JPH03157691A - Image processor for projection - Google Patents

Abstract

PURPOSE:To facilitate the partial correction and change of the contents of a projection display by displaying only the image information by an image information forming means by a projection unit. CONSTITUTION:The process control by a CPU 18 is executed according to the corresponding program read out of the program memory 22 of a personal computer 6 according to the operation of a keyboard 8, by which the image information is formed. This information is displayed together with the operation information on a CRT display 7. Only the formed image information is simultaneously stored into an image memory 16 for projection of the projection unit 2 and only the formed image information is displayed in an image display section 17 for projection, such as liquid crystal display device. The partial correction and change of the contents of the projected display are easily and surely executed in accordance with the easily visible display.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a projection image processing device for processing a projection image for forming a projection image used in explanations and presentations aimed at a large number of people. 2 [Prior art] A subject is created by transferring an original created using a Word Brosser etc. onto a transparent sheet, and this By projecting the transmitted light of the object onto a screen, it is possible to project and enlarge the contents of the document, and an overhead rad projector is known as a device that enables such display. What are some examples of published literature?

There is.

[Problem to be solved by the invention]

However, with such a device, it takes time and effort to create the subject, attach the subject to the Overherad projector, and replace the subject to change the displayed content, and it is also difficult to provide explanations and presentations while projecting and enlarging the display. Even if it becomes necessary to partially modify or change the displayed content, it is not possible to deal with it on the spot.

Therefore, the inventors of the present invention have investigated a system in which a liquid crystal panel is used in place of the transparent sheet and the liquid crystal panel is driven based on information such as text created on a personal computer or the like. According to this method, the driving information of the liquid crystal panel can be changed by a personal computer, so it is possible to partially correct or change the projected image while the liquid crystal panel is attached to the over-rad projector. This solves various problems when using sheets. In order to further facilitate the creation of texts, etc. used for projection image formation (including partial modifications),
It is preferable to display operation information for supporting the creation of sentences, etc., on the CRT display as a terminal of the personal computer.

However, according to the inventor's study, in addition to the text used to form a projected image, if operation information for supporting the creation of this text is also displayed on the CRT display, this operation It has been found that even information is used as drive information for the liquid crystal panel, and as a result, the operation information is projected and displayed, resulting in a very unsightly projection display.

One object of the present invention is to provide a projection image processing device that allows easy partial modification or change of the projection display contents and also enables easy-to-see projection display.

The above and other objects and novel features of the present invention include:
It will become clear from the description of this specification and the accompanying drawings.

[Means to solve the problem]

A brief overview of typical inventions disclosed in this application is as follows.

That is, a projection unit that displays a projection image to be exposed for forming a projection image, an image information creation means that creates this projection image information, operation information that supports creation of this image information, and created image information. and further includes a display control means that enables the projection unit to display only the image information created by the image information creation means, or from the display content of the display means. An oval projection image device including display content specifying means for specifying the content to be provided for the projection image display, and display control means for enabling display of only the specified display content on the projection unit. It is.

Here, the projection unit can be formed to include a liquid crystal panel that limits light transmission according to the projection image.

Furthermore, in order to be able to display the image outline smoothly even when the projection image is enlarged, the projection image information may be created using outline font information that expresses character information as a set of outline lines. In order to further smooth the contour of the projected image, it is recommended to perform smoothing processing on the projected image contour area.In order to easily realize this smoothing process, the pixels included in the projected image contour area are It is preferable to give an intermediate gradation between the highest gradation and the lowest gradation of the projected image. At this time, the pixels giving the intermediate gradation can be determined by determining the pixel values in the matrix direction of the projection image,
Furthermore, intermediate gray scales can be realized by intermittently placing a corresponding portion of the liquid crystal panel in a light-shielding state at a predetermined period.

