WO2002065754A1 - Verfahren und vorrichtung zum bearbeiten eines in einem ersten computer gespeicherten digitalisierten bildes, und computerlesbares speichermedium - Google Patents
Verfahren und vorrichtung zum bearbeiten eines in einem ersten computer gespeicherten digitalisierten bildes, und computerlesbares speichermedium Download PDFInfo
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- WO2002065754A1 WO2002065754A1 PCT/DE2002/000329 DE0200329W WO02065754A1 WO 2002065754 A1 WO2002065754 A1 WO 2002065754A1 DE 0200329 W DE0200329 W DE 0200329W WO 02065754 A1 WO02065754 A1 WO 02065754A1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2370/00—Aspects of data communication
- G09G2370/02—Networking aspects
- G09G2370/027—Arrangements and methods specific for the display of internet documents
Definitions
- the invention relates to a method and a device for processing a digitized image with pixels stored in a first computer, a computer-readable storage medium and a computer program element.
- the information transmitted from one computer to another computer via the Internet usually contains both text-based data and graphic data, that is to say image data or multimedia-based Internet applications, for example video data and / or audio data.
- One area of application for data transmission of multimedia data is electronic catalogs, which are made available by a server computer, the operator of which is, for example, a department store, for retrieval by a client computer via the Internet / intranet.
- a communication network is to be understood as any type of communication network via which information can be transmitted, for example a fixed telephone network or a mobile radio network.
- the transmission of the data can be based on any communication protocol, for example on the Internet on the Transport Control Protocol (TCP) and the Internet Protocol (IP).
- TCP Transport Control Protocol
- IP Internet Protocol
- the ever-increasing bandwidth available means that the information made available on the Internet has to meet ever higher quality requirements, that is, its multimedia quality has to be continuously improved in order to remain competitive.
- Coding standards have developed for the coding of digitized images, be they still images or also video images, that is to say a temporal sequence of images, with which it is possible to provide real-time color information associated with the pixels of a respective digitized image.
- GIF GIF format
- encoding information that is to say the information which is associated with the pixels of the digitized image and which characterizes the image.
- coding information is understood to mean, for example, one of the following types of information:
- Another coding standard for the coding of still pictures that is for the coding of a single picture, is the JPEG format.
- the coding according to the JPEG standard is lossy.
- the degree of quality loss can be specified when encoding a digitized image, for example in order to determine, depending on the image content, the measure between the quality of the encoded image information and the thus generated file size of a file in which the digitized image is encoded.
- the JPEG graphics format supports 24-bit color depth, which means that with this coding standard a true color representation of image information is possible.
- Another example of a coding standard for coding a still picture is the coding standard according to the PNG format.
- both the color depth and the quality i.e. the degree of loss of information during compression, can vary.
- a transparency mask can also be saved in accordance with the PNG standard, so that, for example, graphic objects can be displayed freely.
- Cropping a graphic object means that the graphic object can be selected individually, separated from the rest of the image and embedded in one or more other graphic objects, for example in a new image background.
- cropping for example, that the product photo can be separated in such a way that the photo background can be separated from the product and in this way the product photo can be embedded in any other graphic environment.
- An electronic catalog is thus often supplemented or replaced by a so-called electronic department store, in that the articles viewed in the electronic catalog, for example, can be ordered and paid for directly online via the communication network. The purchased products are then delivered directly to the buyer of the product.
- the deviation in the color representation of the electronically represented object and the real object is therefore a major cause of user dissatisfaction and the high response rate.
- [1] discloses a method for color correction, in which it is determined on the basis of standard ICC profiles specified for a data display unit whether a respective data display unit is set up to display colors. If necessary, a color correction is carried out using the standard ICC profiles stored in the data display unit.
- This procedure is disadvantageous in that only a limited and, in addition, a predetermined number of standard ICC profiles are provided, and therefore only an inaccurate color display is possible, particularly in view of special general conditions such as changing lighting conditions.
- [2] describes the so-called cookie mechanism.
- the invention is therefore based on the problem of having digitized images stored in a first computer Edit pixels so that an essentially uniform color representation of the image on a respective data display unit is made possible in the case of computers connected to one another via a communication network.
- the problem is solved by the method and the device for processing a digitized image with pixels which are stored in a first computer and to which first coding information is assigned, by means of a computer-readable storage medium and a computer program element having the features according to the independent patent claims.
