WO2016101643A1 - 一种仪表数据读取方法及系统 - Google Patents
一种仪表数据读取方法及系统 Download PDFInfo
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- WO2016101643A1 WO2016101643A1 PCT/CN2015/087870 CN2015087870W WO2016101643A1 WO 2016101643 A1 WO2016101643 A1 WO 2016101643A1 CN 2015087870 W CN2015087870 W CN 2015087870W WO 2016101643 A1 WO2016101643 A1 WO 2016101643A1
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- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000004364 calculation method Methods 0.000 claims abstract description 17
- 238000001514 detection method Methods 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
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- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T3/00—Geometric image transformations in the plane of the image
- G06T3/60—Rotation of whole images or parts thereof
- G06T3/602—Rotation of whole images or parts thereof by block rotation, e.g. by recursive reversal or rotation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F18/00—Pattern recognition
- G06F18/20—Analysing
- G06F18/21—Design or setup of recognition systems or techniques; Extraction of features in feature space; Blind source separation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/70—Determining position or orientation of objects or cameras
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/20—Special algorithmic details
- G06T2207/20048—Transform domain processing
- G06T2207/20061—Hough transform
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V2201/00—Indexing scheme relating to image or video recognition or understanding
- G06V2201/02—Recognising information on displays, dials, clocks
Definitions
- the present invention mainly relates to the field of data reading technology, and more particularly to a method and system for reading meter data.
- the commonly used instrument data reading method has a data reading method based on Hough transform and a reading method based on a straight line of a fitting pointer.
- the former measures the angle between the straight line of the pointer and the zero-scale straight line. Calculate the meter readings.
- the meter data obtained by this method is more accurate, at that time, when the quality of the acquired meter image is degraded, it will not be able to obtain a continuous pointer line feature, and the resulting detection result is not good; the latter is the selection pointer.
- the present invention provides a method and system for reading meter data, which solves the problem that the existing data reading method based on Hough transform can only be applied to a scene with high image quality of the instrument, and the reading based on the straight line of the fitting pointer.
- the technical problem of low accuracy of instrument data obtained by the method.
- a method for reading meter data characterized in that the method comprises:
- the current meter data of the meter to be read is calculated by using the correspondence between the pre-stored meter pointer and the angle between the position to be calculated and the meter scale.
- controlling the current data image to rotate according to the first direction is specifically:
- the position to be calculated is a horizontal position.
- the first calculation formula is:
- w represents the width of the current data image
- ⁇ I represents the angle between the meter pointer and the horizontal direction
- ⁇ A represents the first rotation angle
- the correspondence relationship ( ⁇ I ) between the angle between the meter pointer and the position to be calculated and the meter scale is specifically:
- I max represents the maximum scale of the meter to be read
- ⁇ max represents the meter pointer angle of the corresponding position of the maximum scale of the meter to be read
- I min represents the minimum scale of the meter to be read
- ⁇ min represents The minimum scale of the meter to be read corresponds to the meter pointer angle of the position.
- a two-dimensional coordinate system is established, and the center of the acquired current data image of the instrument to be read is aligned with the origin of the two-dimensional coordinate system.
- An instrument data reading system comprising:
- a rotation control device configured to control the current data image to rotate in a first direction, and acquire a current projection value of the meter pointer in the vertical direction in the current data image
- Selecting means for selecting a maximum projection value from all acquired current projection values, and determining a position when the meter pointer has a maximum projection value in a vertical direction is a position to be calculated;
- a first calculating means configured to calculate a first rotation angle required to rotate when the meter pointer is rotated to the position to be calculated according to the first direction
- a second calculating device configured to substitute the first rotation angle into a pre-stored first calculation formula, and calculate a first angle between the meter pointer and the to-be-calculated position
- a third calculating device configured to calculate current meter data with the reading meter by using a correspondence between the pre-stored meter pointer and the angle between the position to be calculated and the meter scale.
