JPS61240789A - Image processor - Google Patents

Abstract

PURPOSE:To obtain a traverse, broad angle of visibility for on vehicle device in the rear, facilitate confirmation operation through a vertical broad angle of visibility by reproducing initial images after performing a field angle conversion processing of data which are read from a storage circuit. CONSTITUTION:n/2 Of n pieces scanning lines consisting of auge of view image which is at an aspect ratio 3:4 serve as gates and their outputs are stored as digital signals in storage circuits 3 and 4 by a A/D conversion circuit 2 and then storage contents are read at next field. Being converted into the n pieces scanning lines after performing an image conversion process by an arithmetic circuit 5, the n pieces of scanning line images are reproduced on an image monitor. Likewise, by performing such procedure each field, reproduced images delayed by one field for inputted images are obtained. Furthermore, lateral camera produced images provided separately are simultaneously reproducible through two image planes forming processor on the image monitor at a ratio of m1:2m2 by arranging sideways two image planes of lateral two images which have the aspect ratio such as m1:m2 of an initial field angle.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image processing device, particularly an image processing device suitable for use as a vehicle-mounted video system.

BACKGROUND OF THE INVENTION Currently, an in-vehicle surveillance camera is attached to the back of a large bus, etc., and when the vehicle is reversing, a background image is reproduced on a 3:4 aspect ratio monitor for monitoring and confirmation.

Problems to be Solved by the Invention However, in an image with an aspect ratio of 3:4 as shown in and below, the sky portion is reproduced as much as the required cth as a vertical scene. This part is for driving confirmation.

Since it is not a very important part of the scene, it is difficult to perform confirmation work.

Therefore, the present invention can be installed in a vehicle, for example, to easily check for following vehicles using a wide viewing angle in the lateral direction when reversing. When turning left or right, you can easily perform confirmation work due to the heavy viewing angle downwards.
It is also an object of the present invention to provide an image processing device that is more economical.

Means for Solving the Problems The technical means of the present invention for solving the above problems is to extract a part of the field of view image composed of n scanning lines and perform analog-to-digital conversion. an analog-to-digital conversion means for performing this, a storage means for storing this digital signal, and an angle-of-view conversion processing means for reading out the stored data to form the original n-scanning line image;
The device is equipped with a view angle monitor for reproducing and displaying the image converted by this view angle conversion processing means, and another technical means of the present invention is a vertical and horizontal screen composed of n scanning lines. Ratio m
,: an analog-to-digital conversion means for extracting a part of the m2 field-of-view image and performing analog-to-digital conversion;
A storage means for storing this digital signal, an image view angle conversion processing means for reading out this stored data and configuring the original n scanning line image, and an aspect ratio m,: m2.
a two-screen processing means for arranging the view angle images on two screens; a switching means for switching between the view angle conversion processing means and the two-screen processing means; and an image processed by each of the above-mentioned processing means. Aspect ratio m: 2m for selectively playing back and displaying
It is equipped with a two-angle monitor.

Effect of the present invention is to gate 21 of n scanning lines constituting an image with an aspect ratio of 3:4 using the following structure, digitize the signal by an analog-to-digital conversion means, and then store it once in a storage means. let After that, in the first field, it is read out and converted into n scanning lines by one view angle conversion processing means, and n
It is reproduced on the viewing angle monitor as the main scanned image. By doing this for each field, the reproduced image will be delayed by one field image with respect to the input image, but the angle of view is suitable for in-vehicle use.
Moreover, it can be used as a real-time image. In addition, by processing the reproduced images of the left and right cameras, which are installed separately, into two screens, the vertical and horizontal specific gravity: m2 The left and right images are horizontally displayed with the same angle of view as m2.
Screen side by side I! 11: It can be played back simultaneously on a 2m2 monitor, and can be used to perform appropriate confirmation work when turning left or right while the vehicle is in motion.

Example EMBODIMENT OF THE INVENTION Below, one embodiment of the present invention will be described in detail based on the drawings.