[For production]

According to the above-described means, the image information creation means can create the projection image information displayed on the projection unit, partially modify it, etc., and furthermore, create the projection image information and partially modify it. Operation information is displayed on the display means during such operations, and this facilitates creation of projection display contents, partial corrections, and the like. Then, the projection unit displays only the image information created by the image information creation means, or only the content specified by the display content specifying means from the display content of the display means, and this causes the projection display content to be displayed. It functions to eliminate inappropriate projection display and to enable easy-to-see projection display.

〔Example〕

FIG. 2 shows a projection system that is an embodiment of the present invention.

This projection system includes, but is not limited to, a projection device 1
0. Projection image processing bag [120, and screen 30 are included.

The projection device 10 includes, but is not particularly limited to, a device main body 1 incorporating a projection light source, and a condenser lens 3 and a reflecting mirror 4 supported by the device main body 1 via an arm 5.

Although not particularly limited, the projection image processing device 20 processes images for projection, and includes a projection unit 2 mounted on the upper part of the projection device main body 1, and a personal computer connected to the projection unit 2 by a cable. computer 6
The personal computer 6 has a CRT display 7 and a keyboard 8 as terminal equipment.

The projection unit 2 includes, but is not particularly limited to, a liquid crystal panel 11 supported by a rectangular frame 13 and capable of displaying an image, and an electric circuit including a drive circuit for the liquid crystal panel 11, etc., as shown in FIG. It has a circuit section 12. This projection unit 2 is attached to the main body 1 of the projection device so that the liquid crystal panel 11 is located at the light emitting part of the main body 1 of the projection device, and the light emitted from the main body 1 of the projection device is transmitted to the liquid crystal panel 11.
The entire surface of the area is illuminated evenly. The liquid crystal panel 11 displays a projection image that is exposed for forming a projected image, as will be described in detail later, and the transmitted light of the liquid crystal panel 11 on which this image is displayed is condensed. The light is condensed by the lens 5 and further reflected by the reflection mirror 4 to be irradiated onto the screen 30, thereby forming a projected image on the screen 30.

FIG. 1 shows a block configuration of the projection image processing device 20. As shown in FIG.

As shown in the figure, the projection unit 2 includes, although not particularly limited to, a projection image display section 17 including the liquid crystal panel 11, and information provided for image display on the projection image display section 17. The projection image memory 16 stores projection image information (projection image information), and the outline font memory 15 stores outline font information that expresses character information by a set of outlines or outlines. The projection image memory 16 is connected to a system bus 24 in the personal computer 6, and the projection image memory 16 is connected to a system bus 24 in the personal computer 6.
It is possible to write to.

The information is written into the projection image memory 16 in synchronization with the system clock in the personal computer 6, and the information is read out from the projection image memory 16 in synchronization with the display clock in the projection image display section 17. It will be done. The outline font memory 15 is also connected to the system bus 24, and the information in the outline font memory 15 is used when the personal computer 6 creates projection image information.

The personal combination coater 6 is responsible for creating projection image information (including partial modification of the information) and controlling the operation of each part of the apparatus of this embodiment. Each of these CP 018
A program memory 22 .coupled to the program memory 22 . It includes a display memory 23. The CPU 18 executes a program stored in the program memory 22 to perform predetermined arithmetic processing. The process for creating projection image information and the operation control of each part of the apparatus of this embodiment are performed by the CPLJI8 executing a predetermined progera/=1. Here, the creation of the projection image information is performed as follows. First, operation information that supports the creation of the projection image information is written into the display memory 23, and is displayed on the CRT display 7 as a display means. be done. This operation information is created by the dot address calculation of the CPU 18 based on the 1-line font information specified by the program.

That is, the CPU 18 reads the outline font information designated by the program from the outline font memory 5 and 2. - Line font information is converted into dot address information by calculation and written into a predetermined storage area of the display memory 23.

