JPS62264787A - Image pickup device - Google Patents

Abstract

PURPOSE:To always display an original at a constant screen size by measuring the position of the original and its size and moving a camera on the center of the original and only placing the original on an original platen. CONSTITUTION:The original 11 is placed on the black-painted original platen12. A picture input section 13 such as a TV camera is fitted to an arm 15 of a camera drive pole 14. The camera drive pole 14 is moved horizontally along one side X axis of the original platen 12 by a drive device (not shown) such as a stepping motor. The arm 15 is moved vertically along the Z axis of the pole 14 and the input section 13 is moved backward/ forward in the Y axis along the arm 15 by a drive mechanism (not shown) such as a stepping motor respectively. The position of the original and the size are measured and moved onto the center of the original and the camera is moved vertically or a zoom lens is zoomed, then the original is displayed always at a constant screen size by only placing the original on the original platen.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an imaging device that outputs an image of an object to be imaged to a video device or the like.

[Background Art] The progress of the information society in recent years has been remarkable, and we are seeing the emergence of new media one after another. One such example is an electronic overhead projector (0, H, P) used in an electronic conference system using television images.

Figure 9 shows the current quantities as well, which are commonly used optical formulas 0, H,
Indicates P. In this conventional apparatus, light transmitted through a document 2 placed on a document table 1 is reflected by a reflecting plate 3, and the contents of the document 2 are displayed on a projection plate 4. In such conventional O, H, and P, the contents of the original must be rewritten on a transparent vinyl sheet. Furthermore, in order to project originals of different sizes onto the projection plate with the same size, it is necessary to manually move the height of the reflecting plate 3 and the position of the original table 1 every time the original size changes. Furthermore, it was not possible to project images of opaque substances or three-dimensional objects.

Furthermore, since the images are projected optically, it is difficult to display them in multiple locations at the same time, and it is necessary to darken the area where the images are being displayed.

[Problems to be Solved by the Invention] The present invention solves the above-mentioned conventional drawbacks, can display the contents of a document written on plain paper as is, and displays a display image of the same size regardless of the size of the document. It is an object of the present invention to provide an imaging device that can display an image of a three-dimensional object.

[Means for Solving the Problems] In order to achieve such an object, the imaging apparatus of the present invention includes an imaging means for converting optical information from an object to be imaged into a video signal, and an imaging means for the object to be imaged. and a control means for detecting the ratio between the object to be imaged and the background from the video signal and controlling the driving means so that the ratio is a predetermined value. It is characterized by

[Function] Measures the position and size of the document, moves the camera unit to the center of the document, and moves the camera unit up and down or zooms the zoom lens, so the document is placed on the document table. Just by placing it on the screen, the original can be displayed at a constant screen size, and since it uses a video signal, it can be output to multiple display devices at the same time.

[Example code] The present invention will be described in detail below with reference to the drawings.

Example 1 FIG. 2 shows a perspective view of an embodiment of the imaging device of the present invention.

In the figure, reference numeral 11 denotes an original, which is placed on an original platen 12 painted black. Reference numeral 13 denotes an image power unit such as a TV camera, which is attached to the arm 15 of the camera drive column 14. The camera drive column 14 can be moved in the left-right direction along one side of the document table 12 (the X-axis in the figure) by a drive mechanism such as a stepping motor (not shown). The arm 15 extends vertically along the camera drive column 14 (Z-axis direction in the figure), and the image input unit 13 moves along the arm 1.
5 in the front-rear direction (Y-axis direction in the drawing) by a driving mechanism such as a stepping motor (not shown).