- Pixels, to which the first coding information is assigned has a processor which is set up in such a way that the method steps described below can be carried out and carried out during operation.
- data display unit parameters of a data display unit are set by a user of the data display unit and then by the second computer via a telecommunications network transferred to the first computer.
- the data display unit parameters describe the data display unit, in particular its display properties, that is to say its properties with regard to the display of digitized image information.
- the first coding information associated with the digitized image is changed to a second one depending on the data display unit parameters Coding information and digitized image modified in this way is transmitted to the second computer, where it can subsequently be displayed on the data display unit to a user of the second computer.
- the first coding information and the second coding information can have at least one of the following types of information:
- Computer program for processing a digitized image stored in a first computer with pixels to which first coding information is assigned the computer program having the method steps described above, if it is from a
- a computer program element for processing a digitized image stored in a first computer with pixels to which first coding information is assigned has the method steps described above when it is executed by a processor.
- Data display unit of a client computer describes, from the respective client computer, that is to say transmitted to the first computer, an adaptation of the image information to be transmitted to the peculiarities of the respective data display unit of the client computer is changed on the server side and the image information modified in this way is also changed respective client computer is transmitted so that one at the respective data display unit of the respective client computer adapted and optimized image representation, in particular color representation and brightness representation and contrast representation is made possible.
- the further refinements of the invention relate both to the method, the device, the computer-readable storage medium and the computer program element.
- Coding information contained second color information can are in an RGB color space representation, hereinafter referred to as RGB color mode (red, green, blue).
- the invention can be implemented both in hardware, that is to say by means of a special electronic circuit and in software, that is to say by means of a computer program.
- the first coding information has first color information and the second coding information has second color information.
- the first color information is changed to the second color information, the color information being changed in an HLS color model representation, hereinafter referred to as HLS color mode (H: color angle in the color wheel, L: brightness of the color, S: saturation of the color ).
- Characteristics of a data display unit adaptable change in the image information to be displayed, that is to say both the color information and the brightness information and the saturation information.
- the data display unit parameters of the data display unit can be determined or set, that is to say the data display unit parameters can be determined and stored manually or automatically.
- a communication connection to the first computer can be established by the second computer, and after the communication connection has been established, the data display unit parameters can be requested automatically by the first computer. Due to the requirement, the data display unit parameters of are transmitted from the second computer to the first computer via the communication network.
- TM for example, Internet Explorer or Netscape
- a cookie file can be stored, which is immediately after the communication connection has been established.
- the respective first computer that is to say the server computer, with which the data display unit parameters of the respective client computer are made available to the server computer.
- a cookie is a server-side mechanism (usually initiated by CGI scripts) that stores information on a WWW client computer and can be queried again by the WWW server computer.
- CGI scripts For certain Internet applications (search engines, e-business, etc.), personal preferences can be stored locally on the client computer, so that the user does not have to reset the corresponding domain (URL) the next time they are called up.
- the actual cookie consists of the relevant information in the respective cookie file, which is stamped like a passport each time you re-enter a territory.
- a cookie file is clearly a file that is to be found in the second
- Computer is stored and can be called up by means of the respective browser program by means of a corresponding query message on the part of the server computer and what information which can be specified, according to the exemplary embodiment of the invention, the data display unit parameters of the
- Data display unit of each on the second computer connected data display unit contains and is thus transmitted to the server computer.
- a data display unit for a data display unit, a plurality of sets of different data display unit parameters are determined and stored, with each set of data display unit parameters, that is to say each set of data display unit parameters, being associated with description information relating to the respective sets of Describe data display unit parameters.
- the description information can include at least one of the following types of information:
- environmental parameters which describe environmental conditions for which the data display unit parameters of the respective set of data display unit parameters are intended, and / or
- Time information which describes a period of time for which the data display unit parameters of the respective set of data display unit parameters are determined.
- This embodiment of the invention makes it possible to fall on different ambient conditions or for different periods of a day, for example for a period in which daylight in the respective room in which the computer and the data display unit connected to the computer is usually located and operated , or in a period in which only artificial light, that is to say artificially generated light, is to be received and taken into account.
- a flexible adaptation of the image display to different operating conditions is made possible, which leads to a further improvement in the color fastness of an image displayed on a data display unit of a client computer.
- a set of data display unit parameters can be selected depending on the description information, and the selected data display unit parameters can be transmitted to the first computer.
