JPH07296192A - Image information processor - Google Patents

Abstract

PURPOSE:To provide an image information processor capable of finding first- order reflected light on a ground level even in every kind of geographic area with high accuracy. CONSTITUTION:This image information processor which reproduces the multiple scattering of light on an atmosphere-ground level when the image of the ground level is photographed from an artificial satellite or plane by computer simulation is constituted by providing at least an altitude read-in part 131 which fetches in the altitude information of the ground level, an information storage part 132 which reads in the photographing condition of an image, a geographic model generating part 133 which generates a geographic model from the altitude information, a first-order incident light generating part 134 which generates first-order incident light considering the multiple scattering of the light in the geography of an ambient area by using the altitude information, the photographing condition and the geographic model, and a first-order reflection judging part 135 which judges whether or not the first-order incident light is reflected on the ground level.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to image information processing for reproducing the state of multiple scattering or radiative transfer of light between the atmosphere and the ground surface when an image of the ground surface is taken from a satellite or an aircraft by computer simulation. The present invention relates to an apparatus, and in particular, to a technique for producing primary reflected light and secondary reflected light on the ground surface, and a radiated transfer light reproduction technique for reproducing the state of radiative transfer of light on the atmosphere-ground surface.

[0002]

2. Description of the Related Art When reproducing the state of multiple scattering of light on the atmosphere-ground surface when an image of the ground surface is taken from an artificial satellite or an aircraft by computer simulation, first-order reflected light on the ground surface is created. However, there are cases where the effect of multiple scattering of light on the topography of the surrounding area on the primary reflected light cannot be ignored. Therefore, various measures have been taken to obtain the primary reflected light in consideration of the effect of this multiple scattering in some form. As a conventional technique of this type, for example, only straight light between the position of the sun when the image was captured and the position where the primary reflected light is to be obtained (attention position) is considered, and the terrain that blocks this is considered. A method to determine the primary reflected light as the influence of the terrain in the peripheral region on the primary incident light, or the presence or absence of the terrain that blocks the primary incident light is limited to neighboring regions, such as adjacent pixel regions. There is a method of obtaining the primary reflected light as an effect of the on the primary incident light.

On the other hand, in the above computer simulation, there are cases where the influence of secondary reflected light on the ground surface cannot be ignored. Therefore, various measures are taken to obtain the secondary reflected light. As a conventional technique of this type, for example, the distance until the light collides with the atmospheric component (the free path length of the light) is defined as the reflection limit distance of the secondary reflected light, and the two A method of calculating the secondary reflected light and using it as the secondary reflected light of the atmosphere-ground surface simulation, or a neighboring area, for example, an adjacent pixel area, as the secondary reflected light reflection area, and the secondary reflection occurring within that range. There is a method of calculating light and using it as the secondary reflected light of the atmosphere-ground surface simulation.

Further, in reproducing the radiative transfer of light from the atmosphere to the ground surface when an image of the ground surface is taken from an artificial satellite or an aircraft by computer simulation, the radiative transfer light is reproduced by using the Monte Carlo method. The method is widely known. As a conventional technique of this type, for example, as described in "Image Analysis Handbook (Takagi, Shimoda, The University of Tokyo Press)", the state of the atmosphere and the ground surface at the time of image capturing is modeled, and a simulation model is created.
There is a method of reproducing radiatively transmitted light by injecting photons into the simulation model from the upper surface of the atmosphere by random numbers and calculating the scattering in the atmosphere and the reflection on the ground surface.

[0005]

However, among the above-mentioned conventional methods of creating primary reflected light, the method of evaluating the influence by the position of the sun and the topography between the sun and the region of interest takes into consideration the scattering of light by the atmosphere. Since it is not available, it is not possible to create a weak primary reflected light on the ground surface, and an error has occurred especially in the simulation of a mountainous area with large undulations. Moreover, the method of using only the neighboring area as the affected area could not sufficiently reproduce the effect of the surrounding terrain, and a large error occurred especially in the simulation of a mountainous area with a large undulation.