First, a case will be described in which an in-vehicle video system is used to check the rear of a vehicle body.

Figure 1 is a block circuit diagram, Figure 2 is a line scan signal with a 3:4 angle of view, gates the % line scanning signal, and the image processing in Figure 1 is performed to
FIG. 4 is an explanatory diagram of scanning for converting to =8 angle of view. In FIG. 1, numeral 1 denotes a television camera input signal terminal with 625 lines of scanning with a 3:4 angle of view, and 2 denotes an analog-to-digital (M/D) converter, which outputs a digitized signal. 3 is a first odd field image memory circuit, 4 is a second even field image memory circuit, 5 is an arithmetic unit for generating scanning lines to be inserted between original scanning lines, and 6 is a digital-analog CD.
/m) converter, 7 is a signal output terminal with an aspect ratio of 3:8 angle of view,
8 is a synchronization separation circuit for extracting a synchronization signal portion from the input signal terminal 1, 9 is a clock signal generation circuit, and 10.11 is a first and second memory address control circuit.

Next, the order of image reproduction processing will be explained. Input terminal 1
When a television camera signal of 525 scans with an aspect ratio of 3 and a field of view of 4 is inputted, this signal is converted by the MU/D converter 2 into an 8-bit digitized signal. Here, the synchronization separation circuit 8 extracts the synchronization signal part from the input signal, and
D, outputs HD signal. The I(D signal is applied to the clock generation signal circuit 9 for driving pixel signals of each scanning line, and its output is applied to the address control circuit 10.11 as well as the M/D converter 2.
．． It is also added to the D/MU converter 6. The output signal of the synchronous separation circuit 8 is input to the address control circuit 1°, and the output signal is applied to the first and second memory circuits 3 and 4. First of all, by this.

The final scanning line applied to the first field of the input image data from the D/D converter 2 (the solid line scanning line group shown in the input image diagram of 526 scanning lines with an aspect ratio of 3:4 angle of view in Fig. 2a) minute is second
The data is stored in the first memory circuit 3 as shown in the figure. Next, the % scanning line segment in the second field (the group of dotted scanning lines shown in FIG. 2a) is stored in the second memory circuit 4. on the other hand.

During the entire period of this second field, the first memory circuit 3
The stored data are sequentially read out, and data is interpolated between the scan line data read out through the arithmetic circuit 5 and the sum of the previous and succeeding scan line data through the arithmetic circuit 5. /mu converter 6. Through this arithmetic operation, it is possible to process the line scanning image signal to the same line scanning image signal as the original 526 line scanning.

Next, the third field (solid scanning line group shown in Figure 2) i
/c, the same signal processing as in the first field is performed. Also, during this time, the data in the second memory circuit 4 is read out and subjected to signal processing in the same manner as described above.

By repeating the above steps, an input image with an aspect ratio of 3:4 becomes an output image with an aspect ratio of 3:8 as shown in FIG. Ru. That is, the frame image shown in FIG. 2a is input with the number of frame scanning lines n==528, of which n
/2 = 525/2 lines are sequentially stored in the first and second memory circuits 3 and 4 shown in Fig. 1 for each field, and further arithmetic operations convert the 7n lines into n = 525 lines, horizontally and vertically. It is output as a 525 scanned image with a 3:8 field angle ratio, and this output signal is reproduced on a television monitor with an aspect ratio of 328 field angles.

Next, an embodiment will be described in which processing is performed on two-screen confirmation images necessary for left and right turns. FIG. 3 is an explanatory diagram of composite image reproduction, and FIG. 4 is a signal processing system diagram for reproducing the composite image.

In FIG. 3, 21 is a large image, and 22 is 8 images.

23 is the scanning line of the image 21, the first scanning line 1' to 2'
, 3', etc. 24 is a scanning line of 8 images.

The first scanning lines 1', 2', 3', and so on continue.

