CN111263140B - Apparatus, system and method - Google Patents

Apparatus, system and method Download PDF

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CN111263140B
CN111263140B CN201911166060.XA CN201911166060A CN111263140B CN 111263140 B CN111263140 B CN 111263140B CN 201911166060 A CN201911166060 A CN 201911166060A CN 111263140 B CN111263140 B CN 111263140B
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color
image
processing unit
data processing
image data
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CN111263140A (en
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比约恩·伦恩范茨
安德烈亚斯·高
安德烈亚斯·伯迈斯特
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Bao Shina AG
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N17/00—Diagnosis, testing or measuring for television systems or their details
    • H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46—Colour picture communication systems
    • H04N1/56—Processing of colour picture signals
    • H04N1/60—Colour correction or control
    • H04N1/603—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer
    • H04N1/6033—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer using test pattern analysis
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N17/00—Diagnosis, testing or measuring for television systems or their details
    • H04N17/02—Diagnosis, testing or measuring for television systems or their details for colour television signals

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • General Health & Medical Sciences (AREA)
  • Image Processing (AREA)

Abstract

The present invention relates to an apparatus, system and method. The apparatus is configured to generate target image data and verification image data. The apparatus first forms measurement image data representing a first image of a reference color wheel having patches based on a received image signal. Target image data, which represents a second image that is color-filtered with respect to the first image, is determined from the measurement image data by means of a data processing unit of the device. The second image also shows a color wheel with color blocks. The verification image data, which can be generated by the data processing unit, represents a third image having a frame arrangement, the frame being divided into three sections, respectively. Each first section of each frame has a respective block color of the color blocks shown in the first image. The second section of each frame has a respective block color of the second image. Each third section of each frame has a reference color. The device can be checked and/or the color filtered simply and quickly by means of the verification image data or the third image.

Description

Apparatus, system and method
Technical Field
The invention relates to a device, a system and a method.
Background
Devices are known from the prior art which have a signal input interface for receiving image signals in order to receive image signals or measurement image data represented by image signals. Such devices therefore usually have a data processing unit with a processor unit. The data processing unit can be connected to the signal input interface via an internal signal line. The measurement image data can be extracted from the image signals and processed by means of a data processing unit, in particular by means of an associated processor unit.
In the processing of the measurement image data, a data filter, which can also be referred to simply as a filter, is generally used. The data processing unit, in particular the associated processor unit, can be designed for this purpose. The measurement image data can be changed by means of the filter used, so that for example the brightness of the image represented by the measurement image data is changed. If the image is previously too dark, for example, the filtering can cause the image to brighten. The corresponding process can be performed in reverse. However, the filtering may not only relate to brightness. It is therefore also possible to use color filters which act differently on the different colors of the image. Also, additional and/or alternative filters are possible.
The aforementioned filters are typically filters that can be adjusted by parameters. By selecting the parameters, it can be determined, for example: to what extent a particular color should be attenuated and/or enhanced, or whether the overall brightness should be reduced and/or increased, for example. Thus, depending on the selected parameters for the filter, very different results can be produced after filtering when the measurement image data is filtered. In practice, it is common to find parameters for the filter that represent each color of the image that fits as realistically as possible to the object displayed by the image. If the selection of filter parameters is concerned, in practice the following requirements often exist: the corresponding parameterized filter is tested from preset images with multiple colors. In principle, this is possible. It is thus possible, for example, to take images with a plurality of colors by means of a camera and to transmit image signals representing the images to a data processing unit of the device via a signal input interface of the device. If the filter is now applied to the measured image data represented by the image signal, further image data can be formed therefrom and a corresponding output image signal can be formed, which can be played back on a monitor for display. However, now only: what the resulting image is after filtering. However, from the image displayed on the monitor, it is not possible to recognize: whether the displayed image is indeed better than the image represented by the image signal sent by the camera to the device. Furthermore, based on the image displayed on the monitor, it is impossible to evaluate: whether the displayed image actually realistically shows the color of the photographed object or also deviates greatly from the color of the actual object.
Disclosure of Invention
The invention is therefore based on the object of: an apparatus, a system and/or a method are provided which are capable of processing measurement image data to generate verification image data which in turn represents an image from which a qualitative conclusion regarding the quality of the processing of the image data should be made.
According to a first aspect, the object set forth before is achieved by a device having the features of claim 1. Accordingly, an apparatus is proposed, which has: a signal input interface for receiving a first image signal; and a data processing unit having a processor unit. The data processing unit is configured to generate measurement image data based on the first image signal, the measurement image data representing a first image having a reference color wheel with a first arrangement of first color patches. The data processing unit stores a baseline display having a preset baseline arrangement of block frames. Further, the data processing unit is configured to identify first color patches in the first image based on the reference display and measurement image data, thereby associating each patch frame with one of the first color patches. Furthermore, the data processing unit has a signal processing unit with a color filter. The data processing unit is configured to generate target image data by means of the color filter at least indirectly on the basis of the measurement image data such that the target image data represents a second image having a color wheel with a second arrangement of second color patches identical to the first arrangement, thereby associating each patch frame with one of the second color patches. The data processing unit is configured to determine for each first color block an associated first color value, which represents the color of the respective first color block represented by means of the measured image data. The data processing unit is configured to determine, for each second color block, a second color value which represents the color of the respective second color block which is represented by means of the target image data. A dedicated reference color value representing the associated reference color is stored for each block frame by the data processing unit. Each block frame has at least a first face section, a second face section, and a third face section. The data processing unit is configured to associate the first face segment of each tile frame with a color value of the respectively associated first color tile. The data processing unit is configured to associate the second face segment of each tile frame with a color value of the respectively associated second color tile. The data processing unit is configured to associate the third facet segment of each block frame with the attributed reference color value. Furthermore, the data processing unit is configured to generate the verification image data on the basis of the reference display of the block frame and the color values associated with the face sections, such that the verification image data represents a third image having the block frame in a reference arrangement, wherein each face section has a color determined by the respectively associated color value.
The device offers the advantage that it is possible to generate verification image data representing a third image having a reference arrangement of block frames, wherein each face section of a block frame has a color determined by a respectively associated color value. The area enclosed by the respective block frame also belongs to each block frame. Each face section of a block frame can form a portion of the area enclosed by the respective block frame. Each block frame has first, second and third face sections. The first surface segment has color values which correspond to the color values of the respective color patches of the first image. In other words, the color of the first face section of the block frame can be the color of the respective color block of the first image. Here, it is preferably assumed that: each first color patch of the reference color wheel has a respective uniform and/or exactly one associated color. Thus, a color wheel can have, for example, green, red, blue color patches and also further color patches each constructed in a dedicated color. The corresponding color wheel is displayed by the first image. The first image is represented here by a first image signal, which can be received by means of a signal input interface of the device. The color of the first surface section of the block frame of the third image represented by the producible verification image data can thus correspond to the associated color of the first color block of the first image. Therefore, in brief, the first face section of the patch of the third image can represent the color initial value based on the first image. The target image data represents the second image if a color filter is used for measuring the image data by means of the data processing unit to generate the target image data. However, the color filter used alters the first image represented by the measurement image data with a reference color wheel that is not displayed in a structure, so that the second image also represents a color wheel. However, the color of the second patch of the second image can be changed relative to the color of the first patch of the first image by color filtering. In order to also make the respective color of the second color block of the second image recognizable in the third image, each block frame of the third image has a second surface section, wherein the color value of the second surface section of each block frame corresponds to the second color value of the second color block of the second image. In other words, the color of the second face segment of each block frame of the third image can correspond to the color of the respective second color block of the second image.
