JP3107700B2 - Water turbidity measuring method and turbidity measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an aquarium aquarium,
The present invention relates to a measuring method and a measuring device for measuring turbidity of water in a pool or the like.

[0002]

2. Description of the Related Art Conventionally, when measuring the turbidity of water, which is one of the water quality control items in an aquarium aquarium, a pool, or the like, an operator collects water each time, and adds wavelength to the sample water. Was measured by irradiating light at 550 nm or 650 nm, measuring the absorbance, and calculating the turbidity from the absorbance of the kaolin standard solution.

[0003]

According to the above-mentioned conventional turbidity measuring method, an operator has to collect water every time the measurement is performed, which is very troublesome and does not provide visual transparency. There was a disadvantage.

Accordingly, an object of the present invention is to provide a method and an apparatus for measuring turbidity of water which can solve the above-mentioned problems.

[0005]

In order to solve the above-mentioned problems, a method for measuring turbidity of water according to the present invention comprises disposing a measuring plate on which a mark consisting of a line is displayed inside or outside a water tank, A mark on the plate is photographed by a camera device from a location separated by a predetermined distance, and image data photographed by the camera device is binarized by a predetermined threshold value, and the binarized data signal width and turbidity are obtained. This is a method of measuring the turbidity of water in an aquarium based on the degree .

Further, the water turbidity measuring device of the present invention comprises a measuring plate which is disposed inside or outside a water tank and on which a mark composed of a line is displayed, and a mark on the measuring plate which is separated by a predetermined distance. And a signal processing device for inputting image data captured by the camera device and performing predetermined signal processing, and the signal processing device converts the image data to a predetermined threshold value. A binarization circuit for binarizing the data, a detection circuit for inputting the data binarized by the binarization circuit and detecting the data signal width, and data of a signal width obtained by the detection circuit. And a determination circuit for determining the turbidity of water from the relationship between the signal width of the binarized data and the turbidity .

[0007]

According to the turbidity measuring method and the turbidity measuring device described above, a mark composed of a line arranged inside or outside the water tank is photographed by the camera device, and the photographed image data has a predetermined threshold. The turbidity of water is automatically and accurately measured because the turbidity is calculated according to the signal width of the data subjected to the binarization processing. be able to.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. First, an apparatus for measuring turbidity of water in a water tank will be described with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a turbidity measuring device for measuring the turbidity of water in an aquarium 2 in an aquarium, for example.
A measurement plate 4 having a mark (similar to a barcode) 3 composed of a plurality of lines 3a having different widths as shown in FIG.
And the measuring plate 4 disposed outside the other side wall of the water tank 2.
And a signal processing device 6 for inputting image data captured by the camera device 5, performing predetermined signal processing, and detecting turbidity of water.

The signal processing device 6 has a binarization circuit 11 for binarizing image data from the camera device 5 with a predetermined threshold value, and the binarization circuit 11 binarizes the image data. A detection circuit 12 for inputting data and detecting a signal width of the binarized data, and a determination circuit 13 for determining turbidity of water from the data of the signal width obtained by the detection circuit 12. ing.

Next, a method for measuring the turbidity of water in a water tank using the turbidity measuring device will be described. First,
The measuring plate 4 is arranged just outside one side wall of the water tank 2 to be measured, and the camera device 5 is arranged just outside the other side wall portion of the water tank 2, and the surface of the measuring plate 4 is That is, the mark 3 is photographed.

The image data of the mark 3 of the measuring plate 4 taken by the camera device 5 is input to the signal processing device 6 and is converted by the binarization circuit 11 into a binary signal with a predetermined threshold value. Is done.

For example, as shown in FIGS. 3A to 3D, in the fresh water state (a), when binarization is performed with a predetermined threshold value A, the signal width of the original image data a and The signal width of the binarized data b is the same, and as shown in (b) and (c), when the water becomes dirty, the width of the high level portion of the image data a becomes narrow. Therefore, when this is binarized with a predetermined threshold value A, the signal width of the binarized data (indicated by a broken line) b becomes narrow.

Further, when the water stain becomes severe, the image data a becomes a low level as shown in (d). Therefore, when this image data a is binarized with a predetermined threshold value A, No data signal is output.

As described above, since the width of the high-level portion of the image data a changes in accordance with the dirt, the signal width of the binarized data b is detected by the detection circuit 12 and further detected. The signal width is sent to the decision circuit 13. Then, in the determination circuit 13, the turbidity corresponding to the binarized data is obtained from the relationship between the signal width of the binarized data and the turbidity. FIG. 4 is a graph showing the relationship between the signal width of the binarized data and the turbidity.

