KR102141556B1 - Driving Method Of 3D Display Device - Google Patents

Abstract

The present invention provides a method for driving a stereoscopic display device equipped with stereoscopic means, comprising: a first step of receiving image data; A second step of sampling a gradation value indicated by each pixel of the first and second pixel lines located at a boundary where a first image output from the top of the image data and a second image output from the bottom are separated; A third step of calculating a gradation deviation which is a difference between a gradation value of each pixel of the first pixel line and a gradation value of each pixel d of the second pixel line, and calculating and storing an average value of the gradation deviations; A fourth step of comparing the average value of gradation deviations with a stereoscopic image reference value; It provides a method of driving a stereoscopic display device including a fifth step of performing an image driving according to the comparison result of the fourth step.

Description

Driving method of stereoscopic display device {Driving Method Of 3D Display Device}

The present invention relates to a driving method of a stereoscopic display device capable of automatically switching image driving for each of a flat image and a stereoscopic image.

The display device developed from a conventional cathode ray tube display device (CRT Display Device) and has recently developed into a display device using a liquid crystal or an organic light emitting diode. A three-dimensional display device that illuminates different images on the left and right eyes of the user by using a panel equipped with stereoscopic means such as a lenticular lens, a liquid crystal lens, a polarizing plate and a polarizing glasses, a liquid crystal switching glasses to further develop the user to feel a three-dimensional effect Was proposed.

The stereoscopic image data represented by the stereoscopic display device is a single object, or a scene observed at two different locations with respect to space, is recorded in one frame. In general, the first image captured at two different locations in one frame And a second partial image.

In order to express such a stereoscopic image, the stereoscopic display device must be able to perform stereoscopic image driving. In the conventional stereoscopic display device, since stereoscopic image driving and flat image driving are selected according to a user's setting, the stereoscopic image is driven by a flat image Or, a case in which a flat image is driven by a stereoscopic image occurs.

This case will be described with reference to FIGS. 1A and 1B below.

FIG. 1A shows an image data array when driving a 3D image data, and FIG. 1B shows an image data array when driving a 3D image data.

In order for the stereoscopic image data 3D illustrated in FIG. 1A to be normally implemented, the data must be rearranged inside the stereoscopic display device and arranged in the following order: L1, R1, L2, R2, L3, R3, ... As described above, when image driving is selected according to a user's setting, it may occur that stereoscopic image data is driven as a flat image.

In this case, the stereoscopic image data is not rearranged, and is arranged as L1, L2, L3, ..., R1, R2, R3, ... as shown in FIG. 1A, so as to appear as two independent images.

Therefore, the user cannot watch the stereoscopic image normally, and thus simply views two independent images.

On the other hand, in order for the flat image data 2D shown in FIG. 1B to be normally implemented, it should be arranged in the order of 1, 2, 3, 4, 5, 6 without rearranging the data inside the stereoscopic display device. As described above, when image driving is selected according to a user's setting, a case in which flat image data is driven in a stereoscopic image may occur.

In this case, the flat image data is rearranged and arranged as 1, 4, 2, 5, 3, 6 as shown in FIG. 1B, so that the image is not recognized by the user.

Therefore, the user cannot watch the flat image normally, so the abnormal image in which the data is mixed is viewed.

For this reason, when an image driving that is not suitable for expressing a stereoscopic image or a flat image is selected, the stereoscopic display device expresses an abnormal image, and accordingly, a user cannot view a normal image.

The present invention seeks to solve a problem in which an unrecognizable image is displayed because an image driving selection suitable for representing a stereoscopic image or a flat image is not performed by the stereoscopic display device.

In order to achieve the above object, the present invention provides a driving method of a stereoscopic display device equipped with stereoscopic means, comprising: a first step of receiving image data; A second step of sampling a gradation value indicated by each pixel of the first and second pixel lines located at a boundary where a first image output from the top of the image data and a second image output from the bottom are separated; A third step of calculating a gradation deviation which is a difference between a gradation value of each pixel of the first pixel line and a gradation value of each pixel d of the second pixel line, and calculating and storing an average value of the gradation deviations; A fourth step of comparing the average value of gradation deviations with a stereoscopic image reference value; It provides a method of driving a stereoscopic display device including a fifth step of performing image driving according to the comparison result of the fourth step.