It follows that the first facial section of each block frame of the third image has the same color as the corresponding first color patch of the first image, and the second facial section of each block frame has the same color as the corresponding second color patch of the second image. Thus, a comparison of the first and second face sections of the same frame of the third image provides the following feasibility: the change from the color of the first face segment to the color of the second face segment is evaluated optically. Neither the color of the first face section nor the color of the second face section of the same frame provides the possibility of drawing the following conclusions: whether one of the two colors correctly reflects the actual color of the captured color wheel displayed by the first image.
The first image represents and/or displays the reference color wheel. The color values of the color patches of the reference color wheel that are physically used as objects are usually preset and/or known. Further, the blocks are arranged to have a reference arrangement represented by a reference display of the block frame. It is therefore advantageous: the block frames are each associated with a reference color corresponding to the actual color of the reference color wheel that is physically used as the object. In contrast, in practice, the patch color usually displayed by the reference color wheel displayed by the first image is not exactly the color that the color patch of the reference color wheel actually used as the object actually has.
Thus, for the third image it is proposed that each block frame also has a third face section. Here, the color value of the third surface segment of each color patch corresponds to the color value of a reference color associated as a reference color value with the corresponding patch frame of the reference display. It follows that the third face section of each block frame of the third image has the same color as the corresponding color block of the reference color wheel that is physically used as the object. The color of the third face section of the block frame of the third image can thus display the color or color value that the first face section and/or the second face section should optimally have. Here, in brief, the first surface segment displays the photographed color. Briefly, the second panel segment displays the color formed after filtration. Thus, the first and third face segments of the block frame of the third image may be compared to determine: how far the color value at the time of the original shot deviates from the optimum color value. Here, the comparison between the second and third surface sections of the same frame of the third image can be evaluated as follows: how far the color of the second surface segment after filtering deviates from the optimal color value. The third image has a plurality of block frames, wherein each block frame can be associated with a color spectrum and/or color to be verified by selecting a reference color wheel. Preferably, the third image is not inspected and/or displayed with the device. More precisely, it is preferably proposed: the device can be used to generate verification image data representing the third image, so that the verification image data is provided for further processing and/or for display, in particular by means of a monitor. Thus, verifying the image data provides a basis for enabling simple evaluation of the image data processing.
The apparatus has a signal input interface for receiving a first image signal. The signal input interface can be connected to a camera via a signal line, the camera taking a physical reference color wheel as an object. The reference color wheel can have a plurality of color patches arranged in a first arrangement. Thus, the color patches can be arranged, for example, in a matrix arrangement such that a plurality of color patches are arranged side by side with each other in each row and a plurality of color patches are arranged one above the other in each column. Thus, a matrix arrangement can have, for example, six color blocks per row and four color blocks per column. The patches can be arranged spaced apart from each other. The color and/or color value of each color patch of the reference color wheel can be preset unitarily. Furthermore, it is particularly preferably provided that the color values and/or colors of each color block differ from the color values and/or colors of the remaining color blocks. Thus, each color patch of the reference color wheel can have a dedicated color value and/or a dedicated color. If such a reference color wheel is optically acquired as an object by the camera, a first image signal can be provided by the camera, which represents the reference color wheel, which in turn has a first arrangement of first color patches. The image signal can be transmitted to a signal input interface of the device via a signal connection of the wired connection and/or via a radio signal connection. The signal input interface of the device can be configured for this purpose.
The device also has a data processing unit with a processor unit. Furthermore, the data processing unit can have further units, for example a memory unit for storing data. The measurement image data can be generated from the first image signal by means of a data processing unit. Although the generation of the measurement image data is based on the first image signal, the data processing unit can also be configured for carrying out further intermediate steps (for example, brightness adaptation) and/or for carrying out further data processing steps in order to generate the measurement image data on the basis of the first image signal. However, it is also possible to extract the measurement image data directly from the first image signal. This can be an advantageous embodiment for generating the measurement image data.
Already, due to the camera, the associated lens, the conversion of the light into the first image signal and/or the transmission of the first image signal to the signal input interface of the device, a distortion of the first image of the reference color wheel with respect to the actual reference color wheel captured by the camera can be caused. Therefore, the reference color wheel on which the first image is usually displayed can be changed in luminance and/or color from the reference color wheel actually used as the subject.
In order to recover the aforementioned changes as completely and/or advantageously as possible, the data processing unit is designed to generate target image data on the basis of the measurement image data by means of a color filter. The target image data can be changed, for example, by means of a color filter, such that the second image represented by the target image data is brighter than the first image, and/or at least one specific color share of the second image (for example, the color share of green) is increased and/or decreased relative to the green share of the first image by means of the color filter. For the other color portions of the second image, a corresponding change can be applied with respect to the corresponding color portions of the first image due to the use of the color filter. The color filter can be adjusted by parameters preset and/or adjustable by the data processing unit. Preferably, the color filter is a color data filter executable and/or applied by the data processing unit. Since the color filter is preferably designed to generate the target image data by applying the color filter to the measurement image data such that the second image changes the brightness and/or color fraction relative to the first image, the target image data represents a color wheel in which the overall brightness and/or the brightness of a particular color fraction of the color wheel is increased and/or decreased relative to the overall brightness and/or the corresponding color fraction of the first image. Thus, the color wheel displayed by the second image has a second arrangement of second color patches, wherein the second arrangement corresponds to the first arrangement. Thus, the second color patch is displayed in an arrangement corresponding to the first color patch in the second image. Of course, the second color patches each have a second color value that changes with respect to the corresponding color value of the first color patch of the first image. This is a result of the application of the color filter.
The purpose of applying the color filter is generally that the second image deviates less from the reference color wheel used as object actually captured by the camera than the reference color wheel displayed by the first image.
However, in practice it has been found that the respective observations of the reference color wheel represented by the first image and the color wheel represented by the second image do not provide conclusions as to the following: whether the reference color wheel actually taken by the camera is displayed consistently by one of the two images, or what brightness and/or color deviations are present. In principle, however, it is possible that the color or color value of the color block of the reference color wheel actually acquired by the camera is known. Therefore, this information is also taken into account by the device. For this purpose, a reference display is stored by the data processing unit, which has a preset reference arrangement of color patches. The reference arrangement of the block frame here corresponds at least substantially to the first or second arrangement of the first or second color block. The corresponding arrangement preferably relates to the arrangement itself and preferably not to the dimensions of the two-dimensional space. It is also proposed that a dedicated reference color value representing the associated reference color is stored by the data processing unit for each block frame of the reference display. Here, the reference color value specific to the patch frame can correspond to the color value specific to the patch of the reference color wheel actually photographed by the camera. This provides the advantage that the data processing unit knows the actual color values of the color patches of the reference color wheel captured by the camera by means of the dedicated reference color values of the patch frame. The data processing unit is preferably also configured to determine color values of the first and/or second color patches.
Furthermore, each block frame and/or the area enclosed by each block frame is divided into at least three surface sections, preferably exactly three surface sections. However, it is also possible to divide each block frame and/or the associated surface area into more than three surface sections, for example four, five or six surface sections. However, the starting point is firstly to divide each block frame and/or the associated surface area into exactly three surface portions, namely a first surface portion, a second surface portion and a third surface portion. As described above, the data processing unit is further configured to generate verification image data representing a third image having a block frame. In this case, each area section of each block frame has a color determined by the respectively associated color value. Each surface section is preferably completely or at least substantially completely filled with the respective color. Thus, for example, a block frame can have three surface sections with different green colors for the associated surface sections. It is thus possible, for example, for the third surface section to be filled with a green color, wherein the first surface section of the same frame has a lighter green color relative to the third surface section and the second surface section has a darker green color relative to the third surface section. Each of the mentioned surface sections is preferably completely or at least completely filled with the respective green color. It can then be deduced from the foregoing example that the green contribution of the first image leads to target image data by applying a color filter to the measurement image data, the target image data representing the second image, wherein the foregoing green contribution has changed to a slightly darker green. Furthermore, it can be deduced from the preceding example of three different green face segments with the same block frame that neither the green of the first face segment nor the green of the second face segment shows the actual green of the third face segment or neither corresponds to the actual green of the respective color block of the reference color wheel captured by the camera. Thus, three different green surface sections of the same block frame offer the following possibilities: in particular, it is easy and quick to evaluate whether a second surface section has a smaller color deviation than the associated third surface section of the same frame. If the color deviation is smaller, an improvement is achieved by the color filter.
