JPH03291078A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce distortion due to band compression by recording one still picture with data quantity by plural frames of moving pictures so as to reduce the compression rate. CONSTITUTION:When picture information inputted from an input 1 is a moving picture, a switch 2 is used to input the information to a moving picture processing section 3, from which the input data is subjected to band compression and the result is outputted. When the input data is a still picture, the switch 2 is used to input the data to a still picture processing section 4, in which the data is subjected to band compression with lower compression rate than that at the band compression by the moving picture processing section 3 and small compression distortion. The output from the processing sections 3, 4 is selected by a switch 5 as to which of the data is to be recorded and the selected data is recorded by a recording section 6. Through the constitution above, the compression rate is increased for the moving picture for long time recording and in the case of a still picture, the compression rate is decreased to attain high picture quality recording. Thus, one still picture is recorded normally by using moving picture data quantity by plural frames.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a recording/reproducing device for recording image information.

VTR and digital VTR with less deterioration due to conventional technology dubbing
is being developed. Particularly in home digital VTRs, band compression technology is being used to record over long periods of time on small cassettes.

Bandwidth compression technology is a means of compressing the amount of data by removing redundant components of image information.

Furthermore, since distortion of the color signal is difficult to visually detect compared to the normal luminance signal, a method is used in which the band of the color signal is limited at the input stage to reduce the recording data rate. In particular, digital VTRs typically use luminance and color difference signals as input instead of R, G, and B signals.

Problems to be Solved by the Invention However, when band compression techniques are used as described above, distortion due to band compression also increases as the compression rate increases. For this reason, image quality distortion due to compression becomes a problem in still images where visual clumps are easily detected.

In particular, if a still image is output by a printer, image quality deterioration is more likely to be detected. Further, in printed still images, deterioration of color signals is easily detected, so it is difficult to significantly limit the color signal band at the input stage. In particular, since general printers handle R, G, and B signals rather than luminance and color difference signals, conversion distortion is also a problem.

It is an object of the present invention to solve the problems that occur when recording still images on such conventional digital VTRs.

Means for Solving the Problems The present invention provides a digital V
The present invention is a recording and reproducing apparatus characterized in that it has a still image recording means for recording still images.

The first invention is characterized in that the still image recording means records one still image with an amount of data equivalent to a plurality of frames of a moving image.

The second invention is characterized in that the still image recording means forms one image with a different number of pixels than the moving image input.

The third invention is characterized in that the still image recording means records as R, G, and B signals.

A fourth invention is characterized in that the still image recording means records without using band compression.

In a fifth aspect of the invention, the still image recording means records data as two types of data: data compressed by the moving image band compression means and data compressed as a difference signal between a decoded value of the compressed data and an input signal. It is characterized by

The sixth invention is characterized in that when the still image recording means performs pixel thinning of the input signal, one still surface is recorded as a plurality of frames, and the position of the thinned out pixel signal is different for each frame. According to a seventh aspect of the invention, the still image recording means records one still image as a plurality of frames, and has a quantization changing means that gradually changes the quantization used when compressing each frame. Features.

In the eighth invention, the still image recording means continuously records n images in a certain period of time.
When recording still images, the amount of data recorded per image is one nth of the amount of video data that can be recorded within the certain period of time.
It is characterized by the following:

A ninth invention is characterized in that the still image recording means records a still image simultaneously with a moving image.

Effects With the above-described configuration, when the first invention is used, one still image can be recorded with the amount of data equivalent to multiple frames of a moving image, so the compression ratio can be reduced and distortion due to band compression can be reduced.

By using the second invention, it is possible to record images that are more detailed than moving images, so it is possible to improve the image quality of still images.

By using the third invention, since a still image can be recorded as R, G, and B signals, distortion caused by filter processing of R, G, and B vs. luminance and color difference conversion can be reduced.

By using the fourth invention, since still images are recorded without using band compression, distortion due to band compression can be eliminated.

When the fifth aspect of the invention is used, an image can almost be reproduced using only the data compressed by the moving image band compression means, so high-speed searches for still images, etc. are possible.

By using the sixth invention, by interpolating pixel signals from a plurality of frames, it is possible to improve the band of the reproduced signal.

