JP4556530B2 - Reform simulation program - Google Patents

Description

  A program for reflecting a shadow on an outer wall in consideration of the direction of a light source that hits the outer wall of a building

  When trying to simulate the renovation of the outer wall of a house, the position of the light source in the photograph cannot be calculated conventionally. Therefore, when processing a photograph, the position of the light source is always assumed and shadows are created to create a sense of reality. It was necessary to put out. However, it was difficult to automate the work, and it was always a manual work and was troublesome.

  For example, even if a new outer wall is attached to the outer wall of the photograph of FIG. 5 as shown in FIG. Therefore, the presence of shadows increases as shown in FIG. 7, but it is very troublesome to manually specify individual shadows.

Japanese Patent Application Laid-Open No. 8-146484 discloses an invention that automatically sets shooting conditions by predicting the state of a shadow generated during shooting based on the incident direction of light from a light source and the intensity of light. Kaihei 10-74036 discloses an invention in which the appearance of a building to be repaired is photographed, the photographed data is processed by a computer, and the processed data is presented to a customer to proceed with exterior wall repair. However, there is no disclosure of a technique that adds a shadow to the outer wall to create a sense of reality.
JP-A-8-146484 JP-A-10-74036

  In view of the above points, an object of the present invention is to automate the operation of finding a position of a light source (sunlight) that hits a building and shadowing the outer wall when simulating the reformation of the outer wall of a house.

According to one aspect of the present invention, when the first surface of the building displayed on the screen of the computer is replaced with the second surface, the first surface is formed by light projected from the light source onto the building. The direction of the light source is calculated from the difference in brightness between the sun part and the shadow part, and the brightness reflected on the sun part and the shade part of the second surface based on the direction of the light source obtained by the calculation. And the calculated brightness is reflected in the sun and shade portions of the second surface.

  Since there is no individual manual work as in the prior art, and the user only specifies the sun and shade, the renovated outer wall is shaded, which makes it easier to simulate the renovation of the outer wall of the house. Moreover, the calculation which adds a shadow can be easily performed only by designating two places in the sun and two places in the shade. In addition, it is possible to easily calculate the shadow according to the direction of any sun.

  FIG. 1 is a configuration diagram of an embodiment of the present invention. The surface selection unit 1 is a processing unit that stores a wall (surface) of a building selected by the user. The sun and shade selection unit 2 allows the user to select a portion of the sun that hits the sun and a portion of the sun that does not hit the sun from the wall (surface) of the building selected by the surface selection unit 1. A processing unit for storing. The direction calculation unit 3 is a processing unit that calculates the direction of the light source. The brightness calculation unit 4 is a processing unit that calculates the degree of brightness reflected on the wall (surface) selected based on the calculated direction. The degree of brightness refers to an amount that increases the brightness of a wall that is exposed to sunlight and an amount that decreases the brightness of a wall that is not exposed to sunlight. The reflection processing unit 5 is a processing unit that reflects the calculated brightness level on the selected wall (surface).

  The present embodiment will be described with reference to a flowchart (FIG. 4) taking the photograph of FIG. 2 as an example.

  When two orthogonal planes (here, plane A and plane B) of the building displayed on the computer screen are selected by the user, plane selection unit 1 stores the selected plane (S1).

  Next, when the sun parts p 'and q' which are shaded with the sun parts p and q where the sun hits the A and B faces are selected by the user, the sun part selecting unit 2 The color values of red R, green G, and blue B in the selected p, q, p ′, and q ′ are stored (S2) (FIG. 2).

Next, the direction calculation part 3 calculates a direction according to the following (S3). First, the selected sunny portion and shade portion are converted into a gray value I by the following equation.

The gray value of the shaded part on the A side and B side is almost the same, and the shaded shaded part is considered as a diffuse reflection component that affects the entire scene of the photo separately from the sunlight that is the light source, Subtract from the sunny part of the sun. Then, the solar light source direction is calculated from the difference between the subtracted values. That is, if the gray value at the p point is represented by Ip, the gray value at the q point is represented by Iq, the gray value at the p ′ point is represented by Ip ′, and the gray value at the q ′ point is represented by Iq ′, the light source direction θ is calculated by the following equation. The

  At this time, sunlight hits the B surface in FIG. 3 at an angle θ. On the other hand, sunlight hits the A surface at an angle of 90 ° −θ.

  Next, the brightness calculation unit 4 calculates the degree of brightness reflected on the A surface and the B surface based on the obtained light source direction θ according to the angle of the light source direction θ as follows ( S4).

  In the case of θ = 45 °, it is determined that the brightness is the same for both the A surface and the B surface, and the brightness level is not corrected.

  In the case of θ = 0 °, since sunlight hits the A plane vertically, a certain brightness (an arbitrary brightness degree S) is added to the A plane. A certain darkness (-S) is added to the B surface not exposed to sunlight.

  When θ = 90 °, since sunlight hits the B surface vertically, a certain brightness S is added to the B surface. A certain brightness (-S) is added to the A surface which is not exposed to sunlight.

