WO2020073816A1 - 用于测量显示设备的畸变参数的方法、装置和测量设备以及计算机可读介质 - Google Patents
用于测量显示设备的畸变参数的方法、装置和测量设备以及计算机可读介质 Download PDFInfo
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Definitions
- the present disclosure relates to the field of display technology, and in particular, to a method, apparatus, measurement device, and computer-readable medium for measuring distortion parameters of a display device.
- the virtual reality device In order to let the user have a real sense of immersion, the virtual reality device must cover the visual range of the human eye as much as possible, which requires the installation of a A magnifying glass with a curvature, but when a traditional image is projected into a person's eyes through the magnifying glass, the image is distorted, so it is necessary to know the distortion parameters of the device.
- the present disclosure provides a method for measuring distortion parameters of a display device.
- the display device includes a display screen and a lens on a light emitting side of the display screen.
- the method includes:
- the initial image is an image displayed on the display screen, the initial image includes a plurality of first corner points, and the distortion image includes Multiple second corner points matching one corner point;
- the distortion parameter of the display device is determined according to the positional relationship between at least one second corner point of the plurality of second corner points and the first corner point matching the at least one second corner point.
- the distorted image is generated by shooting the initial image through the lens using a shooting unit, and the measurement method further includes:
- the distortion image is corrected according to the parameters of the shooting unit.
- Also before determining the distortion parameter of the display device according to the positional relationship between at least one second corner point of the plurality of second corner points and the first corner point matching the at least one second corner point ,Also includes:
- the first corner points are arranged in a first array
- the second corner points are arranged in a second array
- the measurement method further includes:
- a second corner point whose position in the second array is the same as the position of the first corner point in the first array is determined as the first corner point matching the first corner point Two corners.
- the determining the positions of the plurality of first corner points in the first array and the positions of the plurality of second corner points in the second array include:
- the attribute information of the points is different, and the attribute information includes at least one of the following: the corner color and the corner area;
- the initial image is a barrel image, including the plurality of first corner points arranged in the first array, the first reference corner point includes a central corner point, and the central corner point is located at For the first corner point in the center of the first array, the area of the center corner point is different from the area of the first corner point other than the center corner point.
- the determining at least one second corner point of the plurality of second corner points as the second reference corner point matching the first reference corner point according to the attribute information includes: The second corner point in the second array whose area is different from the area of the other second corner points is determined as the second reference corner point matching the central corner point in the first array.
- the first reference corner point further includes: a lateral corner point and a longitudinal corner point, the lateral corner point is a first corner point that goes along with the center corner point, and the longitudinal corner point is a corner angle with the center angle
- the lateral corner point has a first color
- the longitudinal corner point has a second color
- the first corner point other than the lateral corner point and the longitudinal corner point has a Three colors, the first color, the second color and the third color are different from each other.
- the determining at least one second corner point of the plurality of second corner points as the second reference corner point matching the first reference corner point according to the attribute information includes: The second corner point with the first color in the second array is determined as the second reference corner point matching the lateral corner point in the first array, and the second corner point with the second color in the second array is determined It is a second reference corner point that matches the longitudinal corner point in the first array.
- the judging whether the positions of the plurality of second corner points in the distorted image satisfy a preset condition includes:
- the measurement method further includes: if the position of at least one second corner point in the plurality of second corner points in the distorted image does not satisfy the preset condition, the adjustment and the position do not satisfy the The position of the first corner point in the initial image that matches the second corner point of the preset condition, and returns to the step of performing the process of acquiring the distorted image generated after the initial image passes through the lens until the distorted image The plurality of second corner points all satisfy the preset condition.
- An embodiment of the present disclosure also provides an apparatus for measuring distortion parameters of a display device, the display device including a display screen and a lens on a light-emitting side of the display screen, wherein the device includes:
- the image acquisition module is configured to acquire a distorted image generated after an initial image passes through the lens, the initial image is an image displayed on the display screen, the initial image includes a plurality of first corner points, and the distorted image includes Multiple second corner points that respectively match the multiple first corner points;
- the parameter determination module is configured to determine the position of the display device according to the positional relationship between at least one second corner point of the plurality of second corner points and the first corner point matching the at least one second corner point Distortion parameters.
- the distorted image is generated by the shooting unit shooting the initial image through the lens, and the measuring device further includes:
- the correction module is configured to correct the distorted image according to the parameters of the shooting unit.
- the first corner points are arranged in a first array
- the second corner points are arranged in a second array
- the measurement device further includes:
- the corner matching module is configured to determine the positions of the plurality of first corner points in the first array and the positions of the plurality of second corner points in the second array, and for each A corner point, a second corner point whose position in the second array is the same as the position of the first corner point in the first array is determined as a second corner point matching the first corner point.
- the corner matching module includes:
- a first reference corner point unit configured to determine at least one first corner point of the plurality of first corner points as a first reference corner point, and attribute information of the first reference corner point and the first
- the attribute information of the first corner point other than the reference corner point is different, and the attribute information includes at least one of the following: corner color and corner area;
- a second reference corner point unit configured to determine at least one second corner point of the plurality of second corner points as the second reference corner point matching the first reference corner point according to the attribute information ;as well as
- the position information determination unit is configured to determine the positions of the plurality of first corner points in the first array according to the positional relationship between the first reference corner point and other first corner points, and according to the Determining the positional relationship between the second reference corner point and other second corner points to determine the positions of the plurality of second corner points in the second array;
- the correspondence establishment unit is configured to determine, for each first corner point, a second corner point whose position in the second array is the same as that of the first corner point in the first array, as The first corner point matches the second corner point.
