JPS61199394A - Picture image recorder - Google Patents

Abstract

PURPOSE:To attain the recording of image with high quality free from the lingering of pseudo color or dot-disturbance even when hard-copying a part of a dark saturation by taking the average processing to the image data of neighboring 2-frames and by making the averaged data the image data to be hard-copied. CONSTITUTION:The image signal, after being converted to a digital data by an A/D converter 2, is temporarily stored in the first/second frame memories 3 and 4 respectively as the image data of consecutive two frames. The image data taken out from the said frame memories 3 and 4 is subjected to the processing of averaging operation by an average-processing circuit 5. The data averaged (smoothed) by the circuit 5 is subjected to the correction by edge- emphasis and r-correction at the succeeding correcting circuit 6, thereafter, is demodulated to an analogue image signal by a D/A converter 7. The said signal then is hard-copied by a fiber optical tube. Consequently, dot-disturbances at the hard-copying is prevented from occurring even when copying the part of the dark saturation.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an image recording device, and more particularly to an image recording device that can improve the quality of recorded images.

(Prior art) In recent years, ink-lace type CRT (television screen)
Image recording devices that can directly make a hard copy of images displayed on a computer have come into use.

As shown in Figure 5, the interlaced method first scans the CRT screen with horizontal scans ta (solid line) 1 to 263, and when all odd-numbered horizontal scanning lines have been scanned, the horizontal scanning line (lII line) 263 to 525 are scanned to form one image (frame image) on the CR1 screen. Here, the image formed only by the first scan line (solid line) is an odd field image, and the later scan line (dashed line)
An image formed only by the field is called an even field image.

In the ink-lace method, the screen is constructed by scanning one screen twice, so compared to the rusk-scan method, which sequentially scans from the top to the bottom of the screen, images with less flickering can be obtained, making it suitable for general home use. The ink-lace system is used in television receivers.

Next, consider the case of recording a color image. Among color television signals, in the NTSC system or the Pal system, a color subcarrier is superimposed on the high frequency portion of the luminance signal.

(Problems to be Solved by the Invention) For this reason, so-called dot interference and trailing of false colors occur particularly in highly saturated areas or in areas with vertical stripes. This dot interference occurs when observing images on both screens under the CR.
As the phase of the color subcarrier is reversed, it is visually integrated in the time direction, so it is unlikely to cause interference. However, if you extract only one frame and make a hard copy,
Dot interference caused by the color carrier wave as shown in FIG. 6 was noticeable and the image quality was degraded.

The length of the dot/interference shown in the figure is about 1/285 of the screen horizontal distance.

The present invention has been made in view of these points, and
The purpose is to realize an image recording apparatus that can record high-quality images without causing the aforementioned dot interference or trailing of false colors even when hard copying highly saturated areas.

(Means for Solving the Problems) The first invention for solving the problems described above has at least two
A frame memory capable of storing image data for frames is provided, and after storing two consecutive frames of image data in the frame memory, the average of the image signals of the two frames of image data is calculated. The second invention is characterized in that it is configured to store image data for recording, and the second invention is provided with a frame memory capable of storing at least two frames of image data, and in which the frame memory is continuously stored. After storing the two frames of image data, the line memory stores the image data of the first frame behind these two frames, and the image data of the second frame and the first frame stored in the line memory are stored. The present invention is characterized in that the image data of the image data are extracted in synchronization with each other, and the average of these image data is taken as the image data for recording.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, 1 indicates the color television signal R, G, B
2 is an A/D converter that samples each of the R, G, and B signals at regular intervals and converts them into digital data. A/D converter 2
For example, a high-speed A/D conversion method, such as a successive approximation type A/D converter, is used, and the number of bits is, for example, 8.
Bit Pi! degree is used. Reference numerals 3 and 4 each receive the output data of the A/D converter 2 and store it as image data for one continuous frame, and 5 receives the output of the first and second frame memories 3 and 4. This is an averaging processing circuit that performs averaging processing.

6 is a correction circuit that performs various corrections such as edge enhancement or γ correction on the output image data of the average processing circuit 5; 7 is a D/D converter that converts the output data of the correction circuit 6 back into an analog image signal;
It is an A converter. The output of converter 7 to D7/7 is FOT
The image is recorded by a fiber optic tube (not shown).

The operation of the device configured as described above will be explained as follows.

A color television signal sent from a video camera, etc. is separated into R, G, and B signals by a decoder 1, and then
/ The D converter 2 samples the signals at predetermined time intervals, and converts each color signal into digital data. FIG. 2 is an explanatory diagram of a sampling method for a television screen. Assuming vertical lines as shown in the figure in the vertical direction of a screen in which an effective image is composed of 490 lines, sampling pulses are generated at predetermined intervals in the horizontal direction as shown in the figure with respect to these vertical lines. (1) lli! The image is sampled for 490 lines using the corresponding sampling pulse (1) (the same applies hereafter).

Δ, / [) The image signal converted into digital data by the converter 2 is temporarily stored in the first and second frame memories 3 and 4 as two consecutive frames of image data. The image data taken out from the first and second frame memories 3.4 are subjected to averaging processing in the averaging circuit 5. The image data that has been averaged (smoothed) in the averaging circuit 5 is subjected to corrections such as edge enhancement and γ correction in the subsequent correction circuit 6, and then demodulated into an analog image signal in the D/A converter 7. be done. The demodulated analog image signal is hard-copied by FOT.

