JPS61196685A - Picture recorder - Google Patents

Abstract

PURPOSE:To perform the picture recording without deviation even on the screen having movement without losing the picture information, by providing a means to detect the movement of a picture and performing a smoothing processing in case there is a movement in the picture, in a picture recorder having an interlace system. CONSTITUTION:In a smoothing circuit, density signals Xi+1, Xi on the same perpendicular against the adjacent scanning lines are outputted from latches 11-13, respectively. Subtractors 14, 15 and adders 16, 17 operate the difference and the sum of the adjacent concentration signals, respectively. Comparators 19 and 20 compares inputs with a constant A, respectively. On the one hand, an adder 22 operates (Xi+1+2Xi+Xi-1), and a divider 23 operates (Xi+1+2Xi+ Xi-1)/4. A signal X1 and the output of the divider 23 are inputted into a selector 24. Then, a gate 21, when Xi+1-Xi>A and Xi-1-Xi>A are satisfied, selects the output of the divider 23, and when this inequality is not satisfied, a selection signal to select a signal Xi is given to the selector 24. Thus, the selector outputs a picture data processed with smoothing against the picture having the move ment, and outputs the original picture Xi against a still picture as it is.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an image recording device that can directly make a hard copy of an image displayed on an ink-lace CRT. However, the present invention relates to an image recording device that can hard copy images without blurring.

(Prior Art) In recent years, image recording devices that can directly make a hard copy of images displayed on an interlaced CRT (television screen) have come into use. Here, the increment method is as shown in Fig. 7, where the CRT screen is first scanned with horizontal scanning lines numbered 1 to 263 (solid lines), and when all numbered horizontal scanning lines have been scanned,
This time, horizontal scanning lines (broken lines) numbered 263 to 525 are scanned to form one image (frame image) on the CRT screen. Here, an image formed only by scanning lines 1 to 263 or -525 to 263 is called an odd field image and an even field image, respectively.

In the interlaced method, the same part is scanned twice, so
Compared to the Rusk Scan method, which scans sequentially from the top to the bottom of the screen, images with less flicker can be obtained.
- Blurred image reception for installation I (the interlaced method is adopted).

(Problems to be Solved by the Invention) As described above, the interlaced method is an excellent method without displaying images, but a problem arises when a television screen is directly copied as a hard copy. In other words, when you try to hard copy a moving screen, there is a time difference between odd and even fields, so the copied image contains parts where the odd and even field images do not overlap. There was a problem in which the parts appeared in a comb-like shape, resulting in a comb-like blurred image.

Various methods have been considered to solve such problems. For example, field recording (recording using either odd field or even field data) is performed for moving parts, and frame recording is performed by combining odd field images and even field images for stationary both sides without movement. It has been done. However, even if it is possible to reliably distinguish between moving parts and non-moving parts under the field selection method with IT, in the case of field recording, the information for field recording is inevitably compared to the case of frame recording. As a result, accurate judgment cannot be made when performing image diagnosis using the copy image.

Generally, it is difficult to distinguish between moving parts and non-moving parts, and erroneous discrimination is likely to occur.If erroneous discrimination occurs, field recording will occur even though the screen is motionless. When field recording is performed, detailed information is lost as described above.

FIG. 8 is a diagram illustrating an example of recording when conditional judgment is made for even fields, with solid lines representing even fields and broken lines representing odd fields. That is, when a human image as shown in (a) is recorded, eyebrows, eyes, mouth, etc. disappear as shown in (b).

The present invention has been made in view of these points, and
The purpose is to realize an image recording apparatus that can record images without losing image information and without blur even on a moving screen.

(Means for Solving the Problems) A first invention for solving the above-mentioned problems is a detection method for detecting movement of images in an image recording apparatus that records images based on interlaced image signals. equipped with the means;
The second invention is an image recording method that records an image based on an interlaced image signal. In the device, adjacent scanning lines /f-
++/! +I! Assuming that the image signals of the pixels at the vertical position of f''+ are offset X +-1, 'X i, X i+t, these image signals are expressed as
1, and based on the comparison results, movement of the image is detected, and if there is movement in the image, smoothing processing is performed.

(Operating Principle) Before describing embodiments of the present invention, the principle of the present invention will be explained. The operating principle of the present invention is to output a smoothed image when there is movement in the image, and to output the original image when there is no movement. By performing such processing, it is possible to record a moving image without blur. A method for detecting moving images will be described below. Now, each scanning line of the television signal is represented as shown in FIG. In the figure, solid lines are odd scanning lines and broken lines are even scanning lines (or vice versa). Each of these scan lines is decoded into R, G, B
(red, green, blue) signals shall be obtained. Now, the density signal at the position of that - color is ×1, and the density signal of the scanning line above and below it is X i-t * X l"+
shall be. These three concentration signals X i-t + X i
* A new concentration signal X is generated for X''r using the following algorithm.

