JPH02146534A - Picture display device - Google Patents

Abstract

PURPOSE:To recognize a display scope displayed on a display by placing marks or marking lines in an image pickup position where an original picture is projected through an image pickup lens. CONSTITUTION:When a power source switch is turned on, LEDs 9a to 9d light up and four bright marks 10a to 10d are reversely projected on an original through the image pickup lens 5. Without the original 4 placed on an original platen 1, the four bright marks 10a to 10d are reversely projected on the original platen 1. An instructor places the original 4 on the original platen 1 by matching it to the four marks 10a to 10d. Consequently, the original range enclosed by the four marks is projected through the image pickup lens 5 and image-picked up on the surface of a CCD image sensor 6 in the image pickup position.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an image display device that captures an image of a document using a video camera and displays the image on a display, and particularly relates to an image display device that can indicate the display range displayed on the display. Regarding equipment.

(Prior Art) For example, a manuscript display device that enlarges and displays a manuscript at a conference or research presentation uses a so-called electronic OHP, which captures an image of the manuscript with a video camera, converts the image of the manuscript into an electrical signal, and then displays it on a display. There is something called. This electronic OHP video camera includes an imaging lens that captures an image of an original, and an imaging element placed at the imaging position a, such as an imaging tube or a COD image sensor, which captures an image of the original at an imaging position by the imaging lens. has. The image converted into an electrical signal by the image sensor is displayed on a display such as a CR
T display or projection screen.

Alternatively, it is reproduced by an image forming apparatus that forms images using magnetic toner. Incidentally, an image forming apparatus δ using this magnetic toner is described, for example, in Japanese Patent Publication No. 48707/1983. In such an image display device, the speaker, who is the user, places a manuscript for explanation on the manuscript table, focuses the imaging lens on the manuscript, and then
Display the image of the original on the display. In this state, the speaker points directly at the top of the manuscript with a baton or the like, or points at the display screen to explain the manuscript, etc.
Note 5: Many of these image display devices employ a zoom system that can change the focal length of the imaging lens, and by changing the magnification displayed on the display, a desired portion of the document can be enlarged to a desired magnification. It can be enlarged and displayed.

(Problem 8 to be solved by the invention) However, in the above-mentioned conventional technology, the video camera and the display are placed at a distance from each other, and the speaker speaks with his back to the display when fishing on a boat. Therefore, unless you can look back at the display, you cannot know exactly which part of the document is being displayed on the display.

In particular, in a display that uses an image forming apparatus using the toner, the image forming apparatus does not output an image at the same time as an electrical signal is input from the video camera to the image forming apparatus. Even if the desired range of the document is not displayed on the screen of the image forming device or display, the displayed range cannot be immediately corrected. It is necessary to shift the position of the image forming apparatus, take another image with the video camera, input the electric signal to the image forming apparatus again, and form the image again, resulting in extremely poor operability.

This invention was made in view of the above-mentioned problems, and allows the user, i.e., the speaker, to immediately recognize which area of the document is being displayed by simply looking at the document without turning toward the display. The purpose is to obtain an image display device that can

(Means for Solving the Problems) The present invention includes: an imaging lens that images an original, an imaging element that captures a projected image from the imaging lens, and an image sensor that receives a signal from the imaging element and displays the original image. In an image display device having a display.

A reference point source or reference line source for indicating the display range displayed on the display is provided near the imaging position of the imaging lens.

[For production]

By providing a gauge point or a marked line at the imaging position where the image of the original is projected by the imaging lens, the gauge mark or the marked line can be back-projected toward the original using the already existing imaging lens. Therefore, the speaker can recognize the display range displayed on the display without looking back toward the display by looking at the gauge points or gauge lines back-projected onto the document.

(Embodiment) A first embodiment of the image display device of the present invention is shown in FIG.
and a display 3.

The original 4 is placed on the original table L, and the video camera 2
The focus of the imaging lens 5 is set on the surface of the document table l. Inside the video camera 2, a CCD image sensor 6, which is an imaging element, is placed at an imaging position where the image of the original 4 is projected by the imaging lens 5.

The image information of the document 4 converted into an electric signal by the CCD image sensor 6 is inputted to the CRT display, which is the display 3, through the output code 7, and is displayed on the display screen 8 of the display 3.

The CCD image sensor 6 is arranged on a rectangular surface, and LEDs (light emitting diodes) 9a and 9b are provided at the four corners of the rectangle to serve as reference point sources for indicating the display range displayed on the display.

9c and 9d are provided.

The operation of this embodiment will be explained below. A speaker who is a user of this device turns on a power switch (not shown) of the image display device. Then, the LEDs 9a, 9b, 9c, 9d
lights up, and four bright l'A images are captured by the imaging lens 5.
Points 10a, 10b.

10c and 10d are back-projected onto the original. When the document 4 is not placed on the document table l, there are four bright markers 10a and 10b on the document table 1.