- FIG 1 is a flowchart in which the individual
- FIG. 2 is a block diagram showing a communication system according to an embodiment of the invention.
- Figure 3 is an illustration of an input mask for the
- Figure 4 is an illustration of an input mask for the brightness correction of a data display unit in the
- Figure 5 is an illustration of an input mask for the
- Color correction of a data display unit as part of a calibration at the application level 6 shows a representation of an input mask for the
- FIG. 7 shows a color wheel according to the HLS color model
- FIG. 8 shows a color circle according to the HLS color model with additional information about brightness information
- FIG. 9 shows a flow chart in which the individual method steps for changing the coding information are shown according to an embodiment of the invention.
- Figure 10 is a diagram showing a color correction in the RGB color mode.
- FIG. 2 shows a communication system 200 with a server computer 201 as the first computer and a multiplicity of client computers 202, 203, 204, each as a second computer, each via a public communication network 205, in accordance with this exemplary embodiment a fixed telecommunications network, which can transmit data using the Internet protocol is coupled.
- the public communication network 205 can also be configured as a complete or partial mobile radio network.
- the server computer 201 and the client computer 202, 203, 204 are each coupled to the public communication network 205 via connecting lines 206, 207, 208, 209.
- any number of client computers 202, 203, 204 and any number of server computers 201 can be contained in the communication system 200.
- server computer or client computer is only to be understood functionally, based on an application in each case.
- a client computer that uses a first service, with respect to which it acts as a client can be configured as a server in another application, that is to say in another service, that is to say as the instance, that provides the respective service.
- any number of server computers can be provided in the heterogeneous communication system 200, which can be based on different operating systems and different application programs.
- a network input / output interface 210 via which communication via the Internet, that is to say the public communication network 205, is made possible,
- a further input / output interface 222, 223, 224, 225 The network input / output interface 210, 211, 212, 213 the processor, 214, 215, 216, 217, the memory 218, 219, 220, 221 and the further input / output interface 222, 223, 224, 225 are each coupled to one another via a computer bus 226, 227, 228, 229.
- Each browser 218, 219, 220, 221 stores a browser program, which according to this exemplary embodiment is an Internet Explorer TM or a Netscape Navigator program TM, which is executed by means of the respective processor 214, 215, 216, 217 can.
- a browser program which according to this exemplary embodiment is an Internet Explorer TM or a Netscape Navigator program TM, which is executed by means of the respective processor 214, 215, 216, 217 can.
- an electronic catalog 230 is stored in the memory 218 of the server computer 201 and contains a large number of multimedia information, that is to say in particular
- the Internet browser programs which are stored in the memories 219, 220, 221 of the client computers 202, 203, 204, are set up in such a way that they enable one
- a data display unit 234, 235, 236, is connected to each computer 201, 202, 203, 204 via the respective further input / output interface 222, 223, 224, 225 via a first cable as a first connection 230, 231, 232, 233, 237 connected.
- the data display unit 234, 235, 236, 237 can be provided in each case, for example
- a computer mouse 242, 243, 244, 245 is connected via a second cable as a second connection 238, 239, 240, 241 and a keyboard 250, 251, as a third connection 246, 247, 248, 249, via a respective third cable. 252, 253.
- the respective data display units 234, 235, 236, 237 can thus have very different properties, in particular with regard to their properties when displaying color information, for example with regard to the different display modes of the primary colors red, green and blue, and the display of brightness information or saturation information of the respective colors or also the contrast information.
- Each data display unit 234, 235, 236, 237 is calibrated at the start of the method.
- the calibration can take place at the system level or alternatively at the application level, as will be explained in more detail below.
- the respective data display unit 234, 235, 236, 237 is a customary monitor of a personal computer, which has a cathode ray tube and control electronics for converting the respectively supplied signal into the control of the deflection unit of the cathode ray tube as a picture tube.
- the display of the signal on the monitor screen can be influenced by varying the signal parameters red, green and blue, as well as brightness and contrast, which are entered on the monitor in particular using a rotary control, alternatively using pushbuttons or online, that is to say using an onscreen menu can.
- the data display unit 234, 235, 236, 237 In order to enable a digitized image and its coding information to be reproduced as accurately as possible on a monitor, it makes sense to calibrate the monitor, that is to say the data display unit 234, 235, 236, 237, before using it.