The mark 3 of the measuring plate 4 is provided with a plurality of lines 3a having different widths. When determining the turbidity, an appropriate line, for example, a wide line 3a is determined. Of course, a graph corresponding to the wide line 3a used is used as the graph showing the relationship between the signal width of the binarized data used for the determination and the turbidity.

Then, the turbidity obtained by the determination circuit 13 is sent to a display device (or a recording device) and displayed. In this way, the mark 3 consisting of the line of the measuring plate 4 arranged outside the water tank 2 is photographed by the camera device 5 arranged outside the water tank 2 on the opposite side, and the photographed image data is added to the predetermined image data. By performing a binarization process with a threshold value, obtaining a signal width of the data subjected to the binarization process, and obtaining a turbidity corresponding to the signal width by a determination circuit 13, automatically and automatically. The turbidity of water can be measured accurately.

In the above embodiment, when the turbidity is determined, the determination is made by focusing on one line 3a of the marks 3, but the determination is made by focusing on all the lines 3a. You may do it. It is also possible to visually check the mark 3 to see which line 3a of which width is clearly visible, and determine the turbidity from the line 3a of this clearly visible width. FIG. 5 is a graph showing the relationship between the width of the visible (visible) line 3a and the turbidity.

In the above embodiment, the case where the turbidity of water is measured has been described. However, it is needless to say that the transparency can be known by determining the correlation between the turbidity and the transparency of water. .

Further, in the above embodiment, the measuring plate 4
And the camera device 5 are arranged outside the water tank 2, but depending on the case, either one or both of the water tank 2
It may be arranged inside. This measurement method is also applicable to the measurement of turbidity of water in a pool or the like. In this case, the measurement plate 4 and the camera device 5 are arranged in water to perform measurement.

When determining the turbidity, one line 3a
In the case of using the mark 3, the mark 3 is simply
The one constituted by only one line may be used.

[0022]

As described above, according to the water turbidity measuring method and the turbidity measuring device of the present invention, a mark composed of a line arranged inside or outside a water tank is photographed by a camera device, and the photographed image is taken. The image data is subjected to a binarization process with a predetermined threshold value, and the turbidity is determined according to the signal width of the data subjected to the binarization process. Turbidity can be measured, and thus water quality management can be automated. The transparency can also be known by visually checking the mark.

[Brief description of the drawings]

FIG. 1 is a plan view showing a schematic configuration of a turbidity measuring device according to an embodiment of the present invention.

FIG. 2 is a front view showing a mark displayed on a measurement plate in the embodiment.

FIG. 3 is a waveform chart showing image data and a data signal subjected to a binarization process in the embodiment.

FIG. 4 is a graph showing a relationship between a signal width of data subjected to binarization processing and turbidity in the embodiment.

FIG. 5 is a graph showing the relationship between visible line width and turbidity in the example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Turbidity measuring device 2 Water tank 3 Mark 3a line 4 Measuring plate 5 Camera device 6 Signal processing device 11 Binarization circuit 12 Detection circuit 13 Judgment circuit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-134544 (JP, A) JP-A-57-26735 (JP, A) JP-A-63-188741 (JP, A) 53348 (JP, U) JP-A 52-87281 (JP, U) JP-A 6-78883 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01N 21/00-21 / 01 G01N 21/17-21/61 G01N 33/18 JICST file (JOIS)

Claims (2)

(57) [Claims] 1. A measuring plate on which a mark consisting of a line is displayed is arranged inside or outside a water tank, and the mark of the measuring plate is
An image is taken by a camera device from a location separated by a predetermined distance, image data taken by the camera device is binarized by a predetermined threshold value, and the binarized data signal width and turbidity
A method for measuring the turbidity of water in a water tank according to the relationship : 2. A measuring plate which is disposed inside or outside a water tank and on which a mark composed of a line is displayed, a camera device which photographs the mark of the measuring plate from a place at a predetermined distance, and a camera device comprising: A signal processing device configured to input photographed image data and perform predetermined signal processing, and the signal processing device includes a binarization circuit that binarizes the image data with a predetermined threshold value; a detection circuit for detecting the data signal width inputs the binarized data in this binarizing circuit, by inputting data obtained signal width in this detection circuit, the binary data Signal width and turbidity
A water turbidity measuring device, comprising: a determination circuit for determining turbidity of water from a degree relationship .