JPH0244395A - Picture display device - Google Patents

Abstract

PURPOSE:To execute the display at a high speed by deciding the timing for displaying a cross section or the timing for displaying an external form by depth information, and displaying the data which is read out of a memory provided separately at the time of the timing for displaying the cross section. CONSTITUTION:The title device is provided with an information register 6 for storing data for displaying a cross section and a depth information register 5 for storing depth information of a picture element for displaying a cross section separately, respectively, and also, provided with a selector 7 for switching data of an image memory 2 or data of the information register 6 by a result of comparison of data of a depth information memory 3 for displaying an external form and data of the depth information register 5. Accordingly, the timing for displaying the external form or the timing for displaying the cross section is decided, and at the time of the timing for displaying the external form, the data of the image memory is read out and displayed, and at the time of the timing for displaying the cross section, the data of the information register is read out and displayed, therefore, the display can be executed at a high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image display device for processing three-dimensional data and generating and displaying images.

[Prior Art] Conventionally, in a device that performs three-dimensional display, when attempting to display a cross-section of a part of a displayed figure, first, information for displaying the outline in three-dimensional form is stored in an image memory, and the information is sequentially read out. When the external shape is displayed and the monitoring result of the data read from the depth information memory indicates that the display position is where the cross section should be displayed, the data in the image memory is rewritten to the cross section display data, and it is read out and displayed. Ta.

[Problems to be Solved by the Invention] However, in such conventional devices, the display processor reads depth information from the depth memory, performs comparison, and rewrites the data in the image memory based on the comparison result, so that the display In addition, when changing the depth information for displaying a cross section, the entire image memory must be rewritten.

[Means for Solving the Problems] In order to solve such problems, the present invention provides an information register for storing data for displaying a cross section and a depth information register for storing depth information of pixels for displaying a cross section. Each is provided separately, and further provided with a selector that switches between data in the image memory and data in the information register based on a comparison result between the data in the depth information memory for displaying the external shape and the data in the depth information register.

[Operation] The data in the depth memory and the information in the depth information register are compared, and it is determined whether it is the timing to display the outline or the cross section. When it is the timing to display the outline, the image is Data in the memory is read out and displayed, and when it is time to display a cross section, data in the information register is read out and displayed.

[Embodiment] The figure is a block diagram showing an embodiment of the present invention. In the figure, a display processor 1 writes data for three-dimensional display of the external shape into an image memory 2, and writes three-dimensional information for that pixel, that is, depth information, into a depth memory 3. When the writing is completed, the data is stored in the image memory 2. The written information is sequentially read out pixel by pixel by the display control circuit 4. When displaying the outline, no information is written in the depth information register 5, so the comparator 8 does not generate an output signal, and the selector 7 outputs an image when no output signal is supplied from the comparator 8 It is configured to supply data read from the memory 2 to the display 9. Therefore, the external shape is displayed on the display 9.

When displaying a cross section, image information for displaying the cross section in three dimensions is written into the information register 6, and depth information of pixels for displaying the cross section in three dimensions is stored in the depth information register 5. Then, the display control circuit 4 sequentially reads information from the image memory 2 and displays the outline. At this time, the comparator 8 compares the data in the depth memory 3 and the data in the depth information register 5, and if the depth information read from the depth memory 3 is smaller, it supplies a "1" level signal to the selector 7. do. When this signal is supplied to the selector 7, the information for displaying the cross section stored in the information register 6 is selected.6If the depth information from the depth memory 3 is greater, the comparator 8 outputs "0". A level signal is supplied to the selector 7. At this time, data read from the image memory 2 is supplied to the display 9.

Therefore, initially, the outline is displayed, and when the outline continues to be displayed and a cross-section display position is reached, this is determined from the comparison result of the depth information, and the displayed image becomes a cross-section. For this reason, the outline is displayed for a certain part, and the cross section is displayed for the rest of the part. In this way, there is no need to rewrite the data in the image memory for the cross section, so high-speed display can be achieved.

In addition, in the above embodiment, the data in the depth memory and the data in the depth information register are compared, and the cross section is displayed when the data in the depth memory is smaller. A cross-sectional display may be performed when the value is large.

[Effects of the Invention] As explained above, the present invention provides a separate register for cross-section display, determines whether it is the timing to display the cross-section or the outline based on depth information, and determines when it is the timing to display the cross-section. Since data read from a separately provided memory is displayed, there is no need to rewrite the contents of the pixel memory when displaying a cross section, and this has the effect of allowing high-speed display.

[Brief explanation of the drawing]

The figure is a block diagram showing one embodiment of the present invention. 1... Display processing processor, 2... Image memory, 3... Depth memory, 4... Display control circuit, 5
．． 6...Register, 7...Sexy evening, 8...Comparator, 9...Display device.

Claims (2)

[Claims] (1) An image display device that displays a three-dimensional image on a display device includes an image memory in which information for displaying a certain pixel in three dimensions is written, and a depth information memory in which depth information for displaying that pixel in three dimensions is written. , an image register that stores information for displaying a 3D cross section of a certain pixel, a depth information register that stores depth information of a pixel that displays a 3D cross section, and a depth information register that stores the data read from the depth memory. When the detection signal is output from the comparator, the data in the information register is output to the display, and when the detection signal is not output, the data in the image memory is output to the display. An image display device comprising: a selector that outputs an output to the image display device. (2) An image display device that displays a three-dimensional image on a display device includes an image memory in which information for displaying a certain pixel in three dimensions is written, and a depth information memory in which depth information for displaying that pixel in three dimensions is written. , an image register that stores information for displaying a 3D cross section of a certain pixel, a depth information register that stores depth information of a pixel that displays a 3D cross section, and a depth information register that stores the data read from the depth memory. A comparator that generates a detection signal when the detection signal is greater than the data of An image display device comprising: a selector that outputs an output to the image display device.