JP2001324442A - Wastewater image apparatus and method for extracting impurity in wastewater using the apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a wastewater imaging apparatus for managing a water quality of an industrial wastewater 2 with using an LED 5 as a light source which can correctly extract and image a floc part 3 in the wastewater, even when a luminance of the LED 5 decreases by a change with time and other reasons. SOLUTION: A white background plate 6 is set to a transparent cell 1, in which the wastewater is stored to be opposite to a camera 4 for imaging the wastewater. The camera 4 is provided with a luminance-correcting means 7 corresponding to the illumination luminance of the LED 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wastewater photographing apparatus for photographing impurities in factory wastewater from a plating factory or the like and monitoring water quality, and a method for extracting impurities in wastewater using the apparatus.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional apparatus for photographing factory drainage using a camera using LEDs as a light source. In the figure, 1 is a cell formed of four transparent glasses for drawing in drainage, 3 is a flock in which impurities in the drainage are solidified, 4 is a camera for photographing drainage and floc, 5 is a straight line This is an LED illumination in which white LEDs having high directivity in the direction are densely arranged. The S / N ratio (Signal / Noise) of the camera is secured by irradiating a pair of LED illuminations on both sides. When the flock in the drainage is irradiated with LED illumination, the brightness of the flock portion of the image taken by the camera increases. By subjecting this image to binarization processing using a fixed threshold value, a floc portion in the drainage is extracted, and the quality of the drainage is monitored.

[0003]

In the photographing apparatus as described above, the brightness of the LED illumination is reduced due to the deterioration of the LED over time or for some reason. In such a state, the brightness of the flock portion photographed by the camera decreases. For this reason, when binarization processing with a fixed threshold value is performed, the floc portion is not accurately extracted,
As a result, there was a problem that stable wastewater quality control could not be performed.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and has provided a drainage photographing apparatus having a luminance correction processing means capable of performing accurate binarization processing even if an LED is deteriorated, and a device therefor. The aim is to obtain a method for extracting impurities in wastewater used, and thus to control excellent wastewater quality.

[0005]

In a drainage photographing apparatus according to the present invention, a white background plate is provided on a transparent cell into which drainage is drawn, and a camera for illuminating the cell with a pair of LEDs to photograph the drainage is provided on the white background. The camera is provided with a luminance correction means arranged opposite to the plate and corresponding to the illumination luminance of the pair of LEDs. In addition, this is a method of extracting impurities in wastewater by a wastewater photographing apparatus provided with a luminance correction unit corresponding to the illumination luminance of the LED.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 shows a photographing apparatus according to Embodiment 1 of the present invention. In the drawing, reference numeral 1 denotes a cell, 4 denotes a camera, 5 denotes a pair of LED lights,
Is a reflective plastic white background plate attached to the outer surface of the cell opposite to the camera, and 7 is a luminance correction means provided in the camera 4. The photographing device thus configured will be further described with reference to FIG. In addition, drainage and flock are explained
Illustration is omitted. FIG. 2 shows a photographing region of the camera. In the drawing, reference numeral 8 denotes a region where the white background plate 6 is attached to the outer surface of the cell 1 opposite to the camera 4;
Is an area where the white background plate 6 is not attached. That is, the white background plate 6 is attached only to the upper part of the cell 1 facing the camera 4. By attaching such a white background plate 6, it is possible to obtain sufficient luminance for camera photographing even in an empty state where no drainage enters the cell 1. This makes it possible to perform imaging under the same conditions after the cell 1 has not been operated after installation on the line and after a certain period of use. Further, by providing an area where the white background plate 6 is not attached, it is possible to provide a sufficient contrast difference between the flock portion 3 and the drainage portion when photographing the flock 3 during drainage. As described above, the luminance of the area of the white background plate 6 (hereinafter referred to as white background plate luminance) is measured by the camera 4 in a state where the inside of the cell is empty after the installation on the line and before the operation is started. After use, the cell 1 is emptied again and the white background plate luminance is measured. If the white background plate luminance is lower than before the start of operation, the LED lighting luminance deterioration due to LED deterioration or other reasons occurs. You can see that it is doing.

FIG. 3 further explains that the luminance of the white background plate after use for a certain period is lower than before the start of operation as described above. FIG. 3 is a graph showing the relationship between the luminance of the LED lighting and the luminance of the white background plate measured by the camera 4.
Before starting the operation, for example, the LED lighting luminance L1 at the time of shipment at a factory where the photographing device is completed is reduced to the LED lighting luminance L2 due to the deterioration of the LED caused by using the apparatus for a certain period. Therefore, the luminance of the white background plate also decreases from C1 to C2. Therefore, if the white background luminance C1 at the time of shipment is recorded and the white background luminance C2 after a certain period of use is measured, the correction coefficient = C1 / C2 can be obtained. The brightness can be corrected by multiplying the correction coefficient. The above processing is performed by the brightness correction means 7. As described above, the drainage photographing apparatus according to the present invention and the method for extracting impurities in wastewater using the apparatus can be used to incorporate the apparatus into a factory drainage line to monitor the flocs in the wastewater over time and to observe the LE change due to other reasons.
Even if the brightness of D5 decreases, the brightness correction means 7
, And the brightness of the flock portion of the image captured by the camera 4 can be kept high, so that the binarization process using the fixed threshold value can be stably performed. Although the plastic white background plate is shown as the white background plate, the material is not limited to plastic but may be other materials as long as it is of a white system. Further, since the white background plate 6 is provided only in the upper portion of the cell 1, the drainage photographing apparatus is used without filling the drainage 2 in the cell 1 completely and using the lower surface of the white background plate 6 as the drainage surface in the cell. Then, the degree of the decrease in the brightness of the LED can be checked without leaving the cell 1 empty, and the device can be continuously operated.

[0008]

Since the present invention is configured as described above, it has the following effects.

The luminance of the LED for illuminating the transparent cell into which the drainage is drained is measured by measuring the luminance of the background plate provided opposite to the camera, and the luminance is corrected by the luminance correction means of the camera. It is possible to provide a photographing device capable of stably performing a binarization process, and a method of extracting impurities in wastewater using the photographing device.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.

FIG. 2 shows a shooting area of the camera according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram of a method for calculating an LED brightness correction coefficient according to the first embodiment of the present invention.

FIG. 4 shows a conventional photographing apparatus.

[Explanation of symbols]

1 cell, 2 drains, 3 flocks, 4 cameras, 5
LED, 6 plastic white background plate, 7 brightness correction means.

Claims (3)

[Claims] 1. A transparent cell for receiving drainage, a pair of LEDs for illuminating the cell, a camera for photographing drainage in the cell, and a white background plate provided in the cell opposite to the camera. And a brightness correction means corresponding to the illumination brightness of the LED is provided in the camera. 2. The drainage photographing apparatus according to claim 1, wherein a white background plate is provided above the cell. 3. A method for extracting impurities from wastewater using the wastewater photographing apparatus according to claim 1.