JP2012070031A - Image display system, imaging apparatus, image display system control method, and imaging apparatus control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image display system allowing simple measurement of the size of a subject included in a captured image.SOLUTION: An image display system 1 is provided with an imaging apparatus (a document camera 100) for imaging a subject and an image display device (a projector 200) for inputting captured image information and displaying an image based on the image information. The imaging apparatus comprises: a magnification change part for changing the imaging magnification of the subject; a magnification detection part (a support arm length detection part 115) for detecting the imaging magnification as imaging magnification information; and a transmission part (a control signal transmission part 116 and a USB communication part 119) for transmitting the imaging magnification information to the image display device. The image display device comprises: a receiving part (a USB communication part 230) for receiving the imaging magnification information; a scale image generation part (a control part 220 and an OSD processing part 232) for generating a scale image that is an image expressing a scale on the basis of the imaging magnification information; and a superimposing part (the OSD processing portion 232) for superimposing the scale image on the image based on the image information.

Description

  The present invention relates to an image display system, an imaging apparatus, an image display system control method, and an imaging apparatus control method.

  2. Description of the Related Art Conventionally, there has been known an image display system in which an imaging device (for example, a document camera) and an image display device (for example, a projector) are connected in a presentation or the like and an image captured by the imaging device is displayed by the image display device. Yes. When using such an image display system, there is a case where it is desired to measure the size of a subject (imaging target) included in an image captured by an imaging device and displayed on the image display device.

  In order to measure the size of the subject, there is a method of imaging by setting a comparison object such as a ruler in the vicinity of the subject. However, in such a method, there is a problem that it is necessary to prepare a comparison object in advance, which takes time. On the other hand, Patent Document 1 discloses a document camera that stores angle-of-view information according to a standard size of a subject and adjusts a zoom and focus state of an electric lens according to a desired standard size selected by a user. Yes.

JP 2000-235226 A

  In such a document camera, since the user selects a standard size by himself, it is possible to estimate the approximate size of the subject, but it is difficult to measure the exact size. Therefore, there has been a demand for an image display system that can easily measure the size of a subject included in an image captured by an imaging device and displayed on an image display device.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 An image display system according to this application example includes an imaging device that captures an image of an object, an image display device that inputs image information captured by the imaging device, and displays an image based on the image information. The imaging apparatus includes: a magnification changing unit for changing the imaging magnification of the subject; and a magnification for detecting the imaging magnification changed by the magnification changing unit as imaging magnification information. A detection unit; and a transmission unit that transmits the imaging magnification information to the image display device. The image display device receives the imaging magnification information transmitted from the imaging device; and the reception A scale image generating unit that generates a scale image that is an image representing a scale based on the imaging magnification information received by the unit; and Parts and having a superimposing unit for superimposing the scaled image generated is.

  Such an image display system includes an imaging device and an image display device. The imaging device includes a magnification change unit, a magnification detection unit, and a transmission unit, and the image display device includes a reception unit, a scale image generation unit, and a superimposition unit. The magnification changing unit changes the imaging magnification of the subject. The magnification detection unit detects the imaging magnification as imaging magnification information. The transmission unit transmits the imaging magnification information to the image display device. The receiving unit receives imaging magnification information. The scale image generation unit generates a scale image, that is, a scale image, based on the imaging magnification information. The superimposing unit superimposes the scale image on the image. As a result, the user can measure the size of the subject by viewing the image on which the scale image displayed by the image display device is superimposed.

  Application Example 2 In the image display system according to the application example, the image display device further includes a scale table that stores correspondence between the imaging magnification information and a scale image size representing the size of the scale image, The scale image generation unit reads the scale image size corresponding to the imaging magnification information from the scale table, and generates the scale image based on the read scale image size.

  According to such an image display system, the image display apparatus has a scale table that stores the correspondence between the imaging magnification information and the scale image size. The scale image generation unit reads a scale image size corresponding to the imaging magnification information from the scale table, and generates a scale image. Thereby, by providing the scale table, the image display apparatus can easily calculate the scale image size.

  Application Example 3 In the image display system according to the application example, the image display device further includes a partial enlargement unit for partially enlarging the image, and the partial enlargement unit performs partial enlargement. Then, the scale image generation unit generates the scale image enlarged at the same enlargement ratio as the partial enlargement, and the superimposing unit outputs the scale image enlarged to the partially enlarged image. It is characterized by overlapping.

  According to such an image display system, the image display device has the partial enlargement means. When partial enlargement is performed, the scale image generation unit generates an enlarged scale image, and the superimposition unit superimposes the enlarged scale image. Thus, even when partial enlargement is performed, the scale image has a scale size that is linked to the enlargement ratio, and the user can correctly measure the size of the subject.

  Application Example 4 In the image display system according to the application example, the scale image generation unit further generates a ruled line image representing a ruled line, and the superimposing unit superimposes the scale image and the ruled line image on the image. It is characterized by that.

  According to such an image display system, the scale image generation unit further generates a ruled line image. The superimposing unit superimposes the scale image and the ruled line image on the image. Thereby, since the scale image and the ruled line image are displayed on the image, the size of the subject can be easily measured.

  Application Example 5 An imaging apparatus according to this application example is an imaging apparatus that captures an image of a subject and outputs captured image information, and a magnification changing unit that changes an imaging magnification of the subject, and the magnification change A magnification detection unit that detects the imaging magnification changed by the unit as imaging magnification information, a scale image generation unit that generates scale image information that is image information representing a scale based on the imaging magnification information, and the captured image A superimposing unit that superimposes the scale image information generated by the scale image generating unit on the information.

  According to such an imaging apparatus, it has a magnification changing unit, a magnification detecting unit, a scale image generating unit, and a superimposing unit. The magnification changing unit changes the imaging magnification of the subject. The magnification detection unit detects the imaging magnification as imaging magnification information. The scale image generation unit generates scale image information, that is, scale image information based on the imaging magnification information. The superimposing unit superimposes the scale image information on the image information. Thereby, the size of the subject can be measured based on the image information output from the imaging apparatus.