- the initial image is a barrel image, including the plurality of first corner points arranged in the first array, the first reference corner point includes a central corner point, and the central corner point is located at For the first corner point in the center of the first array, the area of the center corner point is different from the area of the first corner point other than the center corner point.
- the measurement device further includes: a corner determination module configured to determine whether the positions of the plurality of second corners in the distorted image satisfy preset conditions, and if so, trigger the parameter determination module Work, wherein the corner judgment module includes:
- a distance calculation unit unit configured to calculate the distance between the position of each second corner point in the distorted image and a preset reference position for the second corner point
- the preset condition determining unit is configured to determine that the second corner meets the preset condition when the distance is less than or equal to a preset threshold, and trigger the parameter determination module to work.
- the measurement device further includes:
- the corner adjustment module is configured to adjust and the position to not satisfy the condition that the position of at least one second corner of the plurality of second corners in the distorted image does not satisfy the preset condition
- the position of the first corner point in the initial image that matches the second corner point of the preset condition and triggers the image acquisition module to perform the step of acquiring the distorted image generated after the initial image passes the lens again, until The plurality of second corner points in the distorted image all satisfy the preset condition.
- An embodiment of the present disclosure also provides a measurement device for measuring distortion parameters of a display device.
- the display device includes a display screen and a lens on a light-emitting side of the display screen.
- the measurement device includes:
- a shooting unit located on the side of the lens facing away from the display screen, for shooting the initial image displayed on the display device via the lens to obtain a distorted image
- the controller is connected to the display screen of the display device and the shooting unit, and the controller is configured to perform the above method.
- Embodiments of the present disclosure also provide a computer-readable medium on which instructions are stored, which when executed by a processor cause the processor to perform the above method.
- FIG. 1 shows a flowchart of a distortion parameter measurement method provided by an embodiment of the present disclosure
- FIG. 2 shows a flowchart of a distortion parameter measurement method provided by another embodiment of the present disclosure
- FIG. 3 shows a flowchart of matching corner points according to an embodiment of the present disclosure
- FIG. 4 shows a schematic diagram of an initial image provided by an embodiment of the present disclosure
- FIG. 5A shows a schematic diagram of determining a corner position provided by an embodiment of the present disclosure
- FIG. 5B shows a flowchart of determining a corner position according to an embodiment of the present disclosure
- FIG. 6 shows a flowchart of determining whether a corner meets a preset condition provided by an embodiment of the present disclosure
- FIG. 7 shows a schematic diagram of a distribution of preset reference positions provided by an embodiment of the present disclosure
- FIG. 8 shows a structural block diagram of a distortion parameter measurement device provided by an embodiment of the present disclosure
- FIG. 9 shows a schematic structural diagram of a distortion parameter measurement system provided by an embodiment of the present disclosure.
- FIG. 10 shows a schematic diagram of the distance between the first corner point and the origin on the initial image provided by an embodiment of the present disclosure
- FIG. 11 shows a schematic diagram of a field angle corresponding to a second corner point on a distorted image provided by an embodiment of the present disclosure
- FIG. 13 shows a schematic diagram of a relative position between a second corner point and a preset reference point provided by an embodiment of the present disclosure.
- the distortion includes pincushion distortion, barrel distortion, etc.
- Pincushion distortion also known as pincushion distortion
- Barrel distortion also known as barrel distortion
- barrel distortion is a distortion phenomenon caused by the barrel expansion of the picture caused by the physical characteristics of the lens in the lens and the structure of the lens group.
- the theoretical distortion parameters are directly output through the corresponding software, and then manually fine-tuned from the application side. This method is time-consuming and labor-intensive, and the effect is not good.
- an embodiment of the present disclosure provides a distortion parameter measurement method for measuring a distortion parameter of a display device.
- the display device includes a display screen and a lens on a light emitting side of the display screen.
- the distortion parameter measurement method may include the following steps.
- Step 101 Obtain a distorted image generated after an initial image passes through a lens.
- the initial image may be an image displayed on a display screen.
- the initial image includes multiple first corner points, and the distorted image may include multiple matching first corner points. A second corner.
- the initial image may be a theoretical anti-distortion image pre-burned according to the theoretical distortion parameters of the lens or an image pre-designed by a person skilled in the art according to actual conditions.
- the initial image may be a barrel image
- the barrel image may be, for example, a barrel grid or a barrel corner array.
- the barrel-shaped corner point array may include a plurality of points arranged in a barrel shape, such as but not limited to a plurality of round points.
- the distortion image generated by the barrel image after passing through the lens tends to be “horizontal, horizontal, and vertical”. Therefore, by setting the initial image as a barrel grid or barrel corner array, the efficiency of distortion correction during the measurement process can be improved.
- Corner points are points on the image that have predetermined attributes, such as points representing corners or protruding parts.
- a person skilled in the art may define corner points according to the actual situation, for example, a point in the image whose attributes such as gray scale or color have reached a predetermined degree.
- the corner point of the initial image is called the first corner point
- the corner point of the distorted image is called the second corner point.
- the first corner point can be the intersection of the grid lines; when the initial image is a barrel corner array, the first corner
- the dots may be dots arranged in a barrel shape.
- the display screen displays the initial image
- the distorted image generated after the initial image passes through the lens can be collected by a camera (such as a wide-angle camera) and other shooting units.
- the first corner point on the initial image can be detected by gray-scale corner detection or contour curve-based corner detection.
- the contour of the first corner point on the initial image can be solved, and then the coordinates of the center point of the contour, that is, the position of the first corner point (such as pixel coordinates, etc.) can be fitted according to the contour.
- the distorted image includes a plurality of second corner points respectively corresponding to (ie matching) the plurality of first corner points, and the second corner points can also be detected by gray-based corner points or contour curve-based Detected by corner detection and other methods.
