JPH05316481A - Duplicate video reduction display system for infrared video device - Google Patents

Abstract

PURPOSE:To reduce video duplicate phenomenons at the time of image-picking up a moving object and to improve video quality in the duplicate video reduction display system of an infrared video device. CONSTITUTION:At the time of display, video data obtained in an odd or even field is read from either of a first field memory 200, a second field memory 300 and a third field memory 400 so as to display it on one horizontal scan line. An average between video data and video data obtained in the even or odd field immediately before the data is repetitively obtained in a first arithmetic part 700, or a second arithmetic part 800 or a third arithmetic part 900 so as to display it in a next horizontal scan line by the whole scan lines. Then, a television signal by one display field of 1/2N horizontal scan lines is generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a redundant image reducing display system for an infrared image device. The infrared imaging device detects infrared rays emitted according to the temperature of the object and converts it into a TV image.The temperature distribution of the observed object and the movement of the target object in the dark are displayed in a two-dimensional and moving image on the TV screen. indicate. In this case, there is a demand for an overlap image reduction display method for an infrared image device that can reduce the image overlap phenomenon when capturing a moving object and improve the image quality.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing the configuration of a conventional circuit. FIG. 5 is a diagram showing the relationship between data acquisition and television display in the conventional example.

The infrared image pickup device targeted by the present invention employs the "Japan standard television system" as a video display system. That is, the number of frames per second is 30, and the number of horizontal scanning lines at the time of display is 525. Of these, 480 lines are used as the number of effective scanning lines for video display, and the effective scanning lines are 60 fields per second by 2: 1 interlace. 240 ODD (odd number) and EVEN (even number) fields are alternately displayed.

On the other hand, at the time of image pickup, an infrared ray detector having a plurality of detector elements arranged vertically (in a row) is irradiated with infrared rays from an image pickup scene condensed by a horizontal scanning optical system having a scanning mirror. The analog output photoelectrically converted by the detection element is taken out and AD-converted to obtain digital video data.
In this case, one sensing element will acquire image data for one horizontal scanning line.

However, the detector cannot unnecessarily increase the number of elements due to the limitation of the degree of integration of elements and the sensitivity. Therefore, in order to compensate for the gap between the detection elements and improve the resolution, a 2: 1 interlaced scanning method is used for imaging, and one detection element acquires image data for two horizontal scanning lines. That is, in the case of a detector having 120 detectors, the number of effective data lines in the horizontal direction when acquiring image data is 240.

Conventionally, an output signal of an infrared detector is converted into digital video data by an analog / digital converter (hereinafter referred to as A / D) 1 shown in FIG. And
For example, the field period of ODD _n (0 to 1 /
Image data (O ₁ , O ₂ , O ₃ , ..., O ₁₂₀ ) corresponding to 120 horizontal scanning lines acquired in 60 seconds) is stored in, for example, the field memory 2. Next, the EVEN shown in FIG.
Acquired in _n field periods (1/60 second to 2/60 second)
Video data corresponding to 120 horizontal scanning lines (E ₁ ,
E ₂ , E ₃ , ..., E ₁₂₀ ) are stored in the field memory 3.

Then, the next timing (2/60 seconds to 3/60)
Second), the video data stored in the field memories 2 and 3 are alternately selected by the selector 5 to read one horizontal scanning line at a time, and a digital / analog converter (hereinafter referred to as D / A) 6 is used to display analog video. Convert it to a signal,
A signal for one display field of a total of 240 horizontal scanning lines is displayed on a television screen (not shown) as shown by (1) in FIG.

At the same time, the video corresponding to 120 horizontal scanning lines acquired in the field period of ODD _{n + 1} shown in FIG. 5 at the same timing (2/60 seconds to 3/60 seconds) as the above-mentioned television display timing. Data (O ₁ , O ₂ , O ₃ , ...
, O ₁₂₀ ) in the field memory 4. Then, at the next timing (3/60 seconds to 4/60 seconds), the video data stored in the field memories 3 and 4 is selected by the selector 5
Alternately select to read one horizontal scanning line at a time, and
A / A6 converts it into an analog video signal and displays it as a signal for one display field of a total of 240 horizontal scanning lines on a television screen (not shown) as shown in (2) in FIG. The above-mentioned (1) and (2) in FIG. 5 make up one frame on the television screen.

Also, at the same timing (3/60 seconds to 4/60 seconds) as the above-mentioned television display timing, EVEN _{n + 1.}
The image data (E ₁ , E ₂ , E ₃ , ..., E ₁₂₀ ) corresponding to the 120 horizontal scanning lines acquired during the field period is stored in the field memory 2.

