TWI220175B - Atmosphere visibility automatic detection and analysis technique - Google Patents

Abstract

There is provided an atmosphere visibility automatic detection and analysis technique, which utilizes digital camera and image processing program to combine with atmosphere visibility engineering theory to replace the conventional technique of measuring atmosphere visibility by eye inspection. The system procedure includes: setting a target object and capturing its image; analyzing the digital gray-level brightness of the target and background in the image; and computing digital brightness feature values (Bg), that is visibility indicator deci-view (dV), based on the pixel contrast of image. The present invention is provided with the advantages and functions of fully avoiding the human error caused by manually detecting the visibility, automatically detecting the visibility and establishing an objective history record.

Description

1220175 V. Description of the invention (2) Important areas of influence ′ Different human observers have large human errors and are difficult to effectively represent by a quantitative objective unit. Moreover, in the environment, the probability of about 6ζ〇 will fall within this range of 5 to 10 kilometers, so, * s worthy of attention. & In addition, the traditional visual inspection method cannot reproduce the original observation space-time, lacks the basis of experience, and the most important thing is that it can only distinguish the maximum distance and cannot express the subjective visual sense of the people, nor can it provide characteristic visual images. In addition to manual visual inspection, there are also devices that detect the change in light intensity. When the light passes through the atmosphere, it is absorbed or scattered by particles, which causes the intensity to decline ^

, The principle of reduction 'to detect changes in light intensity. However, although the evaluation parameters for establishing visibility using the dimming of the intensity of photometry are mechanically accurate: k-points', it cannot take into account the human perception of the perception of the human senses for visibility. It is indeed impossible to construct comprehensive data of the landscape. Therefore, it is necessary to develop new technologies to solve the above disadvantages. [Summary of the invention] The main purpose of the present invention is to provide a self-test analysis technology for atmospheric visibility, which uses a crying instrument to detect a new, objective, and accurate ancient == significant value (ie visibility The indicator measurement unit, dv), completely avoids human error when measuring the visibility of person 2. The purpose of the detective, sight, and moon is to provide an automatic atmospheric measurement of 7-analysis technology, which can automatically detect the visibility. Detective, and eight = :: of χ § is to provide-automatic detection of atmospheric visibility = knife, which can establish objective historical records for related units to study, analyze and forecast. πIX.

Page 6 ^ 0175 V. Description of the invention (3) Nengao ΐ This is a method for calculating the unit of measurement by automatic atmospheric visibility detection and analysis technology, which includes the following steps ...) to get Erhuang t / 5 '(2) Analyze the exemption step; (3) Calculate the index step, and the density characteristic value (Bg), this can also be called the visibility index meter (dV, deci-View). Ϊ́ also provides a method for automatic reading and analysis of atmospheric visibility, // 4 steps: 0) digital image acquisition step; (2) image analysis step to establish child sign value calculation step; (4) artificial naked eye measurement step; and (5) Count 4 steps of correlation between heart mark and visual test.

The present invention also provides an automatic visibility and analysis device for atmospheric visibility, wherein t: ΐimage attack 'is used to manipulate at least one X by γ pixel digital image, = 6 /, the point has a predetermined gray level value, and the The distance between the observation point and the target object = a target distance, and each digital image contains a target object area and a background area adjacent to the target object area; a home control device that controls the image pickup device to read and Store digital image data; Μ a transmission device 'for transmitting the above digital image data; ^ a computing device having a computing element and a display element, the leaf element is used to determine the brightness of the target area A digital luminance characteristic value (Bg) is calculated from the value and the L-degree value of the background region, and the digital luminance characteristic value (B g) is visually recognized by the display element.

The above objects and advantages of the present invention can be easily understood from the detailed description and accompanying drawings of selected implementations below. J

Page 7 1220175 V. Description of the invention (4) The following [Implementation The present invention includes three index measurement sheets and atmospheric visibility. First, the energy used for technology. (1) The number of captured pixels is usually 0 to 255. The target object area (2) score is defined as the eye level value is determined (3) counting examples and the detailed description of the invention will be described later in conjunction with the drawings ...] This is an automatic atmospheric visibility detection and analysis technology, the basic parts: Atmospheric visibility automatic detection and analysis technology uses the calculation method of visibility level, atmospheric visibility automatic detection and analysis method and automatic detection and analysis device. As shown in the first figure, regarding the automatic detection and analysis of atmospheric visibility, the calculation method of the visibility index measurement unit includes the following steps

