JP2022101822A - Imaging measurement method and device for wood cut end face diameter - Google Patents

Abstract

To provide an imaging measurement method and device for measuring and imaging a diameter of a wood which is trimmed at a trimming site, converting a diameter class display for storing and using the same as measurement data.SOLUTION: An imaging measurement device comprises: a camera for imaging one by one, a cut circular end face of a cut wood; an imaging processing unit for eliminating a defect part from the imaged image for determining a circular shape; a calculation unit for determining a centroid from the imaged image, for determining a minimum value of the circular shape whose center is the centroid; an arithmetic unit for associating two radiation units for light spot display being a measurement reference in image processing, for determining an actual measurement value by relative comparison with the minimum value in which a distance between the two light spots is reference; an arithmetic unit for calculating a diameter class value from the minimum value of the imaged image; a storage unit for recording the number of counted wood for every diameter class and a display value; and a display unit for displaying a calculation result of the diameter class.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method and apparatus for imaging and measuring the diameter of a cut end face of wood, which can image and measure the diameter of wood cut at a logging site, convert the diameter classification display, and store and use it as measurement data.

At the forestry logging site, cut wood one by one, measure the minimum value when viewed from the circular end face with a winding scale, etc., and measure in 1 cm increments for 14 cm or less, for example, in the diameter class of "9 cm" for 9 cm to 9.9 cm. For those over 14 cm, in 2 cm increments, for example, 14 cm to 15.9 cm is a diameter class of "14 cm", and the measurement data is recorded on the recording paper and directly entered on the cut circular end face of the measured wood.
For the measurement data, the number of pieces and the calculated value (volume) aggregated for each diameter class are recorded on the delivery note designated by each company, and the timber and the delivery note are delivered to the customer as a set.
The customer collates the actual wood with the measurement data on the delivery note, sorts and stores the actual wood for each diameter class, and gives work instructions for each diameter class.

Conventionally, a processor device used for cutting out timber resources in a forest and mechanizing the logging and tree-building work of timber as a timber product, and a method for logging and felling wood using such a processor device are known. (See Patent Document 1).
This known technique is a processor device equipped on a work vehicle equipped with a movable arm, which holds felled wood and cuts it by a predetermined length, and has a main body portion arranged at the tip of the movable arm. A grip portion that is arranged in the main body portion and grips the wood, a feed portion that feeds the wood gripped by the grip portion in the length direction, a cutting portion that cuts the wood at an adjacent end of the feed portion, and the above. An image pickup device that captures images of the wood gripped by the grip portion extending from the grip portion along the center line of the grip portion in a direction away from the portion adjacent to the grip portion along the axial direction of the wood. It is provided with a display device arranged in the work vehicle and receiving and displaying image pickup information of wood sent from the image pickup device, and an information transmission means for transmitting the image pickup information from the image pickup device to the display device.

As described above, the processor device for logging and logging of wood can inspect defective parts of wood based on the information captured by the image pickup device from another direction in addition to the visual observation of the operator. It is possible to obtain a wood product with high commercial value by surely cutting out only the good part of the wood without defects.
On the other hand, in the present invention, the diameter of the timber felled at the logging site is imaged and measured, and the number of timber and the calculated value recorded in the delivery note specified by each company are recorded, and the timber and the delivery note are given to the customer. It is a post-process work that can be passed as a set.

Japanese Unexamined Patent Application Publication No. 2003-193096

In the present invention, the diameter of wood felled at a logging site is accurately imaged and measured except for a portion not used for diameter measurement (hereinafter referred to as "defective portion"), and the diameter class display is converted into measurement data. It is an object of the present invention to provide a method and an apparatus for imaging and measuring the diameter of a logging end face of wood that can be preserved and utilized.