  Application Example 6 The image display system control method according to this application example includes a magnification change unit for changing the imaging magnification of the subject, and the imaging device that captures the subject and the imaging device An image display device that inputs image information and displays an image based on the image information, wherein the imaging device is changed by the magnification changing unit. And a transmission step for transmitting the imaging magnification information to the image display device. The image display device receives the imaging magnification information transmitted from the imaging device. A receiving step for receiving, and a scale image generation for generating a scale image that is an image representing a scale based on the imaging magnification information received by the receiving step. A method, characterized by having a, a superimposition step of superimposing the scale image generated by the scale image generating step to the image based on the image information.

  According to such a control method of the image display system, the user can measure the size of the subject by viewing the image on which the scale image displayed by the image display device is superimposed.

  Application Example 7 An imaging apparatus control method according to this application example includes an imaging apparatus that includes a magnification changing unit for changing an imaging magnification of a subject, images the subject, and outputs captured image information. A magnification detection step for detecting the imaging magnification changed by the magnification change unit as imaging magnification information, and a scale for generating scale image information that is image information representing a scale based on the imaging magnification information An image generating step; and a superimposing step of superimposing the scale image information generated by the scale image generating step on the captured image information.

  According to such a control method of the imaging apparatus, the size of the subject can be measured based on the image information output from the imaging apparatus.

  When the above-described image display system, imaging device, image display device, and control method thereof are constructed using a computer provided in the imaging device and the image display device, the form and the application example are as follows. It is also possible to configure in a form such as a program for realizing the function, or a recording medium in which the program is recorded so as to be readable by the computer. Recording media include flexible disk, HDD (Hard Disk Drive), CD-ROM (Compact Disk Read Only Memory), DVD (Digital Versatile Disk), Blu-ray Disc (registered trademark), magneto-optical disk, nonvolatile memory card Various kinds of computers that can be read by the computer, such as an internal storage device (semiconductor memory such as RAM (Random Access Memory) and ROM (Read Only Memory)) and an external storage device (USB memory, etc.) Media can be used.

It is a figure which shows the document camera with which the image display system which concerns on 1st Embodiment is equipped, and a projector, (a) is a perspective view which shows the state which expand | extends the support arm of a document camera and projects the image, FIG. 6B is a perspective view showing a state in which an image is projected by shortening the support arm of the document camera. FIG. 4A is a plan view showing a projected image, where FIG. 5A is a plan view of the projected image when the support arm of the document camera is extended, and FIG. 5B is a projection when the support arm of the document camera is shortened. The top view of an image. The block diagram which shows schematic structure of a document camera and a projector. Explanatory drawing of a scale table. It is explanatory drawing for demonstrating an electronic zoom function, (a) is a top view of the projection image before electronic zoom expansion is performed, (b) is the plane of the projection image in the state where electronic zoom expansion was performed. Figure. The flowchart which shows the scale image display process by a document camera and a projector. It is a top view showing a projection image at the time of performing scale image display processing, and (a) is a top view of a projection image when a support arm is extended and an enlargement ratio of electronic zoom is 1.0 times. (B) is a plan view of a projected image when the support arm is shortened and the enlargement ratio of the electronic zoom is 1.0, and (c) is an enlargement ratio of the electronic zoom when the support arm is shortened. FIG. 6 is a plan view of a projected image when is 2.0 times. The block diagram which shows schematic structure of the document camera which concerns on 2nd Embodiment. The flowchart which shows the scale image superimposition process by a document camera. The top view showing the projection image at the time of performing a scale image display process, without superimposing a ruled line image.

  Hereinafter, embodiments will be described.

(First embodiment)
In the first embodiment, an image display system will be described. In the first embodiment, an imaging apparatus of an image display system is described as a document camera, and the image display apparatus is described as a projector that projects an image based on an image signal onto an external screen or the like.

FIG. 1 is a diagram illustrating a document camera and a projector included in the image display system according to the first embodiment. FIG. 1A is a diagram illustrating an image projected by extending a support arm of the document camera. FIG. 1B is a perspective view illustrating a state in which an image is projected by shortening the support arm of the document camera.
As shown in FIG. 1, in the image display system 1 of the present embodiment, a document camera 100 and a projector 200 are connected via a USB cable C.

  The document camera 100 includes a box-shaped casing 110, a support arm 111 that extends upward from an end of the casing 110, and can be expanded and contracted, and an imaging unit 112 that is fixed to the upper end of the support arm 111. On the upper surface of the housing 110, a stage 110a as a rectangular placement unit as viewed from above (on the imaging unit 112 side) and an operation reception unit 113 including a plurality of operation keys are provided. On the stage 110a, a subject M such as a document can be placed.

  As shown in FIG. 1A, the imaging unit 112 can capture an image of the subject M by capturing an image in the direction of the stage 110a. Then, the document camera 100 transmits an image signal based on the image information captured by the imaging unit 112 to an external device (the projector 200 in the present embodiment) via the USB cable C. Further, the document camera 100 transmits the operation information input by the operation reception unit 113, the extension amount information of the support arm 111, and the like to the projector 200 as control signals.

  The projector 200 forms an image based on the input image signal and projects the image on an external projection surface SC (for example, a screen). In the present embodiment, an image based on an image signal input from the document camera 100, that is, an image captured by the imaging unit 112 is projected. In addition, the projector 200 can receive a control signal from the document camera 100, and the image display state of the projector 200 is controlled based on the control signal.

  As shown in FIG. 1A, when the support arm 111 of the document camera 100 is extended, the imaging unit 112 can image substantially the entire subject M on the stage 110a. Further, as shown in FIG. 1B, when the support arm 111 of the document camera 100 is shortened, the imaging unit 112 can magnify and capture a substantially central portion of the subject M on the stage 110a. it can. Images captured by the document camera 100 are projected as projection images G1 and G2 from the projector 200 onto the screen SC.