The stored contents of the display memory 23 are read out in synchronization with the display clock on the CRT display 7, so that the operation information is displayed on the CRT display 7. The operator operates an input device such as a keyboard 8 or a mouse (not shown) while looking at the contents displayed on the display 7 to input information such as characters and figures to create projection image information, and then under the control of the CPo 18. , the corresponding information in the outline font memory 15 is read out, and the CP
018 is 9% of this feeling! The dot address is calculated based on the number J. Therefore, this dot address information is stored in the external memory 21 and written in the display memory 23.

This information is written to the display memory 23 in a unique storage area different from that for the operation information. The storage contents of the display memory 23 are constantly read out in synchronization with the display clock. Therefore, each time new information is input by operating the keyboard 8 or the like, or when an alarm 1 for creating operation information is read by a program. - Every time line font information is specified, the contents of the display memory 23 are rewritten, and the display contents of the CRT display 7 are partially changed or updated.6 Note that the operation information is not written to the display memory 23. However, it is not written to the external memory 21. Furthermore, the projection image information can also include graphic information such as charts, and in this case, the font information can also be used as annotations and headings for the charts.

Of the contents displayed on the CRT display 7, only the projection image information can be transferred to the projection image memory 16 under the control of the CPU 18. This information transfer instruction can be made via the keyboard 8. In other words, when this information transfer instruction is given, under the control of the CPU 18,
The driver address information (converted based on the line font information) corresponding to the projection image currently displayed on the CRT display 1 and 7 is stored in the external memory 2.
1 and written into the projection image memory 16.

Further, it is also possible to transfer only specific contents among the contents currently displayed on the CRT display 1 to the projection image memory 16. In this case, instructions for information transfer can also be made using the keyboard 8 or mouse.
8 transfers only the information of the area specified by the keyboard 8 to the projection image memory 16. The contents stored in the projection image memory 6 are transmitted to the projection image display section 17 and displayed on the liquid crystal panel 11. The display content of this liquid crystal panel 11 is different from the display content of the CRT display 7, and is only a projection image or only a region of this projection image specified by the operator.

Here, the display control means in the present invention is functionally realized by the CPU 18.

The display content of the liquid crystal panel 11 will be projected onto the screen 30 by the projection device 10, but if it becomes necessary to partially modify or change this projected image, in the case of creating the above-mentioned projection image information. You can easily modify or change the corresponding part by using the same operations as . That is, a corresponding location is specified on the display screen of the CRT display 7 using, for example, a cursor, and information such as new characters is inserted into the specific location. The cursor can be moved using the keyboard 8, mouse, or the like. Then, by inputting new information, the contents of the relevant portions in the display memory 23 and external memory 21 are changed, and then, by an information transfer instruction via the keyboard 8, only the information related to the modified portion is transferred to the projection image memory 16. Transfer it to , and rewrite the contents of the relevant part.

Here, the projection image information creation means in the present invention is realized by the personal computer 6, and the display content specifying means is realized by the keyboard 8 and the mouse.

FIG. 4 shows a detailed configuration of the projection image display section 17.

As shown in the figure, the projection image display section 17 is.

Address generator 26. Timing signal generation circuit 2
7. LCD panel 11. and a smoothing processing circuit 28.

The timing signal generation circuit 27 sequentially activates selection signals for selecting elements forming the liquid crystal panel 11 row by row. The address generator 26 generates an address signal for reading the image information in the projection image memory 16 line by line in synchronization with the selection of the liquid crystal panel forming elements.

The image information read from the projection image memory 16 is provided to the liquid crystal panel 11 via the smoothing processing circuit 28. In the liquid crystal panel 11, only the liquid crystal panel elements (pixels) belonging to the rows made active by the timing signal generation circuit 27 and the columns whose output from the smoothing processing circuit 28 is active are blackened. This puts the device in a light-blocking state, while the other elements enter a light-transmitting state.

Scanning of the 11 surfaces of the liquid crystal panel is repeated at a predetermined period,
A projection image is formed on the liquid crystal panel 11 by blackening the corresponding element of the liquid crystal panel 11 according to the projection image information.