On the other hand, among the above-mentioned conventional secondary reflected light producing methods, the method using the free path distance has a problem that the simulation time becomes very long. Also, with the method of using the neighboring area, the secondary reflected light cannot be sufficiently reproduced,
In particular, a large error occurred in the simulation of a mountainous area with a large undulation.

Further, in the above-mentioned conventional radiative transfer light reproduction method, although multiple scattering of light in the atmosphere is taken into consideration, multiple scattering of light in the terrain is not taken into consideration. There was a large error in the simulation.

The present invention has been made under the above background,
A first object of the invention is to provide an image information processing apparatus capable of highly accurately obtaining the primary reflected light on the ground surface in any terrain region. A second object of the present invention is to provide an image information processing apparatus capable of quickly and highly accurately obtaining the secondary reflected light in any geographical area. A third object of the present invention is to provide an image information processing apparatus capable of obtaining the state of radiation transfer of light with high accuracy in any terrain region.

[0009]

According to the first aspect of the present invention, based on the altitude information of the photographed area, the incident direction of the primary incident light, and the maximum altitude value on the earth, the surrounding topography of each primary incident light is calculated. The affected area is calculated, and the primary incident light is obtained as the effect of the presence or absence of multiple scattering in this area on the primary incident light.
In this way, the first objective is achieved by creating the primary reflected light from the primary incident light. That is, in an image information processing apparatus that reproduces multiple scattering of light on the atmosphere-ground surface when an image of the ground surface is taken from an artificial satellite or an aircraft by computer simulation, the altitude information acquisition that acquires the altitude information of the ground surface. Means, an imaging condition reading means for reading the imaging conditions of the image, a terrain model creating means for creating a terrain model from the altitude information, and a terrain of a peripheral region using the altitude information, the imaging conditions and the terrain model. A primary incident light creating unit that creates a primary incident light in consideration of multiple scattering of light, and a primary reflection determining unit that determines whether or not the primary incident light is reflected by the ground surface. To do.

In the second invention, the distance at which the secondary reflected light is reflected is calculated from the altitude information of the photographed area, the maximum and minimum altitude values on the earth, and the resolution of the image, and the area within this range ( The secondary reflected light generated in the reflection area) is used as the secondary reflected light in the atmosphere-ground surface simulation, and thereby the second object is achieved. That is, in an image information processing apparatus that reproduces multiple scattering of light on the atmosphere-ground surface when an image of the ground surface is taken from an artificial satellite or an aircraft by computer simulation, the altitude information acquisition that acquires the altitude information of the ground surface. Means, an imaging condition reading means for reading the imaging condition of the image, a reflection distance calculating means for calculating a reflection distance of secondary reflected light from the altitude information and the imaging condition, and a terrain model is created from the altitude information. Topographic model creating means, secondary incident light creating means for creating secondary incident light using the elevation information, the topographic model, the reflection distance, and the imaging conditions, and the secondary incident light is on the ground surface. Secondary reflection determining means for determining whether or not the light is reflected.

According to the third aspect of the present invention, as the multiple scattering in the terrain in the reproduction of the radiated transfer light, regarding the light (primary reflected light) that is incident from the upper surface of the atmosphere and reflected on the ground surface, from the elevation information and the imaging condition of the photographed area. , The area (influence area) where the effect of multiple scattering on the terrain is affected when the photons are incident on the ground surface, the multiple scattering of light on the terrain in this area is taken into consideration, and after the reflection on the ground surface By considering multiple scattering in the terrain as the secondary reflected light, the above second object is achieved. That is, in an image information processing device that reproduces the state of radiative transfer of light from the atmosphere to the ground surface when an image of the ground surface is taken from an artificial satellite or an aircraft by computer simulation, an altitude that captures the altitude information of the ground surface. Information capturing means, imaging condition reading means for reading the imaging conditions of the image, optical path brightness creating means for creating an optical path brightness from the imaging conditions, and multiplexing of light on the topography of the surrounding area from the altitude information and the imaging conditions. Primary reflected light creating means for creating primary reflected light considering the influence of scattering, secondary reflected light creating means for creating secondary reflected light from the altitude information and the imaging condition, and ground surface reflected light from the imaging condition Arrival rate calculation means for calculating the arrival rate to the upper surface of the atmosphere, the optical path luminance, the primary reflected light, the secondary reflected light,
And a radiative transfer light reproducing means for reproducing the state of radiative transfer of light from the atmosphere to the ground surface based on the arrival rate.