26 is a composite screen, and 26 is a scanning line of the composite screen, which continues from the first scanning line 1#' to 2///, 3///, and so on. 26, the left half of the scanning line is a reproduction scanning period for the large image 21, and the right half is a reproduction scanning period for the B image 22.

In FIG. 4, reference numeral 27 indicates the first . Third...
...; 28 is a first line memory circuit for storing odd-numbered scanning line data of the large image 21; 29 is an even-numbered scanning line data input terminal of the MU image 21; 3o is the MU image. a second line memory circuit for storing 21 even-numbered scan line data;

31 is the first image of the B image 22. 32 is an even numbered scanning line data input terminal of the B image 22; 33 is a first line memory circuit for storing odd numbered scanning line data of the B image 22; 34; is B image 22
A second line memory circuit for storing even-numbered scanning line data, 35 to 3A are adder circuits, and 38 is a composite image signal output terminal.

It is assumed that the 3:4 aspect ratio field-angle images 21 and 22 of M and B shown in FIG. 3 are all composed of scanning line image signals generated by a Japanese standard television camera. Mu image 21
starts from the first scanning line 1', 2', 3', etc.
...and sequentially scan in even or odd fields,
Approximately 52,572 lines constitute one screen. Similarly, B image 22
Starting from the first scanning line 1', 2', 3', etc.
... and scan sequentially. In this case, the single person image 21 and the B image 22 are sequentially scanned using the same synchronizing signal pulse. It is assumed that both screens maintain synchronization.

Next, as shown on the right side of FIG.
This will be explained using figures. The two-screen processing means shown in FIG. 4 is used by switching between the viewing angle conversion processing means shown in FIG. 1 and a switching means such as a switch.
First and second line memory circuits 28, 30, 33, and 34 are provided corresponding to each image 21, 22, and storage and reading are performed alternately.
Generate screen scanning signals.

That is, the line scanning signals of each of the M and B images 21 and 22 from the television camera are individually converted into uniform digital signals by a M/D converter and then input to the circuit shown in FIG. First, the first scanning line 1' of the MU image 21 of FIG. 3 is converted into an 8-bit digital signal by a MU/D converter, and this is used as the MU signal of FIG. This is input to the digitization input terminal 27 of the odd-numbered scan signal of the screen 21, and is stored for each pixel in the first line memory circuit 28 during the period from the beginning to the end of the first scan. The first B image 22 is synchronized with the B image 21.
The scanning line 1' is also input as a digitized signal B to the input terminal 31 of FIG. 4, and is stored in the first line memory circuit 33 by the end of the first scanning. Next is the person, B image 21.
22 enters the second scanning period. At this time, the second scanning line signal 21 of the demo image 21 and the second scanning line signal 2' of the B image 22 are input to the second line memory circuit 3o via the input terminal 29 for the 8-bit demo image 21, and Input terminal 32 for image 22
is stored in the second line memory circuit 34 for each pixel. On the other hand, during the second scanning period in which the digital ratio signals M2 and 82 are stored in the respective second line memory circuits 3o and 34', the line scan digitized signals are transferred from the first line memory circuit 28 corresponding to the M image 21 to the second line memory circuits 3o and 34'. The line scanning digitized signal from the first line memory circuit 33 of the B image 22 is read out in the first half of the scanning period, and in the second half. Thereafter, the two digitized signals are outputted from a terminal 38 through adder circuits 35 and 37. After this output signal undergoes uniform/mu conversion, it becomes a scanning line image signal 26 of a composite screen 26 with an aspect ratio of 3:8 image reproduction shown on the right side of FIG. 3, and corresponds to the first scanning line 1l. The scanning line 26 is 15. Scanning is performed at a cycle of γ5 KHz, and the read clock frequency from the fin memory circuit is twice the clock frequency during storage, or the data is read out intermittently from the line memory circuit, so that two screens are lined up in one scanning period. Play it like this. The third scanning signals of the TV camera frame image 21 and B image 22 are then digitized signals and stored in the first line memory circuit 28.33. At the same time, the data of the second line memory circuit 30 is sequentially read out from the second line memory circuit 30, 34 in the first half of one scanning period, and the data of the second line memory circuit 34 is read out in the second half, and the adder circuits 36, 37
With the diameter of terminal 38, more outputs are produced. After this output signal is converted once per person, it becomes a two-screen image signal corresponding to the second scanning line 2'' of the composite screen 25 in FIG. One image is reproduced. In this case, it is necessary to use a dedicated monitor with an aspect ratio of 3:8 angle of view.