- the position of the second corner point can be obtained according to the image processing method, for example, the contour of the second corner point on the distorted image can be solved, and then the coordinates of the center point of the contour can be fitted according to the contour, ie the position of the second corner point (such as Coordinates, etc.).
- the positions of the first corner point and the second corner point may also be converted into position coordinates in the same coordinate system according to the respective pixel coordinates.
- the pixel coordinates of the first corner point can represent the arrangement position of the sub-pixels corresponding to the first corner point in the pixel array in the initial image
- the pixel coordinates of the second corner point can represent the sub-pixels corresponding to the second corner point
- the display device may be a virtual display device VR or the like.
- Step 102 Determine a distortion parameter of the display device according to a positional relationship between at least one second corner point of the plurality of second corner points and a first corner point matching the at least one second corner point.
- the distortion parameter of the display device may be determined through software simulation or data fitting based on the position of the second corner point that satisfies the preset condition and the corresponding first corner point. This will be described in further detail below.
- the distortion parameter measurement method provided in this embodiment determines the distortion parameter of the display device according to the second corner point on the first distortion image that satisfies the preset condition and the first corner point on the corresponding initial image.
- This method of distortion parameter measurement can eliminate the need for manual blind adjustment, making the measurement of distortion parameters more convenient, and this measurement method can accurately calculate the distortion parameters of multiple points on the display device, improve the measurement efficiency, and thus improve the distortion correction. Accuracy.
- obtaining the distorted image after the initial image passes through the lens may include, for example: obtaining a second distorted image after the initial image passes through the lens, and processing the obtained second distorted image to obtain a distorted image.
- the processing may include rotating the collected image to correct the angular deviation between the camera and the display screen; it may also include correction processing to eliminate distortion caused by the camera itself.
- FIG. 2 is a flowchart of a distortion parameter measurement method provided by another embodiment of the present disclosure.
- Step 201 Use a photographing unit (such as a camera) to photograph the initial image displayed on the display screen through the lens of the display device to obtain a distorted image.
- a photographing unit such as a camera
- the initial image may be set as the barrel image shown in FIG. 4.
- the distorted image is an image obtained after the initial image passes through the lens and the shooting unit, and is equivalent to the distortion caused by applying the lens and the lens of the shooting unit to the initial image.
- Step 202 Correct the distorted image according to the parameters of the shooting unit (for example, internal parameters) to obtain the corrected distorted image.
- the shooting unit may be a device with a shooting function, such as a camera or a wide-angle camera.
- the distortion image captured by the camera may be corrected according to the internal parameters of the camera to eliminate the distortion caused by the camera lens when capturing the image.
- the internal parameters of the shooting unit, such as the camera can be obtained by calibrating the camera, and the calibration method can use the Zhang Zhengyou method.
- the shooting unit can be operated under the control of the controller. In some embodiments, the shooting unit can also be operated manually.
- step 202 may be omitted, and the distorted image obtained in step S201 is used for subsequent operations, so that the processing speed may be increased.
- step 203 the first corner point and the second corner point are matched, that is, the correspondence between the first corner point and the second corner point is established.
- the correspondence between the first corner point and the second corner point may be determined according to the positions of the first corner point and the second corner point. For example, as shown in FIG. 4, the first corner points in the initial image are arranged in a first array, which causes the second corner points in the distorted image to be arranged in a second array accordingly.
- step 2031 the positions of the plurality of first corner points in the first array (for example, the array position represented by the number of rows and columns) and the plurality of second corner points in the second The position in the array (for example, the position of the array represented by the number of rows and columns), and in step 2032, for each first corner point, determine the position in the second array and the first corner point in the The second corner point at the same position in the first array serves as the second corner point matching the first corner point.
- step 204 it is determined whether the positions of the plurality of second corner points in the distorted image satisfy preset conditions, and if so, step 205 is performed, otherwise step 206 is performed.
- a distortion parameter of the display device is determined according to a positional relationship between at least one second corner point of the plurality of second corner points and a first corner point matching the at least one second corner point.
- the positions of the first corner point and the second corner point can be converted into position coordinates in the same plane coordinate system (the plane coordinate system is parallel to the plane of the initial image and the distorted image) according to the respective pixel coordinates, for example
- the origin of the coordinate system can be set at the position where the optical axis of the lens intersects the plane.
- the optical axis of the lens may be perpendicular to the above-mentioned plane. As shown in FIG.
- a point on the initial image also called a screen image
- the origin O a point on the initial image whose optical axis is perpendicular to the intersection of the initial image and the initial image
- the coordinates of the first corner point P are (x, y)
- the distance between the corner point P and the coordinate origin O is R.
- the distance R may be an Euclidean distance.
- O ′ represents the origin and Q represents the preset observation point (for example, the position of the human eye, in this embodiment, the position of the camera and other shooting units can be used as the preset observation point), P 'represents a second corner point that matches the first corner point P in the initial image.
- An angle FOV is formed, and the angle FOV is used as the angle of view of the second corner point P ′.
- the distance between the observation point Q and the origin O eg, the focal length of the camera
- the distance between the observation point Q and the origin O can be set to a fixed value.
- the distortion parameter can be obtained based on the distance R between the first corner point P and the origin O shown in FIG. 10 and the field angle FOV of the second corner point P 'matching the first corner point P shown in FIG. 11.
- the correspondence list between the distance R and the field of view FOV may be used as an expression of the distortion parameter.
- a correspondence curve between the distance R and the field of view FOV may be formed, and the coefficient of the curve may also be used as another expression of the distortion parameter.
