JP2880722B2 - Model construction method based on drawing data - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Industrial application field) The present invention is a general-purpose software model corresponding to a drawing, a block diagram, a flowchart, etc., from various drawings expressed on paper. Alternatively, the present invention relates to a model building method based on drawing data for building a database on a computer.

(Conventional technology) Computer-based design and modeling technology (CAD / CAM)
In the field of (1), various means have been proposed for constructing a computer-processable database or software model from existing design drawings, flowcharts, and the like that exist only on ordinary paper. These databases and models usually have a hierarchical data structure in order to efficiently represent a large amount of information contained in the original drawing, but such a model having a complicated hierarchical structure is often used. As a construction method, create a library representing high-order data structures and symbols corresponding to the type of drawing to be modeled in advance, and use this library to create hierarchically lowest model elements or databases corresponding to specific drawings. It is common to create items.

(Problems to be Solved by the Invention) In the conventional software model construction method as described above, basically, a hierarchical data structure is constructed in a top-down manner from a higher-order element to a lower-order element. You must create a library that expresses Generally, this library is created based on the knowledge and textbooks of experts who are familiar with the target drawing, but this work is troublesome and at the same time, the structure of the library created in this way is insufficient. If there is a point, there is a problem that the model itself created using the library cannot correctly represent the information included in the original drawing. Also, when an existing drawing is modeled or made into a database, it is usually required that it be as close as possible to the original drawing in terms of expression. Since it is necessary to create something close to the actual drawing using the library that exists in the library, in the case of human operation, it takes a lot of time to adjust the position and size of the symbol, Even when used, there are many technical issues to be solved in terms of recognition of symbols on drawings and correspondence with symbols on libraries.

The present invention has been made to solve the above technical problem, and its purpose is to construct a high-order data structure corresponding to a library from a drawing model and at the same time to construct a model completely equivalent to the input drawing in terms of expression. The object of the present invention is to provide a model construction method based on drawing data to be used.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, a model construction method based on drawing data of the present invention uses a drawing such as a design drawing or a block diagram realized on a normal paper. Reading a simple digital image data by an image input device or the like; a model lower element creating step of creating a model lower element by designating an image range of the read digital image data; and The method further comprises a model upper element creating step of assembling to create a model upper element, and an attribute data input step of inputting attribute data of the created model lower element and model upper element. In the attribute data input step, the model lower element and the model upper element construct a hierarchical data structure in which common attribute information is inherited from the model upper element. It is characterized in that a software model having various hierarchies is constructed in a bottom-up manner from a model lower element of the hierarchy to a model upper element.

(Operation) According to the present invention, it is easy to construct a model having a complicated hierarchical structure in creating a model or a database on a computer based on a drawing expressed on an existing paper.
In addition, the use of an appropriate hierarchical structure enables efficient input of a large amount of information. Further, a model having image information completely equivalent to an existing drawing can be constructed.

(Example) An example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention.
As shown in the figure, the hardware configuration used in the model construction method of the present invention is composed of a computer main body (CPU) for executing processing.
1. A large-capacity storage device 2 for storing a constructed model, an image input device (image reader) 3 for reading an existing drawing as image data on a computer, a CRT 4 for displaying image data, and a range on a screen. An auxiliary input device 5 such as a mouse for inputting data through a screen or a screen.

As shown in FIG. 2, in terms of software (program), an image data reading function (reading step) 10 for loading drawing data as digital image data into a computer by the image input device 3 to select an arbitrary range from the image data. Image range specification with a function to handle as cut data, a function to generate a set of data corresponding to model elements or database items, model lower element creation function (model lower element creation step) 11, attribute data of this model A model element aggregate operation / model upper element creation function (model upper element creation step) 12 having a function of adding or deleting arbitrary information including the image data, providing a hierarchical relationship between a plurality of model elements. Model element attribute information that has the function of inheriting attribute information from upper elements to lower elements Force function consists (attribute data input step) 13 or the like.

Among these functions, the functions of a general-purpose image processing program can be used for processing image data, and the functions of a general-purpose relational database program can be used for functions related to model elements.

