JPS6348233B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for photographing images displayed on a display, and is primarily directed to an apparatus for photographing tomographic images in an ultrasonic diagnostic apparatus.

As is well known, an ultrasound diagnostic device emits an ultrasound beam toward a living body, receives ultrasound echoes reflected from acoustically foreign substances within the living body, and uses the intensity of these echoes to display images such as CRT displays. This device displays the position of an echo by applying brightness modulation and obtains a tomographic image of a living body by repeating this operation. In such an ultrasonic diagnostic apparatus, it is important to record the tomographic image displayed on the display by photographing or the like.

By the way, since it is necessary to always position the image displayed on the display in a position where it is easy to take a photograph, by applying a predetermined DC bias to the image display device, the image can be set as shown in Figure 1. The device is equipped with a function that allows the position of the image 2 displayed on the display 1 to be moved in the X direction and the Y direction. In addition, because the film used for photography is expensive, or because it is necessary to compare and observe different areas to be examined, generally two pieces of film 3 are used in one film 3 as shown in Fig. 2. Image 1,
A method is adopted in which two images are taken side by side. still,
2A shows a case where the scan direction of the scanning line on the display is A (vertical direction), and FIG. 2B shows a case where the scan direction is B (horizontal direction). Furthermore, when making a diagnosis, it is necessary to capture a wide area or only a portion of the diagnosis area, so a so-called scale factor (also called SF), which can vary the magnification of the displayed image, is used. For example, as shown in Figure 3 a to c, SF3 → SF
A device with a function of enlarging the image by switching from 2 to SF1 is used.

However, in the conventional device described above,
Adjustment of the position of the displayed image was done by manually operating a control dial provided on the control panel, based on the operator's intuition and experience, resulting in poor positioning accuracy and poor shooting conditions. changes (e.g. changes in the number of images recorded on the film,
(changes in the scan direction and changes in the magnification rate of the scale factor), it is necessary to make adjustments each time, which is troublesome.

The present invention has been made to solve the above problems, and improves positioning accuracy and simplifies operation by automatically positioning the displayed image at a desired position when taking a photo. The object of the present invention is to provide a display image photographing device that can be used to display images.

The present invention will be specifically explained below using Examples.

FIG. 4 is a block diagram showing one embodiment of the apparatus of the present invention. 4 and 5 are multiplexers A and B, and the first stage multiplexer A receives the signal from the external control switch, the signal from the scale factor (SF) changeover switch, and the signal from the control signal generation circuit 7 of the camera 6. XY from continuously variable DC bias means 8 which is controlled by hand and is used as a control signal.
Position signal and separately provided X-direction DC bias circuit 9 and Y-direction DC bias circuit 1
The output from 0 is input, and the X bias signal and Y
It is designed to output a bias signal. or,
The second-stage multiplexer B receives the same control signal as described above, receives the output of the multiplexer A, and the separately provided X-direction DC bias circuit 11 and Y-direction DC bias circuit 12, and receives the X-direction bias A signal and a Y bias signal are applied to the display 1. still,
The second stage multiplexer B is activated by the output of the scan switching circuit 13 when the scanning direction of the scanning lines of the display 1 is switched to the horizontal direction. Here, the first stage multiplexer A is mainly controlled by a signal from an external control switch. That is, when this external control switch is OFF, the bias signal from the manually operated continuously variable DC bias means 8 is passed, and when the external control switch is ON, the signal from the continuously variable DC bias means is blocked. Instead, X and Y direction DC bias circuits 9 and 10
It is designed to output signals from. The second stage multiplexer B normally passes the output signal from the multiplexer A, but
When an output signal is applied from the scan switching circuit 13, the output signal from the multiplexer A is blocked, and bias signals from the X-direction and Y-direction DC bias circuits 11 and 12 are output based on the control signal. Operate. Furthermore, the camera control signal includes a strobe signal that is generated in synchronization with the start of shooting, and a bias change signal that is generated in synchronization with a camera drive signal for driving the camera shutter that is generated in synchronization with the strobe signal. There is.
Furthermore, the multiplexer A is configured to switch the X-direction bias signal to positive or negative polarity in synchronization with the falling edge of the bias change signal if the bias change signal is applied when the ON signal of the external control switch is applied. The multiplexer B has a function of switching the Y direction bias signal to positive or negative in synchronization with the fall of the bias change signal when the external control switch ON signal and the bias change signal are applied. Has a function. In addition, multiplexers A and B are display means scale factors (SF).
Signal status from the switch (enlargement rate status)
The DC bias value is changed by

Next, the operation of the device will be explained with reference to the timing chart shown in FIG. In this case, the display image at the beginning of the operation of the device is shown in FIG. 6a.
Examples will be given of cases in which they are placed at various positions as shown in FIGS.