Image acquisition step 11: Please refer to the second image, first obtain an X by Y bit image, each pixel has a predetermined gray level value (pass), which includes at least a target area 51 and an adjacent domain 51 Background area 52; analysis of brightness step 12: the average gray level target object brightness value (B t) of the target area 51, and the average gray meaning of the background area 52 is the background area brightness value (Bb); calculation index Step 13: Substitute the following formula = log \ Bt-Bb 1 Bb

A digital brightness characteristic value (B g) is obtained, which can also be called the visibility index measurement unit (dV, deci-View). Secondly, regarding the method for automatically detecting and analyzing atmospheric visibility according to the present invention, please refer to the third figure, which includes the following steps:

1220175 V. Description of the invention (5) Point selection 211 and to capture an X times γ point has a predetermined target distance (L); the image is first shadowed to select an image. The back area of the object area 51 is used for pixel product formula.

n ^, digital image acquisition step 21: first select the observation object 212 'and set the imaging conditions 213, * prime digital image, as shown in the second figure, the grayscale value of each pixel' and the observation point and There are two targets between the objects. Image analysis step 22: The captured digital image is converted and transmitted 221, and then the image area is selected 222. The area package δ has a target area 5 1 and an adjacent target π area 5 2, respectively, the target area and the background distinguish operation 223; ^ Second, the degree-free feature value calculation step 2 3 ·· Substitute the following log

\ AiIA

Bb to get a digital brightness index unit of measurement (dV, dec IV, artificial naked eye measurement; five, to establish a digital index step and to obtain different correlations between the corresponding brightness relationship between different target distances, the relationship between the A and B A first coefficient (A) is -0 · 2186, and, of course, the measured eigenvalue (B g), which can also be referred to as visibility i-View); Step 24: Artificial naked eyes Observation visibility

Relevance to the eye test Step 2 5 ·· Repeat the detection of the target from the (L), and the characteristic value (B g) respectively, and get a linear system of (B g) = (A ) * (L) + (B), where the number and-the second coefficient. Wherein, the first coefficient and the first coefficient (B) are + 2 · 7 0 35. The values of the first coefficient (A) and the second coefficient (B) will change with 1220175 V. Description of the invention (6) in the same region. Here you can roughly estimate its main distribution range. The first coefficient (A) is between _01 and -0.3, and the second coefficient (B) is between +2.0 and +4.0. between. In addition, this linear relationship is statistically summarized from the many data that falls between 5 km and 10 km of visibility. As mentioned earlier, the interval between 5 km and 0 km is between poor visibility and fairly good visibility. In the environment, there is a 60% probability that the fuzzy zone will fall at this point. Therefore, the present invention can objectively, accurately, and effectively show the visibility state of this interval.

Regarding the physical device of the present invention, please refer to the fourth figure, which includes: an image capturing device 31 for capturing at least one X by γ pixel digital image; each pixel has a predetermined gray level value, and There is a target distance (L) between the observation point and the target object (three target objects 35A, mb, and 35C shown in the fourth figure). Moreover, each digital image includes a target object region 51 and an adjacent target object. Background area 52 of area 51; an image control device 3 2 that controls the image pickup device 31 to read and store the digital image data; a transmission split 33 for transmitting the above digital image data, which can be Internet Internet (Internet), the most effective, economical and convenient;

A computing device 34 has a computing element 341 and a display element 2 '. The computing element is used to calculate a digital brightness characteristic value (Bg) according to the brightness value of the target area and the party degree value of the scene area, and the obscure component displays the digital brightness characteristic value (B 8) and corresponding digital image data. The actual detection of the present invention is briefly described as follows:

1220175 V. Description of the invention (7) First, select a surrounding object to look around conveniently, either on the roof of the building or the observation deck, for example; take the building next to Kaohsiung Harbor as the target (see Annex 1); or Taking the roof of Taichung Port Affairs Building as the base point, you can target Datu Shantou in the east and the target in the west coastline or thermal power plant to the west. The acquisition time can be matched with the routine observation of the weather station observers, and the images are taken at five times of 8:00, 9: 00, H: 00, 14:00 and 17:00 daily for two consecutive weeks.