Next, a model construction method based on drawing data according to the present invention will be described with reference to FIGS.

(1) First, a design drawing or the like on the paper is converted into digital image data by the image input device 3 and displayed on the computer 1 and the CRT 4.

(2) Next, a range to be recognized as a model element in a specific figure or area in the drawing is designated using the auxiliary input device 5 such as a mouse. Simultaneously with the designation of the range, a new model element or database item is generated in the computer 1, and position information of the designated range and a copy of image data within the range are stored as attribute information.

(3) The drawing data input by repeating the above process 2 is converted into a software model composed of a plurality of elements while being completely equivalent to the original drawing on the screen.
However, the models constructed by the processes (1) to (3) are hierarchically flat, and at this stage, each model element contains only information on the image.

(4) Next, a set of elements is defined by sequentially designating elements belonging to the same group (for example, valves, pumps, etc. in the case of a piping diagram) on the screen. By this operation, in the model or the database, the elements corresponding to the set are generated, and are hierarchically positioned as the higher elements of the elements in the set. Also, by generating image information equivalent to the lower element, the existence of the higher element can be recognized on the screen, and a higher element can be recursively created by a similar set operation. At this time, in this method, the lower element can inherit the attribute information from the element according to the hierarchical structure. Actually, since no information has been inherited yet, even if an operation such as multiplex generation or deletion of an upper element is performed, no inconvenience occurs in a lower model element.

(5) By repeating the above operations 1-4, a model having a complicated hierarchical structure is built from the lower element to the upper element of the model on the basis of the input image data, contrary to the conventional model building method. It becomes possible. In addition, by defining an appropriate hierarchical structure for the model in this way, by adding detailed attribute information to each element using the inheritance relationship from the upper element to the lower element, large amounts of data can be efficiently used. Can be entered manually.

FIG. 3 shows an example of a CRT operation and data construction image in a computer according to the present embodiment. by the way,
In the above-described embodiment of the present invention, an example has been described in which the lowermost model element is first created, and then the set operation is performed to create the upper element. However, the lower model element is created by selecting and creating the same type of model element. And the operation of creating the upper element by the set can be performed at the same time. Although the case where model construction is performed only by the present invention has been described above, by combining with a conventional modeling method, a model having a hierarchical structure is created according to the present invention, and then an existing library is used for higher-level elements. It is also possible to implement by a method of inputting attribute information or, on the contrary, a method of separating a higher-order structure created by the present invention from a model and creating a conventional library.
Further, in the present invention, as the upper element and the lower element in the hierarchy, those which are completely equivalent in data structure can be used. Therefore, structurally, a plurality of models created in the present invention are hierarchically combined. Is also possible.

[Effects of the Invention] As described above, according to the present invention, when a model or a database on a computer is created based on a drawing expressed on an existing paper, a model having a complicated hierarchical structure is constructed. It is easy and efficient input of a large amount of information becomes possible by using an appropriate hierarchical structure.
Further, there is an effect that a model having image information completely equivalent to an existing drawing can be constructed.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a functional block diagram for explaining the operation of the present invention, and FIG.
It is a figure showing the operation on T and the data construction image in a computer. DESCRIPTION OF SYMBOLS 1 ... CPU 2 ... Storage device 3 ... Image input device 4 ... CRT 5 ... Auxiliary input device

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G06F 17/50 G06T 1/00

Claims (3)

(57) [Claims] 1. A reading step of reading a drawing such as a design drawing or a block diagram realized on a normal paper as simple digital image data by an image input device or the like, and specifying an image range of the read digital image data. Model lower element creating step of creating a model lower element by creating a model lower element, a model upper element creating step of collecting the created model lower element to create a model upper element, and attribute data of the created model lower element and model upper element And an attribute data inputting step of inputting a model data. 2. In the attribute data input step, the model lower element and the model upper element construct a hierarchical data structure that inherits common attribute information from the model upper element. A model construction method based on the drawing data described in the range (1). 3. The attribute data input step, wherein a software model having a complicated hierarchy is constructed in a bottom-up manner from a model lower element of the hierarchy to a model upper element. 1) A model construction method based on the described drawing data.