- the above distortion parameter calculation is obtained based on the correspondence between the distance R and the field of view FOV.
- the correspondence between the components of the distance R and the field of view FOV on each coordinate axis of the above coordinate system may also be used.
- the relationship is obtained, such as the corresponding relationship list (Xp, Yp, FOVx, FOVy), where Xp and Yp are the components of the coordinates of the first corner point P on the two coordinate axes, and FOVx and FOVy are the field angle FOV on the two coordinate axes The weight on.
- step 206 adjust the position of the first corner point in the initial image that matches the second corner point whose position does not satisfy the preset condition, and return to step 201.
- the reference corner point of the initial image and the reference corner point of the distorted image may be determined first, and then the relative positional relationship between the reference corner point in the initial image and other first corner points, and the distorted image
- the relative positional relationship between the reference corner point and the other second corner points in determines the corresponding relationship between each first corner point and each second corner point.
- step 2032 may include the following steps.
- Step 301 Determine at least one first corner point among the plurality of first corner points as a first reference corner point, the attribute information of the first reference corner point and the first corner point other than the first reference corner point
- the attribute information is different, and the attribute information includes at least one of the following: corner color and corner area.
- the first reference corner point may include a central corner point 41, which is located in the barrel image (initial image)
- the first corner point of the center, the area of the center corner point 41 may be larger or smaller than the area of the first corner point other than the center corner point 41, the area of the center corner point 41 shown in FIG. 4 is larger than the other first corner points Area.
- the first reference corner point may further include: a lateral corner point 42 and a longitudinal corner point 43, the lateral corner point 42 is the same as the central corner point 41
- the first corner point and the longitudinal corner point 43 are the first corner points in the same row as the center corner point 41.
- the colors of the horizontal corner point 42, the longitudinal corner point 43, and the first corner point other than the lateral corner point 42 and the longitudinal corner point 43 are different.
- the color of the horizontal corner 42 may be blue (first color), the color of the vertical corner 43 may be red (second color), and the color of the other first corners may be green (third color). It should be noted that, in this embodiment, since the center corner point can be distinguished according to the size of the area, the color of the center corner point can be any color.
- center corner points shown in FIG. 4 are distinguished from other first corner points by area size, and in some embodiments, the center corner points may also be distinguished by corner color.
- horizontal corners and vertical corners are not limited to be distinguished by corner color, but can also be determined or distinguished by other attribute information such as area size.
- Step 302 Determine at least one second corner point among the plurality of second corner points as the second reference corner point matching the first reference corner point according to the attribute information.
- the second corner point with the largest area among the second corner points is determined to be the central corner point of the distorted image, and the initial image Corresponds to the center corner point of.
- the center corner point is the largest area in the initial image and using it as the first reference corner point
- the second reference point matching the first reference corner point can be obtained by looking for the second corner point with the largest area in the distorted image Corner points, so that the central corner point of the distorted image can be used as the second reference corner point.
- the first reference corner point further includes a horizontal corner point and a vertical corner point
- the second corner point matches the horizontal corner point and the vertical corner point in the initial image
- these second corner points can also be used as the second reference corner point of the distorted image, for example, the second reference node that matches the horizontal corner point in the initial image and the first reference point that matches the longitudinal corner point in the initial image Two reference corner points.
- Step 303 Determine the position of the first corner point in the first array according to the positional relationship between the first reference corner point and other first corner points (for example, the array position represented by the number of rows and columns, also called position Information); determine the position of the second corner point in the second array according to the positional relationship between the second reference corner point and other second corner points (also referred to as position information).
- step 2031 An example implementation of the above step 2031) will be described below with reference to FIGS. 5A and 5B, that is, how to determine the positions of the plurality of first corner points in the first array and the plurality of second corner points at The position in the second array.
- the position information of the center corner point of the initial image can be set to (0, 0), and then according to The position of each first corner point (such as pixel coordinates, etc.) determines the relative positional relationship between each first corner point and the central corner point.
- the position information of the first first corner point to the right of the center corner point can be (1, 0)
- the position information of the first first corner point below the center corner point can be (0, 1), and so on The position information of each first corner point can be determined.
- the position information of each second corner point can be determined, such as (1, 0), (0, 1), etc.
- the first reference corner point includes the central corner point, as well as the lateral corner point and the longitudinal corner point, and the central corner point has the largest area
- the lateral corner point is blue
- the longitudinal corner point is red
- the other corner points are green
- the area is first determined
- the largest first corner point is the central corner point of the initial image, and then the first corner points other than the central corner point are separated into three channels (red, blue, and green) according to the corner color.
- the position information of each first corner point can be solved according to the position of each first corner point (such as pixel coordinates), when the center corner point is used as the first reference point, the position distribution of each first corner point, as shown in FIG. 5A
- the numbers below the corner point indicate the position information of the first corner point (that is, the row and column where the first corner point is located).
- the solution process of the position information of the first corner point may be as follows.
- Step 501 The position information of all the first corner points may be included as an array element in the no_location array (none point in the array has no position information determined).
- Step 502 Set the central corner point as the initial HOME point (ie, the first reference corner point) position information to (0, 0). Find the first corner point closest to the HOME point in no_location. For example, you can search three times to find the first horizontal corner point (blue) to the right of the center corner point. Determine the location information as (1, 0) and save it to row Array; you can also find the first vertical corner point (red) below the center corner point, and determine the location information as (0, 1), save it to the col array; the third time you can find the green corner point below the center corner point, determine The location information is (1, 1), and the (1, 1) point is used as the new HOME point (HOME 'point shown in FIG. 5A). At the same time, the (0,0), (1,0), (0,1), and (1,1) points whose position information has been determined are deleted from the no_location array.