By using the seventh invention, it becomes possible to reduce quantization errors by using quantization values at the same position over a plurality of frames.

By using the eighth aspect of the invention, recording can be performed at approximately the same data rate for both still image recording and moving image recording, making it possible to share circuits.

By using the ninth invention, it becomes possible to record still images simultaneously with moving images. Therefore, when recording a moving image, it is possible to record only the parts that you want to record more beautifully as still images.

Example The present invention will be explained below using examples.

FIG. 1 is a block diagram of an embodiment of the first invention. 1st
In the figure, 1 is an input section of the apparatus, 2 is a switch, 3 is a moving image processing section, 4 is a still image processing section, 5 is a switch, and 6 is a recording section. In this embodiment, when the image information inputted from the input 1 is a moving image, the input data is inputted to the moving image processing section 3 by the switch 2. The video processing unit 3 performs band compression on the input data and outputs the compressed data. Further, when the input data is a still image, the input data is inputted to the still image processing section 4 by the switch 2. The still image processing section 4 performs band compression with a lower compression rate and less compression distortion than the band compression performed by the moving image processing section 3. The outputs of the video processing section 3 and the still image processing section 4 are output through the switch 5.
Which one is to be recorded is selected and recorded in the recording section 6. In the recording/returning device of this embodiment, it is possible to record for a long time with a high compression rate for moving images, and to record high quality images by decreasing the compression rate for still images. Therefore, in this embodiment, one still image is normally recorded using the data amount of a plurality of frames of moving images.

FIG. 2 is a block diagram of a second embodiment of the invention. Second
7 in the figure is the first input section of this embodiment, 8 is the second input section,
9 is a moving image processing section, 10 is a still image processing section, 11 is a switch, and 12 is a recording section. In this embodiment, a moving image is input from the first human power section 7, and a still image is input from the second human power section 8. The moving image input from the first input section is band-compressed by the moving image processing section 9 and output. Further, the still image input from the second human power section is band-compressed by the still image processing section 10 and output.

Outputs from the moving image processing section 9 and the still image processing section 10 are selected by a switch 11 and recorded in a recording section 12 . With this configuration, in this embodiment, it is possible to change the number of input pixels between moving images and still images. Therefore, with still images, it is possible to record finer images with a larger number of pixels than with moving images.

FIG. 3 is a block diagram of a third embodiment of the invention. Third
13 in the figure is a luminance color difference signal (Y, CI, C2) input section, 1
4 is an R, G, B input section, 15 is a moving image processing section, 16 is a still image processing section, 17 is a switch, and 18 is a recording section. In this embodiment, when a moving image is displayed, the luminance and two color difference signals are input from the luminance/color difference input section 13, and when a still image is displayed, the signals are input as R, G, and B signals from the R, G, and B input section 14. The input luminance and color difference signals of the moving image are processed by the moving image processing section 15, and the R, G, and B signals of the still image are processed by the still image processing section 16.

Outputs from the moving image processing section 15 and the still image processing section 16 are selected by a switch 17 and recorded in the recording section 18 . In the present invention, since still images can be recorded using R, G, and B signals, it is possible to perform processing with small distortion when outputting on a printer or handling data on a computer.

The fourth part is a block diagram of an embodiment of the fourth invention. Fourth
19 is an input section, 20 is a switch, 21 is a video compression section,
22 is a switch, and 23 is a recording section. In this example,
When the signal input from the input section I9 is a moving image, it is band-compressed by the moving image compression section 21 via the switch 20 to reduce the amount of data. Further, when the input signal is a still image, the switch 20 bypasses the band compression circuit. The switch 22 records the band-compressed signal in the recording section 23 when a moving image is displayed, and records the signal without band compression when a still image is displayed. This embodiment enables high-quality recording of still images without any distortion due to band compression.