In the case of θ <45 °, the A surface is more strongly exposed to sunlight than the B surface. At this time, the brightness level of the following equation is added to the A plane.

Moreover, the B surface is weaker than the A surface and is exposed to sunlight. At this time, the brightness level of the following equation is added to the B surface.

  In the case of θ> 45 °, the reverse of the case of θ <45 °.

  Finally, the reflection processing unit 5 reflects the calculated brightness degree S on the A side and the B side.

  In the present embodiment, the case where sunlight hits the walls of the building has been described. However, not only buildings but also objects such as arbitrary furniture may be in a state where sunlight or light from an arbitrary light source is applied.

(Appendix 1)
A surface selection unit that selects a surface that is exposed to light from a light source in an image displayed on a computer screen;
A partial selection unit that selects a sun part that is directly hit by the light from the light source and a shadow part that is not hit in the selected surface;
A direction calculation unit for calculating the direction of the light source from the brightness in the selected sun part and shadow part,
A brightness calculator that calculates the brightness reflected on the selected surface based on the calculated direction;
Reflection processing unit that reflects the calculated brightness on the selected surface,
Light source calculation program to function as. (1)
(Additional remark 2) The light source calculation program of Additional remark 1 which makes the said direction calculation part function further as a process part which designates two places from the said sun part, and two places from the said shadow part, and calculates the direction of a light source. (2)
(Supplementary Note 3) The direction calculation unit is a processing unit that designates two locations Ip and Iq from the sunny portion and two locations Ip ′ and Iq ′ from the shade portion and calculates the direction θ of the light source by the following equation The light source calculation program according to appendix 2, which further functions.
tan θ = (Iq−Iq ′) / (Ip−Ip ′)
(Supplementary Note 4) When the direction θ is 0 ° or 90 °, the reflection processing unit adds a certain brightness to the surface on which the light from the light source strikes, and the brightness on the surface on which the light does not strike. The light source calculation program according to appendix 1, 2, or 3, wherein the brightness is not corrected when θ is 45 °, and is further functioned as a processing unit for adding or subtracting the predetermined brightness when θ is otherwise . (3)
(Additional remark 5) The light source calculation program of Additional remark 4 which makes the said reflection process part function further as a process part which calculates the predetermined brightness in case the said direction (theta) is other by following Formula.
(45 ° -θ) / 45 ° × S
(Additional remark 6) The surface selection part which selects the surface which the light from a light source has hit in the image currently displayed on the computer screen,
A partial selection unit that selects a sun part that is directly hit by the light from the light source and a shadow part that is not hit in the selected surface;
A direction calculation unit for calculating the direction of the light source from the brightness in the selected sun part and shadow part,
A brightness calculator that calculates the brightness reflected on the selected surface based on the calculated direction;
Reflection processing unit that reflects the calculated brightness on the selected surface,
A light source calculator.
(Appendix 6) A surface selection step of selecting a surface that is irradiated with light from a light source in an image displayed on a computer screen,
A partial selection step of selecting, in the selected surface, a sun part that is directly hit by the light from the light source and a sun shadow part that is not hit;
A direction calculation unit for calculating the direction of the light source from the brightness in the selected sun part and shadow part,
A brightness calculation step for calculating the brightness reflected on the selected surface based on the calculated direction;
Reflection processing step to reflect the calculated brightness on the selected surface,
A light source calculation method comprising:

Diagram Hinata and shade specified on each wall Explanation of desired angle Flow chart of the present invention Original photo Image with outer wall pasted An image that takes into account the original shadow

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Screen selection part 2 Hinata shade selection part 3 Direction calculation part 4 Brightness calculation part 5 Reflection processing part

Claims (3)

In the building remodeling simulation program,
On the computer,
When the first surface of the building displayed on the computer screen is replaced with the second surface, the sun and shadow portions formed on the first surface by light projected from the light source onto the building . Calculate the direction of the light source from the difference in brightness , based on the direction of the light source obtained by calculation, calculate the brightness reflected in the sun and shade portions of the second surface,
A process of reflecting the calculated brightness on a sunlit portion and a shaded portion of the second surface;
A simulation program that executes In an information processing device that performs building remodeling simulation,
When the first surface of the building displayed on the screen of the information processing device is replaced with the second surface, a sunny portion and a shadow formed on the first surface by light projected from the light source onto the building A calculation unit that calculates the direction of the light source from the difference in brightness of the part and calculates the brightness reflected in the sun part and the shade part of the second surface based on the direction of the light source obtained by the calculation When,
Reflecting the calculated brightness on the sun and shade portions of the second surface;
An information processing apparatus comprising: In the building remodeling simulation method,
Computer
When the first surface of the building displayed on the computer screen is replaced with the second surface, the sun and shadow portions formed on the first surface by light projected from the light source onto the building . Calculate the direction of the light source from the difference in brightness , based on the direction of the light source obtained by calculation, calculate the brightness reflected in the sun and shade portions of the second surface,
The calculated brightness is reflected in the sun and shade portions of the second surface.
Reform simulation method.

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