- the rotation control device comprises:
- the control module is rotated counterclockwise for controlling the current data image to rotate counterclockwise.
- the system further comprises:
- the coordinate system establishing means is configured to establish a two-dimensional coordinate system, and align the center of the acquired current data image of the instrument to be read with the origin of the two-dimensional coordinate system.
- the system further comprises:
- the voice broadcast device is configured to perform voice broadcast on the current meter data calculated by the third computing device.
- the present application provides a meter data reading method, after acquiring a current data image of the meter to be read, by controlling the current data image to rotate in a first direction, and acquiring The current projection value of the meter pointer in the vertical direction in the current data image, after which the maximum projection value is selected from the obtained projection values, and the position of the corresponding meter pointer is determined as the position to be calculated, and the meter pointer rotation is calculated.
- the first rotation angle is substituted into the pre-stored first calculation formula, and the first angle between the meter pointer and the position to be calculated is calculated.
- the present invention calculates the angle between the pointer of the instrument and the horizontal direction based on the characteristics of the fine tail of the meter indicating head, thereby calculating the instrument data, ensuring the accuracy of the obtained data, and avoiding the calculation of the straight line direction and the actual by the Hough transform. The deviation between the direction of the meter pointer and the influence on the meter reading.
- FIG. 1 is a schematic flow chart of an embodiment of a method for reading meter data according to the present invention
- FIG. 2 is a schematic structural view of an embodiment of a meter data reading system according to the present invention.
- Han Jiale et al. proposed a data reading method based on improved Hough transform instrument. Firstly, an adaptive median filtering algorithm is used to obtain a binary image, and then Using the improved Hough variation to extract the linear angle reading of the pointer; Fang Hua et al. proposed a substation instrumentation reading recognition algorithm suitable for the outdoor working environment of the intelligent substation inspection robot, which adopts the Scale Invariant Feature Transform (SIFT) algorithm. Extract the dashboard dial area, then binarize and backbone the dial area, and extract the linear angle reading of the pointer through Hough transform; Xiao et al.
- SIFT Scale Invariant Feature Transform
- the pointer line may not be a continuous line, and multiple lines are detected in the Hough transform;
- Sun Fengjie et al. propose an improved pointer angle recognition algorithm-concentric ring search method, select The center and radius of the area where the pointer is located, and then find the intersection of the pointer and the concentric circle in a concentric circle according to a certain step size, and identify the angle of the pointer relative to the zero-degree reference line according to the slope of the line segment formed between the intersection points.
- the recognition accuracy is lower than that of the Hough transform method, but it has strong adaptability in practical engineering applications.
- the applicant has classified the above-mentioned various image feature-based meter reading methods into two categories: one based on the Hough transform method and the other based on the method of fitting the pointer line.
- the meter reading based on the Hough transform method is more accurate, but when the image quality of the meter is degraded and continuous pointer line features cannot be obtained, the method has poor detection results.
- the method based on the fitting straight line has low detection accuracy and cannot meet the actual needs.
- the present application provides a meter data reading method, after acquiring the current data image of the meter to be read, by controlling the current data image to rotate in the first direction, and Obtain a current projection value of the meter pointer in the vertical direction in the current data image, and then select a maximum projection value from the obtained projection values, and determine a position of the corresponding meter pointer as a position to be calculated, and calculate a meter pointer
- the first rotation angle is substituted into the pre-stored first calculation formula, and the first angle between the meter pointer and the to-be-calculated position is calculated, and then The first angle is substituted into the correspondence between the pre-stored meter pointer and the angle between the position to be calculated and the meter scale, and the current meter data of the meter to be read is calculated.
- the present invention calculates the angle between the pointer of the instrument and the horizontal direction based on the characteristics of the fine tail of the meter indicating head, thereby calculating the instrument data, ensuring the accuracy of the obtained data, and avoiding the calculation of the straight line direction and the actual by the Hough transform.