FIG. 5 is a block diagram of an embodiment of the fifth invention. Fifth
In the figure, 24 is an input section, 25 is a video compression section, 26 is a compression decoding section, 27 is a subtracter, 28 is a differential signal compression section, and 29 is a first
The recording section 30 is a second recording section. In this embodiment, when the signal inputted from the input section 24 is a moving image, the signal is band-compressed by the moving image compression section 25 and recorded in the first recording section. Furthermore, when the input signal is a still image, first the video compression section 2
In step 5, the same compression as for moving images is performed, and the compressed data is recorded in the first recording unit 1. At the same time, the data compressed by the video compression section 2 is decoded by the compression decoding section 26. Compression decoding section 2
A subtracter 27 calculates the difference between the signal decoded in step 6 and the input signal, and the difference signal is compressed by a difference compression section 28 and recorded in a second recording section 30. In this example, still images,
Both moving images can be recorded in the first recording unit 29 in the same format. Therefore, still images can be decoded at high speed using only the data in the first recording section 29, similar to moving images.

Furthermore, for a still image, it is also possible to restore an image with smaller compression distortion by decoding the difference signal recorded in the second recording section and adding it to the decoded value of the data in the first recording section.

FIG. 6 is a detailed explanatory diagram of the sixth invention.

In this embodiment, one still image is repeatedly recorded a plurality of times. In the example shown in FIG. 6, one still image is recorded as two frame signals. The feature of this embodiment is that only even-numbered pixel signals are recorded when recording the first frame, and only odd-numbered pixel signals are recorded when recording the second frame. This reduces the number of pixels to 1 during recording.
72, it becomes possible to lower the compression rate of band compression. Therefore, compression distortion can be reduced even if each frame is recorded with the same amount of data as a moving image. Furthermore, during playback, the original still image can be restored from two frames as shown in FIG. Furthermore, it is also possible to use the present invention only for color difference signals. In this case, it is possible to widen the color difference band by collecting color difference signals recorded at different positions in a plurality of frames.

FIG. 7 is a detailed explanatory diagram of the seventh invention.

In this embodiment, one still image is repeatedly recorded a plurality of times. In the example shown in FIG. 7, one still image is recorded as a two-frame signal. A feature of this embodiment is that the quantizer when recording the first frame and the quantizer when recording the second frame have different dark values. In the example of FIG. 7, when the level of the input signal is 7, it is quantized to 3 in the first frame and quantized to 4 in the second frame. In this case, on the playback side, the quantization value (3) recorded in the first frame is decoded as 6 or 7,
The quantized value (4) recorded by the second frame is decoded as 7 or 8. Therefore, the output value 7 is obtained from the decoded values of the two frames. By changing the quantization characteristics between frames in this way, it is possible to improve quantization distortion. Furthermore, the same effect can be obtained by adding a different offset value to the input signal for each frame without changing the quantization characteristics.

The table provides a detailed explanation of the eighth invention. This embodiment is for the case where still images are continuously recorded.

The example in the table shows an example in which 10 still images are continuously recorded per second. On the other hand, assuming that 30 frames per second are recorded for video, the amount of data per frame of still images (300 KB) is set to three times the amount of data per frame of video (100 KB), as shown in the table. As a result, the amount of data recorded per second is 3000 KB for both moving images and still images. In this way, by making the amount of data per second almost the same when recording a moving image and when recording a still image, it becomes possible to use a common recording and reproducing circuit.

FIG. 8 is a detailed explanatory diagram of the ninth invention.

This embodiment is for the case where still images are recorded simultaneously with moving images. In the example shown in FIG. 8, moving images are recorded on the tape at high speed using a rotating cylinder, and still images are recorded at low speed using a fixed head. Such a configuration makes it possible to record still images of higher quality at the same time as moving images are recorded. It is also possible to record only the differential signal explained in FIG. 5 with a fixed head. Furthermore, it is also possible to record still image information in a recording area for audio signals, digital data, etc. recorded by a rotary head in addition to the fixed head.

The present invention has been described above, but in the above embodiment, the moving image processing section and the still image processing section are independent. However, in general, most circuits can be shared. Furthermore, since still image processing requires a longer processing time than video processing,
It is possible to use more complex and efficient bandwidth compression techniques. Therefore, even if the amount of data is equivalent to one frame of a moving image, it is also possible to record a still image with less compression distortion.

Effects of the Invention With the configuration described above, when the first invention is used, one still image can be recorded with the amount of data equivalent to multiple frames of video, so the compression ratio can be reduced and distortion due to band compression can be reduced. .