In addition, the first image defines one surface of the stereoscopic display device divided into 1:1 as a boundary of the first image, and the second image is the first image among the stereoscopic display device divided into 1:1. Another undefined side is characterized by defining the boundary of the second image.

In addition, the fifth step may include: performing stereoscopic image driving when the deviation average value is greater than or equal to the stereoscopic image reference value; And if the average deviation value is less than the stereoscopic image reference value, performing a planar image driving.

Also, the stereoscopic image reference value is 30% of the maximum gradation value of the image data.

And, between the third and fourth steps, a sixth step of comparing the number of calculations of the average value of the gradation deviations with a reference number; When the calculated number of times is less than the reference number of times, further comprising a seventh step of repeating the second and third steps.

On the other hand, the present invention, a driving method of a stereoscopic display device equipped with a stereoscopic means, comprising: a first step of receiving image data; A second step of sampling a gradation value indicated by each pixel of the first and second pixel lines located at a boundary where a first image output from the left side of the image data and a second image output from the right side are separated; A third step of calculating a gradation deviation which is a difference between a gradation value of each pixel of the first pixel line and a gradation value of each pixel of the pixel line of the second image, and calculating and storing an average value of the gradation deviations; A fourth step of comparing the average value of gradation deviations with a stereoscopic image reference value; It provides a method of driving a stereoscopic display device including a fifth step of performing an image driving according to the comparison result of the fourth step.

In addition, the first image defines one surface of the stereoscopic display device divided into 1:1 as a boundary of the first image, and the second image is the first image among the stereoscopic display device divided into 1:1. Another undefined surface is a driving method of a stereoscopic display device characterized by defining as a boundary of the second image.

The fifth step is characterized by performing stereoscopic image driving when the deviation average value is greater than or equal to the stereoscopic image reference value, and performing flat image driving when the deviation average value is less than the stereoscopic image reference value.

Further, the stereoscopic image reference value is 30% of the maximum gradation value of the image data.

And, between the third and fourth steps, a sixth step of comparing the number of calculations of the average value of the gradation deviations with a reference number; When the calculated number of times is less than the reference number of times, further comprising a seventh step of repeating the second and third steps.

The stereoscopic display device according to the present invention automatically analyzes the received image data to determine the format of the image, and performs stereoscopic image driving or flat image driving according to the determination result, thereby allowing the stereoscopic image data and the flat image to be changed without changing the user's settings. Data can be represented normally.

FIG. 1A shows an image data array when driving a 3D image data, and FIG. 1B shows an image data array when driving a 3D image data.
2 is a block diagram showing an algorithm for a method of driving a stereoscopic display device according to a first embodiment of the present invention.
FIG. 3 is a table showing grayscale values and average values of pixels located at the boundaries of the left-eye image and the right-eye image of the stereoscopic display device according to the first embodiment of the present invention.
4 is a block diagram showing an algorithm for a method of driving a stereoscopic display device according to a second embodiment of the present invention.
FIG. 5 is a table showing grayscale values and average values of pixels located at the boundaries of the left-eye image and the right-eye image of the stereoscopic display device according to the second embodiment of the present invention.

Hereinafter, a driving method of a stereoscopic display device according to an embodiment of the present invention will be described with reference to the drawings.

In the first embodiment of the present invention, the type of image data is determined by the timing controller, and one of stereoscopic image driving and flat image driving is selected and performed according to the determined type of image data.

At this time, it is assumed that the stereoscopic image data has a vertical division configuration.

2 is a block diagram showing an algorithm for a method of driving a stereoscopic display device according to a first embodiment of the present invention.

As shown in FIG. 2, the stereoscopic display device performs driving according to steps 1 to 8 (S1 to S8) to determine a stereoscopic image and a flat image, and performs driving of the stereoscopic display device according to the determined result. Can.

In a first step (S1 ), the stereoscopic display device is driven according to a user's power signal input.

When a user inputs a power signal to view a stereoscopic image or a flat image, the stereoscopic display device drives the device according to the input power signal.

In this case, the power signal may be a switch directly connected to a stereoscopic display device or a means capable of communicating at a long distance, such as infrared communication.

In a second step (S2 ), image data applied from the outside is input to the timing controller.