FIG. 1 shows an example of a block diagram of the embodiment shown in FIG. 2. In the figure, numeral 21 denotes an image-powered device (camera section), which corresponds to 13 in FIG. 22 is an amplifier, 23 is a video signal processing circuit that processes video signals, 24 is an encoder,
25 is a monitor. Reference numeral 26 denotes a control section consisting of a microcomputer or the like, and 27 an initialization switch that gives an instruction to the control section 26 to position the human-powered image device at a predetermined position. 28, 29 and 30 respectively indicate the X-axis,
A circuit 32 for detecting positions in the Y-axis and Z-axis directions is a circuit that adjusts the focus of the lens of the camera section in accordance with a control signal from the Z-axis position detection circuit. Primary color signals R, G, and B from the camera section 21 are amplified by an amplifier 22, video signal processed by a video signal processing circuit 23, and a chroma signal C and a luminance signal y are output to an encoder. On the other hand, the brightness signal y is manually input to the control unit z6, and the control unit 26 drives the X-axis motor based on the information of the brightness signal y so that the camera unit 21 is positioned over the center of the document, and the size of the output image is kept constant. Drive the Z-axis motor so that When the position of the camera unit 21 is determined, the position in the Z-axis direction is determined by the Z-axis position detection circuit 31, and the focus adjustment circuit 3 is determined according to the information.
2 drives the lens of the camera section 21 to focus.

Position control of the camera unit using a luminance signal will be explained.

The X-axis direction is the horizontal direction, the Y-axis direction is the vertical direction, one scanning period in the horizontal direction is the IH period, and one scanning period in the vertical direction is the IH period.
V close period. As shown in FIG.
A document 11 of an arbitrary size is placed at an arbitrary position. The dimensions of the portion of the document table 12 where the document is not placed are W for the left and right sides in the horizontal direction. LT WHR+up and down in the vertical direction are respectively WVu and Wvo. As shown in FIG. 4, the information of the 1v period based on the luminance signal is a portion having a certain signal level, including black levels WvU and Wv0. Detect the width of Wvu and Wvo, w Vu= w
When the Y-axis motor is driven so that vo is obtained, the camera section is positioned above the vertical center of the document. FIG. 5 shows the signal waveform during the IH period. When the X-axis motor is driven so that WoL=WllR, the camera section is positioned above the horizontal center of the document. Furthermore, W vu (W vo) or W
l(L(WHR) is a predetermined value Wv,
Alternatively, if the Z-axis motor is driven to move the camera unit so as to be equal to the WHC, the size of the output image will be constant regardless of the size of the document.

FIG. 6 shows a flowchart of the operation of this device. First, in step 51, the initialize switch 27
Check if it is ON. Initialize switch 27 is ON
Then, in step S2, the camera section 21 (13
) are driven at predetermined positions in the X-axis, Y-axis, and Z-axis directions. Normally, the position of the camera section 21 (13) is above the center of the document table 12 in the X-axis and Y-axis directions, and at a height such that the document table 12 covers the entire angle of view of the camera section 21 (13) in the Z-axis direction. Match. Next step S3
When the document is detected and placed on the document table, in step S5, the previously described Wvu,
Measure Wvo, W□, and WllR. Next, in step S5, WHL and Wl□ are compared, and if they are equal, the process advances to step S9.

If W, , L and W, lR are not equal, the process proceeds to step S6 to compare the magnitudes of the two, and depending on the result, the process proceeds to step S7 or S8 to move the X-axis motor in one direction or in the + direction by a certain amount (for example, stepping The motor is driven by one step) and the process proceeds to step S9. WvU and Wvo in S9
If they are equal, the process advances to step S13.

WVLI and Wvo7! l! If not equal, step 51
0 is compared, and depending on the result, S
11 or S12, the Y-axis motor is driven in one direction or a child direction by a certain amount (for example, one step of the stepping motor), and the process advances to step 513. In step 513, WHL and W□ and Wvc and WVD are compared,
If either condition WllL≦WHc or Wvo≦Wvo is satisfied, the process advances to step 517. WHL is WH
If WvU is larger than Wvc, the process proceeds to step 514, where the Z-axis motor is driven in one direction by a certain amount (for example, one step of the stepping motor). W HL
(W HR), W vu (W vo) are expanded new WHL (W++*), Wvu (Wv
o). Next, in step 515, position detection in the Z-axis direction is performed, and based on the result, in step 516, the focus adjustment circuit 32 is operated to adjust the position of the camera unit 21 (1).
3), the focus of the lens is corrected and the process proceeds to step 517.

In step 517, if the initialize switch is not turned on again, that is, if the document remains as it was, the process returns to step S4, and w, L, wHR, wVU, W
v.