FIG. 2 is a plan view showing the projected image, FIG. 2A is a plan view of the projected image G1 when the support arm 111 of the document camera 100 is extended, and FIG. It is a top view of the projection image G2 in case the support arm 111 of the document camera 100 is shortened.
As shown in FIG. 2A, in the projection image G1, substantially the entire subject M is displayed. Further, as shown in FIG. 2B, the center portion of the subject M is enlarged and displayed in the projection image G2. The extendable support arm 111 corresponds to a magnification changing unit for changing the imaging magnification.

Next, a schematic configuration of the image display system 1 will be described.
FIG. 3 is a block diagram illustrating a schematic configuration of the document camera 100 and the projector 200.
As shown in FIG. 3, the document camera 100 includes a control unit 114, a support arm length detection unit 115, a control signal transmission unit 116, an image processing unit 117, an image in addition to the imaging unit 112 and the operation reception unit 113 described above. A transmission unit 118, a USB communication unit 119, and the like are provided.

  The control unit 114 includes a CPU (Central Processing Unit), a RAM (Random Access Memory) used for temporary storage of various data, a mask ROM (Read Only Memory), a flash memory, and a FeRAM (Ferroelectric RAM: ferroelectric memory). ) And the like (both not shown) and function as a computer. The control unit 114 performs overall control of the operation of the document camera 100 by the CPU operating according to a control program stored in a nonvolatile memory.

  The operation accepting unit 113 accepts an input operation from the user, and includes a plurality of operation keys for giving various instructions to the document camera 100. As operation keys provided in the operation accepting unit 113, in addition to a “power key” for switching power on / off, an “auto focus key” for performing autofocus, and a “power focus key” for causing the projector 200 to perform electronic zoom. There are an “electronic zoom enlargement key”, an “electronic zoom reduction key”, a “scale display key” for displaying a scale image, and the like. When the user operates various operation keys of the operation reception unit 113, the operation reception unit 113 receives this input operation and outputs operation information corresponding to the user's operation content to the control unit 114.

  The imaging unit 112 forms an image on the light receiving surface of the imaging element, and an imaging element (not shown) including a CCD (Charge Coupled Device) sensor, a CMOS (Complementary Metal Oxide Semiconductor) sensor, and the like, and the light reflected by the subject M. An imaging lens (not shown) is provided, and the range of the stage 110a can be imaged. A plurality of pixels (light receiving pixels) arranged in a matrix are formed on the light receiving surface of the image sensor, and the imaging unit 112 generates image information based on the amount of light received by each pixel at a predetermined frame rate. This image information is composed of a plurality of pixel values corresponding to all the pixels on the image sensor, and is sequentially sent to the image processing unit 117 via a cable (not shown) wired inside the support arm 111. Is output.

  The support arm length detection unit 115 includes an encoder, a potentiometer, and the like, and detects the extension amount of the support arm 111 as imaging magnification information based on an instruction from the control unit 114. The extension amount of the support arm 111 is the length of the support arm 111, and in this embodiment, represents the distance from the stage 110a to the imaging unit 112. Further, when the extension amount of the support arm 111 is not manually operated but is electrically driven by a driving device such as a stepping motor in response to a button operation or the like, for example, based on the number of steps of the stepping motor. It is also possible to adopt a mode in which the extension amount of the support arm 111 is detected. The support arm length detection unit 115 corresponds to a magnification detection unit.

  Based on an instruction from the control unit 114, the image processing unit 117 converts the image information input from the imaging unit 112 into an image signal in a format that can be used by the projector 200, and sends the converted image signal to the image transmission unit 118. Output.

  The image transmission unit 118 performs transmission control of the image signal input from the image processing unit 117 based on an instruction from the control unit 114. If there is an instruction from the control unit 114 to start transmission of the image signal, the image transmission unit 118 starts transmission of the image signal. If the control unit 114 instructs to stop the transmission of the image signal, the image transmission unit 118 stops the transmission of the image signal. The image signal is transmitted to the projector 200 via the USB communication unit 119 described later.

  The control signal transmission unit 116 transmits a control signal for controlling the image projection state of the projector 200 based on an instruction from the control unit 114. The type of control signal includes the extension amount information of the support arm 111, a scale display request signal for displaying a scale image, an electronic zoom enlargement request signal for performing electronic zoom, and an electronic zoom reduction request signal Etc. The control signal transmission unit 116 transmits these control signals to the projector 200 via the USB communication unit 119. Here, the control signal transmission unit 116 and the USB communication unit 119 correspond to a transmission unit.

  The USB communication unit 119 is a communication unit that conforms to the USB standard, and is connected to the external projector 200 via the USB cable C. The USB communication unit 119 transmits the image signal transmitted from the image transmission unit 118 and the control signal transmitted from the control signal transmission unit 116 to the projector 200 by USB data transmission.

  Here, the USB communication unit 119 is mounted with a USB function capable of transmitting an image signal to the projector 200 and a USB function capable of transmitting a control signal. As a result, the USB communication unit 119 can connect the document camera 100 and the projector 200 with one USB cable C.

Next, a schematic configuration of the projector 200 will be described.
As shown in FIG. 3, the projector 200 includes an image projection unit 210, a control unit 220, an operation reception unit 221, a light source control unit 222, a USB communication unit 230, an image processing unit 231, an OSD processing unit 232, and the like. ing.

  The image projection unit 210 includes a light source 211, three liquid crystal light valves 212R, 212G, and 212B as light modulation devices, a projection lens 213 as a projection optical system, a light valve drive unit 214, and the like. The image projection unit 210 modulates the light emitted from the light source 211 by the liquid crystal light valves 212R, 212G, and 212B to form image light, projects the image light from the projection lens 213, and displays it on the projection screen SC. .