First, when the external control switch is ON, the multiplexer A blocks the X and Y bias signals from the continuously variable bias means 8 and processes the bias signals from the X and Y direction DC bias circuits 9 and 10. Operate. At this time, when the strobe signal in the camera control signal becomes "L", the camera drive signal and bias change signal both rise to "H" in synchronization with this. At this time, since the polarity of the X-direction bias is set to be negative (-) by multiplexer A, the negative polarity X-direction bias passes through multiplexer B and is applied to display 1. Therefore, even if the display image 2A is at various positions as shown in FIGS. 6a and 6c, it is always positioned at the fixed position on the left side of the figure. By photographing at this stage, the left image 2A placed on the film 3 in FIG. 6e can be obtained (period t ₁ -t ₂ in FIG. 5). Here, when the bias change signal falls to the "L" level, the polarity of the bias is switched in synchronization with this and becomes positive (time _t3 in FIG. 5). Therefore, a positive X-direction bias signal passes through the multiplexer B and is applied to the display 1, so that even if the display image 2B is at various positions as shown in FIGS. It will now be positioned at a fixed position on the right side of the center. By photographing at this stage, the right image 2B in FIG. 6e can be obtained (period t ₄ to t ₅ in FIG. 5). Then, when the bias change signal falls to the "L" level again, the polarity of the bias changes to negative (time t ₆ in FIG. 5). When the external control switch is turned OFF, the operation of the multiplexer A is canceled, and then
The display position of the image on the display 1 is controlled by the bias based on the operation of the continuously variable bias means 8. At this stage, for example, a normal photograph can be obtained by positioning the displayed image at the center of the display and projecting that image over the entire sheet of film (period in Figure 5).
_t7 to _t8 ). In the above operation, the case where the scanning direction of the scanning line is vertical is described, but in the case of horizontal scanning, the second stage multiplexer B operates to obtain a photograph projected in two stages, upper and lower. be able to. That is, the scan switching circuit 13
The multiplexer B is operated by the output signal from the multiplexer B, and the same operation as described above is performed. In this case, the signal from multiplexer A is blocked by the ON signal from the external control switch, and bias signals from the unique X-direction and Y-direction DC bias circuits 11 and 12 are output. In this case, since only the vertical direction (Y direction) is a problem with the movement of the displayed image, only the Y direction bias is switched between positive and negative, which makes it possible to automatically perform accurate positioning. can.

Next, with reference to FIG. 7, a case will be described in which the magnification ratio in the scale factor (SF) is switched. Figures 7a to 7c show the expansion rates of scale factors (SF) in order of SF3 → SF2 → SF.
1 and the positioning of each display image 2A ₁ and 2B ₁ and the captured image on the film 3 are displayed. Here, the output from the multiplexer A is adjusted in advance to correspond to the change in the magnification of the scale factor (SF) so that the distance from the center line of the two images projected on the film 3 becomes a→b→c. If you change the bias signal,
Accurate positioning is always possible and the desired photograph can be obtained.

The present invention is not limited to the embodiments described above, and, for example, the control operation of the multiplexer and the timing of the control signal can be changed depending on the application. or,
It can be widely used not only in ultrasound diagnostic equipment but also as a display image capturing device in various devices.

According to the present invention described in detail above, since the position of the displayed image can be automatically positioned at a desired position when photographing an ultrasonic reflection image, the positioning accuracy can be improved and the displayed image shooting can be performed easily. equipment can be provided.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the relationship between the display and the image, Fig. 2 a and b are explanatory diagrams showing the scanning direction of the scanning line, and Figs. 3 a to c are explanatory diagrams showing the relationship between the display and the image. FIG. 4 is a block diagram showing an embodiment of the device of the present invention, and FIG.
The figure is a timing chart to explain its operation.
FIGS. 6 and 7 are explanatory diagrams showing aspects of photographing in the apparatus of the present invention. 1...Display, 2, 2A, 2B, 2A ₁ ,
2B ₁ ... Display image, 3... Film, 4, 5... Multiplexer, 6... Camera, 7... Camera control signal generation circuit, 8... Continuously variable bias means, 9, 10.
11, 12...DC bias generation circuit, 13...Scan switching circuit.

Claims (1)

[Claims] 1. Image display means for displaying sequentially input images; DC bias application means for controlling the display position of the images; and for controlling the DC bias application means for moving the image display position to a predetermined position. an image switch, a freeze memory for storing an image of the inputted moving image as a still image, a freeze switch for operating the freeze memory, and a freeze switch for photographing the still image displayed on the display means. a camera, a camera drive switch for displaying a still image displayed on the display means in connection with photography by the camera at a position symmetrical with respect to the center line of the image display means; a magnification control device for varying the magnification rate of a displayed display image; calculation of a predetermined display position determined according to the magnification rate from the magnification rate control device; and calculation of a DC bias voltage to be applied. A display image photographing apparatus characterized by comprising: a control means for executing and supplying a DC bias to the DC bias applying means.