In the imaging measurement method of the diameter of the cut end face of wood of the present invention, a cross section of the felled wood is photographed one by one with a camera, defective portions are removed by image processing, a virtual contour is set in the captured image, and a circular shape is determined. Processing is performed, the center of gravity is obtained from the image-processed circular shape, the minimum value of the circular shape centered on the center of gravity is obtained, the diameter class value is calculated from the minimum value of the captured image, and each measured value and each diameter class. The number and display value aggregated in are recorded.

The image pickup measuring device for the diameter of the cut end face of wood of the present invention includes a camera that captures a circular end face by cutting the felled wood one by one, an image processing device that removes a defective portion from the captured image and determines a circular shape, and the above. A calculation device that obtains the center of gravity from the captured image and the minimum value of the circular shape centered on the center of gravity, and an irradiation device that displays two light spots that serve as measurement criteria in image processing are attached, and the distance between the two light spots is determined. A calculation device that calculates the measured value by relative comparison with the reference minimum value, a calculation device that calculates the diameter class value from the minimum value of the captured image, and a storage device that records the total number and display value for each diameter class. And a display device for displaying the calculation result of the diameter class.

The method and apparatus for imaging and measuring the diameter of the cut end face of wood of the present invention can measure accurately with a small difference from the measured value only by photographing the diameter of the cut end face of wood, can sort the diameter class, and the customer can collect the aggregated data. It can be saved and used.

It is a work flow figure of the image pickup measuring apparatus of the wood cut end face diameter of this invention.

An embodiment of the image pickup measuring device for the diameter of the cut end face of wood of the present invention will be described below.
The image pickup measuring device for the diameter of the cut end face of wood includes a camera that cuts the felled wood one by one and photographs a circular end face, an image processing device that determines a circular shape from an image captured by the camera, and a center of gravity from the captured image. A calculation device that obtains the minimum value of a circular shape centered on the center of gravity, at least one pair of irradiation devices that irradiate light as a measurement reference in image processing, and a minimum value based on the distance between two light spots. A calculation device that calculates the diameter class value from the minimum value of the captured image, a storage device that records the total number and calculated value for each diameter class, and the calculation result of the diameter class. It is equipped with a display device that displays.

The camera is a handy type portable shooting device, which can be substituted with the camera function of a mobile phone, and has a data processing function and a data transmission function internally.
Calculation of cutting circular end of wood from a certain distance away, converting the image into actual measurement value inside the shooting device, uploading it to the cloud server as appropriate, and converting the diameter of the personal computer etc. at the remote point Download the data to the device.

The image processing device performs image processing for determining a circular shape from the contour of the captured image captured by the camera.
The calculation device obtains the center of gravity from the circular shape image-processed by the image processing device, and obtains the minimum value of the circular shape centered on the center of gravity.
The irradiation device is provided with at least one pair that irradiates light that serves as a measurement reference in image processing.

The arithmetic unit obtains an actually measured value by relative comparison with a minimum value based on a distance between two optical spots, and calculates a diameter class value from the minimum value of the captured image.
The storage device records the number and the calculated value obtained by totaling the calculation results sent from the calculation device for each diameter class.
The display device is a CRT or a monitor screen, and displays the calculation result of the diameter class.

By storing and managing the measured measured values on a cloud server, it is possible to transfer data between multiple workers (multiple shooting devices and arithmetic processing devices), and management materials and acceptance inspection materials by data transfer to customers. It is used for such purposes.

Next, the operation operation of the imaging measurement method of the diameter of the cut end face of wood of the present invention will be described with reference to FIGS. 1 (1) to (4).
(1) The timber felled in the forest is lined up in piles at the logging site in a flat vacant lot, and the felled timber is photographed one by one with a camera and two light spots irradiated with a laser emission module attached to the camera.
(2) By using both the image captured by irradiating the image as a reference for measuring the cut end face of wood and the image captured without irradiating for processing (analysis), the position of the irradiated light in the image. The distance is stored in the image and used as a measurement reference.
(3) After excluding the parts (cracks, knots, etc.) that should not be used for diameter measurement by AI (image analysis by machine learning) on the cut end face of wood, image processing is performed to determine the circular shape from the contour of the captured image.
(4) The center of gravity is obtained from the image-processed circular shape, the minimum value of the circular shape centered on the center of gravity is obtained, and the minimum value is described in the cross section of the measured wood.