It has proven to be advantageous if the first and second arrangement each correspond to a block pattern of a predetermined grid of color blocks, in particular a matrix pattern of a predetermined grid of color blocks. The corresponding pattern can thus represent, for example, a first number of N blocks alongside one another and another number of M blocks stacked one on top of the other. Here, N and M can be integer values between 2 and 20, for example. Furthermore, it has proven to be advantageous if the reference arrangement is a pattern arrangement of the block frame. Here, the pattern arrangement can correspond in a similar manner to the pattern arrangement of the first or second arrangement. Thus, the reference arrangement can be, for example, a pattern arrangement having a number N of block frames arranged alongside one another and a number M of block frames placed one on top of the other.
It has proven advantageous if the signal processing unit of the data processing unit is designed as a logic unit, which can be formed, for example, by a processor unit in conjunction with a data processing program. It is thereby particularly simple to be able to adjust the color filter of the signal processing unit by means of the parameters. In principle, however, it is also possible for the signal processing unit of the data processing unit to be a physically constructed unit. The color filter can be formed by the signal processing unit and/or constructed as a logical unit or as a physical unit.
It has proven to be particularly advantageous if the first color blocks, the second color blocks and the block frames each have the same basic shape and/or the same basic area. In this way, it is possible to associate the first color patches with the respective patch frames or to associate the second color patches with the respective patch frames in a particularly simple manner. This is also simplified in particular by the first arrangement corresponding to the second arrangement and preferably by the first or second arrangement corresponding at least in basic shape to the reference arrangement. The term "associated" is preferably to be understood as a logical association or a logical combination. Thus, if for example a dedicated reference color is associated with the block frame, this does not mean that the color of the block frame is equal to the dedicated reference color and/or that the area enclosed by the block frame must have a dedicated color.
In practice, it has proven advantageous to refer to the third image as the verification image. This is because the third image represented by the verification image data or the verification image can be used particularly simply for checking the application of the color filter as long as the third image is displayed on the monitor.
Furthermore, it has proven advantageous to understand the signals as data signals. The signal processing unit of the data processing unit can therefore be designed to process the data signal, in particular by means of a color filter.
An advantageous embodiment of the device is characterized in that the total surface area of each block frame is divided into the associated surface sections. This offers the advantage that the total area of each block frame is formed entirely by the associated face section. The total area of the block frames is preferably the area which is spanned and/or enclosed by the respective block frame. Thus, each block frame can be configured such that there is no "free" area other than the face section. The verification image data which can be generated by the data processing unit represent a third image with a block frame, wherein the surface segments each have an associated color, which is determined by the respective associated color value. The data processing unit can thus generate the verification image data such that the third image represents a frame of the piece in which the associated surface section is "dyed" in the aforementioned color. Between two adjacent surface sections of the same frame, a transition or section edge can be produced between the associated colors of the two surface sections. The contrast between the respective colors of the two surface portions can be particularly well visible and/or optically recognizable at the portion edges or at the transitions. If each block frame has three surface sections, three section edges or three transitions can thus also be produced. At the respective section edge or transition, the filtering effect and/or the filtering quality of the measurement image data can be evaluated particularly simply optically to generate the target image data. This applies in particular to the transmission of the verification image data by means of a signal to a display device, wherein the display device is designed to display a third image or verification image represented by the verification image data on the basis of the transmitted signal or verification image data.
An advantageous embodiment of the device is characterized in that the first surface sections each have the same shape and/or size. Furthermore, it has proven to be advantageous if the second surface sections each have the same shape and/or size. Furthermore, it has proven to be advantageous if the third surface sections each have the same shape and/or size. By applying the same shape and/or size to the previously respectively proposed sets of face sections, the block frames can respectively have a repetitive structure, which is advantageous for the optical evaluation and/or analysis of the third image. This applies in particular when the verification image data which can be generated by the data processing unit are used to generate the aforementioned third image on the display screen.
A further advantageous embodiment of the device is characterized in that the block frames each have the same shape and/or size. It can therefore be provided that the block frames each have the same, at least substantially rectangular shape. Furthermore, it is preferably provided that the first, second or third surface section of each block frame is in each case triangular in shape, and that the two further surface sections of the respective block frame have a mirror-symmetrical shape. Thus, the respective other two face sections of the respective block frame can have a wedge shape. By means of the aforementioned embodiment of the surface section shape, the transition between the surface sections or the section edges can be rectilinear, which allows particularly simple and/or optically precise evaluation of color deviations of the same hue between the surface sections of the same frame.
A further advantageous embodiment of the device is characterized in that the first image signal represents an acquired original image, wherein the data processing unit is configured to generate the measurement image data on the basis of the first image signal such that the first image is an original image that changes in average brightness. The original image represented by the first image signal via the signal input interface can therefore be initially adjusted by signal processing of the first image signal, so that the first image formed in this way is adjusted in terms of brightness, in particular the associated brightness is increased or decreased. The adjustment of the brightness can be performed, for example, on the basis of the so-called "80% gray field (Graufeld)". The gray field can be represented by one of the color blocks mapped out of the original image by means of the first image signal. The corresponding color blocks can also be referred to as gray field blocks. In the case of deviations from the preset brightness of the gray field blocks, the data processing unit can be configured to adjust the overall brightness of the original image represented by the first image signal such that the brightness of the gray field blocks displayed by the original image corresponds to the preset brightness. The resulting measurement image data can thus represent the first image with the reference color wheel.
A further advantageous embodiment of the device is characterized in that the signal processing unit is designed to generate the target image data by color-dependent filtering of the measurement image data by means of a color filter. Thus, the color filter can be configured for color-dependent filtering. The correlation of the filtering with a particular color and/or hue can be determined by parameters which are in turn presettable and/or adjustable.
An advantageous embodiment of the device is characterized in that the color filter is designed as a data filter which can be adjusted by means of parameters. Such a data filter can be designed to filter data, in particular image data, according to the RGB colors respectively represented. The filtering is here associated with adjustable parameters. The adjustment can be preset here. The type of filtration, the respective attenuation, the respective limit value of the color spectrum and/or other color-related properties can be influenced by and/or determined by the parameters. The filter characteristics of the color filter for each RGB color can be determined by means of the parameters.
A further advantageous embodiment of the device is characterized in that the data processing unit is configured to determine the parameters for adjusting the color filter such that the sum of errors resulting from the numerical differences between the second color values and the reference color values associated with the respective same frame is smaller than a predetermined error threshold value or is minimal. Therefore, for each block frame, the difference between the second color value associated with the second face segment and the reference color value associated with the third face segment of the same block frame can be found. The difference can be made for all block frames of the third image. The sum of the values of the aforementioned differences then forms the sum of errors constituted by the differences in values between the second colour values associated with the respective same frame and the reference value. Furthermore, the data processing unit is configured to determine parameters for adjusting the color filter such that the sum of errors is smaller than a predetermined error threshold value or is minimal. For example, the parameters can be adjusted such that the sum of the errors is particularly small. This is because, in this case, the color of the second face section of the block frame is very similar to the color of the corresponding third face section associated with the block frame. In this case, the third surface sections of the block frame each describe the color which the color blocks of the reference color wheel actually acquired by means of the camera have. It has proven advantageous if the data processing unit is designed to solve a so-called "least squares" problem or a problem which follows the sum of the least squares errors. This can be used by the data processing unit to determine the parameters for adjusting the color filter such that the error sum is smaller than a predetermined error threshold value or is minimal.
