JPH05172550A - Measuring apparatus for height of net of melon - Google Patents

Abstract

PURPOSE:To realize a labor saving by automation of measurement by accomplishing the quantitative measurement of the height of net of a melon. CONSTITUTION:Melon (a) is turned and detection signal (data) from a displacement meter 3 is inputted while it turns. The detection signal gives a waveform combining a component with a high frequency corresponding to a ground part of the skin of the melon and nets parts thereof and a component with a low frequency as generated depending on the distortion of the melon and the way the melon is placed during the measurement. So, a high pass filter processing is performed to remove the part with the low frequency unnecessary for measuring the height of nets of the melon from the detection signal of the displacement meter 3. Since the signal processed corresponds to irregularities of the ground part and the net parts of the skin of the melon, the signal (waveform) under-goes a differentiation processing to determine maximal and minimal values. Moreover, the distance between the maximal and minimal values thus obtained is determined to obtain the height of the nets.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring the stripe height (height) of a net-type melon having stripes (mesh) on the surface.

[0002]

2. Description of the Related Art In a net-type melon, the degree of swelling of stripes is regarded as an important quality factor for appearance, because the swelling of each stripe formed on the surface cannot be strong or weak. .. Therefore, conventionally, the inspector visually observes the swelling of the stripes one by one.

[0003]

However, such a conventional method has a problem that the melon stripes can be evaluated only qualitatively such as good, normal or bad. Further, since an inspector is required, labor saving of the evaluation work has been desired.

Therefore, an object of the present invention is to realize quantitative measurement of the height of the melon stripes and to realize labor saving by automating the measurement.

[0005]

In order to achieve the above object, the present invention has the following constitution. That is, rotating means for rotating the melon having stripes, unevenness detecting means for detecting unevenness on the surface of the melon being rotated by the rotating means, and necessary for measuring the height of the melon stripe from the detection signal of the unevenness detecting means. It comprises a signal extracting means for extracting various components, an extreme value calculating means for obtaining an extreme value of the extracted signal, and a height calculating means for obtaining the height of the melon stripe from the obtained extreme value.

[0006]

In the present invention, the melon having the stripes is rotated by the rotating means, and the unevenness of the melon surface during the rotation is detected by the unevenness detecting means. The detection signal detected by the unevenness detection means is composed of a high-frequency component corresponding to the ground portion and the striped portion of the melon skin and a low-frequency component caused by melon distortion and placement of the melon during measurement. The waveform will be However, the latter low frequency component is not needed for fringe height measurement.

Therefore, the signal extracting means extracts only the component necessary for measuring the height of the melon stripe from the detected signal. Next, the extreme value calculation means obtains the maximum value and the minimum value from the extracted signal, and the height calculation means obtains the height of the fringes on the melon surface from the obtained extreme value.

As described above, in the present invention, the melon is rotated to detect the unevenness of the skin, only the component necessary for measuring the height of the stripe is extracted from the detected signal, and the stripe of the stripe is extracted from the extreme value of the extracted signal. Since the height is determined, the height of the stripe can be measured quantitatively and with high accuracy, and the measurement work can be saved by the automatic measurement.

[0009]

EXAMPLE An example of the present invention will be described with reference to FIG.

In FIG. 1, reference numeral 1 is a bucket for accommodating a net-type melon a having stripes (nets) to be measured, and the bucket 1 is constructed to rotate at a constant speed by a bucket driving device 2. A displacement that irradiates spot light such as laser light toward the equator of the melon a around the melon a accommodated in the bucket 1 and receives a reflected light from the surface to output a signal according to the distance. Place form 3. The displacement type 3 is connected to a computer 5 via an A / D conversion circuit 4. The computer 5 is composed of a CPU, a memory and the like, and performs control and signal processing as described later. Further, the computer 5 has a bucket drive device 2
Connect.

Next, an operation example of the embodiment thus configured will be described with reference to the flowchart of FIG.

Now, when a drive signal is supplied to the bucket drive device 2, the bucket 1 rotates (S1), and the melon a on the bucket 1 also rotates accordingly. With this rotation,
When the detection signal (data) from the displacement type 3 is fetched (S
2), for example, a detection signal as shown in FIG. 3 is obtained. This detection signal is composed of a high frequency component corresponding to the ground portion and the striped portion of the melon skin and a low frequency component caused by the distortion of the melon and the placement of the melon in the bucket 1 at the time of measurement. It becomes a waveform (see FIG. 3).

In FIG. 3, the high frequency components corresponding to the ground portion and the striped portion of the melon skin have a convex portion corresponding to the ground portion of the melon skin and a concave portion corresponding to the striped portion, The difference between the mountain and the valley corresponds to the height of the stripe.

