JPH0660189A - Preparing method for picture having sense of same material in picture processing - Google Patents

Abstract

PURPOSE:To simply prepare a picture having a sense of a type of material in a short period time by calculating the lightness of a color picture having an optional sense of type of material so as to reduce remarkably calculation parameter for preparing the picture. CONSTITUTION:A mean value of lightness of all picture elements in a color picture is obtained by using the color picture having an optional sense of type of material inputted from a picture input means 1 to prepare a lightness table 13 having a relative value between the lightness of all the picture elements of the color picture and the average value of the lightness. As to each picture element of the picture to be generated, the picture is formed by giving the color obtained through the addition of the relative value of the lightness of the designated optional color to a position of each picture element. Thus, when the color picture having an optional sense of type of material is prepared, the calculation parameter is eliminated remarkably simply in a short period of time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of creating images with the same material appearance in image processing.

[0002]

2. Description of the Related Art Conventionally, a method of creating an image having the same material appearance in this type of image processing by a computer is
It was a method of creating an image by calculation based on texture information such as brightness, unevenness, reflection characteristics, direction of normal line, and color sense coefficient of material.

[0003]

The above-mentioned conventional method of creating an image having a material appearance in image processing includes material appearance information such as color, brightness, unevenness, reflection characteristics, normal direction, material coefficient, and the like. Since the calculation needs to be performed independently, the calculation process for image creation becomes complicated and the image creation process takes a long time.

In view of the above points, the object of the present invention is to eliminate the above-mentioned drawbacks and calculate the lightness of a color image having an arbitrary material appearance, whereby the calculation parameters are largely deleted, and an image having the same material appearance is obtained. The point is that it can be created easily and in a short time.

[0005]

The method of creating the same material appearance image in the image processing of the present invention uses a color image having an arbitrary material appearance input by the image input means, and uses the brightness of all pixels in the color image. Is calculated, each pixel is converted and displayed in a specified arbitrary color while preserving the relative brightness, and an image having the same material appearance as a color image having an arbitrary material appearance is created.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. FIG. 6 is a block diagram showing a configuration of an example of a method of creating an image having an arbitrary texture in image processing.

The method of creating an image having an arbitrary material appearance in the image processing of this embodiment is performed by an image input means 1 for inputting an image having an arbitrary material appearance, and image data input by the image input means 1. Also, an image storage means 2 for storing data in the course of processing by the image processing means 3 and data of processing results, an image processing means 3 for processing an image input by the image input means 1, and a processing by the image processing means 3. The image display means 4 for displaying the image in the process and the image of the processing result.

Among these, the brightness calculation means 31 of the image processing means 3 is based on the intensity of the three primary colors (R, G, B) for all pixels of the color image input by the image input means 1, and the hue related to the Munsell color display.・ Brightness / Saturation (H ・ V ・ C)
Is calculated for each pixel, and the average value Vm is further calculated for all pixels having only brightness. Here, the brightness V for each pixel,
A lightness table 13 is obtained in which the difference ΔV from the average value Vm of lightness for all pixels is obtained. Next, for each pixel to be created, an image creating means 32 is provided which converts the specified arbitrary color using the relative value of the brightness of the brightness table 13 created by the brightness calculating means 31 and displays the converted color. The contents of this conversion are executed by adding ΔV to the brightness Vs for each pixel shown above. At this time, Vs + ΔV is 0-10 because it is Munsell display, so Vs + ΔV
When the value becomes 0 or less, 0 is set, and when the value becomes 10 or more, 10 is set. Therefore, Vs + ΔV
Is the three primary colors (R.
G / B) 's Munsell display (H, V, C) value for each pixel, added with ΔV for each pixel, and converted again to display of three primary colors (R, G, B), CRT, etc. If it is displayed with, a color image having an arbitrary texture can be obtained. Next, an operation of the method of creating an image having a material appearance in the image processing of the present embodiment configured as described above will be described. Note that, here, in the case where a process of creating an image having an arbitrary material appearance as shown in FIG. 2 (processing of creating an image having the same material appearance as the reference material appearance image 11 having a certain material appearance) is performed. The operation will be described.

The image input means 1 inputs an image having a reference material appearance. From the image input means 1, the reference material appearance image 11
In the image processing means 3 which has received, the following processing is performed. That is, the lightness calculation means 31 obtains the average value of the lightness of all the pixels in the reference material appearance image 11, and creates the lightness table 13 having the relative value of the lightness of all the pixels in the reference material appearance image 11 and the average value thereof. (The brightness table 13 is stored in the image storage means 2). Image creation means 3
Reference numeral 2 denotes a color obtained by adding, for each pixel of an image to be created, the lightness of an arbitrary designated color to the lightness pair of the lightness table 13 created by the lightness calculation means 31.
The image 12 created at the position of each pixel is displayed on the image display means 4.

According to the above-described image creation processing, the brightness of a color image having an arbitrary material appearance is calculated, so that the calculation parameters are greatly reduced, and the image creation with the same material appearance can be simply and quickly performed. Can be done in time.

[0012]

As described above, according to the present invention, a color image having an arbitrary texture is used, the brightness of all pixels in the color image is calculated, and each pixel is designated while preserving the relative brightness. By converting and displaying in any color
There is an effect that the calculation parameters are significantly reduced, and an image having the same texture as a color image having an arbitrary texture can be easily created in a short time. Especially when the present invention is used in the field of computer graphics, the above results can be remarkably exhibited.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is an explanatory diagram for explaining an operation of a method for creating a material appearance image in the image processing shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 image input means 2 image storage means 3 image processing means 4 image display means 11 reference material appearance image 12 created image 13 brightness table 31 brightness calculation means 32 image creation means

Claims (1)

[Claims] 1. A color image having an arbitrary material appearance input by an image input means is used to calculate the lightness of all pixels in the color image, and an arbitrary color in which each pixel is designated while preserving the relative lightness. A method of creating an image with the same material appearance in image processing, which comprises converting and displaying with, and creating an image having the same material appearance as a color image having an arbitrary material appearance.