A further advantageous embodiment of the device is characterized in that the device has an output interface for providing an output signal, wherein the data processing unit is designed to generate the output signal on the basis of the verification image data in such a way that the output signal represents the third image and/or the verification image data. Thus, by means of the output interface an output signal can be provided, which can be used for further processing. The output signal can be transmitted, for example, to a display unit, in particular a monitor. The display unit can be configured to display a third image based on the output signal. The third image can then be optically analyzed and/or examined in order to make an optical evaluation of the imaging quality of the second image and/or the quality of the filtered signal processing, particularly simply with respect to the reference color wheel actually acquired by means of the camera.
According to a second aspect of the invention, the object set forth in the foregoing is achieved by a system having the features of claim 10. Accordingly, a system is proposed, having: an image camera for acquiring an original image; the device according to the first aspect of the invention and/or one of the advantageous embodiments described above; and optical display devices. The image camera is configured to generate a first image signal representing the captured raw image. Furthermore, the image camera is connected via a first signal connection to a signal input interface of the device in order to transmit a first image signal to the device. The display device is connected to the device, in particular to the associated output interface, via a second signal connection in order to transmit an output signal from the device to the display device, the output signal representing the verification image data and/or the third image. The display device is designed to optically display the third image on the basis of the verification image data and/or the output signal. Each of the aforementioned signal connections can be configured as wired signal connections, as radio signal connections and/or as a combination of both of the aforementioned connection types. Preferably, the first signal connection is configured as a network connection. Thus, the device can be connected to, for example, a network camera as the aforementioned image camera. In this case, the original image captured by the image camera, in particular by the image camera designed as a web camera, displays a reference color wheel which is physically arranged in the optical capture area of the image camera. The reference color wheel has a plurality of color patches arranged in a first arrangement.
For the system according to the second aspect, advantageous elaborations, preferred features, effects and/or advantages are at least in a similar way preferably referred to what is described in connection with the device according to the first aspect and/or one of the advantageous designs pertaining. This applies in particular to the devices of the system. And thus the description will not be repeated.
An advantageous embodiment of the system is characterized in that the display device is designed as a mobile display device. The second signal connection can thus be, for example, a radio signal connection. The mobile display device can be formed, for example, by a so-called tablet computer or by a mobile telephone. The third image can thus be displayed by a mobile display device, in particular a tablet computer or a mobile phone. The system user therefore does not have to be in the vicinity of the device. More precisely, the user can be in the vicinity of an image camera, which is coupled to the device by means of a first signal connection, in order to change the light level and/or to take other measures to obtain an improved first image and/or second image.
According to a third aspect of the invention, the object stated in the foregoing is achieved by a method having the features of claim 12. Therefore, a method is proposed, which has at least the following steps a) to j):
a) receiving a first image signal via a signal input interface of the device, the device having a data processing unit with a processor unit, wherein the data processing unit stores a reference display having a preset reference arrangement of block frames, and wherein the data processing unit has a signal processing unit with a color filter;
b) generating, by means of a data processing unit, measurement image data based on the first image signal, wherein the measurement image data represents a first image having a reference color wheel with a first arrangement of first color patches;
c) identifying, by means of the data processing unit, first color patches in the first image based on the reference display and measurement image data, such that each patch frame is associated with one of the first color patches;
d) generating target image data by means of a color filter of the signal processing unit at least indirectly on the basis of the measurement image data such that the target image data represents a second image having a color wheel with a second arrangement of second color patches identical to the first arrangement such that each patch frame is associated with one of the second color patches;
e) determining a first color value for each first color block by means of the data processing unit, wherein each first color value represents the color of the respective first color block represented by means of the measurement image data;
f) determining a second color value for each second color block, wherein each second color value represents the color of the respective second color block represented by means of the target image data;
wherein a dedicated reference color value representing the associated reference color is stored for each block frame by the data processing unit, an
Wherein each block frame has at least a first face section, a second face section, and a third face section;
g) associating, by means of the data processing unit, the first surface section of each block frame with the color values of the respectively associated first color patches;
h) associating, by means of the data processing unit, the second surface section of each block frame with the color value of the respectively associated second color block;
i) associating, by means of the data processing unit, the third surface section of each block frame with the associated reference color value; and
j) on the basis of the reference representation of the block frame and the color values associated with the surface sections, the verification image data is generated by means of the data processing unit such that the verification image data represents a third image having the block frame in a reference arrangement, wherein each surface section has a color determined by the respectively associated color value.
Each step of the method, in particular each step a) to j), can have an associated substep. Preferably, these steps are performed in the aforementioned order a) to j). However, other steps can also be performed between the individual steps.
The steps of the method according to the third aspect of the invention correspond to the respective configurations of the data processing unit of the device according to the first and/or second aspect of the invention. For methods and in particular for the steps to which it pertains, therefore, reference is made at least in a similar manner to what has been described in connection with the device according to the first and/or second aspect of the invention, and in particular in connection with the configuration of the data processing unit of the device, to the advantageous elaborations, preferred features, effects and/or advantages. And thus similar repetition is omitted.
In addition, advantageous embodiments of the method are described. The method features of each advantageous embodiment of the method correspond to the respective configuration of the data processing unit and/or to further features of the advantageous embodiment of the device or system. For each advantageous configuration of the method and in particular of the associated method steps, advantageous statements, preferred features, effects and/or advantages are therefore made at least in a similar manner with reference to what has been described in connection with the respective advantageous configuration of the device and/or the system. Therefore, similar repetition is also omitted here.
An advantageous embodiment of the method is characterized in that the total surface area of each block frame is divided into associated surface sections.
An advantageous embodiment of the method is characterized in that the first surface sections each have the same shape and/or size, the second surface sections each have the same shape and/or size, and/or the third surface sections each have the same shape and/or size.
An advantageous embodiment of the method is characterized in that the block frames each have the same, at least substantially rectangular shape, wherein the first, second or third surface section of each block frame is in each case triangular in shape, and the two further surface sections of the respective block frame have a mirror-symmetrical shape.
An advantageous embodiment of the method is characterized in that the first image signal represents the acquired original image, wherein in step b) the generation of the first measurement image data is carried out by means of the data processing unit on the basis of the first image signal, such that the first image is an original image that changes in average brightness.
An advantageous embodiment of the method is characterized in that the target image data are generated by means of the signal processing unit by means of a color-dependent filtering of the measurement image data by means of a color filter.
An advantageous embodiment of the method is characterized in that the color filter is designed as a data filter which can be adjusted by means of parameters, wherein in step d) the parameters for adjusting the signal filter are determined by means of the data processing unit in such a way that the sum of the errors of the numerical differences between the second color values and the reference color values associated with the respective same frame is smaller than a predetermined error threshold value or is minimal.
An advantageous embodiment of the method is characterized in that the method has a further step k): the third image is optically displayed by means of a display unit. Step k) is preferably performed after step j).
Drawings
Further features, advantages and application possibilities of the invention emerge from the following description of an embodiment and the accompanying drawings. All described and/or illustrated features form the subject matter of the invention individually and in any combination, independently of their combination in the individual claims or the cited relation of the claims. Further, in the drawings, the same reference numerals denote the same or similar objects.
Fig. 1 shows a schematic illustration of an advantageous embodiment of a system or of an apparatus.
Fig. 2 shows an exemplary design of the first image.
Fig. 3 shows an exemplary design of the reference display.
Fig. 4 shows an example diagram of a superposition of the fiducial display and the first image.
Fig. 5 shows an exemplary design of the second image.
Fig. 6 shows a further advantageous embodiment of the reference display of the block frame.
Fig. 7 shows an exemplary design of the third image.
Fig. 8 to 10 each show an advantageous embodiment of the method flowchart.