- the data display unit 234, 235, 236, 237 should be switched on at least 30 minutes before the start of the calibration so that the individual
- Components of the data display unit 234, 235, 236, 237 have reached their respective operating temperature.
- the calibration should only be carried out after this time has elapsed.
- the respective color component of red, green and blue, as well as the brightness and the contrast can also be set at the system level.
- the data display unit 234, 235, 236, 237 is calibrated at the system level using the combination of graphics card and monitor as described below.
- color areas of the three primary colors red, green and blue are displayed, the respective inner fields of which consist of a changeable color area.
- the color of the inner fields can be changed by moving sliders.
- 3 shows a screen input mask 300, via which a user enters a
- the input mask 300 shows three color areas 301, 302, 303, one color area each for a basic color (first color area 301 for the basic color red, second color area 302 for the basic color green, third color area 303 for the basic color blue).
- Each color area 301, 302, 303 each has an inner color field 304, 305, 306 and an outer color field 307 completely surrounding the respective inner color field 304, 305, 306,
- the color of a respective inner color field 304, 305, 306 can be varied by clicking on a respective slider 310, 311, 312, a slider 310, 311, 312 being assigned to a color area 301, 302, 303.
- the aim of changing the color in the respective inner color field 304, 305, 306 is to adapt the color in the inner color field 304, 305, 306 as precisely as possible to the color of the outer color field 307, 308, 309. A more detailed explanation of how it works will be given later.
- the color value for the respective basic color set as part of the calibration is recorded and evaluated using the graphics card driver and the associated configuration software.
- Another step in the calibration at system level is the brightness adjustment of the respective
- Monitor that is, the data display unit 234, 235, 236, 237.
- a usual brightness input mask 400 is shown in FIG.
- the input mask 400 which is also called
- Comparison mask has a first field 401, which is usually black, and a second field 402, which is usually dark gray.
- a brightness controller of the monitor (not shown) is changed until the dark gray areas 402 are clearly distinguishable from the black fields 401 for the user.
- Data display unit are individually adapted, are used to correct the screen display and influence the conversion of the digital color value for a pixel within the respective graphics card into the digital signal suitable for the connected monitor, that is to say for the connected data display unit 234, 235, 236, 237.
- the ratio of the three color values (RGB) to one another indicates the direction of the color cast of the respective data display unit 234, 235, 236, 237.
- the ratio of the colors of the values for the color red, green and blue is 1: 1: 1.
- Calibration at the application level means that the calibration of the respective data display unit 234, 235, 236, 237 has only an effect on those digitized images that are displayed within the respective application.
- Data display unit 234, 235, 236, 237 were set essentially in the correct color by the respective users.
- a landscape image will typically include a blue sky and green meadow.
- the data display units 234, 235, 236, 237 will usually differ considerably in their respective display properties relative to one another.
- the input masks 300, 400 shown in FIGS. 3 and 4 are displayed on an Internet page to a user who accesses the Internet page, that is to say dials in, and edited accordingly, that is to say adapted, by a respective user ,
- the values determined during the adaptation by the user to describe the characteristics of the respective data display unit 235, 236, 237 are stored in a cookie file in the respective Internet browser program, which is stored in the memory 219, 220, 221 of the respective client computer
- the respective client computers 202 receive
- the information about the respective individual color setting of the respective data display unit 234, 235, 236, 237 and the graphics card is thus clearly stored in the cookie file on the respective client computer 202, 203, 204, without intervention according to this exemplary embodiment respective system, i.e. the hardware itself, are necessary.
- the cookie file and the data display unit parameters stored therein can therefore be called up at any time from a server computer.
- the respective tiled area 501, 502, 503 of the respective color field 504, 505, 506 is unchangeable in its colors.
- the respective primary color i.e. the respective pure color
- maximum intensity value for first primary color red: 255, value for second primary color green: 255, value for third basic color blue: 255
- black field a black field
- a lower area 513, 514, 515 can be varied by means of a respective slider (not shown). If the checkerboard pattern is viewed through the fields 507, 508, 509 or 510, 511, 512 using a human eye, the black and colored areas 507, 508, 509 and 510, 511, 512 become blurred and result in the for the The resultant visual perception of the respective primary color with an intensity of 50%, that is to say, with a value for the first primary color red of 127, with a value for the second primary color green of 127, and with a value for the third primary color blue from 127.