- FIG. 1 a schematic flowchart of an embodiment of a meter data reading method according to the present invention, the method may specifically include the following steps:
- Step S11 Acquire a current data image of the meter to be read.
- Step S12 Control the current data image to rotate according to the first direction, and obtain a current projection value of the meter pointer in the vertical direction in the current data image.
- control of the current data image may be performed in a clockwise or counterclockwise manner, which is not specifically limited in the present invention.
- a two-dimensional coordinate system that is, an XY coordinate system
- the center of the current data image of the acquired instrument to be read and the two-dimensional coordinate system may be established.
- the origin is aligned.
- Step S13 selecting a maximum projection value from all the acquired current projection values, and determining a position when the meter pointer has a maximum projection value in the vertical direction is a position to be calculated.
- step S23 The position to be calculated in the middle can be the horizontal position of the meter pointer, that is, the position of the X axis.
- Step S14 Calculate a first rotation angle that needs to be rotated when the meter pointer is rotated to the position to be calculated according to the first direction.
- Step S15 Substituting the first rotation angle into the pre-stored first calculation formula, and calculating a first angle between the meter pointer and the to-be-calculated position.
- the first calculation formula may specifically be:
- w represents the width of the current data image
- ⁇ I represents the angle between the meter pointer and the horizontal direction
- ⁇ A represents the first rotation angle
- the present invention can judge the direction of the pointer based on the obtained projection value.
- Step S16 Calculate the current meter data of the meter to be read by using the correspondence between the pre-stored meter pointer and the angle between the position to be calculated and the meter scale.
- the correspondence relationship ( ⁇ I ) between the angle between the meter pointer and the position to be calculated and the meter scale is specifically:
- I max represents the maximum scale of the meter to be read
- ⁇ max represents the meter pointer angle of the corresponding position of the maximum scale of the meter to be read
- I min represents the minimum scale of the meter to be read
- ⁇ min represents The minimum scale of the meter to be read corresponds to the meter pointer angle of the position.
- the invention is based on the characteristics of the fine head and tail of the meter indicating head, calculates the angle between the pointer of the meter and the horizontal direction, and then calculates the meter data, which not only ensures the accuracy of the obtained data, but also avoids calculating the straight line direction by Hough transform. The deviation from the actual meter pointer direction, the impact on the meter reading.
- FIG. 2 a schematic structural diagram of an embodiment of an instrument data reading system of the present invention, the system may include:
- the acquiring device 21 is configured to acquire a current data image of the meter to be read
- the rotation control device 22 is configured to control the current data image to rotate in a first direction, and acquire a current projection value of the meter pointer in the vertical direction in the current data image.
- the rotation control device 22 can include:
- the control module is rotated counterclockwise for controlling the current data image to rotate counterclockwise.
- a selecting device 23 configured to select a maximum projection value from all acquired current projection values, and determine a position when the meter pointer has a maximum projection value in a vertical direction is a position to be calculated;
- a first calculating device 24 configured to calculate a first rotation angle that is required to be rotated when the meter pointer is rotated to the to-be-calculated position according to the first direction;
- the second calculating device 25 is configured to substitute the first rotation angle into the pre-stored first calculation formula, and calculate a first angle between the meter pointer and the to-be-calculated position.
- the first calculation formula may specifically be:
- w represents the width of the current data image
- ⁇ I represents the angle between the meter pointer and the horizontal direction
- ⁇ A represents the first rotation angle
- the third calculating device 26 is configured to calculate the current meter data with the reading meter by using the correspondence between the pre-stored meter pointer and the angle between the position to be calculated and the meter scale.
- I max represents the maximum scale of the meter to be read
- ⁇ max represents the meter pointer angle of the corresponding position of the maximum scale of the meter to be read
- I min represents the minimum scale of the meter to be read
- ⁇ min represents The minimum scale of the meter to be read corresponds to the meter pointer angle of the position.
- the meter data reading system may further include:
- the coordinate system establishing means is configured to establish a two-dimensional coordinate system, and align the center of the acquired current data image of the instrument to be read with the origin of the two-dimensional coordinate system.