Although not shown, the liquid crystal panel 11 is provided with a liquid crystal drive circuit, and the liquid crystal panel 11 is directly driven by this liquid crystal drive circuit based on the outputs of the timing signal generation circuit 27 and the smoothing processing circuit 28. will be carried out.

In this embodiment, as described above, outline font information is used to create projection image information, so when enlarging processing is performed at the image information stage, projection image information is created using dot font information. You can obtain an image with clearer outlines than when

However, depending on the magnification ratio of the projection device 10, as shown in FIG. The projected image may lack clarity. Therefore, in this embodiment, by smoothing the contour area of the projected image projected onto the screen 30 by the projection bag [10, a clearer and higher quality projected image is obtained.

Smoothing processing is achieved by giving an intermediate gradation between the highest and lowest gradations of the projected image to pixels included in the axial region of the projected image, and such processing is performed by a smoothing processing circuit. 28
carried out by.

The principle of the smoothing process is shown in FIGS. 6 and 7A to 7D.

In FIG. 6, the hatched pixel A is a part that forms a projection image, and is a blackened element. If the intermediate gradation is realized by the pixel B belonging to the contour area of this projection image, the contour area of the projected image will be smoothed, resulting in a good projected image.

Pixels to which intermediate gradation is to be applied are determined as follows by determining pixel values in the matrix direction of the projection image. In Figures 7A to 7D, °C "1" indicates a pixel displayed in black,
rOJ indicates a pixel displayed in white, and a hatched portion indicates a pixel to which an intermediate gradation is applied. That is, the pixel values above and below the pixel indicated by hatching are different, and the pixel values on the left and right sides are also different, and when the pixel is originally displayed as a mortar, an intermediate gradation is given to the pixel. The intermediate N word can also be created by controlling the voltage applied to the liquid crystal panel element, but in this embodiment.

This is achieved by intermittently placing the corresponding element in the liquid crystal panel 11 in a light shielding state at a predetermined period.

Next, the detailed configuration of the smoothing processing circuit 28 will be explained.

The smoothing processing circuit 28 shown in FIG. 4 includes processing units 281 to 28n (n is a positive integer) with 4-bit output, and details of the processing device 282 are shown in FIG. Note that each device 281 to 28n has the same configuration.

Processing device 28 shown in the figure. has 30, 31, 32, 33 to the processing unit l of the same configuration, and the signal input terminal R1n and signal output terminal RO11t in each processing unit are connected to the signal output terminal L in the adjacent unit 1-.
o u t4. The data input terminal Din is connected to the signal input terminal L in of each processing unit 30 -
Every 33 units are independent.

Each processing unit 30 to 33 has a latch circuit 34.
, 35 and 36 are connected in series, a shift register is formed which shifts one bit of the projection image information in synchronization with the clock signal CK transmitted from the timing signal generation circuit 27. Latch circuit 34, 3
5.36 holds information in the column direction of the liquid crystal panel ]-1 (direction indicated by arrow 29 in FIG. 4). In each processing unit 1-30 to 33, the holding output of the latch circuit 35 is transmitted to the liquid crystal panel 11 via the OR gate 40, and the holding output of this latch circuit 35 is used to drive the liquid crystal panel 11. This is the current image information that will be displayed. Therefore, at this time, the information held in the latch circuit 34 is information (referred to as next information) that is shifted to the latch circuit 35 at the next timing and used as a drive signal for the liquid crystal panel 11, and the information held in the latch circuit 36 is information that is shifted to the latch circuit 35 at the next timing and used as a drive signal for the liquid crystal panel 11. This is information that has already been used to drive the liquid crystal panel 11 at the timing (referred to as previous information). In other words, the latch circuits 34, 35, and 36 have
The next information, current information, and previous information regarding one bit in the column direction of the liquid crystal panel 1-1- are held.