The externally applied image data includes a 10-bit gradation value 1024 to be transmitted to each pixel to represent one frame, and the stereoscopic image data applied in this step is as mentioned above. For example, the left eye image is recorded in the upper part and the right eye image is recorded in the lower part.

In the third step (S3), sampling of image data for two horizontal lines among the received image data is performed.

The timing controller that receives the image data analyzes gradation values of the image data corresponding to two horizontal lines located adjacent to each other and centered among the input image data.

At this time, the gradation values of pixels sampled in each horizontal line may be stored in a storage unit connected to the timing controller, and the storage unit may be formed inside or outside the timing controller.

In a fourth step (S4 ), an average value of a deviation of image data of each of upper and lower adjacent pixels among the two horizontal lines is calculated.

The deviation of the image data of each of the upper and lower adjacent pixels analyzed in the third step S3 is calculated by the timing controller.

At this time, the reason for comparing the vertically adjacent pixels among the two horizontal lines is to determine the continuity of the image, and most flat images have similarly measured grayscale values of the vertically adjacent pixels even in the two horizontal lines located in the center. On the other hand, in the stereoscopic image, the grayscale value of each vertically adjacent pixel in two horizontal lines located in the center represents a difference of 30% or more.

In the fifth step (S5 ), if n frames of the input image data are judged to be n or more, the process proceeds to the next step. If n or less, the third and fourth steps (S3 and S4) are repeatedly performed.

This is to increase the accuracy of determining the type of image by repeatedly performing the same operation in determining the type of image data, and the third and fourth steps (S3, S4) are performed once for one frame (n= 1) Although it may be performed, the third and fourth steps S3 and S4 may be repeatedly performed multiple times for a plurality of frames.

However, if the third and fourth steps (S3, S4) are repeatedly performed on the image data, the time for outputting the image may be delayed. It is preferable to perform the four steps (S3, S4) repeatedly.

In the sixth step (S6), the average value of the deviations for n frames and the size of the stereoscopic image reference value are determined.

As a result of the determination, if the average value of the deviation is greater than or equal to the reference value of the stereoscopic image, the input image is judged as a stereoscopic image, and step 7a (S7a) is performed. If the average value of the deviation is less than or equal to the stereoscopic image reference value, the input image is judged as a flat image. Step 7b (S7b) is performed.

On the other hand, the stereoscopic image reference value can be changed according to the setting. In the first embodiment of the present invention, 30% of the maximum grayscale value, that is, 307 is shown, but this may be changed depending on the case.

In the seventh step (S7 ), each of the seventh step (S7a) or the seventh step (S7b) is performed according to the determination result of the image data input in the sixth step (S6 ).

In step 7a (S7a), if the average value of the deviations for n frames in the sixth step (S6) performed is greater than or equal to the stereoscopic image reference value, it is determined as a stereoscopic image and rearranges the image data appropriately for the stereoscopic means and outputs it. If the average value of the deviations for n frames in the 7th step (S7b) is performed in the 6th step (S6) is less than the stereoscopic image reference value, it is determined as a flat image to maintain the arrangement of image data.

At this time, the flat image represents an image in which a stereoscopic feeling is not felt when viewed, and may be rearranged such that the same image can be input to the left and right eyes by the stereoscopic means.

In the eighth step S8, image data is output according to the driving selected in the seventh and seventh steps S7a and S7b.

At this time, when the stereoscopic display device continuously receives image data and changes from a flat image to a stereoscopic image or a stereoscopic image to a flat image, the second to sixth steps (S2 to S6) are repeated to perform the seventh step (S7a). ), or the 7B step (S7b) may be selected.

In the first to eighth steps (S1 to S8), a stereoscopic image and a flat image are judged by using a deviation average value of upper and lower adjacent pixels of two horizontal lines positioned at the center of the image, and the stereoscopic image is driven according to the determination result, or It simply shows the algorithm of a stereoscopic display device for driving a flat image.

A stereoscopic display device including a timing controller having such an algorithm performs first driving or second driving using a value measured by a timing controller, which will be described with reference to FIG. 3 below.

FIG. 3 is a table showing a mean value of a deviation between a stereoscopic image input to a stereoscopic display device according to a first embodiment of the present invention, and upper and lower adjacent pixels of two horizontal lines positioned at the center of the stereoscopic image.