- the distance between the corner points may be the Euclidean distance calculated according to the positions of the corner points (such as pixel coordinates, etc.).
- Step 503 Traverse each first corner point in the row array, each first corner point in the col array, and the HOME point in turn to find the closest point.
- the first element in the row array is searched twice, the other elements are searched once, and they are updated to the row array in the order they are found;
- the first element in the col array is searched twice, and the other elements are searched once, in the order they are found Update to the col array in sequence; search for the HOME point once, and update the found point to the HOME point. And delete the found corners from the no_location array.
- the array serves as the first element in the row array (row'1 shown in Fig. 5A) and the second element (row'2).
- Step 504 Repeat step 503 until there are no corner points in the no_location array, that is, all corner points have determined position information.
- 5A shows a schematic diagram of determining position information by different corner points, where different arrows represent steps 503 of different loops, respectively.
- the process of determining the position information of the second corner point in the distorted image may be the same as the process of determining the position information of the first corner point, and details are not described herein again.
- step 204 An example implementation of the above step 204 will be described below with reference to FIG. 6, that is, how to determine whether the position of the second corner point in the distorted image satisfies the preset condition.
- the distortion degree of the distorted image is less than or equal to the specified value.
- the degree of distortion is used to characterize the degree of distortion of the distorted image.
- the degree of distortion of the distorted image is inversely proportional to the horizontal or vertical degree or straightness of the second corner points in the distorted image.
- the degree of distortion of the distorted image is less than or equal to the specified value, for example, by calculating the distance between the second corner point and the preset reference point is less than or equal to the preset distance, or by calculating any two second
- the angle between the connection point between the corner points and the preset reference line is less than or equal to the preset angle.
- the preset reference point, preset reference line, and specified value can be set by those skilled in the art according to the actual situation of the structure of the display device and user needs, etc. The specific value is not limited.
- an implementation manner for determining whether the position of the second corner point in the distorted image satisfies the preset condition is provided, and may include the following steps, for example.
- Step 601 Calculate the distance between the second corner point and the preset reference position for the second corner point.
- a corresponding reference position (also referred to as a reference point) may be set for each second corner point of the distorted image, that is, a position where each second corner point is expected to be located.
- the second corner points in the same row and same column in the distorted image are arranged in a straight line without distortion.
- a corresponding reference position can be set for each second corner point shown in FIG. 4, for example, for the first reference corner point (such as the center corner point, the lateral corner point and the The longitudinal corner points) and the other first corner points generate corresponding reference positions (also referred to as reference points), thereby obtaining the reference point array as shown in FIG. 7.
- the line between peer reference points in the reference point array is parallel to the line between horizontal reference points, and the distance between peer reference points is the same as the corresponding vertical reference point; the line between reference points in the same column is parallel The line between the vertical corner points, and the distance between the reference points in the same column is the same as the corresponding horizontal reference point.
- position information may also be determined for each reference point in the reference point array, and the reference point that is the same as the second corner point position information, that is, the reference point corresponding to the second corner point.
- the Euclidean distance between the second corner point 131 and the pixel coordinates of the reference position 130 for the second corner point 131 can be calculated.
- Step 602 When the distance between the second corner point and the preset reference position for the second corner point is less than or equal to a preset threshold, it is determined that the second corner point satisfies the preset condition.
- the threshold can be set to 4 pixel widths (or pixel pitches) and so on.
- the distance calculated in step 601 is less than or equal to 4 pixel widths, it may be determined that the second corner point satisfies the preset condition.
- the distance is greater than the preset threshold, it is determined that the second corner point does not satisfy the preset condition.
- the threshold for the distance can be determined by those skilled in the art according to actual conditions, and the disclosure is not limited.
- Steps 601 and 602 determine whether the second corner point on the distorted image is "horizontal, horizontal, and vertical" through an evaluation algorithm, that is, whether the preset condition is satisfied. In some embodiments, when the second corner points in the distorted image satisfy the preset condition through adjustment, that is, when the distorted image reaches the desired “horizontal, horizontal, and vertical” after adjustment, the distortion can be adjusted according to the final adjustment.
- the second corner point in the image and the first corner point in the initial image determine the distortion parameters of the display device.
- the deviation direction relative to the preset reference point can be determined first, and during the adjustment process, the corresponding first corner point can be Moving in a direction away from the deviation direction, you can move one pixel at a time, of course, you can also move any desired distance as needed.
- the corresponding first corner point can be moved downward Move one pixel distance; when the second corner point that does not satisfy the preset condition is located to the right of the preset reference point (that is, the abscissa of the second corner point is greater than the abscissa of the preset reference point), the corresponding A corner point moves one pixel to the left.
- step 206 After performing the adjustment in step 206, you can return to step 201 to repeat the steps of acquiring the image, corresponding corner points, and judging the corner points until the second corner points finally obtained meet the preset conditions, that is, each second corner on the distorted image
- the points are all “horizontal, horizontal and vertical”, and at this time, the first corner point on the initial image and the second corner point on the distorted image have a desired distortion correspondence. Therefore, as described above, according to all the second corner points that satisfy the preset condition (including the second corner point that initially satisfies the preset condition and the second corner point that satisfies the preset condition after adjusting the position of the first corner point) and the corresponding The position of the first corner point can determine the distortion parameter of the display device.
- the framing camera in the scene looks for the FOV1 corresponding to the image point according to the FOV2 of the framing camera, and then fits or calculates According to the distortion coefficient or the corresponding relationship obtained by the above method, determine the screen coordinates (x, y) corresponding to the field of view FOV1, and finally determine where on the screen each point in the scene needs to be displayed.