Detailed Description
Fig. 1 schematically shows an exemplary embodiment of a device 2. The device 2 has a signal input interface 4. The signal input interface 4 is designed to receive a first image signal. Furthermore, the device 2 has a data processing unit 6. The data processing unit 6 can comprise a processor unit and/or a data memory. The data processing unit 6 has a signal processing unit with a color filter. The signal processing unit can be a logic unit, which can be represented by the data processing unit 6 by means of a processor unit and/or a program stored on a data memory. However, the signal processing unit can also be formed in part by physical components of the data processing unit 6.
It is also preferably provided that the device 2 has a signal output interface 52. The signal output interface 52 can be configured to provide and/or transmit an output signal. The output interface 52 can also be referred to as a signal output interface 52.
As can be exemplarily recognized from fig. 1, the device 2 can be coupled to the image camera 46 via a first signal connection 48 and to the display device 44 via a second signal connection 50. Fig. 1 therefore also shows an exemplary embodiment of a system 42, which comprises a device 2, an image camera 46 and a display device 44, wherein the device 2 is connected to the camera 46 via a first signal connection 48 and to the display device 44 via a second signal connection 50. The first signal connection 48 can be a wired signal connection. For this purpose, a signal transmission cable can be connected with the input interface 4 and extend from the input interface 4 of the device 2 to the camera 46. In this case, the first signal connections 48 are formed by respective signal cables. Instead of a signal cable, however, a wireless first signal connection 48 can also be formed between the signal input interface 4 and the camera 46. The output interface 52 is coupled with the display device 44 via the second signal connection 50. The display device 44 is preferably an optical display device, such as a monitor, a tablet computer and/or a mobile terminal device having an optical display. The second signal connection 50 is preferably formed by a signal connection cable. However, the second signal connection 50 can also be formed by a wireless signal connection. However, if the second signal connection 50 is formed by a signal connection line, the second signal connection is connected with the output interface 52 and extends from the output interface 52 to the display device 44.
The display device 44 can be separately constructed. However, the display device 44 can also be integrated into a device comprising other components. The camera 46 can be constructed separately. However, the camera 46 can also be integrated into (yet) further devices with other components. Thus, the camera 46 can be part of an optical measuring device, for example.
In the system 42 illustrated by way of example in fig. 1, it is generally desirable for the object 54 captured by the camera 46 to be displayed by the display device 44 in the associated color as faithfully as possible. Due to external light influences and/or due to technical influences (for example optical lenses of the camera 46), in practice the image signals sent by the camera 46 via the first signal connection 48 to the signal input interface 4 of the device 2 can hardly represent the object 54 captured by the camera 46 faithfully in the associated color.
It is therefore provided for the device 2 that the device 2 and/or the associated data processing unit 6 are designed to generate verification image data which allows the image data processing to be checked by means of the device 2. Furthermore, methods are proposed, which are designed for generating the verification image data, as schematically illustrated, for example, in fig. 8, 9 and 10, respectively.
Even if advantageous elaborations, preferred features, effects and/or advantages of the method are described below, it is preferably provided that the respective advantageous elaborations, preferred features, effects and/or advantages can be applied in a similar manner to the system 42 and/or to the device 6, in particular with regard to the configuration of the associated data processing unit 6.
First, an exemplary design of the flowchart of fig. 8 is referenced. Accordingly, it is preferably provided that the method has steps a) to j). As can be seen schematically in fig. 8, steps a) to j) are performed in this order.
It is proposed according to step a) to receive the first image signal via the signal input interface 4 of the device 2. The device 2 has a data processing unit 6. A reference display 18 with a preset reference arrangement 20 of block frames 22 is stored by the data processing unit 6, which is schematically shown in fig. 3, for example. Furthermore, the data processing unit 6 has a signal processing unit with a color filter.
Here, the aforementioned device 2 can be part of a system 42, which is shown by way of example in fig. 1. In this case, an object 54, in particular a solid object, is captured by the image camera 46 of the system 42. Here, it can be a known and/or preset object 54. The object is a so-called reference color wheel. The reference color wheel has a plurality of first color patches arranged according to a checkerboard pattern type and/or in a grid display. The first color block can be arranged, for example, in such a manner as to be divided into four rows and six columns. Thus, a first arrangement of the first color patches of the reference color wheel as the object 54 can be formed according to the corresponding arrangement of the checkerboard pattern or the grid display. Here, each first color patch has a single assigned color or a single assigned color value. The color of the first color block is different. Preferably, the first color patches 16 are arranged in a distributed manner in the first arrangement 14 according to the display of the reference color wheel 10. The first image signal can represent the reference color wheel 10 when optically acquired by the camera 46 of fig. 1 as the reference color wheel of the object 54. The first image signal can be transferred from the camera 46 to the signal input interface 4 of the device 2 via a first signal connection 48. The signal input interface 4 of the device 2 is designed to receive a first image signal.
According to method step b), it is provided that, on the basis of the first image signal, measurement image data are generated by means of the data processing unit 6 of the device 2, wherein the measurement image data represent the first image 10 with the reference color wheel 12 having the first arrangement 14 of the first color patches 16. The first image 10 is schematically shown in fig. 2. Thus, measurement image data representing the first image 10 of the reference color wheel 12 is generated by means of the data processing unit 6. However, this first image 10 typically has a color deviation from a reference color wheel physically formed by the object 54. Thus, some color shares of the first image 10 can be darker than in the object 54 and other color shares lighter than in the actual object 5.
The method steps c) and d) described below can be performed in sequence. Thus, step d) can be performed after step c). However, steps c) and d) can also be performed in the reverse order. Furthermore, steps c) and d) can be performed in parallel and at least temporarily in parallel with each other.
Since the color of the first color patches of the reference color wheel formed by the object 54 is known in principle, as is the associated arrangement of these first color patches, the first color patches 16 in the first image 10 can likewise be recognized. For this purpose, a reference display 18 of a block frame 22 arranged in a reference arrangement 20 is used, which is schematically shown, for example, in fig. 3. The reference arrangement 20 of the block frame 22 thus represents a scalable arrangement, which is represented in the corresponding pattern of the first image 10 by the belonging first arrangement 14 of color blocks 16.
According to method step c), it is provided that, based on the reference display 18 and the measurement image data, the first color patches 16 are identified in the first image 10 by means of the data processing unit 6 of the device 2, such that each patch frame 22 is associated with one of the first color patches 16.
In the following, reference is made purely exemplarily to fig. 4. The superimposition of the reference display 18 with the first image 10 can be recognized from fig. 4. For this purpose, scaling of the reference arrangement 20 of block frames 22 can be performed such that each block frame 22 is superimposed with only one of the first color blocks 16. Accordingly, the first color patches respectively superimposed by the patch frames 22 can be associated with the respective patch frames 22. Each first tile 16 is associated with exactly one tile frame 22, or vice versa. Thus, the first color patch 16 can be identified based on the reference arrangement 20 of the patch frame 22 by means of pattern recognition. The first image 10 is represented by measured image data. Thus, the measurement image data is also used for identifying the first color patch 16 by the data processing unit. However, the association of the first color patches 16 with the patch frames 22 does not mean that the area enclosed by the patch frames 22 is filled only by the color of the associated first color patches 16. This is because it is proposed that the total area of each block frame 22 is divided into a first face section 34, a second face section 36 and a third face section 38, as can be seen, for example, from fig. 6. In principle, each block frame 22 can also have at least one further surface section, so that the total area of the block frame 22 is divided into a corresponding number of surface sections 34, 36, 38. For further discussion, however, the starting point is illustratively that each block frame 22 is divided into the three face sections 34, 36, 38 set forth previously. It is preferably provided here that each first surface portion 34 is filled with the color of the respectively associated first color block 16. This is discussed further below. The generation of target image data is discussed first.