  The light source 211 includes a discharge-type light source lamp 211a made of an ultra-high pressure mercury lamp, a metal halide lamp, or the like, and a reflector 211b that reflects light emitted from the light source lamp 211a toward the liquid crystal light valves 212R, 212G, and 212B. ing. Light emitted from the light source 211 is converted into light having a substantially uniform luminance distribution by an integrator optical system (not shown), and red (R), green (G), and blue that are the three primary colors of light by a color separation optical system (not shown). After being separated into each color light component of (B), it enters the liquid crystal light valves 212R, 212G and 212B, respectively.

  The liquid crystal light valves 212R, 212G, and 212B are configured by a liquid crystal panel in which liquid crystal is sealed between a pair of transparent substrates. In the liquid crystal light valves 212R, 212G, and 212B, a plurality of pixels (not shown) arranged in a matrix are formed, and a driving voltage can be applied to the liquid crystal for each pixel. When the light valve driving unit 214 applies a driving voltage corresponding to input image information to each pixel, each pixel is set to a light transmittance corresponding to the image information. For this reason, the light emitted from the light source 211 is modulated by passing through the liquid crystal light valves 212R, 212G, and 212B, and an image corresponding to the image information is formed for each color light. The formed color images are synthesized for each pixel by a color synthesis optical system (not shown) to form a color image, and then projected from the projection lens 213.

  The control unit 220 includes a CPU, a RAM used for temporary storage of various data, and a non-volatile memory such as a mask ROM, flash memory, and FeRAM (none of which are shown), and functions as a computer. is there. The control unit 220 performs overall control of the operation of the projector 200 by the CPU operating according to a control program stored in a nonvolatile memory. The control unit 220 includes a scale table T stored in a nonvolatile memory.

Here, the scale table T will be described.
FIG. 4 is an explanatory diagram of the scale table T. As shown in FIG. 4, the scale table T is a table representing the correspondence between the extension amount of the support arm 111 of the document camera 100 and the scale interval (scale interval). The extension amount of the support arm 111 is the extension amount information of the support arm 111 received from the document camera 100, and the unit is “cm”. The scale interval represents the number of dots on the projection screen corresponding to 1 cm of a scale image (scale image) for measuring the size of the subject. In the present embodiment, the extension amount of the support arm 111 can be expanded and contracted from 10 cm to 20 cm, and the corresponding scale interval is displayed from 42 dots to 20 dots. Note that the scale interval of the scale table T corresponds to the scale image size.

  Returning to FIG. 3, when the extension amount information of the support arm 111 is received together with the scale display request signal from the document camera 100, the control unit 220 of the projector 200 corresponds to the extension amount length of the support arm 111 of the document camera 100 from the scale table T. Read the scale interval. Then, the control unit 220 causes the OSD processing unit 232 described later to display a scale image based on the read scale interval.

  The operation accepting unit 221 accepts an input operation from the user, and includes a plurality of operation keys for the user to give various instructions to the projector 200. The operation keys included in the operation reception unit 221 include a “power key” for switching on / off the power, a “menu key” for switching display / non-display of a menu screen for performing various settings, and a cursor on the menu screen. There are a “cursor key” used for movement and the like, a “decision key” for determining various settings, and the like. When the user operates (presses) various operation keys of the operation reception unit 221, the operation reception unit 221 receives this input operation and outputs operation information corresponding to the user's operation content to the control unit 220. The operation receiving unit 221 may be configured using a remote control (not shown) capable of remote operation. In this case, the remote control transmits infrared operation information corresponding to the user's operation content, and a remote control signal receiving unit (not shown) receives this and transmits it to the control unit 220.

  The light source control unit 222 performs an insulation breakdown between an inverter (not shown) that converts a direct current generated by a power supply circuit (not shown) into an alternating current rectangular wave current, and an electrode of the light source lamp 211a. An igniter (not shown) for urging the start of 211 a is provided, and lighting of the light source 211 is controlled based on an instruction from the control unit 220. Specifically, the light source control unit 222 can turn on the light source 211 by starting the light source 211 and supplying predetermined power, and can turn off the light source 211 by stopping the supply of power. The light source control unit 222 can adjust the luminance (brightness) of the light source 211 by controlling the power supplied to the light source 211 based on an instruction from the control unit 220.

  The USB communication unit 230 is a communication unit that conforms to the USB standard, and is connected to the external document camera 100 via the USB cable C. The USB communication unit 230 receives an image signal and a control signal transmitted from the document camera 100 by USB data transmission. Here, the USB communication unit 230 corresponds to a receiving unit.

  Here, the USB communication unit 230 is mounted with a USB function capable of receiving an image signal from the document camera 100 and a USB function capable of receiving a control signal. Accordingly, the USB communication unit 230 can connect the projector 200 and the document camera 100 with one USB cable C.

  The image processing unit 231 converts the image signal received by the USB communication unit 230 into image information representing the gradation of each pixel of the liquid crystal light valves 212R, 212G, and 212B. Here, the converted image information is for each color light of R, G, and B, and is composed of a plurality of pixel values corresponding to all the pixels of the liquid crystal light valves 212R, 212G, and 212B. The pixel value determines the light transmittance of the corresponding pixel, and the intensity (gradation) of light emitted from each pixel is defined by the pixel value. Also, the image processing unit 231 performs image quality adjustment processing for adjusting brightness, contrast, sharpness, hue, and the like on the converted image information based on an instruction from the control unit 220, and the processed image information Is output to the OSD processing unit 232.

  The OSD processing unit 232 performs processing for superimposing an OSD (on-screen display) image such as a menu image or a message image on the input image information based on an instruction from the control unit 220. The OSD processing unit 232 includes an OSD memory (not shown), and stores OSD image information representing graphics, fonts, and the like for forming an OSD image. In the present embodiment, the OSD processing unit 232 stores and generates scale image information and ruled line image information.