- the respective lower color field 513, 514, 515 is displayed with the intensity of an intensity value of 127 and changed by means of the respective slide control until both color fields appear to be the same for the viewer.
- the value of the respective color (red, blue or green) represented by the position of the slider is then determined.
- the respective values are at a value of 127.
- An upward deviation i.e. for color values greater than 127, means that a higher intensity of the respective color is necessary in order to see a visual perception of 50% of the respective color.
- a deviation downwards i.e. a value less than 127, means that a lower intensity of the respective basic color is necessary in order to guarantee a visual perception of the respective color of 50%.
- the brightness of the black field 601 is unchangeable Colored areas 602 shown in gray, however, can also be changed by means of a slider (not shown).
- the gray areas 602 are to be changed by the respective user until no difference between the respective black field 601 and the gray color areas 602 can be visually determined.
- the gray value obtained in this way indicates the information from when a brightness level of a color can be distinguished from the subsequent one and thus how bright the respective data display unit 234, 235, 236, 237 is set.
- a computer program is also installed, which, before being transmitted to a client computer 202, 203, 204, initially processes each digitized image with those in the cookie file of the respective client computer 202, 203, 204 saved color values corrected.
- An Internet page for example the electronic catalog 220, which is stored in the memory 218 of the server computer 201 and in which images contained in the electronic catalog are to be displayed in the correct color, is to be programmed in such a way that all in the respective Internet page contained images (hereinafter also referred to as image tags) of a published website by calling the installed conversion program with the respective one Transfer of the file name of the image to be displayed are replaced.
- image tags all in the respective Internet page contained images
- Directories "Scripts" and "pics” can each contain server-computer-specific names of directories.
- FIG. 1 shows in a flowchart 100 the method steps to be carried out when a call is made from a client computer 202, 203, 204 via the respective browser program to the Internet page provided by the server computer 201, symbolized in FIG by a first block 101.
- the Internet side of the server computer 201 checks whether the data display unit 235, 236, 237 has already been appropriately calibrated for the data display unit 235, 236, 237 of the respective client computer 202, 203, 204, that is, whether a cookie File is stored in the respective memory 219, 220, 221, in which the data display unit parameters of the respective data display unit 235, 236, 237 are stored (step 102). If this is not the case, then a color correction is carried out for the respective data display unit 235, 236, 237 in one of the ways described above (step 103).
- the determined data display unit parameters are stored in the cookie file in the memory 219, 220, 221 of the corresponding client computer 202, 203, 204.
- step 105 A further step is then made (step 105), in which a branch is made immediately if the test step 102 shows that a cookie file was already stored in the memory 219, 220, 221.
- step 105 the respective Internet page provided by the server computer 201 is loaded by the respective client computer 202, 203, 204.
- the individual HTML tags of the HTML code by means of which the website is encoded are processed in an iterative process (step 106).
- the next step is to check whether the current HTML tag being edited is an image tag (check step 107).
- the HTML tag is, for example, a text-based tag or also a video tag or an audio tag
- the HTML tag is processed immediately (step 108) and the user of the respective client computer 202 , 203, 204 is displayed (step 109).
- the respective cookie file stored in the client computer 202, 203, 204 becomes from the respective client computer 202, 203, 204 via the public communication network 205 to the server computer 201 transmitted (step 110).
- the individual stored color values are thus transmitted from the respective client computer 202, 203, 204 to the server computer 201 and are thus available in the server computer.
- the color values of the image tag to be transmitted are corrected on the server side, that is to say by the server computer 201 (step 111).
- the corrected, that is to say the processed, digitized image is transmitted from the server computer 201 in a further step (step 112) to the respective client computer 202, 203, 204 and in the subsequent display step (step 109) to the user of the client Computers 202, 203, 204 are displayed.
- step 113 it is checked whether the subsequent HTML tag is an HTML tag “new page” (step 113).
- step 106 in which the next HTML tag of the current Internet page is processed.
- step 105 in which a new Internet page can be loaded.
- RGB color model The color model of the primary colors red, green and blue (RGB color model) is explained in more detail below to simplify the illustration of the invention.
- a color point is represented by means of its red components, green components and blue components, which are shown in a 24-bit color mode can be represented by 8 bits of the corresponding primary color.
- a color is described by the respective color angle in the color circle 700 (see FIG. 7), the brightness of the respective color and the saturation of the respective color.