- the voice broadcast device is configured to perform voice broadcast on the current meter data calculated by the third computing device, which is more convenient without the user viewing the display result.
- the embodiment of the present invention rotates the current data image according to the first direction, and acquires the current projection of the meter pointer in the vertical direction in the current data image.
- the maximum projection value is selected from the obtained projection values, and the position of the corresponding meter pointer is determined as the position to be calculated, and after calculating the first rotation angle that needs to be rotated when the meter pointer is rotated to the position to be calculated.
- the first rotation angle is calculated into the pre-stored first calculation formula, calculating a first angle between the meter pointer and the to-be-calculated position, and then substituting the first angle into the pre-stored meter pointer and the to-be-calculated
- the current meter data of the meter to be read is calculated.
- the present invention calculates the angle between the pointer of the instrument and the horizontal direction based on the characteristics of the fine tail of the meter indicating head, thereby calculating the instrument data, ensuring the accuracy of the obtained data, and avoiding the calculation of the straight line direction and the actual by the Hough transform.
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Abstract
Description
Claims (10)
- 一种仪表数据读取方法,其特征在于,所述方法包括:获取待读取仪表的当前数据图像;控制所述当前数据图像按照第一方向旋转,获取所述当前数据图像中仪表指针在垂直方向上的当前投影值;从所获取的所有当前投影值中选择出最大投影值,并确定所述仪表指针在垂直方向上具有最大投影值时的位置为待计算位置;计算所述仪表指针按照所述第一方向旋转至所述待计算位置时所需要旋转的第一旋转角;将所述第一旋转角代入预存的第一计算公式,计算所述仪表指针与所述待计算位置的第一夹角;利用预存的仪表指针与所述待计算位置的夹角和仪表刻度之间的对应关系,计算待读取仪表的当前仪表数据。
- 根据权利要求1所述的方法,其特征在于,所述控制所述当前数据图像按照第一方向旋转具体为:控制所述当前数据图像按照顺时针或逆时针旋转。
- 根据权利要求2所述的方法,其特征在于,所述待计算位置为水平位置。
- 根据权利要求1‐5任一项所述的方法,其特征在于,在所述控制所述当前数据图像按照第一方向旋转之前,所述还包括:建立二维坐标系,并将所述获取的待读取仪表的当前数据图像的中心与所述二维坐标系的原点对齐。
- 一种仪表数据读取系统,其特征在于,所述系统包括:获取装置,用于获取待读取仪表的当前数据图像;旋转控制装置,用于控制所述当前数据图像按照第一方向旋转,获取所述当前数据图像中仪表指针在垂直方向上的当前投影值;选择装置,用于从所获取的所有当前投影值中选择出最大投影值,并确定所述仪表指针在垂直方向上具有最大投影值时的位置为待计算位置;第一计算装置,用于计算所述仪表指针按照所述第一方向旋转至所述待计算位置时所需要旋转的第一旋转角;第二计算装置,用于将所述第一旋转角代入预存的第一计算公式,计算所述仪表指针与所述待计算位置的第一夹角;第三计算装置,用于利用预存的仪表指针与所述待计算位置的夹角和仪表刻度之间的对应关系,计算带读取仪表的当前仪表数据。
- 根据权利要求7所述的系统,其特征在于,所述旋转控制装置包括:顺时针旋转控制模块,用于控制所述当前数据图像按照顺时针旋转;逆时针旋转控制模块,用于控制所述当前数据图像按照逆时针旋转。
- 根据权利要求8所述的系统,其特征在于,所述系统还包括:坐标系建立装置,用于建立二维坐标系,并将所述获取的待读取仪表的当前数据图像的中心与所述二维坐标系的原点对齐。
- 根据权利要求7‐9任一项所述的系统,其特征在于,所述系统还包括:语音播报装置,用于对所述第三计算装置计算出的当前仪表数据进行语音播报。
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