The following measurements are repeated. When the image display of one original is finished and the next original is displayed, or when the original position is shifted due to an unexpected cause and control needs to be restarted, the initialization switch is turned on and the process returns to step S2.

In this way, in this device, the position control of the camera section is repeatedly performed minute by minute to guide the camera section to a position that is above the center of the document and where the conditions W, L≦W, c or WvU≦W9o are satisfied. , correct the focus. As a result, the original is projected onto the video display device without being biased vertically or horizontally, and the size of the image of the original projected onto the display device is constant regardless of the size of the original. The above-mentioned w, , c, and Wvc provide an area corresponding to a so-called frame of the original image on the display device. The document table 12 is preferably made larger by this frame than the maximum document size expected by the imaging device, and the maximum document size is preferably displayed or illustrated on the document table. If the document size exceeds the planned maximum size, that is, at the beginning of the measurement, W) IL < WHC (or W HR <
W HC), W vu< W vc (or W v
o<W vc), it is also possible to lock the camera unit and display a message to that effect.

Embodiment 2 FIG. 7 shows a block diagram of another embodiment of the present invention. 1st
The difference from the first embodiment shown in the figure is that the motor drive is controlled only in two directions, the X-axis and the Y-axis, and a zoom lens is used for the Z-axis direction, so that the camera can be zoomed while keeping it fixed. The purpose is to drive the lens to keep the screen size constant. 33 in FIG. 7 is a zoom control circuit controlled by the control section 26. By using a zoom lens, it is possible to focus on a document such as a thick book or an object that is high above the document table.

FIG. 8 shows a flowchart of the operation of this embodiment. Steps S1 to S13 are exactly the same as the flowchart in FIG. In step 513, WH
If C is larger than WHc and Wv and J are larger than Wv, the zoom lens is driven to the telephoto side by a certain amount in step 521. The next step S22 is exactly the same as step S17 in FIG. This embodiment is the same as the first embodiment except that zooming of a zoom lens is used instead of Z-axis driving. However, in this example, if the focus is set initially, no focus correction is required when enlarging the screen by zooming.

[Effects of the Invention] According to the present invention, the position and size of the document are measured,
The camera unit is moved to the center of the document, and the camera unit is moved up and down or the zoom lens is zoomed, so you can always copy the document at a constant screen size just by placing the document on the document table. Since a video signal is used, it can be output to multiple display devices at the same time. Furthermore, in the case of monitors, there is no need to darken the room, allowing meetings to proceed smoothly. In addition, objects that could not be projected using conventional optical methods can be easily projected. In addition, by changing the angle of the camera, you can easily capture the inside of the venue, etc. Since video signals are used, the contents of the manuscript can be easily recorded and played back on magnetic recording media such as video floppy disks, and still images can be recorded.・Random access of manuscripts is also possible when shared with a playback system.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a perspective view of an embodiment of the present invention, FIG. 3 is a diagram illustrating the position of a document on the document table, and FIG. FIG. 5 is a diagram showing signal waveforms in horizontal scanning; FIG. 6 is a flowchart of the operation of the device shown in the block diagram of FIG. 1; FIG. 7 is another embodiment of the present invention. FIG. 8 is a flowchart of the operation of the embodiment shown in FIG. 7, and FIG. 9 is a perspective view of conventional optical systems ○, H, and P. 1.12... Original table, 2.11... Original, 13.21... Image human power section, 14... Camera drive column, 15... Arm, 23... Video signal processing circuit, 26...Control unit, 2nd floor...Initialize switch, 28...X-axis motor, 29...Y-axis motor, 30...Z! 1! lII motor, 31... Z-axis position detection circuit, 32... Focus adjustment circuit, 33... Zoom control circuit. γ Figure 2

Claims (1)

[Scope of Claims] 1) Imaging means for converting optical information from an object to be imaged into a video signal; driving means for changing the size of an image of the object to be imaged by the imaging means; and the video signal. An imaging apparatus comprising: a control means for detecting a ratio between the object to be imaged and a background, and controlling the driving means so as to set the ratio to a predetermined value. 2) The control means detects the ratio in an up-down direction and a left-right direction, and controls the drive means so that at least one of the ratios becomes a predetermined value. Imaging device.