[0012]

In the first aspect of the invention, the primary reflected light is the light of the primary incident light which is reflected on the ground surface. Therefore, whether the primary reflected light is generated or not depends largely on the incident amount of the primary incident light. On the other hand, whether or not the primary incident light is generated depends largely on whether or not the sunlight is blocked by the terrain in the peripheral region before reaching the region of interest. The present invention focuses on such a property of the primary reflected light. First, the incident direction of the primary incident light on the ground surface is obtained from the altitude information of the ground surface and the image capturing conditions. From the terrain model created from elevation information, this incident direction, and the maximum elevation value on the earth at the time of shooting, the peripheral area (influence area) that affects this incident light is calculated, and the incident light in the terrain in this area is calculated. Whether or not the primary incident light reaches the ground surface is determined by whether or not it is blocked. It is determined whether the primary incident light thus created is reflected on the ground surface. As a result, primary reflected light is created.

In the second aspect of the invention, the secondary reflected light is light of the primary reflected light which is scattered by the surrounding terrain before going out into the atmosphere. Therefore, whether or not the secondary reflected light is generated depends largely on the topography of the surrounding area. The present invention focuses on such a property of the secondary reflected light,
First, the altitude information of the ground surface and the image capturing conditions (maximum and minimum altitude values on the earth at the time of image capturing, image resolution)
Is calculated as a reflection distance of the secondary reflected light. In addition, a terrain model is created from the altitude information. From this terrain model, elevation information, reflection distance, and imaging conditions, it is determined whether the primary reflected light in the area within the reflection distance reaches the ground surface of the area of interest (secondary reflection position), and the secondary incident light is determined. create. It is determined whether this secondary incident light is reflected on the ground surface. As a result, secondary reflected light is created.

In the third invention, the primary reflected light of the radiative transfer light between the atmosphere and the ground surface is the light reflected by the ground surface of the primary incident light. Therefore, whether the primary reflected light is generated or not depends largely on the incident amount of the primary incident light. On the other hand, whether or not the primary incident light is generated depends largely on whether or not the sunlight is blocked by the terrain in the peripheral region before reaching the region of interest. The secondary reflected light is light of the primary reflected light that is scattered by the surrounding terrain before going out into the atmosphere. Therefore, whether or not the secondary reflected light is generated depends largely on the topography of the surrounding area. The present invention focuses on such properties of the primary reflected light and the secondary reflected light. First, from the altitude information of the ground surface and the imaging conditions of the image, the influence of multiple scattering of light on the terrain of the surrounding area. The primary reflected light is calculated in consideration of. In addition, the secondary reflected light is calculated from the altitude information of the ground surface and the image capturing conditions. The optical path brightness and the arrival rate of the reflected light on the ground surface to the atmosphere are calculated from the imaging conditions. This optical path brightness, primary reflected light, secondary reflected light,
And the arrival rate of reflected light is used to reproduce the state of radiative transfer of light.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the first to third inventions will be described in detail below with reference to the drawings. FIG. 1 is a block diagram of an image information processing apparatus according to an embodiment of the first invention, showing an example of an apparatus for creating primary reflected light on the ground surface. In FIG. 1, 11 is an external device, 12 is an external input device, 13 is a primary reflected light producing device, and 14 is an output device. The primary reflected light creation device 13 includes an altitude reading unit 131, an information storage unit 132,
The terrain model creation unit 133, the primary incident light creation unit 134, and the primary reflection determination unit 135 are included.