The exclusive OR gate 38 calculates the exclusive OR of the holding output of the latch circuit 34 and the holding output of the latch circuit 36, so that if the previous information and the next information are different, that is, as shown in FIG. 7A. ~7th D
In the figure, a case is detected in which the pixel values above and below the hatched pixel are different from each other. In addition, exclusive or game-1-37 in each processing unit 30-33
is the latch circuit 3 in the left and right adjacent processing units.
This is to obtain the exclusive OR of the held outputs of 5, thereby detecting cases where the pixel values on the left and right of the hatched pixels in FIGS. 7A to 7D are different from each other. If the held value of the latch circuit 35 in each of the processing units 30 to 33 is "1", the corresponding pixel will be blackened regardless of the output state of the exclude-or gates 37 and 38. Conversely, if the held value of the latch circuit 35 is r□), it is the 7th A.
It means that the value of the hatched pixel in FIGS. 7D to 7D is rOJ, and in this case, the output of the exclude-jib-or gate 37, 38 is "1", and the control signal from the timing generation circuit 27 is F/S
When the pixel value becomes "1", the output state of the AND gate 39 becomes "1", so that the pixel value is set to "1" even though it is originally "O". Here, the control signal F
/S is set to "1" by the timing signal generation circuit 27 at a rate of, for example, once every two scans of the entire surface of the liquid crystal panel 11, and by such duty cycle control, the pixel is set to "1" at the intermediate Wi scale in the projected image. Realize. Of course, by setting the control signal F/S to "1" once every 3 or 4 scans, the intermediate gradation can be brought closer to white.

According to the above embodiment, the following effects can be obtained.

(1) Creation of projection image information displayed on the projection unit 2, partial modification, etc. can be performed by the personal computer 6, and when creating this projection image, partial modification, etc., the CRT display 7 can be used. Since operation information is displayed on the screen, creation of projection display contents, partial corrections, etc. can be easily and quickly performed. Under the control of the CPU 18, the projection unit 2 receives only projection image information or the CRT display 7.
Since only the content specified by the keyboard 8 among the display contents is displayed, it is possible to eliminate the projection display of operation information and the like that would be inappropriate as the projection display content, and it is possible to provide an easy-to-read projection display.

(2) Projection Image By applying the liquid crystal panel 11 that enables projection image formation by restricting light transmission according to image information, the projection unit 2 can be easily realized.

(3) In creating projection image information, outline font information is used, compared to the case where the information is created using, for example, a dot font.

Even when the projection image is enlarged, the image outline can be displayed smoothly.

(4) By providing the outline font memory 15 for storing the outline font information in the projection unit 2, even when a general-purpose personal computer without an outline font memory is used, the above (
The effect of 3) can be easily obtained.

(5) By providing the smoothing processing circuit 28 for smoothing the contour area of the projected image, even when the projection magnification of the projection device 10 is high, the contour area of the projected image is smooth and high-quality projection can be achieved. You can get the image.

(6) In addition, in the above-mentioned smoothing process, this gradation smoothing process is facilitated by giving an intermediate gradation between the highest gradation and the lowest gradation of the projected image to the pixels included in the contour area of the projected image. can be realized.

(7) Furthermore, in the smoothing process, pixels to which the gradation should be applied can be easily determined by determining pixel values in the row direction of the projection image.

(8) And the intermediate gradation in the above gradation smoothing process is
When the projection unit 2 includes the liquid crystal panel 11, this can be easily realized by intermittently blackening the corresponding portions of the liquid crystal panel 11 at a predetermined period.

Although the invention made by the present inventor has been specifically explained based on the examples above, the present invention is not limited to the above-mentioned examples, and can be variously modified without departing from the gist thereof.

For example, in the above embodiment, the display content of the CRT display 7 is also created using outline font information, but the display content of this CRT display 7 is created using dot font information, and the display content of the CRT display 7 is created using dot font information. Only images may be created using outline font information, or projection image information for multiple images may be created in advance and stored in the external memory 21.
By storing the images in the image display area, it is possible to easily switch and display images for projection on the projection unit 2 by operating the keyboard 8 or the like. Furthermore, a liquid crystal display can be used instead of the CRT display 7.