As illustrated in FIG. 3, in the stereoscopic display device according to the first embodiment of the present invention, a panel in which 1920 vertical pixel lines and 1080 horizontal pixel line pixels are arranged is taken as an example.

At this time, a 540 horizontal pixel line is located at the boundary of the left-eye image, and a 541 horizontal pixel line is located at the boundary of the right-eye image.

First to 1920th pixels are formed in the 539th and 541th horizontal pixel lines representing the boundary between the left-eye and right-eye images, and the gradation values and the deviation values of them are respectively 540th horizontal pixels in the table shown in FIG. 3. Line L, 541th horizontal pixel line R, Δ|(LR)|.

The average value Δ|(LR)| for the gradation deviation of each pixel formed in the 540th horizontal pixel line L and the 541th horizontal pixel line R is about 502, but is not an artificially produced plane image. △|(LR)| is 30% of the maximum gradation value, that is, it is very rare to exceed 307, so it is determined that the input image is a stereoscopic image based on this, and the stereoscopic image is driven. It is rearranged according to the stereoscopic means of the stereoscopic display device and then output.

Meanwhile, the average value Δ|(LR)| for the gradation deviation of each pixel formed in the 540th horizontal pixel line L and the 541th horizontal pixel line R becomes less than 30% of the maximum gradation value, that is, less than 307 In this case, the stereoscopic display device may determine that the input image is a flat image and perform flat image driving.

The stereoscopic display device driven as described above determines whether the input image is a stereoscopic image or a flat image based on an average grayscale value measured during one frame of the input image, and performs stereoscopic image driving or flat image driving according to the result. Therefore, it is possible to change the image driving in a short time, and it is possible to increase convenience by not requiring a separate operation from the user.

On the other hand, the first embodiment relates to a driving method for determining a stereoscopic image and a flat image by analyzing image data when the input stereoscopic image is separated to the upper and lower sides. A modified method should be used in the analytical method.

The second embodiment for indicating this is a change in the driving method of the first embodiment, in which an image is determined by a timing controller, and a stereoscopic display device that performs stereoscopic image driving or flat image driving according to the determined image The case of receiving a stereoscopic image will be described as an example.

4 is a block diagram showing an algorithm for a method of driving a stereoscopic display device according to a first embodiment of the present invention.

As shown in FIG. 4, the stereoscopic display device performs driving according to the first to eighth steps S11 to S18 to determine a stereoscopic image and a flat image, and performs driving of the stereoscopic display device according to the determined result. Can.

In a first step (S11), the stereoscopic display device is driven according to a user's power signal input.

When a user inputs a power signal to view a stereoscopic image or a flat image, the stereoscopic display device drives the device according to the input power signal.

In this case, the power signal may be a switch directly connected to a stereoscopic display device or a means capable of communicating at a long distance, such as infrared communication.

In the second step (S12 ), image data applied from the outside is input to the timing controller.

The externally applied image data includes a 10-bit gradation value 1024 to be transmitted to each pixel to represent one frame, and the stereoscopic image data applied in this step is as mentioned above. For example, a left-eye image is recorded on the left side and a right-eye image is recorded on the right side.

In a third step (S13), image data for two vertical lines among the input image data is sampled.

The timing controller that receives the image data analyzes the gradation values for the image data corresponding to two vertical lines located adjacent to each other among the input image data.

At this time, the gradation values of the pixels sampled in each vertical line may be stored in a storage unit connected to the timing controller, and the storage unit may be formed inside or outside the timing controller.

In a fourth step (S4 ), an average value of the deviation of the image data of each of the left and right adjacent pixels among the two vertical lines is calculated.

The deviation of the image data of each of the left and right adjacent pixels analyzed in the third step S13 is calculated by the timing controller.

At this time, the reason for comparing the pixels adjacent to the left and right of the two vertical lines is to determine the continuity of the image, and in most flat images, the grayscale values of the pixels adjacent to the left and right are similarly measured in the two vertical lines located in the center. On the other hand, in the three-dimensional image, the grayscale value of each pixel adjacent to the left and right in the two vertical lines located in the center shows a difference of 30% or more.

In a fourth step (S14), the average value of the gradation value deviation of the left and right adjacent pixels located in the two vertical lines is calculated and stored.