The external device 11 is, for example, an MT or an external storage device that stores altitude information in advance, and inputs altitude information of an area corresponding to an image to the primary reflected light producing device 13. The external input device 12 is, for example, a keyboard or the like, and inputs the image capturing conditions to the primary reflected light creating device 13. Instead of the keyboard, it is also possible to use an MT that stores imaging conditions in advance, an external storage device, or the like. The primary reflected light creation device 13 creates primary reflected light using the altitude information input from the external device 11 and the imaging conditions input from the external input device 12. This will be described later. As the output device 14,
A CRT display device, printer, computer storage device or the like is used.

Next, with reference to FIGS. 2 and 3, the operation of the primary reflected light producing apparatus 13 having the above-mentioned configuration will be described. 2 is a flowchart showing the processing procedure of the primary reflected light producing device 13, FIG. 3 is a flowchart showing the processing procedure of the primary incident light producing unit 134, and S represents the step of each processing.

The altitude information input from the external device 11 is read by the altitude reading unit 131 and converted into information suitable for subsequent processing, for example, an altitude value for each pixel of the image (S11: altitude information input means). ). In addition, the imaging conditions stored in the information storage unit 132 in advance are read from the external input device 12 (S12: imaging condition input means). This imaging condition includes all data relating to the imaging condition of the image, such as the resolution of the image, the wavelength detected by the image sensor, the condition of the atmosphere, the position of the sun, and the maximum altitude value on the earth at the time of photographing.
The terrain model creation unit 133 models the terrain model necessary for the post-stage processing, for example, the inclination of the ground surface for each pixel based on the altitude information read in S11 (S13: terrain model creation means). In the primary incident light creation unit 134, S11
Using the elevation information read in step S12, the imaging conditions read in step S12, and the terrain model created in step S13, a primary incident light that sufficiently considers the effect of multiple scattering of light on the surrounding terrain is created by Monte Carlo simulation. (S1
4: Simulation of primary incident light).

Here, a procedure for creating the primary incident light, which fully considers the influence of multiple scattering of light on the surrounding terrain by using Monte Carlo simulation, will be described with reference to FIG.
First, the altitude information is input (S101), the imaging conditions are read (S102), and the terrain model is input (S103).
The primary reflection position is determined (S104). Next, a predetermined number of photons are generated (incident) by random numbers from the upper surface of the atmosphere according to the sunlight incident angle which is an imaging condition (S105). Next, it is determined whether or not the number of photons generated exceeds a preset number N (natural number) (S106). When the number is equal to or less than the set number N, a free travel distance, that is, a movement distance of photons is calculated (S10).
7) Then, the end point coordinates of the photon are determined (S108). The position of the determined end point coordinates is determined (S109), and if the position is the ground surface, the area that affects the incident light is calculated (S110), and the incident judgment is made on whether the incident light is blocked by the topography of the area. Is performed (S111). If incident, the number of photons is counted (S112), and the process returns to S105. In S109, if the end point coordinate position is the upper surface of the atmosphere, the process returns to S105. If the end point coordinate position is in the atmosphere, it is determined whether it is absorption or scattering (S113), and if it is absorption, the process returns to S105. In the case of scattering, the scattering angle is calculated (S114), and the process returns to S107. S10
When the number of photons exceeds the set value N in 6, the primary incident light generation rate is calculated from the ratio between the number of photons generated and the number of photons counted (S115).

Here, a method of calculating a region affecting incident light (S110) and a method of determining whether or not photons are incident on the ground surface (S111) will be described. The altitude of the primary reflection position is y, the maximum value of the altitude on the earth is Ymax, the zenith angle of the primary incident light is θ (rad), and the azimuth angle is φ (rad). However, the azimuth shall be the angle measured clockwise from true north. If the elevation of an arbitrary ground surface is v and the horizontal distance between the ground surface and the primary reflection position is u, the ground surface in the direction of φ that satisfies the following expression (1) is the affected area in this embodiment.
Further, it is assumed that the photon is incident when the equation (2) holds for u shown in the equation (1).

[0021]

## EQU1 ## u <(Ymax-y) × tan θ (1)

## EQU00002 ## v <tan.theta./u (2)

The primary reflection determining section 135 determines whether or not the primary incident light calculated in S14 is reflected by using the reflectance of the ground surface (S15: primary reflection determining means). By the above processing, the primary reflected light on the ground surface can be obtained with high accuracy.