In the above embodiment, a pixel that provides an intermediate gradation is determined by determining the pixel values of four surrounding points, but the accuracy of pixel determination can also be improved by determining the pixel values of eight surrounding points.

〔Effect of the invention〕

A brief explanation of the effects obtained by typical inventions disclosed in this application is as follows.

That is, creation of projection image information displayed on the projection unit, partial modification, etc. can be performed by the image information creation means, and when creating this projection image information, partial modification, etc., operation is performed on one display means. Since the information is displayed, it is possible to easily and quickly create the projection display contents, make partial corrections, etc. Then, only the image information created by the image information creation means is provided to the projection unit.

Alternatively, only the content specified by the display content specifying unit from the display content of the display unit is displayed, and the content that would be inappropriate as the projection display content is not displayed, so that an easy-to-read projection display can be performed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a projection image processing device that is an embodiment of the present invention, FIG. 2 is an explanatory diagram of the configuration of a projection system including the projection image processing device, and FIG. 3 is a projection unit in FIG. 2. FIG. 4 is a block diagram of the structure of the projection image display section in FIG. 1. Fig. 5 is a block diagram of the main parts of the smoothing processing circuit in Fig. 4; Figs. 6, 7A, 7B, 7C, and 7D are diagrams explaining the principle of smoothing processing; Fig. 8 FIG. 2 is an explanatory diagram of enlarged projection display on the projection device. 2... Projection unit, 6... Personal computer, 7... CRT display 58... Keyboard. DESCRIPTION OF SYMBOLS 11... Liquid crystal panel, 15... Outline font memory, 16... Image memory for projection, 17... Image display unit for projection,] 8... CPU, 20... Image processing device for projection , 23... display memory, 28...
...Smoothing processing circuit. 2 of candles m1-(shiεjirlength l 2) 1,000-≦-nt 6th figure 74th figure B figure C figure 7D figure figure

Claims (1)

[Scope of Claims] 1. A projection unit that displays a projection image to be exposed for forming a projection image, image information creation means that creates this projection image information, and operation information that supports creation of this image information. and a display means for displaying the created image information, the projection image processing device having a display control means that enables the projection unit to display only the image information created by the image information creation means. An image processing device for projection including. 2. A projection unit that displays a projection image to be exposed for forming a projection image, an image information means that creates this projection image information, and operation information that supports the creation of this image information and the created image information. a projection image processing apparatus having a display means for displaying, a display content specifying means for specifying the content to be provided for the projection image display from the display content of the display means, and a projection image processing apparatus for displaying only the specified display content. A projection image processing device including a display control means that enables display on a projection unit. 3. The projection image processing apparatus according to claim 1 or 2, wherein the projection unit includes a liquid crystal panel that limits light transmission according to projection image information. 4. The projection image processing apparatus according to claim 1, 2 or 3, wherein the image information creation means creates the projection image information using outline font information that expresses character information as a set of outline lines. 5. The projection image processing apparatus according to claim 1, wherein the projection unit includes a smoothing processing circuit that performs smoothing processing on a contour area of the projected image. 6. The above-mentioned smoothing processing circuit realizes the above-mentioned gradation smoothing processing by giving an intermediate gradation between the highest gradation and the lowest gradation of the projection image to pixels included in the contour area of the projected image. Item 5. Projection image processing device according to item 5. 7. The projection image processing apparatus according to claim 6, wherein the pixels providing the intermediate gradation are determined by determining pixel values in the matrix direction of the projection image. 8. The projection image processing apparatus according to claim 6 or 7, wherein the intermediate gradation is obtained by intermittently placing a corresponding portion of the liquid crystal panel in a light shielding state at a predetermined period.