- the information according to the HLS color model is not used for display, but is used for internal calculation and can be adjusted as required.
- a correction of a color cast which a data display unit 234, 235, 236, 237 has, can be implemented in the HLS color mode 11 in a very simple manner.
- the color angle defines the respective color on the color circle 700.
- the units of measurement are degrees of angle, where an angle of 0 degrees corresponds to the color red, an angle of 60 degrees of the color yellow, an angle of 120 degrees of the color green, an angle of 180 degrees of the color cyan, an angle of 240 degrees of the color Blue and an angle value of 300 degrees of the color magenta.
- the basic colors red, green and blue form an equilateral triangle in the color circle 800 (see FIG. 8)
- the complementary colors yellow, magenta and cyan form an equilateral triangle rotated by 60 degrees
- the respective complementary colors red-cyan, green-magenta and Blue-yellow lie opposite each other on the respective color wheel 800.
- a color cast in one color is to be compensated for, ie corrected, with the corresponding opposite color, that is to say by means of the corresponding complementary color.
- a gray color field has a red cast
- the red cast is corrected using the color cyan so that the color gray can be reproduced.
- the HLS color model shown in the color wheel 800 in FIG. 8 additionally contains the information about the brightness of a color.
- the brightness information begins in the center 801 at 0%, which corresponds to a brightness “black” and ends at a brightness information of 100%, which corresponds to a brightness “white”, on the outer edge 802 of the color circle 800.
- the color cast is corrected via the color angle and the brightness by changing the distance of the respective color point in the color circle 800 from the center 801.
- the coding information is manipulated in a targeted manner by breaking down the coding information into the color component, the saturation and the brightness.
- the colors to be displayed on the data display unit 235, 236, 237 are adjusted on the one hand in their color angle, that is to say the corresponding color cast is removed, on the other hand the brightness of the data display unit 235, 236, 237 is compensated for by manipulating the color brightness.
- a color value is present as a number triplet RGB in the RGB color mode 11, the color values R, G and B in the number triplet RGB lying in an integer range from 0 to 255 and representing the respective proportion of the corresponding basic color.
- the number range of the triple number is normalized according to the following rules:
- Brightness 1 is then calculated according to the following rule: _ (cMax + c in)
- the brightness value 1 lies in a range between 0 and 1.
- the saturation value s is to be determined depending on the brightness value 1 in accordance with the following regulation:
- saturation value s is in the range between 0 and 1.
- the value for a color angle h is determined according to the following regulations and depends on the maximum of the individual components of the standardized RGB color values:
- the color angle value h is converted into an angle degree according to the following rule:
- the digitized image now converted into the HLS color mode is corrected in accordance with the data display unit parameters of the respective client computer 202, 203, 204.
- Data display unit 235, 236, 237 of the corresponding client computer 202, 203, 204 converted back into the RGB color mode.
- the color values H, L and S are available and are initially normalized according to the following rule:
- auxiliary variables vl first auxiliary variable
- v2 second auxiliary variable
- the first auxiliary variable vl results according to the following rule:
- the auxiliary procedure h2RGB clearly shows the conversion of a value from a quadrant of the color circle 800 into Cartesian coordinates.
- the auxiliary procedure h2RGB is called up with the following call:
- the angle value h is increased by the value 1, which means:
- the color angle value h is decreased by the value 1, which means:
- the result value is assigned the value of the first auxiliary variable vl, which means:
- FIG. 9 shows a summary of the individual method steps described above in detail in a flow chart 900.
- step 901 the data display unit parameters, that is to say the respective cookie file, are loaded from the respective client computer 202, 203, 204 by means of the server computer 201.
- step 902 the respective image file is loaded from the memory 218 of the server computer 201 and decoded in the memory 218 of the server computer 201 (step 903).
- the following steps are carried out for each color point, that is to say for each pixel to which the color values for the three primary colors are assigned (symbolized by a loop block 904):
- the respective color values that is to say the RGB values, are read out (step 905) and the RGB values are converted into the HLS color model (step 906).
- the colors are corrected in the HLS color mode
- Step 907 depending on the correction values in the cookie file, that is to say depending on the data display unit parameters.
- the corrected color values in the HLS color model are converted back into the RGB color model in accordance with the rules described above (step 908).
- the processed, that is to say the corrected, digitized image is transmitted to the corresponding client computer 202, 203, 204 (step 910).