FIG. 4 is a block diagram of an image information processing apparatus according to an embodiment of the second invention, showing an example of an apparatus for reproducing the state of creating secondary reflected light of light on the atmosphere-ground surface. . In FIG. 4, 21 is an external device, 22 is an external input device, 2
3 is a secondary reflected light producing device, and 24 is an output device. The secondary reflected light creation device 23 includes an altitude reading unit 231, an information storage unit 232, a reflection distance calculation unit 233, a terrain model creation unit 234, a secondary incident light creation unit 235, and a secondary reflection determination unit 236. .

The external device 21 is, for example, an MT that stores altitude information in advance, an external storage device, or the like, and inputs the altitude information of the area corresponding to the image to the secondary reflected light creating device 23. The external input device 22 is, for example, a keyboard or the like, and inputs image capturing conditions to the secondary reflected light creation device 23. Instead of the keyboard, it is also possible to use an MT that stores imaging conditions in advance, an external storage device, or the like. The secondary reflected light creation device 23 creates secondary reflected light using the altitude information input from the external device 21. This will be described later. As the output device 24, a CRT display device, a printer, a computer storage device or the like is used.

Next, with reference to FIGS. 5 and 6, the operation of the secondary reflected light producing apparatus 23 having the above-mentioned configuration will be described. 5 is a flowchart showing a processing procedure of the secondary reflected light creating device 23, FIG. 6 is a flowchart showing a processing procedure of the secondary incident light creating unit 235, and S represents each processing step.

The altitude information input from the external device 21 is read by the altitude reading unit 231 and converted into information suitable for subsequent processing, for example, the altitude of each pixel of the image (S).
21: elevation information input means). In addition, the external input device 2 is previously
The image pickup condition stored in the information storage unit 232 is read from No. 2 (S22: image pickup condition input means). The image capturing conditions include all data relating to the image capturing state such as image resolution, image sensor detection wavelength, atmospheric condition, sun position, maximum altitude value and minimum altitude value on the earth at the time of image capturing. . In the reflection distance calculation unit 233, S21 and S2
Information suitable for post-processing is calculated by calculating the distance at which the secondary reflected light is reflected from the altitude information read in 2 and the imaging conditions (maximum altitude value and minimum altitude value on the earth at the time of image capturing, image resolution) , For example, the number of pixels (S23: reflection distance calculation means).

Here, a method of calculating the reflection distance will be described. Ymax is the maximum value of the altitude on the earth at the time of image capturing
, The minimum value is Ymin, the image resolution (distance of one pixel) is x, the reflection distance (horizontal distance) of the secondary reflected light is u, the elevation of the secondary reflection position is v, the elevation difference at one pixel of the shooting area Is at least y, the minimum value of u when the following expressions (3) and (4) are both satisfied is defined as the reflection distance.

(3) (Ymax-v) <u · y / x (3)

## EQU00004 ## (v-Ymin) <u.y / x (4) When the equations (3) and (4) are modified, the equations (5) and (5) are obtained, respectively.
It becomes like (6).

## EQU00005 ## u> (Ymax-v) .x / y (5)

## EQU00006 ## u> (v-Ymin) .x / y (6)

In the terrain model creation section 234, the terrain model necessary for the post-stage processing based on the altitude information read in S21,
For example, modeling of the inclination of the ground surface for each pixel is performed (S
24: topographic model creating means). Secondary incident light creation unit 235
Then, the altitude information read in S21, the imaging condition read in S22, the reflection distance calculated in S23, and S
Secondary incident light is created by Monte Carlo simulation using the terrain model created in 24 (S25:
Secondary incident light simulation).