  When the control unit 220 instructs the OSD image to be superimposed, the OSD processing unit 232 reads out necessary OSD image information from the OSD memory and performs image processing so that the OSD image is superimposed at a predetermined position on the projected image. The OSD image information is combined with the image information input from the unit 231. The image information combined with the OSD image information is output to the light valve driving unit 214. If there is no instruction to superimpose the OSD image from the control unit 220, the OSD processing unit 232 outputs the image information input from the image processing unit 231 to the light valve driving unit 214 as it is. The control unit 220 and the OSD processing unit 232 correspond to a scale image generation unit, and the OSD processing unit 232 corresponds to a superimposition unit.

  When the light valve driving unit 214 drives the liquid crystal light valves 212R, 212G, and 212B according to the image information input from the OSD processing unit 232, the liquid crystal light valves 212R, 212G, and 212B form images according to the image information, This image is projected from the projection lens 213.

Here, the electronic zoom function will be described. The image display system 1 of the present embodiment, that is, the document camera 100 and the projector 200, partially outputs a projected image in response to an operation of an “electronic zoom enlargement key” or “electronic zoom reduction key” provided in the operation reception unit 113 of the document camera 100. It has an electronic zoom function that can be enlarged. The electronic zoom function corresponds to the partial enlargement means.
FIG. 5 is an explanatory diagram for explaining the electronic zoom function, FIG. 5A is a plan view of a projected image before electronic zoom enlargement, and FIG. 5B is an electronic zoom enlargement. FIG. 6 is a plan view of a projected image in a state in which is performed.

  As shown in FIGS. 5A and 5B, the electronic zoom function is based on a control signal from the document camera 100, and a part of the input image Gi input from the document camera 100 to the projector 200 (for example, This is a function for enlarging (partially enlarging) and displaying the range Gz1). In the present embodiment, it is possible to change the enlargement ratio in 25 stages ranging from 1 to 4 times based on the state where the entire input image Gi is displayed (see FIG. 5A). Yes. The control unit 220 outputs any value from 0 to 24 to the image processing unit 231 as a setting value (zoom setting value) of the electronic zoom function, and the image processing unit 231 has a partial range of the input image Gi. The image information is corrected so as to be displayed at an enlargement ratio corresponding to the zoom setting value input from the control unit 220. For example, when the zoom setting value is 0, the image processing unit 231 displays the entire input image Gi while keeping the enlargement ratio at 1.0 (no correction). Further, the image processing unit 231 increases the enlargement ratio as the zoom setting value increases, and when the zoom setting value is the maximum value (24), enlarges a partial range of the input image Gi by 4.0 times. To display.

  The user can increase or decrease the enlargement ratio by operating the “electronic zoom enlargement key” and “electronic zoom reduction key” provided in the operation reception unit 113 of the document camera 100. When the user operates the electronic zoom enlargement key, the control unit 114 of the document camera 100 instructs the control signal transmission unit 116 to transmit the electronic zoom enlargement request signal to the projector 200.

  When the control unit 220 of the projector 200 receives the electronic zoom enlargement request signal, the control unit 220 outputs a value obtained by adding 1 to the previous zoom setting value to the image processing unit 231 as a new zoom setting value, and increases the enlargement ratio by one step. To do. On the other hand, when the user operates the electronic zoom reduction key, the control unit 114 of the document camera 100 instructs the control signal transmission unit 116 to transmit the electronic zoom reduction request signal to the projector 200. The control unit 220 of the projector 200 outputs a value obtained by subtracting 1 from the previous zoom setting value to the image processing unit 231 as a new zoom setting value, and reduces the enlargement ratio by one step. Note that the control unit 220 determines that when the reduction key is operated when the zoom setting value is the minimum value (0) and when the enlargement key is operated when the zoom setting value is the maximum value (24), Do not change the zoom setting.

  The image processing unit 231 interpolates pixel values for image information input thereafter so that a partial range of the input image Gi is enlarged at an enlargement rate corresponding to the zoom setting value input from the control unit 220. Do.

  The document camera 100 and the projector 200 of the image display system 1 have the electronic zoom function as described above, and the user operates the electronic zoom enlargement key and the electronic zoom reduction key provided in the operation reception unit 113. The enlargement ratio at the time of partial enlargement of the input image Gi can be changed.

Next, scale image display processing by the document camera 100 and the projector 200 will be described.
FIG. 6 is a flowchart showing scale image display processing by the document camera 100 and the projector 200. When the projector 200 is projecting an image input from the document camera 100 and the scale display key provided in the operation accepting unit 113 of the document camera 100 is pressed, the projector 200 adds a scale image to the input image. Superimpose and project.

  Specifically, in the document camera 100, when the scale display key provided in the operation receiving unit 113 is pressed, the control unit 114 instructs the support arm length detection unit 115 to detect the extension amount of the support arm 111. And input the detected extension amount (step S101). The control unit 114 instructs the control signal transmission unit 116 to transmit the scale display request signal and the expansion amount information to the projector 200 via the USB communication unit 119 (step S102). Then, the scale image display process by the document camera 100 is terminated.

  In the projector 200, the control unit 220 receives the scale display request signal and the expansion amount information via the USB communication unit 230 (step S201). The control unit 220 acquires a scale interval (dot) corresponding to the extension amount information of the support arm 111 from the scale table T (step S202). Next, the control unit 220 acquires the enlargement ratio of the electronic zoom (step S203).

  The control unit 220 multiplies the scale interval by the enlargement ratio of the electronic zoom (step S204). The control unit 220 instructs the OSD processing unit 232 to generate a scale image and a ruled line image corresponding to the multiplied scale interval, that is, the scale interval (step S205). Then, the control unit 220 instructs the OSD processing unit 232 to superimpose the generated scale image and ruled line image on the image information input from the image processing unit 231 (step S206). Note that when the enlargement setting is made by the electronic zoom function, the image information is enlarged by the image processing unit 231 at an enlargement rate corresponding to the zoom setting value. Therefore, the scale image and the ruled line image are superimposed on the image information enlarged in this way. Then, the scale image display process by the projector 200 ends.