At this time, the average value is for all of the gradation value deviations of the left and right adjacent pixels located on the two vertical lines, and this value may be stored in the storage unit.

In the fifth step (S15 ), if n frames of the input image data are judged to be n or more, the process proceeds to the next step. If n or less, the third and fourth steps (S13 and S14) are repeatedly performed.

This is to increase the accuracy of determining the type of image by repeatedly performing the same operation in determining the type of image data, and the third and fourth steps (S3, S4) are performed once for one frame (n= 1) Although it may be performed, the third and fourth steps S3 and S4 may be repeatedly performed for a plurality of frames.

However, if the third and fourth steps (S3, S4) are repeatedly performed on the image data, the time for outputting the image may be delayed. It is preferable to perform the four steps (S3, S4) repeatedly.

In the sixth step (S16), the average value of the deviations for n frames and the size of the stereoscopic image reference value are determined.

At this time, the reference value of the stereoscopic image determines the input image as a stereoscopic image when the average value of the deviation is greater than or equal to a predetermined value, performs step 7a (S17a), and determines the input image as a flat image when the average value of the deviation is equal to or less than the predetermined value. Step 7b (S7b) is performed.

On the other hand, the stereoscopic image reference value can be changed according to the setting. In the second embodiment of the present invention, 30% of the maximum gradation value, that is, 307 is shown, but this may be changed depending on the case.

In the seventh step (S7 ), when it is determined that the image data input in the sixth step (S6) relates to a stereoscopic image, the first driving (S7a) or the second driving (S7b) is performed according to the result value.

The first driving (S7a) is to output the image after rearranging the image data appropriately for the stereoscopic means by judging it as a stereoscopic image when the average value of the deviations for n frames in the sixth step S6 is greater than or equal to the stereoscopic image reference value. The second driving (S7b) is to maintain the arrangement of the image data by judging it as a flat image when the average value of the deviations for n frames in the sixth step (S6) is equal to or less than the stereoscopic image reference value.

At this time, the flat image represents an image in which a stereoscopic feeling is not felt when viewed, and may be rearranged such that the same image can be input to the left and right eyes by the stereoscopic means.

In the eighth step S8, image data is output.

The image data is output according to the driving selected in the seventh step (S7 ).

At this time, when the stereoscopic display device continuously receives image data and changes from a flat image to a stereoscopic image or from a stereoscopic image to a flat image, the second operation (S2) is repeated to perform the first driving (S7a) or the second. The drive S7b can be selected.

In the first to eighth steps (S1 to S8), the stereoscopic image and the flat image are determined using the average deviation value of the pixels adjacent to the left and right of the two vertical lines located at the center of the image, and the stereoscopic image is driven according to the determination result, or It simply shows the algorithm of a stereoscopic display device for driving a flat image.

A stereoscopic display device including a timing controller having such an algorithm performs first driving or second driving using a value measured by a timing controller, which will be described with reference to FIG. 5 below.

FIG. 5 is a table showing a mean value of a deviation between a 3D image input to a 3D display device according to a second embodiment of the present invention and right and left adjacent pixels of two vertical lines positioned at the center of the 3D image.

As illustrated in FIG. 5, in the stereoscopic display device according to the second embodiment of the present invention, a panel in which 1920 vertical pixel lines and 1080 horizontal pixel lines are arranged is taken as an example.

At this time, a 960 vertical pixel line is positioned at the boundary of the left-eye image, and a 961 vertical pixel line is positioned at the boundary of the right-eye image.

The first to 1080 pixels are formed in the 959 and 961 vertical pixel lines indicating the boundary between the left-eye and right-eye images, and the gradation values and their respective deviation values respectively represent the 960 vertical pixels in the table shown in FIG. 5. Line L, 961 vertical pixel line R, Δ|(LR)|.

The average value Δ|(LR)| for the gradation deviation of each pixel formed in the 960th vertical pixel line L and the 961th vertical pixel line R is about 385, but is not an artificially produced flat image. △|(LR)| is 30% of the maximum gradation value, that is, it is very rare to exceed 307, so it is determined that the input image is a stereoscopic image based on this, and the stereoscopic image is driven. It is rearranged according to the stereoscopic means of the stereoscopic display device and then output.

