JPH0477693A - Image regeneration device - Google Patents

Abstract

PURPOSE:To enable quick image regeneration by outputting transmission signal from a transmitter array and by receiving the reflected signal from an object body. CONSTITUTION:A sine wave transmitting signal S10a is output from a transmitter array 11 within a transmit/receiving part 10. The transmitting signal is reflected by an object body 1 and the reflected signal S10b is received by a receiver array 12. Spatial frequency converted by an analyzer part 30 of spatial frequency is sent to a display part 40. At the display part 40, displaying process is applied to the input spatial frequency to convert into video signal and to display the C mode image thereof on a display.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an image reproducing device such as an audio-visual device, and particularly to an image reproducing device that reproduces an image of a target object existing in water or the like using sound waves or the like. It is necessary.

(Prior art) Conventionally, as a technology in this field, there is a publication in the Journal of the Acoustical Society of Japan 1. Sei 2 [7] (1986) There was something described in Kaiho Hayayo's ``Audio and Visual Using Cross Fan Beam'', pp. 548-555.

As described in this document, a conventional cross-fan beam scanning audiovisual device uses a cross-arrayed transducer array, and uses cross-fan beam scanning to generate a C-mode image (front image) of an underwater target object. A B-mode image (cross-sectional image) is reproduced.

That is, to reproduce a C-mode image, a horizontal fan beam is formed by a vertically arranged transmitter array, and a vertical fan beam is formed by a horizontally arranged receiver array. Then, by combining the two, a pencil beam is formed in the intersecting direction, and by receiving the echo, the reflection intensity in the direction of the pencil beam is determined. By changing the direction of the pencil beam, the reflection intensity at each point of the target object in front is determined, and the C-mode image is reproduced. Roughly speaking, a pulse wave is used for the transmitted signal, and the distance direction is resolved based on the return time of the echo to reproduce the B-mode image.

(Problem to be Solved by the Invention) However, in the apparatus with the above configuration, when reproducing a C mode image, scanning is performed in the vertical direction, so in order to reproduce one image, the number of lines of the image to be reproduced The same number of scans must be performed. Therefore, if an attempt is made to reproduce an image with high precision, there is a problem in that the number of pulse transmissions and receptions increases and the image reproduction time becomes longer. Furthermore, when attempting to reproduce an image of a moving target object, there is a problem in that the target object moves during scanning and cannot be reproduced correctly, and it has been difficult to solve these problems.

The present invention provides an image reproducing device that solves the problems that the prior art had, such as not being able to reproduce an image and not being able to reproduce a moving object without performing multiple transmissions and receptions. It is.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides an image reproducing device that reproduces an image of a target object, which includes a transmitter array that sends a transmission signal toward the target object, and a transmitter array that transmits a transmission signal toward the target object. A receiver array that receives a foul signal from the receiver array is arranged on a plane; a sampling section that samples the signal received by the receiver array; and an output of the sampling section that analyzes the output and converts it into a spatial frequency. A device equipped with a spatial frequency analysis section that performs the above-mentioned spatial frequency analysis section, and a display section that displays the output of the spatial frequency analysis section as an image is commercially available.

(Operation) According to the present invention, since the image reproducing device is configured as described above, the transmitter array outputs a transmission signal, and the receiver array receives a reflected signal from the target object. This received signal is sampled by a sampling section and then converted into a spatial frequency by a spatial frequency analysis section. The converted spatial frequency is displayed in the form of a C-mode image by the display section.

As a result, image reproduction can be performed with one transmission/reception, thereby making it possible to reproduce moving objects. Therefore, the above problem can be solved.

(Embodiment) FIG. 1 is a block diagram of the configuration of an image reproducing apparatus showing an embodiment of the present invention.

This image reproducing device has a function of reproducing a C-mode image of a target object 1, and includes a transmitting/receiving section 10. Transmitting/receiving section 1
In addition to the transmitter array 11 that sends out a transmission signal S10 to the target object 1 and the receiver array 12 that receives the reflected signal 510b from the target object 1, 0 generates a transmission signal, amplifies it, and transmits it to the target object 1. It has a function of supplying signals to the transmitter array 11 and a function of detecting signals received by the receiver array 12 after amplifying them. Transmitter array 1] is composed of one transmitter element. The receiver array 12 is configured by two-dimensionally arranging a plurality of receiver elements, M in the horizontal direction and N in the vertical direction.

The transmitter array 11 and the receiver array 12 are arranged and formed on the same plane or on separate planes.

A sampling section 20 is connected to the receiver array 12 side. The sampling unit 20 has a function of sampling the received signal on the receiver array 12 side and converting it into a digital signal, and has a spatial frequency analysis unit 30 on its output side.
is connected.