According to method step d), it is provided that, at least on the basis of the measurement image data, target image data are generated by means of a color filter of the signal processing unit, such that the target image data represent the second image 26 with the color wheel 28. The second image 26 is shown schematically in fig. 5. The color wheel 28 of the second image 26 has a second arrangement 30 of second color blocks 32 identical to the first arrangement 14, so that each block frame 22 is associated in a corresponding manner with a respective one of the second color blocks 32. Thus, each block frame 22 is also associated with one of the second color blocks 32.
The signal processing unit can be formed physically and/or logically by the data processing unit 6 of the device 2. The same applies to the color filter. Thus, the color filter can be a logical and/or physical construction scheme of the data processing unit 6 of the device 2. The color filter can be configured as an adjustable color filter. Thus, the color filter can be configured, for example, via adjustable parameters. These parameters are presettable at least in the first embodiment of the method. By means of the adjustable parameters, for example, the specific color values represented by the first image by the measurement image data can be changed, in particular enlarged and/or reduced. The color filter can have setting parameters for a plurality of color components (e.g., red, green, and blue). Thus, the green portion, the red portion, and/or the blue portion can be increased and/or decreased, and/or increased and/or decreased by a corresponding adjustment of the parameters. Thus, target image data is formed by performing color filtering on the measurement image data. The adjustable parameters of the color filter are typically adjusted as follows: the second image 26 represented by the target image data is better in color to show the object 54 actually optically acquired by the camera 46 than the first image 10 represented by the measured image data. However, it cannot be directly learned from the second image 26 itself whether the second image 26 represented by the target image data does indeed better represent the color of the object 54. The comparison of the second image 26 with the first image 10 in fig. 2 does not directly lead to a conclusion whether the second image 26 indeed better represents the color of the object 54.
In the preceding paragraph, purely exemplary reference is made to a color gamut having red, green and blue colors. However, the preceding statements can be applied in a similar way to other color gamuts with other colors, and thus for example to any of the color gamuts HSI, HSV, YUV and CMYK.
Note, however, that the object 54 is formed by a known reference color wheel entity. The physical reference color wheel has color patches whose colors or color values, respectively, are known. The patch arrangement of the physically constructed reference color wheel is also known. This arrangement corresponds to the reference arrangement 20 of color blocks 22, which is schematically shown in fig. 3, for example. Thus, a dedicated reference color value representing the associated reference color is stored by the data processing unit 6 for each block frame 22. The reference color value or reference color corresponds to a known color value or color of the color patch of the reference color wheel forming the physical structure of the object 54. In other words, by means of the association of the dedicated reference color values with the block frame 22, information about the color or color value of the color blocks of the object 54 is stored by the data processing unit. Thus, the base color represented by the base color value can be used to generate verification image data, which represents the third image of FIG. 6 having the block frames 18, wherein the different face sections 34, 36, 38 of each block frame 22 reflect the different colors associated with the respective block frame 22. For this purpose, however, it is first necessary to determine the color values of the first and second color blocks 16, 32 and then to associate the corresponding color values with the surface sections 34, 36, 38. This is now explained below on the basis of the method features e) to i).
Steps e) to i) can be performed in the order presented. However, steps e) to i) can also be performed in a different order than alphabetical. Thus, for example, step g) can be performed after step e) and before step f). Another variant of the sequence of steps e) to i) can be, for example, that steps e) and f) are performed sequentially, in parallel or in reverse order. Subsequently, steps g) to i) can be performed sequentially, in parallel and/or in reverse order. Other variants for performing steps e) to i) are equally possible.
According to method step e), a respective first color value is determined for each first color patch 16 of the first image 10 by means of the data processing unit 6 of the device 2, wherein each first color value represents a color of the respective first color patch 16 of the first image 10 which is represented by means of the measured image data. Step e) is therefore preferably used to determine the color or color value of the first color block 16 of the first image 10. This is because the determined color is required for filling the first surface section 34 of the tile frame 22 associated with the respective first color tile 16.
According to step g), the first surface section 34 of each block frame 22 is associated with the color values of the respectively associated first color patches 16 of the first image 10 by means of the data processing unit 6. Furthermore, it can be provided that each first surface portion 34 has a color determined and/or represented by a corresponding color value. The area formed by the respective first surface section 34 can therefore preferably have only the respectively associated color. If, for example, a first color value representing green is determined in step d) for a first color block 16, it can be provided in step g) that the first surface section 34 of the block frame 22 associated with the aforementioned first color block 16 is associated with a corresponding color value which likewise represents green. Furthermore, it can be provided that the first surface portion 34 is formed by a green area corresponding to the color value.
Since each block frame 22 has an associated first surface section 34, the first surface sections 34 of the plurality of block frames 22 can each have a color which is determined by the first color block 16 associated with the block frame 22 as described above.
According to method step f), it is provided that, as shown in fig. 5 by way of example, a second color value is determined for each second color block 32 of the second image 26. In this case, each second color value represents the color of the respective second color block 32 represented by means of the target image data. The second color values are determined by means of the data processing unit 6 of the device 2. In this case, the target image data are likewise generated by means of the data processing unit 6 by color filtering the first measurement image data. However, the second image 26 represented by the target image data changes in color relative to the first image 10. However, the second image 26 has a second arrangement 30 of second patches 32. Therefore, in step f), the second color value of the second color patch 32 is determined. Each second color value here represents the color of the second color patch 32. This information is used to associate the corresponding color or color value with the second face segment 36 of the block frame 22.
According to method step h), the second surface portion 36 of each block frame 22 is associated with the color value of the respectively associated second color block 32 by means of the data processing unit. Here, the second reference arrangement 30 of the second color patches 32 corresponds to the first arrangement 14 of the first color patches 16. It has been determined in step c) that each block frame 22 is associated with one of the first colour blocks 16. This is based on the identification of the first colour block 16 in the first image 10 based on the reference display 18 of the reference arrangement 20 of the block frame 22. It follows that an association is formed between the first colour block 16 in the first arrangement 14 and the block frame 22 in the reference arrangement 20. On the basis of this, it is therefore also possible to associate, by means of the data processing unit 6, a second color patch 32 in a second arrangement 30 with the patch frame 22, in a similar manner to the association of the first color patch 16 with the patch frame 22, wherein the second arrangement corresponds to the first arrangement 14. The method and/or the data processing unit 6 are preferably configured for this purpose. Therefore, it is also possible to associate with each second surface portion 36 of the block frame 22 a color value which is determined in step f) by the second color value of the second color block associated with the respective block frame. Thus, the areas formed by the respective second surface sections 36 can have only the respectively associated color.
Furthermore, a respective associated dedicated reference color value is stored by the data processing unit for each block frame 22. Each reference color value can represent a single, associated reference color. The reference color values of the block frame 22 are different from each other. Here, the reference color value reflects the color of the real existence of the patch of the object 54.
Thus, according to step i), the third surface section 38 of each block frame 22 is associated with the associated reference color value by means of the data processing unit 6. By associating each third surface segment 38 with the associated reference color value representing the respective reference color, it is also preferably provided that each third surface segment 38 is associated with the respective reference color. The reference color preferably corresponds to the color of the patch of the reference color wheel formed by the object 54. In this case, the area of each third surface section 38 can be filled with a reference color. The third face segment 38 can be used as a reference to allow for deviations from the color of the first face segment 34 or the second face segment 36 of the respective same frame 22. However this is not part of the method. More precisely, it is preferably provided that a verification image data is generated which represents a third image which reflects the block frame 22 with the aforementioned surface portions 34, 36, 38. Thus, the verification image data can be used to perform or enable subsequent evaluation.
According to step j), it is proposed that, on the basis of the reference representation 18 of the block frame 22 and the color values associated with the surface portions 34, 36, 38, the verification image data are generated by means of the data processing unit 6 of the device in such a way that the verification image data represent a third image 40 with the block frame 22 in the reference arrangement 20, which is shown, for example, in fig. 7, in which each surface portion 34, 36, 38 has a color determined by the respectively associated color value. Preferably, each surface portion 34, 36, 38 is formed by a respective associated surface area which has only a color determined by the respective associated color value.
