KR20040041488A - Graphic user interface for color assignment of volume rendering image - Google Patents

Abstract

PURPOSE: A graphic user interface providing method for designating a color of a volume rendering image is provided to quickly and accurately grasp a structure by designating a set of colors previously selected through a test once. CONSTITUTION: When a user changes a color expressed as an opacity transition function, the user selects the opacity transition function by a mouse. A window is provided for selecting a color map, capable of being applied to the selected opacity transition function, which is a set of previously stored colors. If the color map is selected on the provided color map selection window, a volume rendering image is illustrated by a changed color using the selected color map and pixel values.

Description

Graphic user interface for color specification of volume rendering images {Graphic user interface for color assignment of volume rendering image}

The present invention relates to a method for providing a graphical user interface for showing three-dimensional data using volume rendering, and more particularly, to a method for specifying a color of an opacity transition function for volume rendering.

In general, volume rendering is a method of rendering 3D data into an image close to an actual structure using an opacity transition function and drawing it on the screen. The opacity transition function contains information about the opacity and color of data values. In general, opacity information can be easily adjusted by the user using a mouse on a graphical user interface. However, there is no convenient way to change the color.

1 is a schematic shape of a conventional opacity transition function. As shown in FIG. 1, when three-dimensional data is typically represented by volume rendering, an opacity transition function is displayed together with a histogram indicating a frequency of occurrence of density values of three-dimensional data pixel values.

The conventional method of assigning color to such an opacity transition function is to specify one color for the entire opacity transition function, select a color by selecting each line of the opacity transition function, or assign a color to each control point of the opacity transition function. When one color is assigned to the entire transition function, the distinguishing power of the illustrated image is inferior, and when the color is individually assigned to the lines or control points of the transition function, selection is cumbersome, and each of the selected colors is not harmonious. It must go through several trials and errors.

Therefore, the present invention is to solve these conventional problems, the user can specify the color of the image quickly and conveniently, the color of the image shown is harmonized and excellent in discrimination, the set of colors combined through the test on the program It provides a graphical user interface for pre-storing to allow the user to choose one of the saved and provided combinations when specifying the color of the opacity transition function.

1 is a diagram showing a general histogram and an opacity transition function.

2 is a diagram illustrating a graphical user interface for a general volume rendering image.

FIG. 3 is a diagram illustrating only an area of a histogram window in which an opacity transition function is displayed on the graphical user interface of FIG. 2.

4 to 6 are diagrams for explaining the colormap selection according to the present invention.

A method for providing a graphical user interface for a volume rendering image for realizing the above object of the present invention is a graphical user interface for a volume rendering image displaying a histogram indicating a frequency of occurrence of a density value of a 3D data pixel value. When you want to change the color represented by the opacity transition function,

(a) the user selecting the opacity transition function with a mouse;

(b) providing a window for colormap selection that is a set of pre-combined and stored colors applicable to the opacity transition function selected in step (a);

and (c) if a color map is selected in the color map selection window provided in step (b), displaying the changed color using the selected color map and pixel values.

Here, in the step (a), it is preferable to provide a method of selecting an opacity transition function by double-clicking or right-clicking a mouse button or clicking an opacity transition function selection icon at a point within the opacity transition function.

In addition, it is preferable that a color map, which is a set of pre-combined and stored colors of step (b), is provided when the program is installed, and the user can arbitrarily create and store a combination of colors.

In addition, when selecting a color map in the color map selection window of step (c), it is preferable to provide a preview screen according to the color map selection.

Next, a method of designating a color represented by an opacity transition function using a graphical user interface for a volume rendering image according to the present invention will be described in detail.

2 is an example of a graphical user interface for a volume rendered image.

FIG. 3 illustrates only an area of a histogram window in which an opacity transition function is displayed in FIG. 2. As shown in FIG. 3, the opacity transition function is typically displayed in the form of a trapezoid, so that the user can adjust the width and inclination through a mouse operation.

When the user selects the "Load ColorMap" term in the menu window of Fig. 4, which is displayed by double-clicking or right-clicking at a point in the trapezoid, the user selects the "Load ColorMap" term. Window appears. Looking at the preview on the right side of this new window, selecting a colormap and pressing the "Ok" button will show the screen with the changed color using the selected colormap.

FIG. 6 illustrates the image of FIG. 2 in a color changed using the color map selected in FIG. 5.

As described above, according to the present invention, when the user specifies the color of the opacity transition function, the combination of the preselected colors can be specified at a time through a test, so that the combination of colors with excellent discrimination and harmony can be easily specified, so that the user can quickly and accurately Identify structures.

Claims (4)

In the graphical user interface for a volume rendering image displaying a histogram indicating the frequency of occurrence of density values of three-dimensional data pixel values, when the user wants to change the color represented by the opacity transition function, (a) the user selecting the opacity transition function with a mouse; (b) providing a window for colormap selection that is a set of pre-combined and stored colors applicable to the opacity transition function selected in step (a); (c) if a color map is selected in the color map selection window provided in step (b), showing the changed color using the selected color map and pixel values; Method for providing a graphical user interface for rendering a volume comprising a. The method of claim 1, A method of providing a graphical user interface for volume rendering, which provides a method of selecting an opacity transition function by double-clicking or right-clicking a point in the opacity transition function or clicking an icon for selecting an opacity transition function. . The method of claim 1, A color map, which is a set of pre-combined and stored colors, is provided when the program is installed, and has a function of allowing a user to arbitrarily create and store a combination of colors. The method of claim 1, The color map selection window provides a preview screen according to the color map selection method for providing a graphical user interface for volume rendering.