10c and lOd are back-projected. When placing the original 4 on the original platen 1, the speaker 0 places the original 4 so that it aligns with the four reference points. In other words, the speaker
Adjust the range of the document you want to display to the rectangular range surrounded by the four bright gauge points. This results in this 4
The range of the document surrounded by the two reference points is projected by the imaging lens 5 and imaged onto the surface of the CCD image sensor 6 located at the image position a. The image of the document captured in this manner is converted into an electrical signal by the CCD image sensor 6 via a processing electronic circuit (not shown), and is inputted to the display 3 through the output cord 7. The range of the document surrounded by the four markers is displayed on the display screen 8 of the display 3.
will be displayed. If you want to change the display range of manuscript 4,
By shifting the document 4 with respect to the four reference points 10a, 10b, 10c, and lOd, the changed display range is accurately displayed on the display screen of the display 3. At this time, there is no need for the speaker to turn back toward the display 3 and look at the display screen 8.

In the above embodiments, the display 3 has been described as a CRT display, but in other embodiments, the display 3 may be an image forming device using magnetic toner. In this case, first, the video camera 2 is turned on, the desired area of the document is accurately aligned with the four gauge marks, and then the image forming device is operated to form an image, thereby allowing the user to talk as before. This eliminates the trouble of redoing input to the image forming tank because the desired range is not displayed.

Further, in the above embodiments, even when the imaging lens 5 is of a zoom type in which the focal length can be changed, the LED 9a,
9b, 9c, 9d are CCD image sensor 6 4111
1! That is, since it is located at the imaging position of the imaging lens 5, the focal length can be changed, and even if the magnification of the display image 8 is changed, the display range can be accurately indicated.

In the first embodiment described above, the reference point source is located at the same position as the CCD image sensor 6, which is an image element, that is, at the imaging position t.
However, as in the second embodiment shown in FIG. 2, the marking line source may be provided at an imaging position different from that of the imaging element.

Note that the same parts in FIG. 2 as in FIG. 1 are designated by the same numbers and their explanations will be omitted.

That is, a beam splitter 11 is provided between the imaging lens 5 and the CCD image sensor 6 which is an imaging element.
A second imaging position of the imaging lens 5 is provided at a position different from that in the 90'' direction.This second imaging position δ is a reference line source for back-projecting the rectangular reference line 12 onto the original. mask 1
3 is installed, and behind this mask 13 is a mask 13.
Light source 1 for illuminating the marking line 12 and making it stand out brightly
4 are provided.

The operation of this embodiment will be explained below. An image of the original 4 is projected onto a first imaging position by an imaging lens 5. At this time, the beam splitter 11 splits some of the light from the original 4 into 9
Although it is reflected at 0°, most of the other light is imaged at the first imaging position. At this first imaging position, a CCD image sensor 6, which is an imaging element, is provided as in the conventional case, and converts the formed image into an electrical signal. It is assumed that this electrical signal is input to the display through an output cord as in FIG. 1. On the other hand, the mask 13 illuminated by the light [14 is brightly illuminated at the rectangular marked line source, and the image of this marked line is reflected by 90 degrees by the beam splitter 11 and back-projected onto the original 4 by the imaging lens 5. be done. This allows the speaker, who is the user of the device, to position the range of the document to be displayed on the display within this rectangular marked line 12, thereby viewing the range displayed on the screen without looking at the display screen. In this embodiment, the display range displayed on the display is indicated by marked lines, so that the display range can be recognized more accurately. It should be noted that, like the first embodiment, in this second embodiment, even if the imaging lens is a zoom lens that can change the focal length and the device is capable of enlarging the document and displaying it on the display, the mask 13 Since the position is provided at the second imaging position, the marked line 12 can accurately represent the display range even when the enlargement is performed.

(Effects of the Invention) According to the image forming apparatus of the present invention, by providing a gauge point source or a gauge line source at the imaging position where the image of the document is projected by the imaging lens, the gauge point source can be used to utilize the already existing imaging lens. Alternatively, the marking lines can be back-projected onto the document, allowing the speaker who is the user of the device to recognize which area of the document is currently being displayed while looking at the document without turning around to look at the display. can. Since it uses a conventional imaging lens, the cost does not increase much compared to conventional image display devices, and the image display device can change the focal length of the imaging lens to change the magnification of the display. In the case of a zoom system that allows display, the display range can be accurately indicated according to the magnification.

[Brief explanation of the drawing]

FIG. 1 is an overall schematic perspective view of a first embodiment of an image display device of the present invention, and FIG. 2 is a perspective view for explaining the main parts of the second embodiment. Explanation of symbols 1...Original table 2...Video camera 3...
・Display 4... Original 5... Imaging lens 6... CCD image sensor 7... Output code 8... Display screen 9a, 9b
, 9c, 9d...-LED loa, 10b, lOc, 10d---marked line 11...
Beam splitter 12...marked line 13...mask 14...light source patent applicant CA/N Co., Ltd.

Claims (1)

[Scope of Claims] An image display device that includes an imaging lens that captures an image of an original, an imaging element that captures a projected image from the imaging lens, and a display that displays the original image in response to a signal from the imaging element. An image display device characterized in that a reference point source or a reference line source for marking a display range displayed on the display is provided near an imaging position of the imaging lens.