- SDK software development kit
- the coordinates of a fixed number of image plane points (second corner points) (also called image plane coordinates) and object plane points (first corner points) coordinates (also called object plane coordinates or screens) may be used Coordinates) (the image point and object point of which distortion parameters have been calculated), the screen coordinates corresponding to each image plane coordinate are determined by interpolation and fitting.
- FIG. 12 shows a schematic diagram of fitting screen coordinates corresponding to each image plane coordinate according to a distortion parameter of known image plane coordinates. As shown in FIG.
- the image plane point represented by the circle can be used
- the screen coordinates corresponding to the field of view FOV of 1, 2, 3, 4 are fitted to the screen coordinates corresponding to the field of view FOV at the image point represented by the triangle.
- An embodiment of the present disclosure provides a distortion parameter measurement device for measuring a distortion parameter of a display device.
- the display device includes a display screen and a lens on a light emitting side of the display screen.
- the measurement device may include an image acquisition module 801 And parameter determination module 806.
- the measurement device may further include a correction module 802.
- the measurement device may further include a corner matching module 803.
- the measurement device may further include a corner judgment module 804.
- the measurement device may further include a corner adjustment module 805.
- the image acquisition module 801 may be configured to acquire a distorted image after the initial image passes through the lens.
- the initial image is an image displayed on the display screen, the initial image includes a plurality of first corner points, and the distortion image includes a plurality of second corner points.
- the parameter determination module 806 may be configured to determine the distortion parameter of the display device according to the second corner point satisfying the preset condition and the corresponding first corner point.
- the image acquisition module 801 may be configured to receive a distorted image generated after the initial image captured by the shooting unit passes through the lens.
- the image acquisition module 801 may control a shooting unit such as a camera to shoot the initial image displayed on the display screen via a lens to obtain a distorted image, and receive the distorted image from the shooting unit.
- the correction module 802 may be configured to correct the distorted image according to the parameters (eg, internal parameters) of the shooting unit to obtain the corrected distorted image.
- the corner matching module 803 may be configured to establish a correspondence between the first corner and the second corner. For example, the corner matching module 803 may determine the positions of the plurality of first corner points in the first array and the positions of the plurality of second corner points in the second array, and for each first The corner point determines a second corner point whose position in the second array is the same as the position of the first corner point in the first array as a second corner point matching the first corner point.
- the corner matching module 803 may include a first reference corner unit 8031, a second reference corner unit 8032, a position information determination unit 8033, and a correspondence establishment unit 8024.
- the first reference corner point unit 8031 may be configured to determine a first reference corner point, the first reference corner point belongs to the first corner point, the attribute information of the first reference corner point and the first corner other than the first reference corner point
- the attribute information of points is different, and the attribute information includes at least one of the following: corner color and corner area.
- the second reference corner point unit 8032 may be configured to determine that the second corner point corresponding to the first reference corner point is the second reference corner point according to the attribute information.
- the position information determination unit 8033 may be configured to determine the position information of the first corner point according to the positional relationship between the first corner point and the first reference corner point; according to the position between the second corner point and the second reference corner point Relationship to determine the position information of the second corner point.
- the correspondence establishment unit 8034 may be configured to correspond to the first corner point and the second corner point having the same position information.
- the initial image may be a barrel image, including a plurality of first corner points arranged in an array, the first reference corner point may include a central corner point, and the central corner point is the first corner located at the center of the barrel image The area of the center corner point is different from the area of the first corner point other than the center corner point.
- the first reference corner point may also include: a horizontal corner point and a vertical corner point, the horizontal corner point is the first corner point that goes along with the central corner point, and the longitudinal corner point is the first corner point in the same row as the central corner point; , The color between the vertical corner point and the first corner point except the horizontal corner point and the vertical corner point are different.
- the corner judgment module 804 may be configured to judge whether the second corner meets a preset condition.
- the corner determination module 804 may include: a distance calculation unit 8041 configured to calculate the distance between the second corner point and the corresponding preset reference point; and a preset condition determination unit 8042 Is configured to determine that the second corner meets the preset condition when the distance is less than or equal to the preset threshold.
- the corner adjustment module 805 may be configured to, before the parameter determination module determines the distortion parameters of the display device according to the second corner that meets the preset condition and the corresponding first corner, the second corner that does not satisfy the preset condition The corresponding first corner point is adjusted so that the second corner point corresponding to the adjusted first corner point satisfies the preset condition.
- the parameter determination module 806 may be configured to determine the distortion parameter of the display device according to the second corner point satisfying the preset condition and the corresponding first corner point.
- the distortion parameter measurement device provided in this embodiment can implement various processes of the foregoing distortion parameter measurement method embodiments. To avoid repetition, details are not described herein again.
- the distortion parameter measurement device determines the distortion parameters of the display device according to the second corner point on the distortion image that satisfies the preset condition and the first corner point on the corresponding initial image through the parameter determination module, provided by this embodiment
- the measurement device can measure the distortion parameters without manual blind adjustment, which makes the measurement of the distortion parameters more convenient, and can accurately calculate the distortion parameters of multiple points on the display device, improve the measurement efficiency, and thus improve the accuracy of distortion correction.
- the distortion parameter measurement system may include a display device 901 and a measurement device for measuring the distortion parameter of the display device 901.
- the measurement device includes a shooting unit 902 such as a camera and a controller 903.
- the display device 901 includes a display screen 9011 and a lens 9012 on the light emitting side of the display screen 9011.
- the shooting unit 902 is located on the side of the lens 9012 facing away from the display screen 9011.
- the controller 903 is connected to the display screen 9011 of the display device 901 and the shooting unit 902, respectively.