Here, the procedure for creating the secondary incident light using the Monte Carlo simulation will be described with reference to FIG. First, the altitude information is input (S201), the imaging condition is read (S202), and the reflection distance is input (S20).
3) Input the terrain model (S204) and determine the secondary reflection position and the primary reflection position (S205, S).
206). Next, a predetermined number of photons are generated (incident) by random numbers between the primary reflection position and the secondary reflection position (S207).
When the number of photons generated is equal to or less than the preset number N (natural number) (S208), it is determined whether the secondary reflection position is reached from the primary reflection position (S209), and the number of photons that arrive is counted. (S210) The process returns to S207. Whether the photon reaches the secondary reflection position (S20
In 9), the judgment is made based on the presence or absence of the terrain that intercepts the straight line connecting the primary reflection position and the secondary reflection position. When the number of photons exceeds the set value N (S208), the secondary incident light generation rate is calculated from the ratio of the number of photons generated and the number of photons counted (S21).
1). This is repeated until the distance between the primary reflection position and the secondary reflection position becomes the reflection distance or more (S212).

The secondary reflection determining section 236 determines whether or not the secondary incident light calculated in S25 is reflected by using the reflectance of the ground surface (S26: secondary reflection determining means). By the above processing, the secondary reflected light on the ground surface can be quickly and accurately obtained.

FIG. 7 is a block diagram of an image information processing apparatus according to an embodiment of the third invention, showing an example of an apparatus for reproducing the state of radiative transfer of light between the atmosphere and the ground surface. In FIG. 7, 31 is an external device, 32 is an external input device, 33 is a radiation transfer light reproducing device, and 34 is an output device. The radiated transfer light reproduction device 33 includes an optical path luminance creation unit 331, a primary reflected light creation unit 332, a secondary reflected light creation unit 333, and an arrival rate calculation unit 33.
4 and the radiated transfer light calculator 335.

The external device 31 is, for example, an MT that stores altitude information in advance, an external storage device, or the like, and inputs the altitude information of the area corresponding to the image to the radiation transfer light reproducing device. The external input device 32 is, for example, a keyboard or the like, and inputs image capturing conditions to the radiated transfer light reproduction device 33. Instead of the keyboard, it is also possible to use an MT that stores imaging conditions in advance, an external storage device, or the like. Radiation transfer light reproduction device 33
Is to reproduce the radiated transmitted light by using the altitude information input from the external device 31 and the imaging condition input from the external input device 32. This will be described later. As the output device 34, a CRT display device, a printer, a computer storage device or the like is used.

Next, with reference to FIGS. 8 and 9, the operation of the radiated transfer light reproducing device 33 having the above-described configuration will be described. FIG. 8 is a flow chart showing the processing procedure of the radiated transfer light reproduction device 33, and FIG. 9 is a flow chart of a simulation for creating the optical path brightness or calculating the arrival rate of the reflected light, and S is the step of each processing. It represents.

The altitude information input from the external device 31 is obtained by the primary reflected light producing section 332 and the secondary reflected light producing section 3
It is read by 33 (S31: elevation information reading / converting means). The imaging conditions input from the external input device 32 are the optical path luminance creating unit 331 and the primary reflected light creating unit 33.
2, secondary reflected light creation unit 333, and arrival rate calculation unit 334
(S32: imaging condition reading means). The image capturing conditions include all data relating to the image capturing state such as image resolution, image sensor detection wavelength, atmospheric condition, sun position, maximum altitude value and minimum altitude value on the earth at the time of image capturing. . In the optical path luminance creating unit 331, S3
Optical path brightness is created by Monte Carlo simulation using the imaging conditions read in 2 (S33: optical path brightness simulation).

Here, the procedure for creating the optical path luminance using the Monte Carlo simulation will be described with reference to FIG. It should be noted that portions similar to the processing in FIG. 3 described above and general portions regarding the processing will be briefly described. First, the imaging conditions are read (S301) and the primary reflection position is determined (S302). Next, as in the case of FIG. 3, a predetermined number of photons are generated by random numbers according to the sunlight incident angle, which is an imaging condition, from the upper surface of the atmosphere, the free path distance is obtained, and the end coordinates of the photons are determined (S303 to S30).
6). If the position of the end point coordinate is the upper surface of the atmosphere, the number of photons is counted (S307 to S308), and the process returns to S303. If the end point coordinate position is the ground surface, S303 is directly executed.
If it is in the atmosphere, it is determined whether it is absorption / scattering (S3
09), if it is absorbed, the process returns to S303. If it is scattering, the scattering angle is calculated (S310), and the process returns to S305. Finally, the optical path luminance generation rate is calculated from the number of photons generated and the number of photons counted (S312).