Xi"z Xi>A month×i-1-Xi >A or Xi+t Xi<A and Xt-t -Xi <-
When A (A is O or a constant close to O), let Xi be
/4 is replaced with a new concentration signal.

On the other hand, if the conditions shown in equations (1) and (2) are not satisfied, equation (3) is not applied and Xi is directly used as the density signal.

Top 5. When density conversion processing is performed according to an algorithm such as I, equation (3) is applied to an image with movement (an image with comb-like portions) as shown in FIG.
3) The ×1 part is replaced with the am signal X shown by the formula,
Smoothing is performed.

That is, as a result of smoothing, comb-like portions do not appear in the hard copy. On the other hand, for an edge image as shown in FIG. 12, for example, <1).

Since the condition ft shown in equation (2) is not satisfied, the image is directly copied as a hard copy. In this case, smoothing is not performed, so the edges will not be dulled.According to the present invention, in the case of an image with thin white horizontal lines on a black background, or an image with black horizontal lines on a white background, smoothing is performed even if it is a still image. However, the information will not be lost. For example, in an extreme example, )]-1=O, Xi =1. When Xi++ = O, X = 0.5 from equation (3), and the signal will not be completely lost. Furthermore, in the example of the human face in the previous book, although the resolution is reduced as a result of smoothing, as shown in FIG. 9, eyebrows, eyes, mouth, etc. are not lost at all.

(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 is a decoder that receives an ink-lace video signal and separates it into signals of three primary colors (R, G, B), and 2 is a decoder that separates the R, G, and B signals separated by the decoder 1.
A sample-and-hold circuit samples a video signal in the vertical direction of the screen and holds the sampled video signal for a certain period of time, and 3 is an A/D converter that converts the hold output of the sample-and-hold circuit 2 into digital data. As the A/D converter 3, a high-speed Δ/D conversion type A/D converter, for example, a successive approximation type A/D converter is used.

The number of bits used is, for example, about 8 bits.

4 is a line memory that stores the output of the A/D converter; 5 is a smoothing circuit that extracts the igl signal stored in the line memory 4 as image data and performs image smoothing processing using the algorithm described above; 6 is a signal processing circuit that performs gradation processing such as gamma conversion on the output of the smoothing circuit 5, and 7 is a D/A converter that converts the output of the signal processing circuit 6 back into an analog image signal. The D/
The output of A converter 7 is FOT (fiber optical
The image is recorded by a tube (not shown). The operation of the device constructed in this way will be explained as follows.

An interlaced video signal sent from a video camera or the like is separated into R, G, and B signals by a decoder 1, and then input into a sample bold circuit 2 for each of the three primary color signals. FIG. 2 is a diagram showing an example of an input television signal waveform. An image signal is captured during the first frame period, and image recording is performed during the next frame period. Note that the vertical synchronization signal Vsync is generated for each field. The sample and hold circuit 2 samples the input video signal at regular intervals. FIG. 3 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 the screen, sampling pulses are generated at predetermined intervals in the horizontal direction as shown in the figure with respect to these vertical lines.

The vertical line image (1) is sampled with the corresponding sampling pulse <1) (the same applies hereafter). The sampled and held video signal is converted into digital data by an A/D converter 3.

These digital data are stored in the line memory 4 in the arrangement shown in FIG. 4, for example.

That is, first, odd-numbered image signals are sampled in odd-numbered fields, A/D converted to digital image data, and stored in line memory.Next, the same processing is performed on even-numbered fields and stored in line memory. . As a result, the relationship between the address of the line memory 4 and the scanning line data number is as shown in FIG. The image data for one frame stored in the line memory 4 in this manner is sequentially extracted in the next frame and sent to the smoothing circuit 5.

FIG. 5 is a diagram showing a specific configuration example of the smoothing circuit 5. As shown in FIG. In the figure, reference numeral 11 denotes a first latching unit that latches image data read out from the line memory 4 according to the readout clock.
12 is a second latch that latches the output of the first latch 11, and 13 is a third latch that latches the output of the second latch 12. 14 is the first latch 11
15 is a second subtracter that subtracts the output of the third latch 13 from the output of the second latch 12; an adder 17 (J for adding the output of the second latch 12 and the output of the second latch 12);
This is an adder that adds the outputs of 3.

Reference numeral 18 denotes a constant setter that outputs the constant Δ (or -Δ) described above. As the constant setter 18, for example, a dip switch is used. 19 is a first comparator that compares the output of the first subtracter 14 with a constant; 20 is a second subtractor 1;
A second comparator 21 which compares the output of 5 and a constant is a gate that performs the AND of the outputs of the first and second comparators 19 and 20. 22 is the first and second adder 16,1
A third adder 23 that adds the outputs of the third adder 22 is a divider that multiplies the output of the third adder 22 by 1/4.

The division by the divider 23 is performed by the third adder 22, for example.
This is achieved by shifting the output data of 2 bits to the right. 24 is the second latch 12 and divider 2
This is a selector that receives the outputs of 3 and selects and outputs one of them according to the output of the gate 21.