- the controller 903 may be configured to perform the distortion parameter measurement method provided by any of the above embodiments.
- the controller 903 includes, but is not limited to, a PC computer, a laptop computer, a tablet computer, a notebook computer, a CPU, an application specific integrated circuit ASIC, a field programmable gate array FPGA, a micro control unit MCU, and so on.
- the display device 901 includes but is not limited to a VR device to be tested.
- the shooting unit 902 includes but is not limited to a camera and the like.
- a PC computer is connected to a VR device to be tested to control the display content of the VR device to be tested, and is connected to a camera to receive images captured by the camera.
- the content displayed by the VR device under test can be controlled by the controller 903, and the camera is used to capture the image displayed by the VR device under test and send it to the controller 903.
- the controller 903 controls the camera to capture the image displayed by the VR device under test and send it to the controller 903.
- An embodiment of the present disclosure also provides a computer-readable storage medium that stores a computer program (instruction) on the computer-readable storage medium, and when the computer program (instruction) is executed by a processor, causes the processor to perform the implementation of the present disclosure
- a computer program instruction
- the computer program instruction
- causes the processor to perform the implementation of the present disclosure The steps of any distortion parameter measurement method described in the example.
- Embodiments of the present disclosure provide a distortion parameter measurement method, device, measurement device, and computer-readable medium for measuring distortion parameters of a display device, the display device including a display screen and a lens on a light-emitting side of the display screen,
- the distortion parameter measurement method includes: obtaining a distortion image generated after an initial image passes through the lens, the initial image is an image displayed on the display screen, and the initial image includes a plurality of first corner points, the The distorted image includes a plurality of second corner points that respectively match the plurality of first corner points; and according to at least one second corner point and the at least one second corner point of the plurality of second corner points The positional relationship of the matched first corner points determines the distortion parameter of the display device.
- the technical solution provided in this embodiment can calculate the relationship between the second corner point (image plane point) that meets the preset condition and the corresponding first corner point (object plane point), by adjusting the first For corner points (object surface points), when the second corner points (image surface points) are all “horizontal and vertical”, the corresponding relationship and distortion parameters of the two are calculated. No manual blind adjustment is required during the measurement process, and the actual large-scale actual distortion parameters can be automatically calculated directly, which can greatly improve the efficiency of software development.
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Abstract
Description
Claims (20)