- a plurality of different service display unit parameter sets are stored in the respective client computer 202, 203, 204, each of which contains data display unit parameters for different environmental conditions or for different times at which different environmental conditions to rule.
- a time indication assigned to the respective set of data display unit parameters is also included compared to a current time and that set of data display unit parameters is selected that match the current time.
- the color correction takes place in the HLS color space; in other words, the color information is changed in the HLS color mode.
- the color information is changed in the RGB color mode, the YMC color mode or also in the YMCK color mode.
- the HLS color mode was used in the first embodiment. This procedure offers the maximum accuracy that can be achieved when changing the color information. A change in the color information, as described in the further exemplary embodiments, is not exact, but does offer sufficient quality for the visual representation of color-correct images. In this context, it is assumed that the digitized images stored in the first computer are stored in the correct color or in neutral color.
- Embodiments unchanged.
- the setting tools described for calibrating the screens also remain unchanged, although in the further exemplary embodiments it is not necessary to set the brightness, since the brightness of a color is determined by the same overhead on all individual color components.
- RGB color mode all colors and brightnesses are displayed by combining the red, green and blue components of a color, the values of the individual color components between a lowest color component value "0" and a highest color component value "255".
- One byte is provided for each color component, which means that any color can be represented using three bytes.
- the RGB color mode 11 is used for color correction.
- the RGB color model can clearly be understood as a Cartesian coordinate system in which the primary colors red, green and blue are plotted on the mutually orthogonal coordinate axes.
- the coordinate axes are finite, i.e. in the coordinate system origin the value of a respective basic color is "0", at the end points of the coordinate axes "255".
- the RGB color mode11 represents all colors in the range • 0 ⁇ red ⁇ 255,
- CD CD CD CD CD CD ⁇ CQ 0 ⁇ - PP PJ rt p. ⁇ - ⁇ P ) tr JJ CD and PP rt P- ffi P 3 ⁇ - P ) ⁇ - P rt 1— 'co IQ ⁇ tu P 0 s; Cfl H ⁇ ⁇ - HH rt P ⁇
- CD S ⁇ O ⁇ ⁇ - ⁇ - p: rt rt rt ⁇ g; ⁇ J ⁇ P ⁇ - h. 0- CD ⁇ P • r] H tr P ⁇ P P ⁇ - p. ⁇ - ⁇ P ⁇ -i H ⁇ P 0 PJ K
- each value of the triplet of numbers of a pixel is offset against the set values for red, green and blue. If the numerical value resulting from the setting tools is greater than 127, the difference is subtracted from the corresponding color component. If the numerical value resulting from the setting tools is less than or equal to 127, the difference is added to the corresponding color component.
- the image corrected in this way is transmitted to the second computer, with which the user receives a color-correct image.
- the second exemplary embodiment describes the method by way of example for a color range around the value of 127 in each case, that is to say at approximately 50% color intensity. This can no longer be applied to the respective end values 0 and 255, otherwise numerical values less than 0 or greater than 255 can result.
- FIG. 10 shows a diagram 1000, in which the procedure for the calculation set out above is shown as an example for a color.
- the color setting tool determines the value z. Based on the The functions with which the color points of the image are calculated are derived from diagram 1000.
- the corrections are calculated in accordance with the above-mentioned function 1003 and subtracted from the original color value or added to the original color value.
- the YMC color mode 11 is used for color correction.
- the YMC color mode 11 follows from the RGB color model 1 by rotating the colors on the color circle 700 in FIG. 7 by 60 °.
- the procedure for color correction in the YMC color mode according to the third embodiment corresponds in principle to the procedure for color correction in the RGB color mode according to the second embodiment.
- a black component is also stored as an additional component compared to the YMC color mode.
- the YMCK color mode is usually used in professional printing.
- the YMCK color mode can be reduced to the YMC color mode at any time.
- the procedure for color correction in the YMCK color mode according to the fourth embodiment corresponds in principle to the procedure for color correction in the RGB color mode according to the second embodiment.