The spatial frequency analysis section 30 has a function of analyzing the digitized received signal and converting it into a spatial frequency using a two-dimensional linear prediction method, two-dimensional Fourier transform, etc., and has a display section 40 on its output side. It is connected.

The display unit 40 has a function of performing display processing such as screen integration on spatial frequencies, converting the output into a video signal, and displaying the image on a display such as a CRT.

Next, the operation of the image reproducing apparatus as described above will be explained.

First, the transmitter array 11 in the transmitting/receiving section 10 outputs, for example, a sine wave transmission signal 510a.

This transmission signal 510a is reflected by the target object 1 in front, and the reflected signal 810b is received by the receiver array 12 in the transceiver section 10. The received signal received by the receiver array 12 is amplified and detected, and then sampled and converted into a digital signal by the sampling section 20 and sent to the spatial frequency analysis section 30.

The spatial frequency analysis section 30 converts the digitized received signal into a spatial frequency using, for example, a two-dimensional linear prediction method or a two-dimensional Fourier transform.

Here, when using the two-dimensional linear prediction method, the spatial frequency analysis section 30 calculates the following equation (k), and the spatial frequency F
(θ, ψ) is excluded.

However, θ: horizontal direction ψ; 1 in vertical direction α; linear prediction coefficient horizontal direction frequency fx=f-sinψ・CO3θ vertical direction frequency f, -f-sinψ・sinθf; transmission signal 51
Frequency variance function φ (i, j, o, o) of 0a Covariance function φ (i, j, ni, l) m=q m=p ・3 (n, −, m − l ) N; Reception The number of elements in the vertical direction of the receiver array 12 is M; the number of elements in the horizontal direction of the receiver array 12 is 3 (n, m); the output of the receiver array 12 with n rows and m columns; The frequency analysis unit 30 calculates the following equation (2) and calculates the spatial frequency F
Calculate (θ, ψ).

F (θ, φ) ... (2) However, fx, fy, f, s (n, m>, N, M are (1
) Same content as expression.

The spatial frequency F(θ,
ψ) is sent to the display unit 40. The display unit 40 performs display processing on the input spatial frequency F (θ, ψ), converts it into a video signal, and displays a C-mode image two-dimensionally on the display.

In this way, in this embodiment, the transmitter array 11 and the receiver array 12 are arranged on a plane, and the receiver array 12
After sampling the received signal by the spatial frequency F
(θ, ψ) and reproduces the image J:. Therefore, a C-mode image can be reproduced by one transmission from the transmitter array 1], and not only can image reproduction be performed at high speed, but also image reproduction of a moving target object can be performed with high precision.

Note that the present invention is not limited to the above embodiments, and various modifications are possible. Examples of such modifications include the following.

(a) Transmitter array 11 and receiver array] 2 is,
It is not limited to what is illustrated. For example, transmitter array 11
may be configured with a plurality of transmitter elements, and one transmitter element may be used when reproducing a C-mode image.

(b) Sampling section 20 and spatial frequency analysis section 3
0, etc. may be configured not only by a separate circuit but also by a processor such as a digital signal processor or a microprocessor.

(C) The display unit 40 may be configured with other image display means such as a printer instead of a display.

(d) In the above embodiment, only the reproduction of the C-mode image was explained, but it is also possible to add a function to perform distance direction resolution and reproduce the B-mode image, depending on the return time of the reflected signal 510b. It is.

(e) By using sound waves, radio waves, etc. as the transmission signal 510a, it is possible to reproduce an image of a target object existing in water or in the air.

(Effects of the Invention) As described in detail above, according to the present invention, the transmitter array and the receiver array are arranged on a plane, and after sampling the received signal received by the receiver array, the spatial frequency I am trying to play the image by converting it to . Therefore, a C-mode image can be reproduced by one transmission by the transmitter array, and not only can image reproduction be performed at high speed, but also image reproduction for a moving object can be performed with high accuracy.

[Brief explanation of drawings]

FIG. 1 is an MTC block diagram of an image reproduction device showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Target object, 10... Transmission/reception unit, 1]... Transmitter array, 12... Receiver array, 20... Sampling unit, 30... Spatial frequency analysis unit, 40...・
Display section, 5108...transmission signal, 510b...reflection signal.

Claims (1)

[Claims] A transmitter/receiver unit including a transmitter array that transmits a transmission signal toward a target object and a receiver array that receives reflected signals from the target object are arranged on a plane, and a transmitter/receiver unit that is configured by the receiver array. A sampling unit that samples a received signal, a spatial frequency analysis unit that analyzes the output of the sampling unit and converts it into a spatial frequency, and a display unit that displays the output of the spatial frequency analysis unit as an image. Image playback device.