The operation of the circuit configured in this way is (1).

This will be explained in conjunction with equations (2) and (3). The Iζ image data output from the line memory 4 is latched into the first to third latches 11 to 13 at the timing shown in FIG.

In the figure, (a) is the latch clock, (b) is the data read from the line memory 4, (c) is the output Xi+1 of the first latch 11, and (d) is the output x+ of the second latch 12. , (E) is the output X i-1 of the third latch 13
are shown respectively.

The clock (a) arrow indicates the latch timing. 1st. Second. The third latches 11 to 13 output image data (density signals) Xito+, Xi, and Xl-1 on the same perpendicular line to the adjacent scanning lines, respectively.

The first subtractor 14 calculates (Xi÷1-Xi >), and the second subtractor 15 calculates <x+-+ -Xi.

Also, the first adder 16 is (Xi"+ -1-, Xi)
The second adder 17 calculates (Xi +X1-t)
Calculate. The first comparator 11 compares (Xi÷1-Xi) to a constant (or -△), and the second comparator 2o compares (Xi÷1-Xi) to a constant (or -△).
i-, -Xi) and the constant A (or -A).

On the other hand, the third adder 22 is <Xi++ +2Xi +X
i−+), and the divider 23 calculates (Xt+t+2Xi
+X+-1>/4 is calculated. Image data Xi and (Xi+++2XikiX!-t)/4 are input to the selector 24. One of these two inputs is selected by the output of the gate 21 and output as image data. In this case, the gate 21 is of the formula (1) or (
2) Select the output of the time divider 23 that satisfies the formula,
When the expression (1) or the expression (2) is not satisfied, a selection signal is given to the selector 24 to select the output of the second latch 12. As a result, the selector 24 outputs smoothed image data X for moving images, and outputs the original image Xi as is for still images.

The image data outputted from the smoothing circuit 5 in this way is subjected to signal processing such as γ correction in the subsequent signal processing circuit 6, and then regenerated into an analog image signal by the D/A converter 7. recorded. According to the invention,
Since frame images are always output, there is no possibility that image information will be lost.

Furthermore, since smoothed image data is output for a moving image, a comb-shaped 117 image does not occur.

In the explanation of 21 (above), the algorithms shown by equations (7) to (3) are used as a method for detecting moving images, but the present invention is not necessarily limited to this. Detecting movement of images Any method may be used as long as it is a method for detecting motion.The most expensive method for detecting motion is that it requires a semiconductor memory to store two frames of images. A proposed method is to memorize and compare the brightness If (?llI&) at the same point in two frames, and if the difference is larger than a certain level, it is determined that there is movement, and if it is within that, it is determined to be a still image. and something like this is also available.

(Effect of the invention in Song Dynasty) As explained in detail above, according to the present invention, smoothing processing is performed on both sides of moving images, and still images are directly copied in hard copy without losing image information. , - It is possible to record an image without blurring even on a screen with a lot of eye movement with a simple configuration.

[Brief explanation of drawings]

FIG. 1 is a configuration block diagram showing one embodiment of the present invention, and FIG.
Figure 3 shows an example of a television signal waveform, Figure 3 is an explanatory diagram of a numbering method, Figure 4 shows an example of data arrangement in a line memory, Figure 1, and Figure 5 shows an example of a specific configuration of a smoothing circuit. , FIG. 6 is a diagram showing the latch timing of image data, FIG. 7 is an explanatory diagram of the increment method, FIG. 8 is a diagram showing an example of information loss, and FIG. 9 is a diagram showing an example of smoothing processing.
FIG. 10 is a diagram showing scanning lines, FIG. 11 is a diagram showing an example of a pattern that is smoothed according to the present invention, and FIG. 12 is a diagram showing an example of a pattern that is not smoothed according to the present invention. 1...Decoder 2...-Number hold circuit 3...A/D converter 4...Line memory 5.
...Smoothing circuit 6...Signal processing circuit 7...
D/A converter 11-13...Latch 14.15
...Subtractor 16.17.22...Adder 18...Constant setter 19.20...Comparator 2
1... Gate 23... Divider 24...
Selector Patent Applicant: Konishi Rokusushin Kogyo Co., Ltd. Representative
Person Patent attorney Fuji Ijima 1 person Figure 9 Figure 10 Figure M11

Claims (2)

[Claims] (1) An image recording device that records an image based on an interlaced image signal is equipped with a detection means for detecting movement of the image, and configured to perform smoothing processing when there is movement in the image. An image recording device characterized by: (2) In an image recording device that records an image based on an interlaced image signal, adjacent scanning lines l_i
The image signals of pixels at vertical positions of _-_1, l_i, l_i_+_1 are X_i_-_1, X_i, X, respectively.
As _i_+_1, X_i and X_i of these image signals
Compare ____1, X_i and X_i_+_1, respectively,
An image recording device characterized in that it is configured to detect movement of an image based on the comparison result, and to perform smoothing processing if there is movement in the image.