  FIG. 7 is a plan view showing a projected image when the scale image display process is performed. FIG. 7A shows the case where the support arm 111 is extended and the electronic zoom magnification is 1.0 times. FIG. 7B is a plan view of the projected image when the support arm 111 is shortened and the magnification of the electronic zoom is 1.0 times, and FIG. ) Is a plan view of a projected image when the support arm 111 is shortened and the magnification of the electronic zoom is 2.0 times.

  As shown in FIGS. 7A, 7B, and 7C, in the projected images G3, G4, and G5, scale images S1, S2, and S3 representing scales (scales), and ruled line images representing ruled lines, respectively. K1, K2, and K3 are displayed. In the present embodiment, the scale images S1, S2, S3 are displayed on the upper side and the left side of the projected images G3, G4, G5. The ruled line images K1, K2, and K3 are displayed as grid lines in the vertical and horizontal directions every other scale of the scale images S1, S2, and S3 of the projection images G3, G4, and G5. Note that the display patterns of the ruled line images K1, K2, and K3 are not limited to such a grid-like display pattern.

  As shown in FIG. 7A, in the projection image G3, the extension amount of the support arm 111 is 20 cm, and the enlargement ratio of the electronic zoom is 1.0, and the scale interval at this time is 20 dots. . As shown in FIG. 7B, in the projection image G4, the extension amount of the support arm 111 is 10 cm, and the enlargement ratio of the electronic zoom is 1.0, and the scale interval at this time is 42 dots. . As shown in FIG. 7C, in the projection image G5, the extension amount of the support arm 111 is 10 cm, the enlargement ratio of the electronic zoom is 2.0 times, and the scale interval at this time is 84 dots. .

  As described above, the image display system 1 can superimpose the scale image and the ruled line image on the captured image.

According to the first embodiment described above, the following effects can be obtained.
(1) In the image display system 1, the document camera 100 can change the imaging magnification of the subject M by shortening or extending the support arm 111. When the scale display key is pressed, the document camera 100 transmits the extension amount information of the support arm 111 to the projector 200. The projector 200 generates a scale image (S1, S2, S3) based on the expansion amount information, and superimposes it on the image input from the document camera 100 and projects it. Accordingly, the user can visually observe the scale image (S1, S2, S3) of the projection image (G3, G4, G5) without installing a ruler or the like in the vicinity of the subject M. Can be easily measured.

  (2) In the image display system 1, the projector 200 has a scale table T. Then, based on the scale interval acquired from the scale table T, the control unit 220 causes the OSD processing unit 232 to generate scale images (S1, S2, S3) and superimposes them on the image information. Thus, by providing the scale table T, the projector 200 can easily calculate the scale interval of the scale images (S1, S2, S3), and the processing load on the projector 200 can be reduced. .

  (3) In the image display system 1, when the electronic zoom is performed, the projector 200 enlarges the scale image (S1, S2, S3) according to the enlargement ratio. As a result, the scale image (S1, S2, S3) has a scale that is linked to the enlargement ratio, and the size of the subject M can be measured correctly.

  (4) In the image display system 1, the projector 200 generates ruled line images (K1, K2, K3), superimposes them on the image information, and projects them. As a result, the ruled line images (K1, K2, K3) are displayed on the projected images (G3, G4, G5) in addition to the scale images (S1, S2, S3). Measurement can be performed easily.

(Second Embodiment)
In the second embodiment, a document camera will be described as an embodiment of an imaging apparatus that outputs an image signal on which a scale image is superimposed. The image signal output from the document camera is input to the projector, and an image based on the image signal is projected.

  The appearance of the document camera 300 according to the second embodiment is the same as that of the document camera 100 (see FIG. 1) in the image display system 1 according to the first embodiment. Therefore, the description is omitted. In the second embodiment, the projector 400 that projects an image is a general-purpose projector.

Next, a schematic configuration of the document camera 300 will be described.
FIG. 8 is a block diagram illustrating a schematic configuration of the document camera 300 according to the second embodiment.
As shown in FIG. 8, the document camera 300 includes an imaging unit 112, an operation receiving unit 313, a control unit 314, a support arm length detection unit 115, an image processing unit 317, an OSD processing unit 318, an image transmission unit 118, and a USB communication unit. 119 etc. are comprised.

  The imaging unit 112, the support arm length detection unit 115, the image transmission unit 118, and the USB communication unit 119 of the document camera 300 have the same configuration as the document camera 100 according to the first embodiment, and are denoted by the same reference numerals. ing. Therefore, the description is omitted.

  The control unit 314 includes a CPU, a RAM used for temporary storage of various data, and a non-volatile memory such as a mask ROM, flash memory, and FeRAM (all not shown), and functions as a computer. is there. The control unit 314 performs overall control of the operation of the document camera 300 as the CPU operates according to a control program stored in a nonvolatile memory. Further, the control unit 314 includes a scale table T stored in a nonvolatile memory. The scale table T is a table similar to the scale table T provided in the control unit 220 of the projector 200 of the first embodiment.

  The operation accepting unit 313 accepts an input operation from the user, and includes a plurality of operation keys for performing various instructions to the document camera 300. The operation keys provided in the operation accepting unit 313 include a “power key” for switching power on / off, an “auto focus key” for performing autofocus, and an “electronic zoom enlargement key” for performing electronic zoom. ”,“ Electronic zoom reduction key ”,“ scale display key ”for superimposing scale images, and the like. When the user operates various operation keys of the operation reception unit 313, the operation reception unit 313 receives this input operation and outputs operation information corresponding to the user's operation content to the control unit 314.