An image 40 represented by correspondingly generated verification data is illustrated in fig. 7. Thus, the image 40 shows the block frames 22 in the reference arrangement 20, wherein each block frame 22 is divided into a first face section 34, a second face section 36 and a third face section 38. Here, the first face section 34 of each block frame 22 has an area having a color determined by the corresponding first color block 16 of the first image 10. Preferably, the first face section 34 is formed entirely by the respective area. Here, the second face section 36 of each block frame 22 has a color determined by the corresponding second color block 32. In this case, each second surface portion 36 can be formed completely by the associated area having the respective color. In this case, the third surface section 38 of each block frame 22 has an area which has a color determined by the corresponding reference color value. The third surface section 38 can be formed entirely from this surface area. Thus, transition edges can be formed between the surface sections 34, 36, 38 of the respective same frame 22, which transition edges optically allow a simple recognition of contrast and/or color differences by the observer. In this case, the third surface section 38 reflects the color that the first or second surface section 34, 36 should have. In this case, as a practical matter, the first surface section 34 is generally not of the same color as the third surface section 38 of the same frame 22. However, the change can be brought about by means of the data processing unit 6 by applying a color filter such that the color of the second face section 36 of the same frame 22 is completely or at least approximately identical to the color of the third face section 38. In particular, a direct comparison at the transition edge of the second surface section 36 to the third surface section 38 of the same frame 22 makes it possible to identify the degree of differentiation that may remain. Furthermore, it can be concluded from the transition edge of the first surface section 34 to the second surface section 36 of the same frame 22, at which intensity the color has to be changed by the color filter in order to match the color of the third surface section 38 to be realized.
By means of the plurality of block frames 22 shown in the third image 40, the adjusted parameters of the color filter or the corresponding color filtering can be evaluated optically. This can be applied to different colors. In particular, each of the plurality of different colors can be unitarily associated with at least one tile frame 22.
As can be seen by way of example in fig. 6 or 7, it is preferably provided that the total area of each block frame 22 is divided into associated surface sections 34, 36, 38. It can thereby be achieved particularly advantageously that a transition edge is formed at each transition between two surface sections 34, 36, 38 of the same frame 22, which transition edge particularly simply allows a color contrast between the colors of the surface sections 34, 36, 38.
It has furthermore proven to be advantageous if the block frames 22 each have the same shape and/or size. Thereby, the block frames 22 can be arranged according to the checkerboard pattern type. It is preferably also provided that the first surface sections 34 of the plurality of block frames 22 each have the same shape and/or size. Each first surface section 34 can have, for example, the same wedge shape with the same surface size. Each of the second face sections 36 of the plurality of block frames 22 is also preferably configured such that each of the second face sections 36 has the same shape and/or size. Thus, each second face section 36 can, for example, have the same wedge shape with the same face size. It is also preferably provided that the third surface sections 38 of the plurality of block frames 22 are designed in such a way that the third surface sections 38 each have the same shape and/or size. It is therefore preferably provided that each third surface section is designed as a triangle of the same size. The first, second and third surface sections 34, 36, 38 of the same frame 22 can thus be arranged in combination such that the frame 22 is rectangular, in particular square.
It is preferably provided that the block frames 22 each have the same, at least substantially rectangular shape, wherein the first, second or third surface sections 34, 36, 38 of each block frame 22 are each triangular in shape, and the two further block sections of the respective block frame 22 have a mirror-symmetrical shape.
The first image signal provided by the image camera 46 in fig. 1 generally represents an original image of the object 54. At this time, the original image can reflect the actual object 54 too brightly or too darkly, for example, due to the optical light effect. In practice, it has therefore proven advantageous to generate the measurement image data such that the first image is an original image which has changed in average brightness. It is therefore preferably provided for the method that the first image signal represents the acquired original image, wherein in step b) the measurement image data are generated by means of the data processing unit 6 on the basis of the first image signal, so that the first image 10 is the original image changed in average brightness. Therefore, the average luminance of the first image 10 can be greater or less than the average luminance of the original image. The change of the average brightness can be made based on a deviation of a preset brightness value of a color of the original image with respect to the preset brightness value. Thus, for example, a preset gray value of the original image can be used in order to use the associated brightness proportional to the reference brightness, so that a change based thereon of the average brightness of the original image is applied to generate the first image 10 or the measurement image data. The data processing unit 6 can be configured for improved purposes.
In method step d), the target image data are generated by means of a color filter of a signal processing unit of the data processing unit 6 of the device 2. It is preferably provided that the target image data are generated by means of a signal processing unit by means of a color-dependent filtering of the measurement image data by means of a color filter. Thus, by means of the color filter, the specific color share of the first image 10 represented by the measurement image data can be reduced and/or enhanced. The color filter can be designed to filter different color values of the first image 10 represented by the measurement image data. By means of color filtering, target image data is generated from the measurement image data, which target image data in turn represents the second image 26. This second image 26 can be used for being displayed on a (further) display device. Here, the target image display can be referred to. Furthermore, it has proven advantageous if the color filter is designed as a data filter which can be adjusted by parameters, wherein in method step d) the parameters for adjusting the color filter are determined by means of the data processing unit 6 such that the sum of errors formed by the numerical differences between the second color values associated with the respective same frame 22 and the reference color values is smaller than a predetermined error threshold value or is minimal. The parameters for adjusting the color filter can be determined, for example, by the data processing unit 6 in such a way that the sum of the differences between the color values associated with the second surface portion 36 and the color values associated with the third surface portion 38 of the same frame 22 is minimal. In this case, therefore, the difference between the colors of the second and third surface sections 36, 38 of the same block frame 22 is particularly small or even minimal in relation to the sum of the differences of all block frames 22. This ensures that the second image 26 displays the object 54 particularly well.
Furthermore, it has proven to be advantageous for the method to have a step j1), according to which an output signal is emitted and/or provided by the output interface 52 of the device 2, wherein the output signal represents the verification image data and/or the third image 26. The output signal can therefore be transmitted to a further unit, in particular to the display unit 44, by means of the output interface 52, in order to display the third image 26 here. Fig. 9 shows a flow chart of the method purely by way of example, wherein a further step j1) is carried out after step j).
Furthermore, it has proven advantageous if the method has a further step k) of optically displaying the third image 40 by means of a display unit 44. A further step k) can be performed directly or indirectly after step j). It can thus be provided, for example, that step k) is carried out after step j), as is shown by way of example in fig. 10. However, a further step j1) can also be performed between step j) and step k). In particular, the system 42 can be used to perform step k).
It should additionally be noted that "having" does not exclude other elements or steps and "a" or "an" does not exclude a plurality. Furthermore, it should be pointed out that features which have been described with reference to one of the above embodiments can also be used in combination with other features of other above embodiments. Reference signs in the claims shall not be construed as limiting.
List of reference numerals
2 apparatus
4 signal input interface
6 data processing unit
10 first image
12 reference color disc
14 first row cloth
16 first color block
18 reference display
20 base arrangement
22 pieces of frame
26 second image
28 color disc
30 second arrangement
32 second color block
34 first face section
36 second face section
38 third face segment
40 third image
42 system
44 display device
46 image camera
48 first signal connection
50 second signal connection
52 output interface
54 object.