- 一种测量显示设备的畸变参数的方法,所述显示设备包括显示屏以及位于所述显示屏出光侧的透镜,所述方法包括:获取初始图像经过所述透镜后产生的畸变图像,所述初始图像为所述显示屏显示的图像,所述初始图像包括多个第一角点,所述畸变图像包括分别与所述多个第一角点匹配的多个第二角点;以及根据所述多个第二角点中的至少一个第二角点与跟所述至少一个第二角点匹配的第一角点的位置关系,确定所述显示设备的畸变参数。
- 根据权利要求1所述的方法,其中,所述畸变图像是通过使用拍摄单元经由所述透镜拍摄所述初始图像来产生的,所述测量方法还包括:根据所述拍摄单元的参数,对所述畸变图像进行校正。
- 根据权利要求1所述的方法,其中,在所述根据所述多个第二角点中的至少一个第二角点与跟所述至少一个第二角点匹配的第一角点的位置关系确定所述显示设备的畸变参数之前,还包括:判断所述畸变图像中的所述多个第二角点的位置是否满足预设条件,如果是,则执行所述根据所述多个第二角点中的至少一个第二角点与跟所述至少一个第二角点匹配的第一角点的位置关系确定所述显示设备的畸变参数的步骤。
- 根据权利要求1所述的方法,其中,所述第一角点排布成第一阵列,所述第二角点排布成第二阵列,所述测量方法还包括:确定所述多个第一角点在所述第一阵列中的位置以及所述多个第二角点在所述第二阵列中的位置;以及针对每个第一角点,确定在所述第二阵列中的位置与该第一角点在所述第一阵列中的位置相同的第二角点,作为与该第一角点匹配的第二角点。
- 根据权利要求4所述的方法,其中,所述确定所述多个第一角点在所述第一阵列中的位置以及所述多个第二角点在所述第二阵列中的位置包括:将所述多个第一角点中的至少一个第一角点确定为第一参考角点,所述第一参考角点的属性信息与除所述第一参考角点之外的第一角点的属性信息不同,所述属性信息包括以下至少一种:角点颜色和角点面积;根据所述属性信息,将所述多个第二角点中的至少一个第二角点确定为与所述第一参考角点匹配的第二参考角点;以及根据所述第一参考角点与其他第一角点之间的位置关系,确定所述多个第一角点在所述第一阵列中的位置,并根据所述第二参考角点与其他第二角点之间的位置关系,确定所述多个第二角点在所述第二阵列中的位置。
- 根据权利要求5所述的方法,其中,所述初始图像为桶形图像,包括排布成所述第一阵列的所述多个第一角点,所述第一参考角点包括中心角点,所述中心角点为位于所述第一阵列中心的第一角点,所述中心角点的面积与除所述中心角点之外的第一角点的面积不相同。
- 根据权利要求6所述的方法,其中,所述根据所述属性信息,将所述多个第二角点中的至少一个第二角点确定为与所述第一参考角点匹配的第二参考角点包括:将所述第二阵列中面积与其他第二角点的面积不相同的第二角点确定为与所述第一阵列中的中心角点匹配的第二参考角点。
- 根据权利要求6所述的方法,其中,所述第一参考角点还包括:横向角点和纵向角点,所述横向角点为与所述中心角点同行的第一角点,所述纵向角点为与所述中心角点同列的第一角点,所述横向角点具有第一颜色,所述纵向角点具有第二颜色,并且除所述横向角点和所述纵向角点之外的第一角点具有第三颜色,所述第一颜色、第二颜色和第三颜色互不相同。
- 根据权利要求8所述的方法,其中,所述根据所述属性信息,将所述多个第二角点中的至少一个第二角点确定为与所述第一参考角点匹配的第二参考角点包括:将所述第二阵列中具有第一颜色的第二角点确定为与所述第一阵列中的横向角点匹配的第二参考角点,将所述第二阵列中具有第二颜色的第二角点确定为与所述第一阵列中的纵向角点匹配的第二参考角点。
- 根据权利要求3所述的方法,其中,所述判断所述畸变图像中的所述多个第二角点的位置是否满足预设条件包括:计算所述畸变图像中每个第二角点的位置与针对所述第二角点的预设参考位置之间的距离;以及当所述距离小于或等于预设阈值时,判定所述第二角点满足所述预设条件。
- 根据权利要求3所述的方法,其中,所述测量方法还包括:如果所述畸变图像中的所述多个第二角点中的至少一个第二角点的位置不满足所述预设条件,则调整与位置不满足所述预设条件的第二角点相匹配的第一角点在所述初始图像中的位置,并返回执行所述获取初始图像经过所述透镜后产生的畸变图像的步骤,直到所述畸变 图像中的所述多个第二角点均满足所述预设条件。
- 一种用于测量显示设备的畸变参数的装置,所述显示设备包括显示屏以及位于所述显示屏出光侧的透镜,其中,所述装置包括:图像获取模块,被配置为获取初始图像经过所述透镜后产生的畸变图像,所述初始图像为所述显示屏显示的图像,所述初始图像包括多个第一角点,所述畸变图像包括分别与所述多个第一角点匹配的多个第二角点;参数确定模块,被配置为根据所述多个第二角点中的至少一个第二角点与跟所述至少一个第二角点匹配的第一角点的位置关系,确定所述显示设备的畸变参数。
- 根据权利要求12所述的装置,其中,所述畸变图像是通过拍摄单元经由所述透镜拍摄所述初始图像来产生的,所述测量装置还包括:矫正模块,被配置为根据所述拍摄单元的参数,对所述畸变图像进行校正。
- 根据权利要求12所述的装置,其中,所述第一角点排布成第一阵列,所述第二角点排布成第二阵列,所述测量装置还包括:角点匹配模块,被配置为确定所述多个第一角点在所述第一阵列中的位置以及所述多个第二角点在所述第二阵列中的位置,并针对每个第一角点,确定在所述第二阵列中的位置与该第一角点在所述第一阵列中的位置相同的第二角点,作为与该第一角点匹配的第二角点。
- 根据权利要求14所述的装置,其中,所述角点匹配模块包括:第一参考角点单元,被配置为将所述多个第一角点中的至少一个第一角点确定为第一参考角点,所述第一参考角点的属性信息与除所述第一参考角点之外的第一角点的属性信息不同,所述属性信息包括以下至少一种:角点颜色和角点面积;第二参考角点单元,被配置为根据所述属性信息,将所述多个第二角点中的至少一个第二角点确定为与所述第一参考角点匹配的第二参考角点;以及位置信息确定单元,被配置为根据所述第一参考角点与其他第一角点之间的位置关系,确定所述多个第一角点在所述第一阵列中的位置,并根据所述第二参考角点与其他第二角点之间的位置关系,确定所述多个第二角点在所述第二阵列中的位置;以及对应关系建立单元,被配置为针对每个第一角点,确定在所述第二阵列中的位置与该第一角点在所述第一阵列中的位置相同的第二角点,作为与该第一角点匹配的第二角点。
- 根据权利要求15所述的装置,其中,所述初始图像为桶形图像,包括排布成所述第一阵列的所述多个第一角点,所述第一参考角点包括中心角点,所述中心角点为位于所述第一阵列中心的第一角点,所述中心角点的面积与除所述中心角点之外的第一角点的面积不相同。
- 根据权利要求12所述的装置,其中,所述测量装置还包括:角点判断模块,被配置为判断所述畸变图像中的所述多个第二角点的位置是否满足预设条件,如果是,则触发所述参数确定模块工作,其中所述角点判断模块包括:距离计算单元单元,被配置为计算所述畸变图像中每个第二角点的位置与针对所述第二角点的预设参考位置之间的距离;以及预设条件判定单元,被配置为当所述距离小于或等于预设阈值时,判定所述第二角点满足所述预设条件,并触发所述参数确定模块工作。
- 根据权利要求17所述的装置,其中,所述测量装置还包括:角点调整模块,被配置为在所述畸变图像中的所述多个第二角点中的至少一个第二角点的位置不满足所述预设条件的情况下,调整与位置不满足所述预设条件的第二角点相匹配的第一角点在所述初始图像中的位置,并触发图像获取模块再次执行所述获取初始图像经过所述透镜后产生的畸变图像的步骤,直到所述畸变图像中的所述多个第二角点均满足所述预设条件。
- 一种用于测量显示设备的畸变参数的测量设备,所述显示设备包括显示屏以及位于所述显示屏出光侧的透镜,所述测量设备包括:拍摄单元,位于所述透镜背离所述显示屏的一侧,用于经由所述透镜来拍摄所述显示设备上显示的初始图像,以得到畸变图像;以及控制器,与所述显示设备的显示屏以及所述拍摄单元连接,所述控制器被配置为执行根据权利要求1至11中任一项权利要求所述的方法。
- 一种计算机可读介质,其上存储有指令,所述指令在由处理器执行时使所述处理器执行根据权利要求1至11中任一项权利要求所述的方法。
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