example, with a printer 518.

The system of the invention typically also comprises means for: accessing, editing and storing presets for processing digital rice. The presets can be, for example: described settings 519, user custom settings 520, used display e 521, and used LUT function library 522. The image type Mug may include, for example, adjustment values for a particular anatomical part or children or heavy, and user settings for image preferences corresponding to user preferences. Special settings may include, for example, readjustments, printers, or display controls, or other kiosk or adjustment values associated with the device. In addition, the system can hand you combinations of the above values.

Fig. 6 shows a user interface 600 according to the invention for interactive processing of digital rice 15, which interface comprises a lower image matrix representation and sliders 602, 603 and <to perform processing parameter adjustments. In addition, the interface; . for example, shortcut or menu type tools to use image type or lightweight preset settings. In addition, it should be noted that 20 and region 601 may also be located in the user interface at the other interface M 1; can be a different number and in addition to the sliders can also be replaced m • *; , control with tools such as number fields or command line. Li \ ll: be also a mechanical regulator. The slider can be used to select paramel »· \" from a set of values * that can contain, for example, 256 different parameters! The 25 interface may also include means for performing other known image processing, such as image magnification and reduction 5.1: menus for adjusting the height, and means for lengths, areas, and rendering.

Figure 7 illustrates three different types of LUT functions that can be used 13 which take into account, for example, possible monitor effects: The LUT used in the method of the invention can be formed by linear interpolation from different LUT functions.

Naturally, only some of the principles of embodiment 5 of the solution of the present invention can be modified within the scope of the patent, for example with respect to private use areas. Specifically, the various embodiments of the invention are not for the purposes of the present examples or for the processing of X-rays, but for the inventive method and system can also be used to process 10 types of image matrices.

• • 4 mm • 9 • 1 * «« »f« 9 ΨΨ 9 9 · 4 9 4 M • • · 9 9 4 • · ♦ • 1 49 9 9 4 »1 • ♦ · • ·· 4 · 44 4 • 49 4 4 4 4 • 44 44

Claims (14)

1. A method (300) for processing a digital image matrix, the method comprising the stages in which a digital image matrix (303) is formed, - the necessity of performing signal processing is estimated (403a, 41 amended). signal processing parameters, - if necessary, a new value is set for at least one signal processing (403b, 404b, 405b) and at least one signal processing is performed with the value of at least one set signal processing parameter to be scaled into new direct result, and - the final result12 is scaled (4) from the received direct re
Method according to claim 1, characterized in that in digital signal (304) a digital confirmation (403b) of said digital image matrix 10 is performed. A method according to claim 1, characterized in that in signal signal (304) an LUT conversion (404b) is performed. of said digital image matrix conversion is formed by interpolating from at least two LUTs.
4. A method according to claims 2 and 3, characterized in that said canceling (403b) is performed prior to the LUT conversion (404b). Method according to claim 1, characterized in that a local ring conversion (405b) is performed for the image matrix.
Method according to claim 4, characterized in that said improvement conversion is performed for an unconfirmed image matrix. Method according to claim 2, characterized in that said <20 count (403b) corresponds analogously to the speed of the film. The method according to claim 1, characterized in that said dii «* * ··" * is a combination of the signal conversion performed on the digital bi of the contrast enhancement conversion performed on the image matrix. • 9 t • "·; · Method according to claim 2 or 3, characterized in that n
Method according to claim 9, characterized in that said n is stored (409) to correspond to the individual user.
12. A system (500) for processing a digital image matrix, the feature comprising: 5. means (502) for forming a digital image matrix, means (602,603,604) for setting up at least one signal processing means (505) for performing at least a signal processing for the tris by means of at least one signal processing pi achieves a direct result, 10. means (509) for displaying the direct result, - means (602, 603, 604) for setting a new value if necessary. signal processing parameter and to perform a signal processing in the new values for set at least one signal processing pai obtain a new direct result, and 15. means (508) for scaling the final result from received directly
System according to claim 12, characterized in that the system i] (*) (504) for performing a digital confirmation in the signal processing stage: digital image matrix. The system according to claim 12, characterized in that the system in] 20 (505) for performing a LUT conversion in the signal processing stage of speech image matrix, which LUT is formed by interpolating from at least • · * «»
System according to claim 12, characterized in that the system i]; (506) to perform a local contrast enhancement conversion for a car ··· • ♦ • · ^
System according to claim 13 or 14, characterized in that a system (512) for storing said digital confirmation performed on the control values of said signal conversion in preselection settings.
18. System according to claim 13, 14 or 15, characterized in that n confirmation, said LUT conversion and said local contrast path conversion are performed by sliding functions (602, 603, 604). • · • ♦ * · · • ·! ft ft • ft ft ft ft ft ft ft · · · ft ft · ft · • • ft
FI20002751A 2000-12-15 2000-12-15 Process and arrangement for processing a digital image matrix FI116860B (en)

Priority Applications (2)

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FI20002751A FI116860B (en) 2000-12-15 2000-12-15 Process and arrangement for processing a digital image matrix

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FI20002751A FI116860B (en) 2000-12-15 2000-12-15 Process and arrangement for processing a digital image matrix
PCT/FI2001/001104 WO2002054349A1 (en) 2000-12-15 2001-12-17 Method and arrangement for processing a digital image matrix

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US4697594A (en) * 1985-08-21 1987-10-06 North American Philips Corporation Displaying a single parameter image
US5289520A (en) * 1991-11-27 1994-02-22 Lorad Corporation Stereotactic mammography imaging system with prone position examination table and CCD camera
US5715334A (en) * 1994-03-08 1998-02-03 The University Of Connecticut Digital pixel-accurate intensity processing method for image information enhancement
US6157373A (en) * 1997-11-14 2000-12-05 Trex Medical Corporation Method and apparatus for displaying images
AU1714200A (en) * 1998-11-07 2000-05-29 Ryan D. Higman Methods and software for color encoding and decoding grayscale images without pixel saturation

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FI20002751A (en) 2002-06-16
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