Hereinafter, the video data of the ODD field and the EVEN field are alternately acquired and sequentially written in the respective field memories 3, 4 and 2, and all the data acquired in both fields of adjacent timings are within the next display field period. Double the number of horizontal scanning lines by reading
The display was made on two horizontal scanning lines adjacent to each other on the TV screen.

[0011]

However, in the above-mentioned method, video data (ODD data and EVEN data) acquired at different times (1/60 second difference) are simultaneously displayed on the TV screen (within the same display field period). Since the image is displayed, there is a problem that a horizontal shift (image duplication phenomenon) occurs in the image and the image quality is deteriorated particularly when capturing a fast-moving scene such as a high-speed moving object.

Therefore, it is an object of the present invention to provide a duplicated image reduction display system of an infrared imager capable of reducing the image duplication phenomenon when capturing a moving object and improving the image quality.

[0013]

The above problems can be solved by the structure of the apparatus shown in FIG. That is, referring to FIG. 1, image data for N horizontal scanning lines are acquired during the ODD and EVEN field periods of 2: 1 interlace at the time of image capturing to obtain the first, second and third field memories 200, 3 respectively.
00, 400 are sequentially stored, and the first, second and third are displayed at the time of display.
The video data stored in the field memories 200, 300, and 400 of the
In the overlapping image reduction display method of the infrared imaging device for displaying in the display field of a book, 700 is a first image reading device that reads out the image data stored in the first and second field memories 200 and 300 and outputs the average of the two. It is a calculation unit.

800 is a second and third field memory 30
The second arithmetic unit reads out the video data stored in 0, 400, calculates the average of both, and outputs the average. Reference numeral 900 denotes a third arithmetic unit that reads out the video data stored in the third and first field memories (400, 200), obtains the average of both, and outputs the average.

The above 700, 800 and 900 are newly provided. At the time of display, the video data acquired from the first, second or third field memory 200, 300, 400 during the field period of ODD or EVEN is read and displayed on one horizontal scanning line, and the next horizontal scanning line is displayed. For the scanning line, the average of the video data and the video data acquired during the EVEN or ODD field period immediately before the video data is calculated by the first arithmetic unit 700, the second arithmetic unit 800, or the third arithmetic unit 900. The display is repeated for all scanning lines to generate a television signal for one display field of 2N horizontal scanning lines.

[0016]

In FIG. 1, for example, N image data of horizontal scanning lines are acquired and stored in the first field memory 200 during the field period of ODD at the time of image pickup, and then, during the field period of EVEN. The video data for this line is acquired and stored in the second field memory 300.

Then, at the timing of the next field period, the video data acquired in the field period of the latest EVEN is selected by, for example, the selection unit, and the second field memory is selected.
One horizontal scanning line is read out from 300 and displayed on one horizontal scanning line. Next, one scanning line portion of each of the video data acquired in the field period of this EVEN and the video data acquired in the field period of the ODD immediately before this video data is selected by the selection unit, and the second field memory 300, 1
Read out from the field memory 200, the average is obtained by the first arithmetic unit 700, and displayed on the next horizontal scanning line. This is repeated for all the scanning lines, and 1 of 2N horizontal scanning lines
Display TV signals for the display field.

As a result, by averaging the field data at different times and displaying it on one of the two scanning lines of the television, the difference between the two field data having different acquisition times is reduced. Therefore, it is possible to reduce the image overlapping phenomenon (horizontal shift) when capturing a moving object. Then, it becomes possible to improve the image quality.

[0019]

FIG. 2 is a block diagram showing a circuit configuration of an embodiment of the present invention. FIG. 3 is a diagram showing a relationship between data acquisition and television display in the embodiment.

The same reference numerals denote the same objects throughout the drawings. The present invention adds an arithmetic unit to the circuit of the conventional example shown in FIG. 4 so that two types of video data output from two field memories in a read state are averaged by the arithmetic unit and data not. The video data is divided and selected by a selector, and the selected video data is D / A converted and then displayed on the television screen. This will be described in detail below.

The output signal of the infrared detector is shown by A / in FIG.
It is converted to digital video data at D1. And an example
For example, the ODD shown in FIG._nField period (0-1 / 60
Video data corresponding to 120 horizontal scanning lines acquired in
(O₁, O₂, O₃, ... O₁₂₀) (This data string
Is stored in the field memory 2.
Next, the EVEN shown in FIG._nField period (1/60
It corresponds to 120 horizontal scanning lines acquired from 1 second to 2/60 seconds).
Video data (E₁, E₂, E₃, ..., E ₁₂₀) (This
Data string of (for example) to the field memory 3
Remember.