By using the second invention, it is possible to record images that are more detailed than moving images, so it is possible to improve the image quality of still images.

By using the third invention, since a still image can be recorded as R, G, and B signals, distortion caused by filter processing of R, G, and B vs. luminance and color difference conversion can be reduced.

By using the fourth invention, since still images are recorded without using band compression, distortion due to band compression can be eliminated.

When the fifth aspect of the invention is used, an image can almost be reproduced using only the data compressed by the moving image band compression means, so high-speed searches for still images, etc. are possible.

By using the sixth invention, by interpolating pixel signals from a plurality of frames, it is possible to improve the band of the reproduced signal.

By using the seventh invention, it becomes possible to reduce quantization errors by using quantization values at the same position over a plurality of frames.

When the eighth invention is used, it is possible to record at almost the same data rate both in still image recording and moving image recording, so circuits can be shared.

By using the ninth invention, it becomes possible to record still images simultaneously with moving images. Therefore, when recording a moving image, it is possible to record only the parts that you want to record more beautifully as still images.

As described above, by using the present invention, it becomes possible to record and reproduce high-quality still images using a digital VTR.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a recording/reproducing apparatus as an embodiment of the first invention, FIG. 2 is a block diagram showing a recording/reproducing apparatus as an embodiment of the second invention, and FIG. 3 is a block diagram showing a recording/reproducing apparatus as an embodiment of the second invention. FIG. 4 is a block diagram showing a recording and reproducing apparatus which is an embodiment of the fourth invention, FIG. 5 is an embodiment of the fifth invention. FIG. 6 is a block diagram showing a recording/reproducing apparatus according to the sixth embodiment of the invention.

Claims (1)

[Claims] (1) Digital VTR that records and plays back digital moving images
A recording and reproducing device characterized in that it has still image recording means for recording still images. (2) The recording/reproducing apparatus according to claim 1, wherein the still image recording means records one still image with an amount of data equivalent to one frame of a moving image by the same processing as that of a moving image. (3) Claim characterized in that the still image recording means records one still image with an amount of data equivalent to multiple frames of a moving image.
1) The recording/reproducing device described above. (4) The still image recording means has a different number of pixels than the video input.
The recording/reproducing apparatus according to claim 1, wherein the recording/reproducing apparatus constitutes one image. (6) The recording/reproducing apparatus according to claim (2) or (3), wherein the still image recording means records as R, G, and B signals. (7) The recording/reproducing apparatus according to claim (2) or (3), wherein the still image recording means records without using band compression. (8) The still image recording means records two types of data: data compressed by the video band compression means and data compressed from a difference signal between the decoded value of the compressed data and the input signal. The recording and reproducing apparatus according to claim 3, characterized in that: (9) The still image recording means records one still image as a plurality of frames when thinning out the pixels of the signal at the time of input, and the position of the thinned out pixel signal is different for each frame. The recording/reproducing apparatus according to claim (3). (10) The still image recording means records one still image as a plurality of frames when thinning pixels of a color signal at the time of input, and the position of the thinned out color difference differs for each frame. The recording/reproducing apparatus according to claim (3). (11) A claim characterized in that the still image recording means has a quantization changing means that records one still image as a plurality of frames and changes the quantization used when compressing each frame little by little. The recording/reproducing device according to item (3). (12) The quantization changing means adds a specific offset value to the value to be quantized before quantization, and the offset value differs from frame to frame.
1) The recording/reproducing device described above. (13) When the still image recording means continuously records n still images in a certain period of time, the amount of data recorded per image is one-nth of the amount of data of a moving image that can be recorded within the certain period of time. The recording/reproducing apparatus according to claim 2 or 3, characterized in that: (14) Claim characterized in that the still image recording means has a simultaneous recording means for recording a still image at the same time as a moving image (
1) The recording/reproducing device described above. (15) The recording and reproducing apparatus according to claim 14, wherein the simultaneous recording means records the still image signal on a linear track, an audio signal recording portion, or a digital data recording portion. (16) Claim characterized in that the simultaneous recording means compresses the difference signal between the decoded signal of the moving image recording signal and the still image input signal and records it on the linear track, the audio signal recording section, or the digital data recording section. The recording/reproducing device according to (8) or (14).