Next, from the detection signal of the displacement type 3, a portion having a low frequency unnecessary for height measurement of the melon stripe is removed, and a high-pass filter process is performed to extract only a portion having a high frequency necessary for height measurement. (S3). An example of this processing will be described. First, as shown in FIG. 4, a regression equation of the displacement type 3 detection signal is obtained, and then the difference between the detection signal and the regression value is calculated to obtain a signal as shown in FIG. obtain. The high-pass filter processing may be performed by expanding the detection signal into a Fourier series and removing low-frequency components from the components, or a hardware filter may be used.

The signal thus obtained shown in FIG. 5 corresponds to the ground portion and the striped portion of the melon skin, and its convex portion corresponds to the ground portion of the melon skin and its concave portion. Corresponds to the stripe portion, and the difference between the peak and the valley corresponds to the stripe height. Therefore, the signal (waveform) of FIG. 5 is differentiated to obtain the maximum value and the minimum value (S4). further,
When the distance between the obtained maximum value and minimum value is calculated (S
5) The obtained distance becomes the height of the melon stripe. The calculation of the extreme value may be obtained by detecting the increase / decrease of the waveform.

Next, another embodiment of the present invention will be described with reference to FIG.
~ It demonstrates with reference to FIG.

In this embodiment, a rotating portion 13 which is rotated by a rotating portion motor (not shown) is provided on the carrying tray 12 placed on the conveyor 11, and the rotating portion 13 accommodates the net melon a. Constitute. The rotating unit 13 is provided with a label 14 for detecting that the rotating unit 13 has made one rotation during measurement. Further, a stopper 15 is provided on the transport tray 12 for stopping at the position of the label 14 when the rotating portion makes one rotation. Spot light such as laser light is emitted toward the equator of the rotating melon a by the rotating unit 13 in a direction orthogonal to the carrying direction of the carrying tray 12.
A displacement meter 16 for detecting the reflected light is arranged.

In the embodiment configured as described above, control and signal processing are performed as follows by a computer (not shown) for control processing, which will be described with reference to the flowchart of FIG. This processing is to detect a double cracked portion having a concave cross section that occurs at the center of the melon stripe as shown in FIG.

Now, when the rotating part 13 accommodating the melon a comes to the measuring position, the conveyance of the conveyor 11 is stopped. Then, when the rotating unit 13 is rotated (S11), the melon a starts rotating. Therefore, the detection signal (data) of the displacement type 16 is fetched (S12). Next, the threshold value TH as shown in FIG. 9 is set (S13), and the signal (data) above the threshold value TH is extracted from the detection signal (S14). Then, the peak P as shown in FIG. 9 is included in the extracted signal.
When there is a portion having two bottoms B between the peaks P1 and P2 while having two 1, P2,
It is detected as a double cracked portion (S15). This detection is performed by differentiating the signal.

As described above, in the above embodiment, the waveform (data) relating to the evaluation of double cracks in the stripes is obtained from the detection signal on the melon surface, and the presence or absence of double cracks is obtained from the data. If this process is added to the process shown in FIG. 2, it is possible to perform a fine evaluation on the melon stripes.

[0021]

As described above, according to the present invention, the melon is rotated to detect the unevenness of the epidermis, only the component necessary for the evaluation of the stripes is extracted from the detected signal, and the extreme value of the extracted signal is obtained. Since the height of the stripe is calculated from the above, the height of the stripe can be measured quantitatively and with high accuracy, and the measurement work can be saved by the automatic measurement.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a flowchart illustrating signal processing of the embodiment.

FIG. 3 is a diagram showing an example of displacement type detection signals.

FIG. 4 is a diagram showing a detection signal in a region A of FIG. 3 and its regression equation.

FIG. 5 is a diagram in which a difference between the detection signal and a regression value is obtained.

FIG. 6 is a block diagram of another embodiment of the present invention.

FIG. 7 is a flowchart illustrating the signal processing of the embodiment.

FIG. 8 is a cross-sectional view illustrating double cracking of melon stripes.

FIG. 9 is a diagram showing an example of a detected waveform. 1 bucket 2 bucket drive 3 displacement type 5 computer

Claims (1)

[Claims] 1. Rotating means for rotating a melon having stripes, unevenness detecting means for detecting the unevenness of the surface of the melon being rotated by the rotating means, and the height of the melon stripe from the detection signal of the unevenness detecting means. It is provided with a signal extraction means for extracting components necessary for measurement, an extreme value calculation means for obtaining an extreme value of the extracted signal, and a height calculation means for obtaining a height of the melon stripe from the obtained extreme value. A melon stripe height measuring device.