Then, the next timing (2/60 seconds to 3/60)
Second), the video data (and) stored in the field memories 2 and 3 are simultaneously read out, and the video data of the field of EVEN _n are directly input to the selector 5 ′, while the arithmetic unit 7 averages these data. ((+) /
2) is obtained and input to the selector 5 '. Then, the averaged data and the video data (E ₁ , E ₂ , E ₃ , ..., E ₁₂₀ ) of the field of EVEN _n are alternately selected by the selector 5 ′ for each scanning line, and the D / A 6 is selected. After being converted into an analog video signal by, the signal is displayed on a television screen (not shown) as a signal for one display field of a total of 240 horizontal scanning lines as shown by (1) in FIG. In the same figure, the shaded area shows the averaged data.

Next, at the same timing (2/60 seconds to 3/60 seconds) as the above-mentioned television display timing, 120 horizontal scanning lines acquired in the field period of ODD _{n + 1} shown in FIG. 3 are corresponded. Video data (O ₁ , O ₂ , O ₃ , ...
, O ₁₂₀ ) (this data string is, for example) is stored in the field memory 4. And the next timing (3 /
60 seconds to 4/60 seconds), these field memories 3 and 4
The video data (and) stored in
While the video data of the field of ODD _{n + 1} is directly input to the selector 5 ′, the arithmetic unit 8 calculates the average ((+) / 2) of these data.

Then, the video data (O ₁ , O ₂ , O ₃ , ..., O ₁₂₀ ) of the field of ODD _{n + 1} and the averaged data are alternately selected for each scanning line by the selector 5 '. Then, after converting to an analog video signal with D / A6, 1 of 240 horizontal scanning lines is displayed on the TV screen (not shown).
The signal for the display field is displayed as shown by (2) in FIG. 3, and the hatched portion in the figure shows the averaged data. One frame on the TV screen is shown in (1) and (2) of FIG. 3 described above.

Further, the same timing as the above-mentioned TV display timing is used.
At the same timing (3/60 seconds to 4/60 seconds), EVEN_{n + 1}
Video data acquired during field period (not shown)
(E ₁, E₂, E₃, ..., E₁₂₀) Field memo
Remember in Ri 2.

Hereinafter, the video data of the ODD field and the EVEN field are alternately acquired and sequentially written in the respective field memories 3, 4 and 2, and the data acquired in both fields at adjacent timings in each arithmetic unit are read out and averaged. Then, averaged data and non-averaged data are alternately selected and displayed on two adjacent horizontal scanning lines on the television screen in the next display field period.

As a result, it is possible to alleviate the difference between the two field data having different acquisition times, and to reduce the overlapping image phenomenon (horizontal shift). Then, it becomes possible to improve the image quality.

[0028]

As described above, according to the present invention, it is possible to reduce the image overlapping phenomenon when capturing a moving object, and it is possible to improve the image quality.

[Brief description of drawings]

FIG. 1 is a principle diagram of the present invention,

FIG. 2 is a block diagram showing a circuit configuration of an embodiment of the present invention,

FIG. 3 is a diagram showing a relationship between data acquisition and television display in the embodiment,

FIG. 4 is a block diagram showing a circuit configuration of a conventional example,

FIG. 5 is a diagram showing a relationship between data acquisition and television display in a conventional example.

[Explanation of symbols]

200 is the first field memory, 300 is the second field memory, 400 is the third field memory, and 700 is the first field memory.
, 800 is a second arithmetic unit, and 900 is a third arithmetic unit.

Claims (1)

[Claims] 1. The first, second, and third field memories (200, 300, 300, 300) are obtained by acquiring video data of N horizontal scanning lines in a field period of 2: 1 interlace ODD and EVEN during image pickup, respectively. 400) and sequentially stores the first, second and third field memories (200, 300, 40) at the time of display.
In the redundant image reduction display system of the infrared imaging device for reading the video data stored in (0) and displaying it in a display field of 2N horizontal scanning lines of 2: 1 interlace, the first and second field memories (200, The first arithmetic unit (700) that reads out the video data stored in (300) and obtains the average of both, and outputs the video data stored in the second and third field memories (300, 400). A second arithmetic unit (800) for obtaining and outputting the average of both, and a third calculating unit (800) for reading out the video data stored in the third and first field memories (400, 200) and obtaining and outputting the average of both. And an arithmetic unit (900) for displaying the ODD or EV from one of the first, second or third field memories (200, 300, 400) on one horizontal scanning line during display.
The video data acquired during the EN field period is read and displayed, and the average of the video data and the video data acquired during the EVEN or ODD field period immediately before the video data is displayed on the next horizontal scanning line as the first horizontal line. The calculation and display by the first calculation unit (700), the second calculation unit (800), or the third calculation unit (900) is repeated for all the scanning lines, and 1 of 2N horizontal scanning lines is displayed.
A redundant image reduction display method for an infrared image device characterized in that it is configured to generate television signals for display fields.