For the obtained digital image, the average grayscale value of the target area 5 丨 and the background area 52 can be calculated respectively. The average grayscale value of the target area 51 is defined as the target brightness value (B t), and The average gray level value of the background area 52 is defined as the background area brightness value (Bb). After being substituted into the above formula, a digital brightness characteristic value (B g) can be obtained, which can also be referred to as a visibility index. Unit of measurement (dV, deci-View), so the degree of visibility can be accurately and objectively expressed. Matching the record, this can be the target distance of the invention L = 5. The formula of the relationship of visibility correlation. In the future, the visual senses and the garden, the post-conservation episode, and the season will be found at the same time. Therefore, the automatic visibility zone and the interstitial fog can be used as evidence, and its digits can be more sensitively connected to the key points of the sexualized network. In addition to ^ «t * Kj, there is a relationship showing the characteristic brightness and further by It specifically indicates the remote control operation area, including (the seaport, the detection visibility detection data, and the compatibility of the two. As shown in the fifth figure, the value of a certain tower in the Nanxiong area and the surrounding environment are derived by visual statistical methods. Out-of-the-line design, which can be set at the weather stations at all levels and the national public airport), the metropolitan area traffic shows its atmospheric visibility value

1220175 V. Description of the invention (8), and establish a map of local environmental characteristics for the media (historical records of the Internet or electric images' can also be used to enter the subjective dislikes of cattle and apricots, transmission and images. Μ y investigate the visibility of human visual materials To sum up, the advantages and effects of the present invention can be summarized as: human error when measuring the visibility by means of work. In the present invention, a new, objective and precise method is detected by using an instrument in Bo: din, Din X Input, dv, noise-like measurement unit points / 70 Wang to avoid subjective consciousness and human error during manual observation

It can also be used to find errors caused by the same, different time, and different surrounding environments), and to achieve an accuracy that cannot be achieved by manual detection. $, 丨 处 [f = auto-detection. If the present invention is combined into an entire system, the purpose of the second generation can be achieved. Even, the Internet can be used for viewing, exhibition, and exhibition of multiple large-scale towels, tourism, transportation, and research units at the same time. In particular, it can be combined with the data of aerial imaging units to develop the atmospheric visibility forecasting mechanism based on monthly, monthly, and remotely dependent data. Zi Xie H Z ί ί objective historical records. Since the present invention can record the visibility for a long time; 2 Yake can be stored for post-analysis or research purposes, so two, this visibility historical data, and further can be used as a basis for constructing correlations between different areas of imagery and understanding. Scope. 7 early modifications and changes are not Departing from the spirit of the present invention and the invention of 碹, t 成,, f, and Tian, we can know that this artist knows that the present invention can indeed achieve the descriptive purpose, and it has actually met the provisions of the Patent Law. I love to propose invention 1220175 V. Invention Explanation (9) Patent application [Annex] Annex 1: Digital image photo of a high-rise building in Kaohsiung as the target

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Claims (1)

1220175 VI.Scope of patent application • A method of calculating the visibility refers to the unit of the number of rods used in the automatic detection and analysis technology of atmospheric visibility, which includes the following steps: D. Steps of capturing images · First obtain a digital image of a pixel, each pixel has A predetermined gray level value, which includes at least a target area and a background area adjacent to the target area ^ Analysis of brightness step: The average gray of the target area is defined as the target brightness value (B t), and the background region's order value is defined as the background region brightness value (B b); 1 2 · Obtain a digital brightness characteristic value (B g) indicator measurement unit (dV, deci-View). This can also be called the visibility automatic atmospheric visibility detection and analysis method. It includes the following steps. Digital image acquisition steps: first Guanxin selects the site and object, and sets the imaging conditions. Digital image, each pixel has: pre- = x times γ pixel measurement point and target--target distance (L); Λ order value 'and the second, image analysis steps: the captured digital image Conversion and transmission, and then image area selection: the / area contains a target area and-an adjacent image should not be performed on the target area and the background area; 1220175 VI. Scope of patent application 5 Calculate the image of the light-emitting element in the meta area. If you apply for the analysis of the device ’s degree value and the field brightness BJ, a transmission device is used for transmission. It has a digital display to calculate the digital display according to the project. The installation parts are displayed in degrees and values. Patent range, in which the background value and then the fourth item of the display area, the calculated single area brightness value takes its logarithmic value display element and displays the above-mentioned digital image data; a calculation element and a display element, the object area of the target object The brightness value is divided by the background brightness characteristic value (B g), and the brightness characteristic value (B g) and the corresponding number of atmospheric visibility automatic detection elements are calculated by dividing the absolute value of the difference between the brightness of the target area The background area becomes the digital brightness characteristic value (showing the corresponding digital image data. Page 17