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A black and odorous water body image extraction and recognition method

A black and odorous water body and identification method technology, applied in character and pattern recognition, instruments, computer parts, etc., can solve problems such as time-consuming and laborious, inability to quickly identify the distribution of black and odorous water bodies, and inability to infer black and odorous conditions. The effect of promotion

Pending Publication Date: 2019-06-28
中山市信息技术研究所 +1
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Problems solved by technology

The field survey results are accurate, but they can only be used to identify the collected sample points, and cannot infer the black and odor situation in the entire area. In addition, this method needs to collect water samples on the spot, which is time-consuming and laborious
Water quality indicators can quantitatively analyze the quality of water bodies, but also based on field sampling, cannot quickly identify the distribution of black and odorous water bodies in the entire region

Method used

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  • A black and odorous water body image extraction and recognition method

Examples

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Embodiment 1

[0021] Example 1: See figure 1 , a black and odorous water image extraction and recognition method, comprising the following steps:

[0022] A. Data preprocessing; divide the image into 3 color channels, convert the pixel value matrix, and extract the image of 101*101 pixels in the center of the water sample image; if the size of the original image is M×N, then the interception width is from the fix(M / 2) -50 pixels to fix(M / 2)+50 pixels, sub-images whose height is from fix(M / 2)-50 pixels to fix(M / 2)+50 pixels;

[0023] B. Image feature extraction, extracting the first-order color moment, second-order color moment and third-order color moment, wherein the first-order color moment adopts the first-order origin moment, reflecting the overall sensitivity of the image, the formula is as follows: The second-order color moment adopts the square root of the second-order central moment, which reflects the distribution range of the image color. The formula is as follows: The third-...

Embodiment 2

[0027] Embodiment 2, on the basis of Embodiment 1, the image features of this design mainly include color features, texture features, shape features, spatial relationship features, etc. Compared with geometric features, color features are more robust, and the size and The direction is not sensitive, showing strong robustness; because the water color image of the black and odorous water body is uniform, so the main focus is on the color features.

[0028] Color characteristics include:

[0029] Color histogram: Reflects the composition distribution of colors in the image, that is, which colors appear and the probability of each color appearing. Its advantage is that it can simply describe the global distribution of colors in an image, that is, the proportion of different colors in the entire image, and is especially suitable for describing images that are difficult to automatically segment and images that do not need to consider the spatial position of objects. Its disadvantag...

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Abstract

The invention discloses a black and odorous water body image extraction and recognition method. The method comprises the following steps: A, data preprocessing; dividing the image into three color channels, converting a pixel value matrix, and extracting an image of 101 * 101 pixels in the center of the water sample image; B, image feature extraction: extracting color moments of each order; C, taking 80% of samples as training samples, and taking the rest 20% of samples as test samples; D, training the model by using a training set sample; E, evaluating the performance of the model by using the test sample; the black and odorous water body image is obtained through the technologies of sampling, photographing and optical fiber transmission of the black and odorous water body, the image is identified through machine learning and other methods, the black and odorous water body is classified and registered, the black and odorous water body can be rapidly identified and the black and odorous water body treatment condition can be monitored in a region range, time and labor are saved, and application and popularization are easy.

Description

technical field [0001] The invention relates to a power saving system, in particular to an image extraction and recognition method for black and odorous water bodies. Background technique [0002] Urban black and odorous water body refers to the general term for water bodies that present unpleasant colors (black or blackish) and / or emit unpleasant odors (stinky or stench) in urban built-up areas. According to the degree of black odor, it can be subdivided into two levels: "mild black odor" and "severe black odor". The grading standards for "slight black odor" and "severe black odor" are as follows: if the transparency of the water body is between 25 cm and 10 cm, it is mild black odor; if it is less than 10 cm, it is severe black odor. If the concentration of ammonia nitrogen per liter of water is 8 to 15 mg, it is mild black odor, and if it is greater than 15 mg, it is severe black odor. [0003] The identification of black and odorous water bodies is mainly judged throug...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06K9/46G06K9/62
Inventor 隋明祥张志华
Owner 中山市信息技术研究所
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