The use of the measurement data will be described in (5) to (12) below.
(5) Transport the measured wood to the loading location on the truck and upload the measurement data of the captured image to a dedicated cloud server.
(6) For each truck loading work, the numerical value (measured value) written on the cross section of the wood is read from the cloud, the measured value is read and the data is accumulated in the device, the displayed value (measured value) is displayed for each truck loading work completion unit, and the truck is loaded. Compare with the actual product.
(7) At the same time as storing the measured value, the diameter class value is calculated on the reading device.
(8) Display the total number and display value (converted value) for each diameter class.
(9) Register the displayed value (converted value), and directly write the displayed value (converted value) on the photographed tree. The displayed value is processed in 1 cm increments for 14 cm or less, for example, 9 cm to 9.9 cm in diameter class of "9 cm", and for those exceeding 14 cm in 2 cm increments, for example, 14 cm to 15.9 cm in diameter class of "14 cm". , Automatically converted.
(10) The reading device automatically performs the predetermined aggregation and calculation for each customer file and registers it.
(11) Deliver wood to customers.
(12) The customer collates the actual product with the electronic record, sorts and stores the actual product for each diameter class, and gives work instructions for each class.
As described above, the present invention can automate the diameter-class work at the logging site, and the aggregated data can be easily used by the customer as an electronic file.

Claims (6)

A cross section of the felled wood is photographed one by one with a camera, image processing is performed to determine the circular shape from the contour of the captured image, the center of gravity is obtained from the image-processed circular shape, and the minimum circular shape centered on the center of gravity is obtained. A method for imaging and measuring the diameter of a cut end face of wood, which comprises obtaining a value, calculating a diameter class value from the minimum value of the captured image, and recording the total number and display value for each diameter class. A camera that cuts the felled wood one by one and photographs the circular end face, an image processing device that determines the circular shape from the captured image, and the center of gravity is obtained from the captured image, and the minimum value of the circular shape centered on the center of gravity is determined. A calculation device to be obtained, a calculation device that calculates a diameter class value from the minimum value of the captured image, a storage device that records the total number and display values for each diameter class, and a display device that displays the calculation result of the diameter class. An image pickup measuring device for the diameter of the cut end face of wood, which is characterized by being equipped with. It has at least one pair of irradiation devices that irradiate light as a reference for measuring the diameter of the cut end face of wood, and an image pickup measurement device that fixes the irradiation device to the camera, and serves as the reference in conjunction with the image pickup measurement device. A method for imaging and measuring the diameter of a cut end face of wood, characterized in that the diameter of the cut circular end face is measured by simultaneously imaging the irradiation point of light and processing the image obtained by the image. As the reference light for measuring the cut end face of wood, two laser light emitting modules are installed so that the lights are parallel to each other, and the two light spots reflected on the cut end face of wood to be measured are the measurement targets. The imaging measurement method for the diameter of a cut end face of wood according to claim 3, wherein a constant distance is maintained regardless of the distance from the cut end face of wood, which serves as a highly reliable reference for length. In the imaging measurement of the cut end face of wood according to claim 3, by using both the image taken by irradiating the image as a reference for measuring the cut end face of wood and the image taken without irradiating the image, the inside of the image is included. A method for imaging and measuring the diameter of a cut end face of wood, which is characterized by accurately determining the position of the light irradiated by. The image processing according to claim 3 is characterized in that the measurement accuracy is greatly improved by calculating the diameter of the cut end face of wood after excluding the defective portion by image analysis of the cut end face of wood by machine learning. Image measurement method of end face diameter.

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