According to the present invention, since the average of two consecutive frame images is used as a new image signal, it is possible to suppress the occurrence of dot interference during hard copying even in highly saturated parts.

FIG. 3 is a configuration block diagram showing another embodiment of the present invention. In the figure, 11 is a first A/DI converter that samples the color television signal in the RGB composite state at a constant cycle and converts it into digital data, and 12 and 13 are the output data of the A/D converter 11. A frame memory 14 is a monitor that selectively displays the contents of the first and second frame memories 12 and 13. The monitor 14 is capable of displaying the contents of either frame memory 12 or 13.

15 is a first D/A converter that converts the image data read from the frame memory 12 or frame memory 13 into an analog image signal; 16 is the output (analog image signal) of the D/A converter 15; The decoder 17 that separates the B3 primary color signal is a sample hold circuit that samples each R, G, and B output signal of the decoder 16 in the vertical direction of the screen and holds the sampled image signal for a certain period of time. 18 is a second input 10 for converting the hold signal of the sample and hold circuit 17 into digital data;
It is a converter.

1 is the A/D converter, 18 is a selector that distributes the output data for each frame, 20 is the first line memory that stores the first frame image output from one of the selectors, and 21 is the input of one of the selectors. This is an averaging processing circuit which receives the second frame image from the selector 19 at the first input, and the first frame image stored in the first line memory 2o at the other input, and averages these two frame images. 22 is 1 of the processed data output of the average processing circuit 2'1.
a second line memory for storing frame data, 23;
24 is a correction circuit that performs correction processing such as edge enhancement or γ correction on the output of the line memory 22 of @2; 24 is a second D that demodulates the output of the correction circuit 23 into an analog image signal;
, /A converter. The operation of the device configured as described above will be explained as follows.

The input color television signal is sampled at a high speed of about 14.3MH7, converted to digital data by the first A/D converter 11, and then stored as two consecutive frame images in the first and second frame memories. R,G on 12.13
, 8 composite signals are stored as they are. The composite image signals stored in the first and second frame memories 12 and 13 are read out alternately, converted back to analog image signals by the first 0/Δ converter 15, and then converted into analog image signals by the subsequent decoder 16. , G, are separated into 8 signals. The separated R, G, and B signals are sampled by a sample and hold circuit 17 in the vertical direction of the screen.

The sampled data is sent to the second A/D converter 18
is converted back into digital data. The converted first frame digital data is stored in the first line memory 20 by the selector 19. Then, the averaging processing circuit 21 reads out the first frame image from the first line memory 20 in synchronization with the reading out of the second frame image inputted via the selector 19, and performs an averaging process. As for processing, for example, the image m degrees (or brightness) signal at a certain point in the first frame is multiplied by 1, and the image 1 flil 1 degree (or i degrees) signal at the same point in the second frame is multiplied by
2. The calculation is such that when the average value is multiplied by ×a■, Xav=(X+J-,x2>/2).The averaged frame memory is stored in the line memory 2 of -Whistle 2. Ru.

The subsequent operations of the correction circuit 23 and the D/A converter 24 are the same as in the embodiment shown in FIG. 1, and therefore their explanation will be omitted.

FIG. 4 is a diagram showing the operation of each part of the embodiment shown in FIG. 3 above. Here, operation A in the figure.

The contents of B, /M, and B- are as follows.

A: A, /D converted '@1 frame signal is written to the first line memory 20, while the second line memory 2
2, read out the image data (average of the first frame and second frame) and perform γ correction.

Perform edge enhancement, smoothing, etc., and record the image.

B: Take the average of the A/D converted second frame signal and the contents of the first line memory 20 read out in synchronization with it, and write it into the second line memory 22.

△-: Move the sampling point to the next one, same as △ (1 in 1,000)
Make one work.

B': Move the sampling point to the next location and perform the same operation as B.

As explained in detail above, according to the present invention, two adjacent
By averaging the frame worth of image data and using it as the image data to be hard-copied, high quality is achieved without dot interference or false color trailing even when hard-copying highly saturated areas. It is possible to put into practical use an image recording device capable of recording images of 200 to 3000 ms, which has a great practical effect.

[Brief explanation of the drawing]

FIG. 1 is a configuration block diagram showing one embodiment of the present invention, and FIG.
3 is a block diagram showing another embodiment of the present invention, FIG. 4 is a diagram showing the operation of each part, FIG. 5 is an illustration of the incremental method, and FIG. 6 is an illustration of the sampling method. is an explanatory diagram of dot interference. 1.16...Decoder 2.11.18...A,/D converter 3.4, 12
．． 13... Frame memory 5.21... Average processing circuit 6.23... Correction circuit 7.15.24... D/A converter 17... Sample hold circuit 19... 20.22...Line memory patent applicant Roku Konishi Photo Industry Co., Ltd. Representative Patent attorney Fuji Ijima 1 person Figure 1

Claims (2)

[Claims] (1) A frame memory capable of storing at least two frames of image data is provided, and after storing two consecutive frames of image data in the frame memory,
An image recording apparatus characterized in that the image data for recording is obtained by averaging the image signals of the two frames of image data. (2) A frame memory capable of storing at least two frames of image data is provided, and after storing two consecutive frames of image data in the frame memory,
It has a line memory that stores the image data of the first frame among these two frames, and synchronizes and retrieves the image data of the second frame and the image data of the first frame stored in the line memory, and extracts these image data in synchronization with the image data of the first frame. An image recording device characterized in that it is configured to take an average of data and use it as image data for recording.