  Based on an instruction from the control unit 314, the image processing unit 317 converts the image information input from the imaging unit 112 into image information in a format that can be used by the projector 400, and sends the converted image information to the OSD processing unit 318. Output. Further, the document camera 300 is an electronic device capable of partially enlarging and outputting a captured image in response to an operation of an “electronic zoom enlargement key” or an “electronic zoom reduction key” provided in the operation reception unit 313. Has a zoom function. Here, the image processing unit 317 corrects the image information so that a partial range of the image is output at an enlargement ratio corresponding to the zoom setting value input from the control unit 314.

  The OSD processing unit 318 performs processing for superimposing an OSD image such as a menu image or a message image on the image information input from the image processing unit 317 based on an instruction from the control unit 314. The OSD processing unit 318 includes an OSD memory (not shown), and stores image information representing graphics, fonts, and the like for forming an OSD image. In the present embodiment, the OSD processing unit 318 stores and generates scale image information and ruled line image information.

  When the control unit 314 instructs the superimposition of the OSD image, the OSD processing unit 318 reads out necessary OSD image information from the OSD memory and superimposes the OSD image at a predetermined position on the output image. The OSD image information is combined with the image information input from 317. The image information combined with the OSD image information is output to the image transmission unit 118. If there is no instruction to superimpose the OSD image from the control unit 314, the OSD processing unit 318 outputs the image input from the image processing unit 317 to the image transmission unit 118 as it is. Here, the control unit 314 and the OSD processing unit 318 correspond to a scale image generation unit, and the OSD processing unit 318 corresponds to a superimposition unit.

Next, scale image superimposition processing by the document camera 300 will be described.
FIG. 9 is a flowchart showing scale image superimposition processing by the document camera 300. When the document camera 300 outputs an image signal to the projector 400, when the scale display key provided in the operation reception unit 313 of the document camera 300 is pressed, the document camera 300 receives the image signal on which the scale image is superimposed. Output.

  Specifically, in the document camera 300, when the scale display key provided in the operation reception unit 313 is pressed, the control unit 314 issues an instruction to the support arm length detection unit 115 to detect the extension amount of the support arm 111. And input the detected extension amount (step S301). The control unit 314 acquires a scale interval corresponding to the extension amount of the support arm 111 from the scale table T (step S302). Next, the control unit 314 acquires the enlargement ratio of the electronic zoom (step S303).

  The control unit 314 multiplies the scale interval by the enlargement ratio of the electronic zoom (step S304). The control unit 314 instructs the OSD processing unit 318 to generate a scale image and a ruled line image corresponding to the multiplied scale interval, that is, the scale interval (step S305). Then, the control unit 314 instructs the OSD processing unit 318 to superimpose the generated scale image and ruled line image on the image information input from the image processing unit 317 (step S306). Note that, when the enlargement setting is performed by the electronic zoom function, the captured image is enlarged by the image processing unit 317 at an enlargement ratio corresponding to the zoom setting value. Therefore, the scale image and the ruled line image are superimposed on the image information enlarged in this way. Then, the scale image superimposing process by the document camera 300 is ended.

  When the scale image superimposing process is performed by the document camera 300, the projection image projected by the projector 400 is the same as the projection image (G3, G4, G5) of FIG. Therefore, the description is omitted.

  As described above, the document camera 300 can superimpose the scale image and the ruled line image on the captured image.

According to the second embodiment described above, the following effects can be obtained.
(1) The document camera 300 can change the imaging magnification of the subject M by shortening or extending the support arm 111. When the scale display key is pressed, the document camera 300 generates a scale image (S1, S2, S3) based on the imaging magnification, superimposes it on the image information, and outputs an image signal based on the image information. Output to the projector 400. Thus, the user can easily measure the size of the subject M by visually observing the scale images (S1, S2, S3) of the projection images (G3, G4, G5) projected from the projector 400. .

  (2) The document camera 300 has a scale table T. Then, the control unit 314 causes the OSD processing unit 318 to generate a scale image (S1, S2, S3) based on the scale interval acquired from the scale table T, and superimposes it on the image information. Thus, by providing the scale table T, the document camera 300 can easily calculate the scale interval of the scale images (S1, S2, S3), and the processing load on the document camera 300 can be reduced. Can do.

  (3) When the electronic zoom is performed, the document camera 300 enlarges the scale image according to the enlargement ratio. As a result, the scale image (S1, S2, S3) has a scale that is linked to the enlargement ratio, and the size of the subject M can be measured correctly.

  (4) The document camera 300 generates ruled line images (K1, K2, K3), superimposes them on the image information, and outputs an image signal based on the image information to the projector 400. As a result, the ruled line images (K1, K2, K3) are displayed on the projected images (G3, G4, G5) in addition to the scale images (S1, S2, S3). Measurement can be performed easily.

  In addition, it is not limited to embodiment mentioned above, It is possible to implement by adding various change, improvement, etc. A modification will be described below.

(Modification 1) In the above embodiment, the ruled line images (K1, K2, K3) are superimposed on the image information, but the ruled line images (K1, K2, K3) may not be superimposed.
FIG. 10 is a plan view showing a projected image when the scale image display process is performed without superimposing the ruled line image K1. In FIG. 10, the projection image G6 represents the projection image when the support arm 111 is extended to 20 cm and the enlargement ratio of the electronic zoom is 1.0, and the scale image S1 is displayed.

  (Modification 2) In the above embodiment, the scale interval represents 1 cm. However, the present invention is not limited to this. For example, the unit may be 2 cm. Further, the scale interval may be displayed as a numerical value on the projection screen. For example, when the scale interval is 1 cm, a display such as “scale interval = 1 cm” may be displayed on the upper right side of the projection screen. In this way, the user can easily recognize the interval of the scale marks.

  (Modification 3) In the above embodiment, the unit of the scale interval is fixed, but the unit of the scale interval may be variable. For example, when enlarging and projecting an image, the scale interval may be fine. Specifically, when the scale interval that was 1 cm is doubled, it may be 0.5 cm. In this way, when the image is enlarged, the size of the subject M can be measured more finely. In this case, it is preferable to display the scale interval as a numerical value on the projection screen.