In the primary reflected light producing section 332, the area (influence area) affected by multiple scattering in the terrain when photons are incident on the ground surface is determined from the altitude information read in S31 and S32 and the imaging conditions. Then, primary reflected light is created in consideration of multiple scattering of light on the terrain in this area (S34: primary reflected light creating means). In the secondary reflected light creation unit 333, S3
The secondary reflected light is created from the altitude information read in 1 and S32 and the imaging conditions (S35: secondary reflected light creating means). The arrival rate calculation unit 334 calculates the arrival rate of the surface cotton reflected light to the upper surface of the atmosphere by Monte Carlo simulation using the imaging conditions read in S32 (S3).
6: Arrival rate simulation).

Now, referring to FIG. 9 again, the procedure for calculating the reaching light using the Monte Carlo simulation will be described. First, input the imaging conditions (S301),
The primary reflection position is determined (S302). Next, a photon is generated by a random number from the primary reflection position in the direction of the zenith angle of 0 degree,
The free travel distance is calculated and the end coordinates of the photon are determined (S3
03-S306). If the position of the end point coordinate is the upper surface of the atmosphere, the number of photons is counted (S307 to S308). When the end point position is on the ground surface or in the atmosphere, each processing is performed (S307, S309 to S311). Finally, the arrival rate is calculated from the number of photons generated and the number of photons counted (S312).

In the radiated transmitted light calculation unit 335, S33, S
Radiation transfer light is calculated using the optical path luminance, the primary reflection light, the secondary reflection light, and the arrival rate created / calculated in S34, S35, and S36 (S37: Radiation transfer light calculation means). For example, the radiation transfer light on the upper surface of the atmosphere detected by the image sensor can be obtained by the following equation (7).

[0039]

Equation 7] J = (Np + N1 × T / π + N1 × N2 × T / π 2) × I ... (7) where, I: solar radiance, J: radiation is detected by the sensor luminance Np: the optical path luminance generation Rate N1: primary reflected light generation rate, N2: secondary reflected light generation rate, T: arrival rate to the upper surface of the atmosphere Through the above processing, the state of radiative transfer of light can be reproduced with high accuracy.

Needless to say, the present invention is not limited to the above-mentioned embodiments, and can be similarly implemented even if various modifications are made without departing from the gist of the present invention.

[0041]

As described above in detail, the image information processing apparatus according to the first aspect of the present invention uses the altitude information of the photographed area, the incident direction of the primary incident light, and the maximum altitude value on the earth for each of them. The effect of the surrounding topography is calculated for each primary incident light, the presence or absence of multiple scattering in this area is used as the effect on the primary incident light, the primary incident light is obtained, and the primary reflected light is created from this primary incident light. Because of the configuration, highly accurate primary reflected light can be obtained.

Further, the image information processing apparatus according to the second invention calculates the distance at which the secondary reflected light is reflected from the altitude information of the photographed area, the maximum and minimum altitude values on the earth, and the resolution of the image. However, since the secondary reflected light generated in the area (reflection area) within this range is used as the secondary reflected light in the atmosphere-ground surface simulation, the neighboring area is used more quickly than the method using the free path distance. The secondary reflected light can be obtained with higher accuracy than the method.

Furthermore, the image information processing apparatus according to the third aspect of the present invention is characterized by multiple scattering in the terrain in radiative transfer light reproduction.
Light that enters from the upper surface of the atmosphere and is reflected by the ground surface (primary reflected light)
Regarding, regarding the altitude information of the captured area and the imaging conditions,
When the photon is incident on the ground surface, the area (affected area) that is affected by the multiple scattering in the terrain is defined, and the multiple scattering of the light in the terrain in this area is considered as the secondary reflected light. It is possible to obtain the radiated transmitted light with higher accuracy compared to.