Effects of the Invention As is clear from the following description, if an image whose angle of view has been converted by the image processing apparatus of the present invention is used in an in-vehicle video system, the following effects can be obtained.

(1) The 3:8 aspect ratio conversion provides a wide viewing angle in the left and right directions behind the vehicle, making confirmation work easier.

(2) The left and right sides of the car body are checked from the images installed with cameras on both sides of the car body, so the aspect ratio for both left and right sides remains 3:4.
It has been converted into a screen and can be viewed on a monitor with a 3:8 aspect ratio to distinguish between left and right sides.

(3) The conventional television signal synchronization system can be used without changing, and the conventional 3:4 aspect ratio television camera can still be used as is, which is economical.

(4) Even if the conventional 3:4 aspect ratio image is maintained, the aspect ratio is still 3:4.
Can be played on either the left or right side of an 8-angle monitor.

[Brief explanation of the drawing]

The first section is a block circuit diagram showing one embodiment of the image processing device of the present invention, FIG. 2 is an explanatory diagram of a view angle image obtained by processing by the circuit of FIG. Image reproduction explanatory diagram, FIG. 4 is a signal processing system diagram for reproducing a composite image. 1...Input terminal, 2...A/D converter, 3...First odd field signal memory circuit, 4...Second even number Field signal memory circuit, 6... Arithmetic unit, 6... D/MU converter, 7... Signal output terminal. 8... Synchronization separation circuit, 9... Clock signal generation circuit, 1o... First address control circuit, 11... Second address control circuit , 27・
...Input terminal. 28...First line memory circuit, 29...
...Input terminal, 30...Second line memory circuit, 31...Input terminal, 32...Input terminal, 33...First line memory circuit , 34...
...Second line memory circuit, 35.36.37...
...Addition circuit, 38...Output terminal. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure 4

Claims (4)

[Claims] (1) Analog-to-digital conversion means for extracting a part of an angle-of-view image composed of n scanning lines and performing analog-to-digital conversion; storage means for storing this digital signal; and storage means for storing this digital signal; an image view angle conversion processing means for reading out the original n scanning line image and composing the original n scanning line image;
An image processing device comprising a view angle monitor that reproduces and displays the image converted by the view angle conversion processing means. (2) An image according to claim 1, wherein the image view angle conversion processing means reads the stored data, inserts scanning line data so that the image has a density gradient between the original scanning lines, and performs signal processing. Processing equipment. (3) Extract 1/2n scans from an angle-of-view image with an aspect ratio m_1:m_2 composed of n scanning lines, and convert it to m_1:2m_2 angle of view with n scans by a view-angle conversion processing means, The image processing apparatus according to claim 2, which reproduces and displays the image on a m_1:2m_2 view angle monitor. (4) an analog-to-digital conversion means for extracting a part of an angle-of-view image with an aspect ratio m_1:m_2 composed of n scanning lines and performing analog-to-digital conversion; and a storage means for storing this digital signal; An image angle of view conversion processing means for reading out the stored data and configuring the original n scanning line image, and a two-screen processing for arranging the angle of view images with an aspect ratio of m_1:m_2 on two screens. means, switching means for switching between the viewing angle conversion processing means and the dual screen processing means, and a viewing angle monitor with an aspect ratio of m_1:2m_2 for selectively reproducing and displaying images processed by the respective processing means. An image processing device characterized by: