JPH03191395A - Color image forming device - Google Patents

Abstract

PURPOSE:To update the display color data of all image points and to carry out smooth fading by reading out the data of each image point from a frame buffer and converting the read data into the display color data on a color look up table and displaying it. CONSTITUTION:A color image to be an object of fading and a color image or a monochrome image on the final stage are read out one by one image point successively, the display color data of each stage to be faded is obtained by a calculating means 9 successively. The fixed display color data is converted into an entry number through the use of the color look up table 8, and this entry number is stored in the frame buffer 11 successively. Then, the data stored in the frame buffer 11 is read out, reconverted into the display color data on a color look up table 8 to be sent to a display device 15, and emitted as a video. Thus, the display color data of all image points is updated on each stage of fading, so that smooth fading is carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a color image display device, and more particularly to a color image display device that can smoothly fade in or fade out a color image.

(Prior Art) In recent years, in microprocessor-based systems such as work stage machines, the demand for high-speed and diverse graphic processing has increased, and devices that can perform color drawing and display using the bitmap method have become widespread. ing.

When fading in/out a color image expressed based on digital information, conventional methods involve replacing some of the overall points (pixels) of the color image with the image to be displayed next. Method 1 is known. In this method, the entire image is faded in/fade out by sequentially increasing the ratio of points to be replaced from 0% to 100%.

Furthermore, as a second method, in a system having a color lookup table, there is a method in which the image is faded in/out by changing the values of the color lookup table.

(Problems to be Solved by the Invention) The first conventional method does not change the information of individual points on the entire screen from the original state to the next state, but changes the information on the entire point of the color image. Since the method involves replacing some of the points with the image to be displayed next, there was a problem in that the image could not be smoothly faded in/out. Particularly when the image has a detailed pattern, there is a problem in that the image becomes grainy during fading in/out, making it difficult to see.

In addition, in the second method, all the hues of the image displayed on the screen change, so on a multi-window system,
There was a problem in that it was not possible to fade in/fade out each individual window.

In addition, as a prior art related to the present invention, Japanese Unexamined Patent Application Publication No. 1986-
There are those described in Japanese Patent Application Laid-open No. 8695 and Japanese Patent Application Laid-Open No. 118188/1986.

An object of the present invention is to eliminate the problems of the conventional method, to be able to smoothly fade in/fade out an image, and to be able to fade in/fade out for each individual window on a multi-window system. The object of the present invention is to provide a color bitmap display method.

(Means and Effects for Solving the Problems) In order to achieve the above object, the present invention provides first and second memories in which a color image to be faded and a color image or a monochrome image in the final stage thereof are stored. means for sequentially reading data of each image point of both images from the first and second memories; arithmetic means for sequentially adding display color data for each stage of fade from the read data; a color lookup table that converts data and entry numbers; a frame buffer that sequentially stores the entry numbers of each point of the image at each stage converted by the color lookup table; and data of each image point from the frame buffer. The present invention is characterized in that it includes means for reading out the color data and converting it into display color data using the color lookup table, and means for displaying the display color data.

According to the present invention, the color image to be faded and the final stage color image or black and white image are sequentially read out one image point at a time, and the display color data at each stage of fading is sequentially read out by the calculation means. It will be done.

The obtained display color data is converted into an entry number by the color lookup table, and this entry number is sequentially stored in the frame buffer.

The data stored in the frame buffer is then read out, converted back into display color data using a color lookup table, and sent to a display device for display.

As a result, the display color data of all image points are updated at each stage of the fade, making it possible to perform a smooth fade.

(Example) The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a functional block diagram of an embodiment of the present invention. When fade-in/fade-out an image, prepare the original color image data in the first memory 5, and store the target color image data (hereinafter referred to as target color image data) that will be achieved as a result of fade-in/fade-out. Second
It is prepared in the memory 6 of. It is assumed that this color image data and target color image data are represented by entry numbers in a color lookup table. Note that the entry number of the color lookup table will become clear from the description below. Also, the thin lines in the figure are control commands,
Signals such as addresses are shown, medium thin lines show data expressed by entry numbers, and thick lines show display color data.

When there is an input from the input device 1 instructing execution of fade-in or fade-out, the input detection sensor w2 detects this human power and transmits it to the image display control means 3. The image display control means 3 sends a transfer control command (1) to the transfer device 4, and sends a fade stage parameter (2) indicating how many stages of fading to be performed to the display color selection device 7. For example, if the fade is to be completed in eight steps, this parameter is set to "8".

When the transfer device 4 receives the transfer control command (1), it sends the display point addresses (3) and (5) to the first memory 5 and the second memory 6. As a result, the first memory 5 and the second
From memory 6, color image point (1 pixel) data (4) of color image data and target color image data are stored.
, (6) are read out one by one.

Color image point data (4) and (6) read from the first memory 5 and the second memory 6 are sent to the display color selection device 7 as data (7) via the transfer device 4. The display color selection device 7 sends data (15), which is data equivalent to the data (7), to the color lookup table 8, searches it, and selects the color lookup table display color data (R) corresponding to this data (15). , GSB) (1B).

As shown in the figure, the color lookup table 8 includes entry numbers and corresponding display color data (
This is a table consisting of R, G, B), and in this embodiment, it is composed of a table with entry numbers θ to 255. In other words, this color lookup table 8 is 2
It consists of a table in which 56 display colors can be registered.

Display color data of color image points obtained in this way (
9) is sent to the arithmetic unit 9. This calculation bag f! At t9, calculations are performed to obtain display color data at each stage of the fade. An example of this calculation will be explained below.

The display color data of the image point of the original color image data is p1 The display color data of the image point of the target color image data is q,
Assume that the parameter (2) of the fade stage is n (n is an integer).

Display color data p and q can be expressed as follows when expressed using three colors RGB.

p-Cr1, gl, bl) q-(r2, g2, b2) Here, the t stage of fade (where t is 1≦t≦n
The display color data A (t) of an image point (an integer) can be calculated using the following equation (1).

A (t) = ((n-t)/n) p + (t
/n) q(ra(t), g a(t), b a(t
)) ” ・= (1) Here, ra(t) −((nt-t)/n) rl +
(t/n) r2ga(t)=((nt)
/n) gl + (t/n) g2ba
(t) = ((n-t)/n) bl +
(t/n) b2.

Note that the above equation (1) is only an example, and other arithmetic equations may be used.

When performing fade-in processing, the arithmetic unit 9 first places t-i and performs the arithmetic operation of equation (1) on all points (pixels) of one image. The display color data (lO), which is the calculation result, that is, the display color data (ra
(1), g a (1), ba (1)) are sent to the display color selection device 7. This display color selection device 7 refers to the color lookup table 8 based on the display color data (ra(1), ga(1), b a(1)), and selects the color data (ra(1), ba(1)). ga(1), ba(1)). Once the entry number is determined, the entry number (8) is transferred to a predetermined address (13) of the frame buffer 11 via the transfer device 4. (14) indicates the same color image data as the entry number (8).

In this way, all points (
pixel) color (r a(1), g a(1), ba(
1)) The entry number corresponding to
, the video signal generator 12 sends read address control information (24) to the readout device 13.

The reading device 13 outputs the frame buffer address (19) of each image point to the frame buffer 11. In response, the frame buffer 11 outputs color image data (20) expressed by the entry number, which is sent to the color signal generator 14 as data (21). The color signal generator 14 refers to the color lookup table 8 using data (22) which is the same as data (21), and generates display color data (23) corresponding to the data (22).
). The color signal generation device 14 converts the display color data into a color signal (25) and outputs the video signal generation bag r.
Send to l112. The video signal generator 12 converts this color signal into a video signal (26) and sends it to the display device 15. As a result, the display device 15 displays an image at the first stage (t-1) of the fade-in.

When the color entry numbers of all image points at t-1 are transferred to the frame buffer 11, display color data A(2) at t-2, that is, (r a(2), ga(2)
), ba(2)) is started. and,
By the same operation as described above, the entry numbers of the color lookup table corresponding to all the image points are stored in the frame buffer 11, and the corresponding images are displayed on the display device gi15.

When the above operation is continued until tmn, the fade-in operation is completed.

Note that the display color data A (t) of a certain image point at stage t of fade-in obtained by the arithmetic unit 9, that is, data corresponding to (r a (t), ga (t), b a (t)) is not registered in the color lookup table 8, the approximate color selection device 1o operates, selects display color data closest to this data from the color lookup table 8, and assigns an entry number to the display color data. is transferred to the display color selection device 7. Therefore, the entry number of the approximate color is stored in the address for this image point in the frame buffer 11.

Further, if there is space in the color lookup table 8, the display color data A(t), that is, (r a(
t), ga(t), b a(t)) are registered in this color lookup table 8, and the entry number corresponding to this display color data is transferred to the frame buffer 11.

The above explanation was about the operation when fading in an image, but when fading out, change t, which represents the fade stage, from n-1 to 0, and at each stage, do the same as above. All you have to do is process.

According to the above embodiment, since the display color data of all image points is updated at each stage of fading, smooth fading can be achieved. Furthermore, since the contents of the color lookup table 8 do not change during this process, for example, in a multi-window system, if a fade-in or fade-out process is applied to a color image in one window, the hues in other windows will change. There is no problem with changing.

Next, a second embodiment of the present invention will be described with reference to FIG. This embodiment relates to a device that transitions a color image specified by a cursor or menu to a black and white gradation image in n stages.

In the figure, 16 is a color/monochrome image conversion device, 17 is a color data setting device for monochrome images, and other symbols are the same as or equivalent to those in FIG. 1.

First, when a window to be processed is specified, a color-black-and-white image conversion instruction, and a fade instruction are given from the input device 1, the color image of the specified window is
This becomes the data stored in the memory 5.

Next, the input detection device 2 receives a color signal from the input device 1.
Based on the instruction for black and white image conversion, the color data setting device 17 for black and white images is activated. This monochrome image color data setting device 17 sets 16 entries of the color lookup table 8 to express 16 black and white gradations.

Next, the input detection bag 5!2 converts the color/black and white conversion parameters (27) in response to the color/black and white image conversion instruction.
is sent to the color/monochrome image conversion Wi16.

The color/monochrome image converter r1116 receives the color image data (29) stored in the first memory 5 and expressed by the entry number, and refers to the color lookup table 8 using the same signal (31). After converting into display color data (32), this is converted into black and white image data. This monochrome image data is again converted into an entry number by the color lookup table 8 and sent to the color/monochrome image conversion device 16. The color/monochrome image conversion device 16 sends this entry number data (30) to the second memory 6 via the transfer device 4. As a result, the second memory 6 stores black and white image data corresponding to the color image data in the first memory 5.

Next, the input detection device 2 sends an image conversion transfer command (28) to the image display control means 3. As a result, the image display control means 3 sends the transfer control command (1) to the transfer device 4, and sends the fade stage parameter (2) to the display color selection bag Fi.
Send to 7. For example, when performing color-black-and-white image conversion in four stages, the parameter is set as n-4.

Thereafter, the same operations as in the first embodiment are performed.

That is, the data of each image point is read out from the first and second memories 5.6, and sent to the display color selection bag r via the transfer device 4.
! Sent to t7. The display color selection device f7 converts the data of each image point into display color data by referring to the color lookup table 8, and then sends the data to the arithmetic device 9. The arithmetic unit 9 executes the arithmetic operation of the above equation (1), and calculates the color
Obtain display color data at each stage of black-and-white image conversion.

The display color selection device 7 converts the display color data into an entry number by referring to the color lookup table 8, and then stores this into the frame buffer 11. In this way, the color data of each stage represented by the entry number is sequentially stored in the frame buffer 11, and an image corresponding to this storage is displayed on the display device 15 by the same operation as in the first embodiment.

Therefore, the image displayed on the display device f15 gradually approaches a black and white image from a color image, and the last image is a second image.
The image becomes the same black and white image as that stored in the memory 6 of .

(Effects of the Invention) As is clear from the above description, according to the present invention, the display color data of all image points is updated at each stage of fading, so there is an effect that smooth fading can be achieved. .

Additionally, the contents of the color lookup table do not change at each stage of the fade, so even in a multi-window system, you can fade in or out a specific window without affecting the display of other windows. There is an effect.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram of a first embodiment of the invention, and FIG. 2 is a functional block diagram of a second embodiment of the invention. Diagram

Claims (1)

[Claims] (1) First and second memories in which a color image to be faded and the final color image or monochrome image thereof are stored, and data of each image point of both images from the first and second memories. means for sequentially reading out the display color data; a calculation means for sequentially obtaining display color data for each stage of fade from the read data; a color lookup table for converting the entry number and the display color data; a frame buffer for sequentially storing entry numbers of each point of the image at each stage; reading data of each image point from the frame buffer;
A color image display device comprising: means for converting into display color data using the color lookup table; and means for displaying the display color data.