JPH0447385A - Picture processing device - Google Patents

Abstract

PURPOSE:To perform an optimum depth queue processing in accordance with an application by providing a depth queue control circuit. CONSTITUTION:A depth queue control circuit 3 takes in the value outputted from a preprocessing part 1 at the timing of the output signal of a microprogram control circuit 5 and determines the presence or the absence of a depth queue and the depth queue processing mode, and the output is connected to an address selecting circuit 2 to switch the execution address of a microprogram. Thus, execution of depth processing for each independent graphic or all graphic on the display screen is selected in accordance with the application.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a raster scan type 3
The present invention relates to a dimensional image processing device.

[Prior Art] Depth cue processing is used to express the depth direction of a display in a three-dimensional image processing device.
Brightness changes were performed on the device coordinate system, which is the final coordinate system for display.

[Lesson 1 that the invention attempts to solve! ! ] With the above technology, when multiple independent figures are displayed simultaneously, the brightness is determined by the position of the independent figures in the device coordinate system, so depth cue processing cannot be performed for each independent figure, making it less flexible. It lacked sex.

[Means for Solving the Problems] In view of the above points, the present invention includes: a preprocessing unit that generates a command and data for a figure to be displayed; an address selection circuit that selects a process based on the command for the figure; A depth cue control circuit that controls a part of the selection circuit, a memory for storing a microprogram, a microprogram control circuit that controls the memory, and a depth cue processing circuit that performs depth cue processing based on the output of the microprogram control circuit. By having a depth cue control circuit, it is possible to select depth cue processing for each individual figure or for each displayed figure engraving.

[Operation] According to the above configuration, an application can selectively perform depth cue processing on each independent figure or on all figures on the display screen.

[Example] Embodiments of the present invention will be described below based on the drawings.

In FIG. 1, numeral 1 denotes a preprocessing unit that generates the type of line segment to be displayed and its coordinate values, and the output format is composed of a plurality of bits of commands and data.

An address selection circuit 2 selects an execution address of the microprogram storage memory 4 based on the output of the preprocessing section 12, and is composed of a memory, a selector, a register, and the like.

Reference numeral 3 denotes a depth cue control circuit which takes in the value output from the preprocessing section l at the timing of the output signal of the microprogram control circuit 5 and determines the presence or absence of depth cue and the depth cue processing mode based on the value. It is connected to the address selection circuit 2 and switches the execution address of the microprogram.

4 is a memory for storing a microprogram that determines the operation of the depth skew processing circuit 6, and outputs the output of the address selection circuit 2 to the microprogram control circuit 5 as an address.

Reference numeral 5 denotes a register for storing output data of the microprogram storage memory 4, which is read out sequentially according to the control clock, and its output is read out as a microprogram instruction.
The depth cue processing circuit 6 and the depth cue control circuit 3 are controlled.

Reference numeral 6 denotes a circuit that performs depth cue processing according to the output of the microprogram control circuit 5, and converts the coordinate values in the depth direction of the display into luminance.

FIG. 2 is a layout diagram of the memory of the address selection circuit 2. As shown in FIG.

Memory addresses are mapped as shown in the figure according to the depth cue processing method.

As a processing method, should depth cue be performed (depth cue 〇N) or not (depth cue processing ○FF)?
Normalized coordinate system (C or lower NDC) or device coordinate system (
The question is whether to perform depth cue processing on the DC (hereinafter referred to as DC).

FIG. 2 is a reference diagram, and it is also possible to add a depth skew correction mode, etc. This layout is largely mapped to the four layouts by the depth cue control circuit 3. FIG. 3 is a preferred explanatory diagram of depth cue processing.

This figure shows a case where figures 1 and 2 are defined in a world coordinate system (hereinafter referred to as WC), and the right side with respect to the W axis is closer to the viewpoint.

By converting the coordinates from WC to NDC, the coordinate values of the figure are normalized. Furthermore, when converted to DC corresponding to the display screen, figure 1 is positioned closer to the viewpoint than figure 2, similar to WC. Therefore, when depth cue processing is performed at DC, the Z value of each figure is converted to brightness as shown in B in the figure.

In other words, Zl and Z2 of figure 1 are converted to work 1 and ■2, respectively, and Z3 and Z4 of figure 2 are converted to work 3 and ■4, respectively, so figure l and figure 2 have different luminance, or brightness, even though they are the same front surface. .

On the other hand, when depth cue processing is performed in NDC, the brightness is converted as shown in A in the figure, so the front surface of figure 1 and figure 2 (Zl in terms of coordinate values).

23) has the same brightness. In other words, a depth cue is applied to each figure.

This is because in NDC, all figures are normalized from -1 to +1, and the values are subjected to brightness conversion.

[Effects of the Invention] As is clear from the above description, the present invention includes the depth cue control circuit, thereby making it possible to switch the depth cue processing and to perform optimal depth cue processing depending on the application.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing an embodiment of the present invention.
FIG. 3, a layout diagram of the memory of the address selection port n2, is a simple explanatory diagram of depth cue processing. Pre-processing unit Address selection circuit Depth skew control circuit Memory for storing microprograms Microprogram control circuit Depth skew processing circuit and above

Claims (1)

[Claims] a preprocessing unit that generates commands and data for graphics to be displayed; an address selection circuit that selects processing based on the commands for the graphics; a depth cue control circuit that controls a part of the address selection circuit; and a microprogram storage circuit. An image processing apparatus comprising: a memory; a microprogram control circuit that controls the memory; and a depth skew processing circuit that performs depth skew processing based on the output of the microprogram control circuit.