  (Modification 4) In the above-described embodiment, the document camera 100 (300) changes the imaging magnification of the subject M by extending and retracting the support arm 111. However, the document camera 100 (300) includes the imaging unit 112. The optical zoom function (not shown) may be provided. The imaging magnification may be changed by using the optical zoom function to obtain imaging magnification information. In this case, the optical zoom function corresponds to the magnification changing unit.

  (Modification 5) In the above embodiment, the document camera 100 (300) is provided with the stage 110a, but may be a document camera without a stage.

  (Modification 6) In the above embodiment, the projector 200 or the document camera 300 is provided with the scale table T. However, instead of the scale table T, a function representing the relationship between the extension amount of the support arm 111 and the scale interval is provided. The scale interval may be calculated from the extension amount of the support arm 111 using the function.

  (Modification 7) In the above embodiment, the document camera 100 (300) is described as an example of the imaging device, but the imaging device is not limited to the document camera. For example, it can be applied to a scanner or the like.

  (Modification 8) In the first embodiment, the projector 200 is described as an example of the image display device of the image display system 1, but the image display device is not limited to the projector. For example, the present invention can be applied to a rear projector, a plasma display, an organic EL (Electro Luminescence) display, and the like that are integrally provided with a transmission screen.

  (Modification 9) In the above embodiment, the light source 211 is constituted by the discharge-type light source lamp 211a, but a solid light source such as an LED (Light Emitting Diode) light source or a laser, or other light sources can also be used. .

  (Modification 10) In the above embodiment, the projector 200 uses the transmissive liquid crystal light valves 212R, 212G, and 212B as the light modulators. However, the projector 200 uses a reflective light modulator such as a reflective liquid crystal light valve. It is also possible to use. In addition, it is possible to use a micromirror array device that modulates light emitted from a light source by controlling the emission direction of incident light for each micromirror as a pixel.

  DESCRIPTION OF SYMBOLS 1 ... Image display system, 100 ... Document camera, 110 ... Housing | casing, 110a ... Stage, 111 ... Support arm, 112 ... Imaging part, 113 ... Operation reception part, 114 ... Control part, 115 ... Support arm length detection part, 116 ... Control signal transmission unit, 117 ... Image processing unit, 118 ... Image transmission unit, 119 ... USB communication unit, 200 ... Projector, 210 ... Image projection unit, 211 ... Light source, 211a ... Light source lamp, 211b ... Reflector, 212R, 212G , 212B ... Liquid crystal light valve, 213 ... Projection lens, 214 ... Light valve driving unit, 220 ... Control unit, 221 ... Operation receiving unit, 222 ... Light source control unit, 230 ... USB communication unit, 231 ... Image processing unit, 232 ... OSD processing unit, 300 ... document camera, 313 ... operation accepting unit, 314 ... control unit, 318 ... OSD processing unit, 400 Projector.

Claims (7)

An image display system comprising: an imaging device that images a subject; and an image display device that inputs image information captured by the imaging device and displays an image based on the image information,
The imaging device
A magnification changing unit for changing the imaging magnification of the subject;
A magnification detection unit that detects the imaging magnification changed by the magnification change unit as imaging magnification information;
A transmission unit for transmitting the imaging magnification information to the image display device;
Have
The image display device includes:
A receiving unit for receiving the imaging magnification information transmitted from the imaging device;
A scale image generation unit that generates a scale image that is an image representing a scale based on the imaging magnification information received by the reception unit;
A superimposing unit that superimposes the scale image generated by the scale image generating unit on the image based on the image information;
An image display system comprising: The image display system according to claim 1,
The image display device includes:
A scale table storing correspondence between the imaging magnification information and the scale image size representing the size of the scale image;
The scale image generation unit reads the scale image size corresponding to the imaging magnification information from the scale table, and generates the scale image based on the read scale image size. The image display system according to claim 1 or 2,
The image display device includes:
A partial enlargement means for partially enlarging the image;
When the partial enlargement is performed by the partial enlargement unit, the scale image generation unit generates the scale image enlarged at the same enlargement ratio as the partial enlargement, and the superimposing unit partially enlarges. An enlarged image of the scale image is superimposed on the image. The image display system according to any one of claims 1 to 3,
The scale image generation unit further generates a ruled line image representing a ruled line,
The image display system, wherein the superimposing unit superimposes the scale image and the ruled line image on the image. An imaging device that images a subject and outputs the captured image information,
A magnification changing unit for changing the imaging magnification of the subject;
A magnification detection unit that detects the imaging magnification changed by the magnification change unit as imaging magnification information;
A scale image generating unit that generates scale image information that is image information representing a scale based on the imaging magnification information;
A superimposing unit that superimposes the scale image information generated by the scale image generating unit on the captured image information;
An imaging apparatus comprising: An image display having a magnification changing unit for changing the imaging magnification of the subject, inputting the image information captured by the imaging device, and displaying an image based on the image information A method for controlling an image display system comprising:
The imaging device
A magnification detecting step for detecting the imaging magnification changed by the magnification changing unit as imaging magnification information;
A transmission step of transmitting the imaging magnification information to the image display device;
Have
The image display device includes:
A reception step of receiving the imaging magnification information transmitted from the imaging device;
A scale image generation step for generating a scale image that is an image representing a scale based on the imaging magnification information received by the reception step;
A superimposing step of superimposing the scale image generated by the scale image generating step on the image based on the image information;
A control method for an image display system, comprising: A method for controlling an imaging apparatus, comprising: a magnification changing unit for changing an imaging magnification of a subject, imaging the subject, and outputting captured image information,
A magnification detecting step for detecting the imaging magnification changed by the magnification changing unit as imaging magnification information;
A scale image generation step of generating scale image information which is image information representing a scale based on the imaging magnification information;
A superimposing step of superimposing the scale image information generated by the scale image generating step on the captured image information;
An image pickup apparatus control method comprising:

Images