Claims (19)

1. A device (2) having:
a signal input interface (4) for receiving the first image signal, and
a data processing unit (6) having a processor unit,
wherein the data processing unit (6) is configured to generate measurement image data based on the first image signal, the measurement image data representing a first image (10) having a reference color wheel (12) with a first arrangement (14) of first color patches (16),
wherein the data processing unit (6) stores a reference display (18) having a preset reference arrangement (20) of block frames (22),
wherein the data processing unit (6) is configured to identify the first color patches (16) in the first image (10) based on the reference display (18) and the measurement image data, thereby associating each patch frame (22) with one of the first color patches (16),
wherein the data processing unit (6) has a signal processing unit (24) with a color filter,
wherein the data processing unit (6) is configured to generate target image data by means of the color filter at least indirectly on the basis of the measurement image data such that the target image data represents a second image (26) with a color wheel having a second arrangement (30) of second color patches identical to the first arrangement (14), thereby associating each patch frame (22) with one of the second color patches (32),
wherein the data processing unit (6) is configured to determine for each first color patch (16) an associated first color value which represents the color of the respective first color patch (16) represented by the measurement image data,
wherein the data processing unit (6) is configured to determine, for each second color patch, a second color value representing the color of the respective second color patch (32) represented by the target image data,
wherein a dedicated reference color value representing the associated reference color is stored by the data processing unit (6) for each block frame (22),
wherein each block frame (22) has at least one first face section (34), at least one second face section (36) and at least one third face section (38),
wherein the data processing unit (6) is configured to associate the first face section (34) of each tile frame (22) with a color value of the respectively associated first color tile (16),
wherein the data processing unit (6) is configured to associate the second face section (36) of each tile frame (22) with a color value of the respectively associated second color tile (32),
wherein the data processing unit (6) is configured to associate the third facet segment (38) of each block frame (22) with the reference color value to which it belongs, and
wherein the data processing unit (6) is configured to generate a verification image data based on the reference display (18) of the block frame (22) and the color values associated with each facet segment (34, 36, 38) such that the verification image data represents a third image (40) having the block frame (22) in the reference arrangement (20), wherein each facet segment (34, 36, 38) has a color determined by the respectively associated color value.
2. The apparatus (2) according to the preceding claim, characterized in that the total area of each block frame (22) is divided into a first face section (34), a second face section (36) and a third face section (38).
3. Device (2) according to the preceding claim, characterized in that the first face segments (34) respectively have the same shape and/or size, the second face segments (36) respectively have the same shape and/or size, and/or the third face segments (38) respectively have the same shape and/or size.
4. The apparatus (2) according to one of the preceding claims, characterized in that the block frames (22) each have the same, substantially rectangular shape, wherein the first, second or third face section of each block frame (22) is respectively configured as a triangle and the other two face sections of the respective block frame (22) have a mirror-symmetrical shape.
5. Device (2) according to any one of claims 1 to 3, characterized in that the first image signal represents an acquired raw image, wherein the data processing unit (6) is configured to generate the measured image data based on the first image signal such that the first image (10) is a raw image that changes in average brightness.
6. Device (2) according to one of claims 1 to 3, characterized in that the signal processing unit is configured to generate the target image data by color-dependent filtering of the measurement image data by means of the color filter.
7. Device (2) according to one of claims 1 to 3, characterized in that the color filter is configured as a data filter which can be adjusted by parameters.
8. The device (2) according to the preceding claim, characterized in that the data processing unit (6) is configured to find the parameters for adjusting the color filter such that a sum of errors constituted by numerical differences between the second color values and the reference color values associated with the respective same block frame (22) is smaller than a preset error threshold or is minimal.
9. Device (2) according to one of claims 1 to 3 and 8, characterized in that the device (2) has an output interface for providing an output signal, wherein the data processing unit is configured for generating the output signal on the basis of the verification image data such that the output signal represents the third image (40).
10. A system (42) having:
an image camera (46) for capturing raw images,
the device (2) according to any one of the preceding claims, and
an optical display device (44),
wherein the image camera (46) is configured to generate a first image signal representing the acquired original image,
wherein the image camera (46) is connected with the signal input interface (4) of the device (2) via a first signal connection (48) for transmitting the first image signal to the device (2),
wherein the display device (44) is connected to the device (2) via a second signal connection (50) in order to transmit an output signal from the device (2) to the display device (44), which output signal represents the verification image data and/or the third image, and
wherein the display device (44) is designed to optically display the third image (40) on the basis of the verification image data.
11. The system (42) according to the preceding claim, wherein the display device (44) is configured as a mobile display device.
12. An image processing method having steps a) to j):
a) receiving a first image signal via a signal input interface (4) of an apparatus (2) having a data processing unit (6) with a processor unit, wherein the data processing unit (6) stores a reference display (18) with a preset reference arrangement (20) of block frames (22), and wherein the data processing unit (6) has a signal processing unit with a color filter;
b) generating, by means of the data processing unit (6), measurement image data based on the first image signal, wherein the measurement image data represents a first image (10) having a reference color wheel (12) with a first arrangement (14) of first color patches (16);
c) -identifying, by means of the data processing unit (6), the first colour patches (16) in the first image (10) on the basis of the reference display (18) and the measurement image data, thereby associating each patch frame (22) with one of the first colour patches (16);
d) generating target image data by means of the color filter of the signal processing unit at least indirectly on the basis of the measurement image data such that the target image data represents a second image (26) with a color wheel (28) having a second arrangement (30) of second color patches (32) identical to the first arrangement (14), thereby associating each patch frame (22) with one of the second color patches (32);
e) determining a first color value for each first color patch (16) by means of the data processing unit (6), wherein each first color value represents the color of the respective first color patch (16) represented by the measurement image data;
f) determining a second color value for each second color patch (32), wherein each second color value represents a color of the corresponding second color patch (32) represented by the target image data;
wherein a dedicated reference color value representing the associated reference color is stored for each block frame (22) by the data processing unit (6), and
wherein each block frame has at least one first face section (34), at least one second face section (36) and at least one third face section (38);
g) -associating, by means of the data processing unit (6), the first face section (34) of each block frame (22) with the color values of the respectively associated first color block (16);
h) -associating, by means of the data processing unit (6), the second surface section (36) of each block frame (22) with the color values of the respectively associated second color block (32);
i) -associating, by means of the data processing unit (6), the third facet segment (38) of each block frame (22) with the associated reference color value; and
j) on the basis of the reference display (18) of the block frame (22) and the color values associated with each area section (34, 36, 38), verification image data are generated by means of the data processing unit (6) such that they represent a third image (40) having the block frame (22) in the reference arrangement (20), wherein each area section (34, 36, 38) has a color determined by the respectively associated color value.
13. The method according to the preceding claim, characterized in that the total area of each block frame (22) is divided into a first face section (34), a second face section (36) and a third face section (38).
14. Method according to the preceding claim, characterized in that the first face segments (34) respectively have the same shape and/or size, the second face segments (36) respectively have the same shape and/or size, and/or the third face segments (38) respectively have the same shape and/or size.
15. The method according to one of claims 12 to 14, characterized in that the block frames (22) each have the same, substantially rectangular shape, wherein the first, second or third face section (34, 36, 38) of each block frame (22) is respectively configured as a triangle and the other two face sections of the respective block frame (22) have a mirror-symmetrical shape.
16. Method according to any one of claims 12 to 14, characterized in that the first image signal represents an acquired original image, wherein in step b) the generation of measurement image data is effected by means of the data processing unit (6) on the basis of the first image signal such that the first image (10) is an original image that changes in average brightness.
17. Method according to any one of claims 12 to 14, characterized in that the target image data is generated by means of the signal processing unit by color-dependent filtering of the measurement image data by means of the color filter.
18. The method according to one of claims 12 to 14, characterized in that the color filter is configured as a data filter which can be adjusted by means of parameters, wherein in step d) the parameters for adjusting the color filter are determined by means of the data processing unit (6) such that the sum of errors formed by the numerical differences between the second color values and the reference color values associated with the respective same block frame (22) is smaller than a preset error threshold value or is minimal.
19. Method according to any of claims 12 to 14, characterized by a further step k): -displaying the third image (40) optically by means of a display unit.
CN201911166060.XA 2018-12-03 2019-11-25 Apparatus, system and method Active CN111263140B (en)

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