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- Engineering & Computer Science (AREA)
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- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
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- Image Processing (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02706655A EP1356666A1 (de) | 2001-01-30 | 2002-01-30 | Verfahren und vorrichtung zum bearbeiten eines in einem ersten computer gespeicherten digitalisierten bildes, und computerlesbares speichermedium |
DE10290549T DE10290549D2 (de) | 2001-01-30 | 2002-01-30 | Verfahren und Vorrichtung zum Bearbeiten eines in einem ersten Computer gespeicherten digitalisierten Bildes, und computerlesbares Speichermedium |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2001103971 DE10103971A1 (de) | 2001-01-30 | 2001-01-30 | Verfahren und Vorrichtung zum Bearbeiten eines in einem ersten Computer gespeicherten digitalisierten Bildes, Computerlesbares Speichermedium und Computerprogramm-Element |
DE10103971.9 | 2001-01-30 | ||
DE20109132.1 | 2001-05-31 | ||
DE20109132U DE20109132U1 (de) | 2001-01-30 | 2001-05-31 | Vorrichtung zum Bearbeiten eines in einem ersten Computer gespeicherten digitalisierten Bildes |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002065754A1 true WO2002065754A1 (de) | 2002-08-22 |
Family
ID=26008359
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2002/000329 WO2002065754A1 (de) | 2001-01-30 | 2002-01-30 | Verfahren und vorrichtung zum bearbeiten eines in einem ersten computer gespeicherten digitalisierten bildes, und computerlesbares speichermedium |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1356666A1 (de) |
DE (1) | DE10290549D2 (de) |
WO (1) | WO2002065754A1 (de) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6416658A (en) * | 1987-07-10 | 1989-01-20 | Matsushita Electric Ind Co Ltd | Color conditioning method |
US5499109A (en) * | 1994-02-18 | 1996-03-12 | Microsoft Corporation | System for transferring messages between input and output devices in a communication device |
EP0889636A2 (de) * | 1997-06-30 | 1999-01-07 | Fuji Photo Film Co., Ltd. | System und Verfahren zur Bildübertragung |
US6035339A (en) * | 1997-03-13 | 2000-03-07 | At&T Corporation | Network information delivery system for delivering information based on end user terminal requirements |
EP0987877A1 (de) * | 1998-04-06 | 2000-03-22 | Matsushita Graphic Communication Systems, Inc. | Bildkommunikationsvorrichtung und verfahren |
US6094185A (en) * | 1995-07-05 | 2000-07-25 | Sun Microsystems, Inc. | Apparatus and method for automatically adjusting computer display parameters in response to ambient light and user preferences |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5638117A (en) * | 1994-11-14 | 1997-06-10 | Sonnetech, Ltd. | Interactive method and system for color characterization and calibration of display device |
JP2000050087A (ja) * | 1998-07-24 | 2000-02-18 | Canon Inc | 画像処理装置およびその方法 |
ATE234483T1 (de) * | 1998-11-13 | 2003-03-15 | Lightsurf Technologies Inc | Verfahren zur farbtreuen anzeige von in einem netzwerk übertragenen bildern |
-
2002
- 2002-01-30 EP EP02706655A patent/EP1356666A1/de not_active Withdrawn
- 2002-01-30 DE DE10290549T patent/DE10290549D2/de not_active Expired - Fee Related
- 2002-01-30 WO PCT/DE2002/000329 patent/WO2002065754A1/de not_active Application Discontinuation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6416658A (en) * | 1987-07-10 | 1989-01-20 | Matsushita Electric Ind Co Ltd | Color conditioning method |
US5499109A (en) * | 1994-02-18 | 1996-03-12 | Microsoft Corporation | System for transferring messages between input and output devices in a communication device |
US6094185A (en) * | 1995-07-05 | 2000-07-25 | Sun Microsystems, Inc. | Apparatus and method for automatically adjusting computer display parameters in response to ambient light and user preferences |
US6035339A (en) * | 1997-03-13 | 2000-03-07 | At&T Corporation | Network information delivery system for delivering information based on end user terminal requirements |
EP0889636A2 (de) * | 1997-06-30 | 1999-01-07 | Fuji Photo Film Co., Ltd. | System und Verfahren zur Bildübertragung |
EP0987877A1 (de) * | 1998-04-06 | 2000-03-22 | Matsushita Graphic Communication Systems, Inc. | Bildkommunikationsvorrichtung und verfahren |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 013, no. 193 (M - 822) 9 May 1989 (1989-05-09) * |
See also references of EP1356666A1 * |
Also Published As
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DE10290549D2 (de) | 2004-04-15 |
EP1356666A1 (de) | 2003-10-29 |
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