[Brief description of drawings]

FIG. 1 is a block configuration diagram showing a configuration of an embodiment of an image information processing apparatus according to a first invention.

FIG. 2 is a flow chart showing a method for producing primary reflected light in the apparatus for producing primary reflected light in the embodiment.

FIG. 3 is a flowchart of a simulation for creating primary incident light according to the same example.

FIG. 4 is a block diagram showing the configuration of an embodiment of the image information processing apparatus according to the second invention.

FIG. 5 is a flowchart showing a method of creating secondary reflected light in the device for creating secondary reflected light of the same embodiment.

FIG. 6 is a flowchart of a simulation for producing secondary incident light according to the same example.

FIG. 7 is a block diagram showing the configuration of an embodiment of an image information processing apparatus according to the third invention.

FIG. 8 is a flowchart showing a method of reproducing radiated transfer light by the radiated transfer light reproducing apparatus according to the embodiment.

FIG. 9 is a flowchart of a simulation for creating an optical path brightness or calculating a reflection light arrival rate according to the embodiment.

[Explanation of symbols]

 11, 21, 31 External device 12, 22, 32 External input device 13 Primary reflected light creating device 23 Secondary reflected light creating device 131, 231 Elevation reading unit 132, 232 Information storage unit 133, 234 Topographic model creating unit 134, 332 Primary incident light generation unit 135 Primary reflection determination unit 14, 24, 34 Output device 233 Reflection distance calculation unit 235, 333 Secondary incident light generation unit 236 Secondary reflection determination unit 33 Radiation transfer light reproduction device 331 Optical path luminance generation unit 334 Arrival Rate calculator 335 Radiation transfer light calculator

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Claims (3)

[Claims] 1. An image information processing apparatus that reproduces multiple scattering of light between the atmosphere and the ground surface when an image of the ground surface is taken from an artificial satellite or an aircraft by computer simulation, and captures the altitude information of the ground surface. Altitude information capturing means, imaging condition reading means for reading the imaging conditions of the image, terrain model creating means for creating a terrain model from the altitude information, peripheral area using the altitude information, the imaging conditions and the terrain model Primary incident light creating means for creating primary incident light on the ground surface in consideration of multiple scattering of light in the terrain, and primary reflection determining means for judging whether or not the primary incident light is reflected on the ground surface. An image information processing apparatus comprising: 2. An image information processing apparatus for reproducing multiple scattering of light between the atmosphere and the surface of the earth when an image of the surface of the earth is taken from an artificial satellite or an aircraft by computer simulation, and the elevation information of the surface of the earth is captured. Elevation information capturing means, imaging condition reading means for reading the image capturing conditions of the image, reflection distance calculating means for calculating a reflection distance of secondary reflected light from the altitude information and the imaging conditions, and a terrain model from the altitude information Topographic model creating means for creating a secondary incident light creating means for creating secondary incident light on the ground surface using the elevation information, the topographic model, the reflection distance, and the imaging conditions, An image information processing apparatus comprising: a secondary reflection determining unit that determines whether or not the next incident light is reflected by the ground surface. 3. An image information processing apparatus for reproducing the state of radiative transfer of light between the atmosphere and the surface of the earth when an image of the surface of the earth is taken from an artificial satellite or an aircraft by computer simulation. Altitude information capturing means for capturing the image capturing conditions, image capturing condition reading means for capturing the image capturing conditions of the image, optical path luminance creating means for generating optical path luminance from the image capturing conditions, and altitude information and the image capturing conditions in the surrounding area topography. Primary reflected light creating means for creating primary reflected light on the ground surface in consideration of the influence of multiple scattering of light, and secondary reflection for creating secondary reflected light on the ground surface from the altitude information and the imaging conditions. Light generation means; arrival rate calculation means for calculating the arrival rate of the ground surface reflected light to the upper surface of the atmosphere from the imaging conditions; the optical path brightness, the primary reflected light, and the second Reflected light, and the air from the delivery ratio - image information processing apparatus characterized by comprising a, a radiation transmitting light reproduction unit which reproduces the state of the radiation transmission of light at the ground surface.