On the other hand, the average value Δ|(LR)| for the gradation deviation of each pixel formed in the 960th vertical pixel line L and the 950th vertical pixel line R is less than 30% of the maximum gradation value, that is, less than 307 In this case, the stereoscopic display device may determine that the input image is a flat image and perform flat image driving.

The above driving method of the stereoscopic display device automatically analyzes the input image to determine whether it is a stereoscopic image or a flat image, and performs a stereoscopic image driving or flat image driving according to the determination result of the image without changing a user's setting. It is possible to selectively express stereoscopic images and planar images.

In addition, since the above driving method can be applied without changing the structure of the stereoscopic display device, when using a network communication network, the above driving method can also be applied to a device to which the above driving method is not applied.

Although described above with reference to preferred embodiments of the present invention, those skilled in the art variously modify and change the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You can understand that you can.

L: Pixel line where the left eye image is output
R: Pixel line on which the right eye image is output
△|(LR)| : Mean deviation

Claims (12)

In the driving method of a stereoscopic display device equipped with a stereoscopic means,
A first step of receiving image data;
A second step of sampling a gradation value indicated by each pixel of the first and second horizontal pixel lines adjacent to each other located at a boundary where a first image output from the top of the image data and a second image output from the bottom are separated; ;
A third step of calculating a gradation deviation which is a difference between a gradation value of each pixel of the first horizontal pixel line and a gradation value of each pixel of the second horizontal pixel line, and calculating and storing an average value of the gradation deviations;
A fourth step of comparing the average value of the gradation deviations with a stereoscopic image reference value;
A fifth step of performing image driving according to the comparison result of the fourth step
Including,
The fifth step,
If the average value of the gradation deviations is greater than or equal to the reference value of the stereoscopic image, performing stereoscopic image driving;
If the average value of the gradation deviations is less than the stereoscopic image reference value, performing a planar image driving
Method of driving a three-dimensional display device comprising a.
According to claim 1,
The first image defines one surface of the stereoscopic display device divided into 1:1 as a boundary of the first image, and the second image defines the first image among the stereoscopic display device divided into 1:1. A method of driving a stereoscopic display device characterized in that the other side which is not defined is defined as a boundary of the second image.
delete According to claim 1,
The stereoscopic image reference value is 30% of the maximum gradation value of the image data.
According to claim 1,
Between the third and fourth steps,
A sixth step of comparing the number of times the average value of the gradation deviations is calculated with a reference number;
And a seventh step of repeating the second and third steps when the calculated number of times is less than the reference number of times.
In the driving method of a stereoscopic display device equipped with a stereoscopic means,
A first step of receiving image data;
A second step of sampling the gradation value indicated by each pixel of the first and second vertical pixel lines adjacent to each other located at a boundary where the first image output from the left side of the image data and the second image output from the right side are separated. Wow;
A third step of calculating a gradation deviation, which is a difference between a gradation value of each pixel of the first vertical pixel line and a gradation value of each pixel of the second vertical pixel line, and calculating and storing an average value of the gradation deviations;
A fourth step of comparing the average value of the gradation deviations with a stereoscopic image reference value;
A fifth step of performing image driving according to the comparison result of the fourth step
Including,
The fifth step,
If the average value of the gradation deviation is greater than or equal to the reference value of the stereoscopic image, performing stereoscopic image driving;
If the average value of the gradation deviations is less than the stereoscopic image reference value, performing a planar image driving
Method of driving a three-dimensional display device comprising a.
The method of claim 6,
The first image defines one surface of the stereoscopic display device divided into 1:1 as a boundary of the first image, and the second image defines the first image among the stereoscopic display device divided into 1:1. A method of driving a stereoscopic display device characterized in that the other side which is not defined is defined as a boundary of the second image.
delete The method of claim 6,
The stereoscopic image reference value is 30% of the maximum gradation value of the image data.
The method of claim 6,
A sixth step of comparing the number of calculations of the average value of the gradation deviations with the reference number between the third and fourth steps;
And a seventh step of repeating the second and third steps when the calculated number of times is less than the reference number of times.
According to claim 1,
The step of performing the stereoscopic image driving includes rearranging and outputting the image data suitably for the stereoscopic means,
The driving of the planar image may include maintaining and outputting the arrangement of the image data.
The method of claim 5,
The average value of the gradation deviation is an average value for n frames corresponding to the reference number of times.

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