JPH118836A - Still picture processor for interlaced image - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the display of a still picture from moving vertically when a moving image of an interlaced image is performed frame-by-frame reproduction and shown in a still picture. SOLUTION: Optional image data equivalent to one field is stored in field memory 12 and repeatedly read and shown in display timing of an odd field and an even field. The content of the memory 12 is updated to image data of the next field every time frame sending scan is performed. When image data of an odd field is stored in the memory 12, image data that is read from the memory 12 is selected and outputted. When image data of an even field is stored in the memory 12, image data that is read from the memory 12 in display timing of an even field is selected and outputted, and image data which is read from the memory 12 in display timing of an odd field and is delayed by one line in a line buffer 18 is selected and outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a still image processing apparatus for holding an arbitrary one-field data of interlaced scanning image data in a field memory and reproducing the same as a still image. Is solved with a simple configuration.

[0002]

2. Description of the Related Art As a method of reproducing a video image of an interlaced scanning system such as an NTSC system as a still image (for example, a still function of a video tape recorder), the following two methods are conventionally used.
There were two ways.

(A) A method of alternately displaying odd field images and even field images. That is, at the display timing of the odd field, the image of the odd field is displayed, and at the display timing of the even field, the image of the even field is displayed.

(B) A method of storing image data of one of an odd-field image and an even-field image in a field memory, and reading out and displaying the odd-field display timing and the even-field display timing in common and repeatedly .

[0005] In the NTSC system, there are 525 scanning lines including odd and even fields.
In this specification, “odd field” refers to a field in which the top scan line and every other scan line are valid (ie, displayed), and “even field” refers to the top scan line. The field where the scan line is invalid (ie not displayed) and the next scan line and every other scan line thereafter are valid.

[0006]

According to the method (a), since the image of the odd field and the image of the even field have a time difference (1/60 second in the case of the NTSC system), they are moving at high speed. When playing back an image of an object as a still image,
Since the position of the object moves between the display of the odd field and the display of the even field, and this movement is repeated, there is a problem that the displayed image flickers and the object appears to be blurred.

Further, according to the method (b), since only one field image is displayed, no problem occurs due to the time difference between the odd field image and the even field image, but the odd field image and the even field image are displayed. In the field image, there is a problem that the image moves up and down by one line (scanning line). This phenomenon will be described.

Assume that an image for one frame (consisting of two fields of an odd field and an even field) is displayed on the display screen as shown in FIG. .. Represent the numbers of the scanning lines. FIG. 2B shows an image of the odd field of this image, and FIG. 2C shows an image of the even field. When the image data of the odd field is stored in the field memory and the still image is reproduced, the scanning line number of the image data stored in each address of the field memory and the timing at which the image data is read out from the field memory and displayed on the display device The relationship between and the position is shown in columns (A) and (B) of Table 1.

[0009]

[Table 1] According to Table 1, for example, the image data of line 1 is displayed at the position of line 1 in the display of the odd field, and is displayed at the position of line 2 in the display of the even field. As a result, the image data of line 1 is apparently at the center position of the display position in both fields (that is, the position of line 1.5).
(See Table 1 (C)), it appears to be displayed 0.5 lines below the original display position (ie, line 1) (see Table 1 (D)).

On the other hand, when the image data of the even field is stored in the field memory, the scanning line number of the image data stored in each address of the field memory and the timing of reading out the image data from the field memory and displaying it on the display device Table 2 (A),
This is shown in column (B).

[0011]

[Table 2] According to Table 2, for example, the image data of the line 2 is displayed at the position of the line 1 in the display of the odd field, and is displayed at the position of the line 2 in the display of the even field. As a result, the image data of line 2 is apparently at the center position of the display position in both fields (that is, the position of line 1.5).
(See Table 2 (C)), it appears to be displayed 0.5 lines higher than the original display position (ie, line 2) (see Table 2 (D)).

FIG. 3 shows the above relationship in a display image on a display screen. Thus, the conventional (b)
According to the method of (1), the image of the odd field appears 0.5 lines lower than the original display position, and the image of the even field appears 0.5 line higher than the original display position. When the image was fed, the image moved up and down by the width of one line. For this reason, a sense of incongruity occurs when frame-by-frame playback is performed while paying attention to a specific portion in the image.

As a method of solving the problem of the vertical movement of the image at the time of the frame advance, when the image data of the odd field is held and displayed, the held image data is kept as it is at the display timing of the odd field. Display,
At the display timing of the even field, image data obtained by interpolating the image data of the odd field is generated and displayed (for example, the image data of line 2 is generated from the image data of lines 1 and 3), and the image data of the even field is held. In the case of displaying the image data, the held image data is displayed as it is at the display timing of the even field, and the image data obtained by interpolating the image data of the even field is generated and displayed at the display timing of the odd field (lines 2 and 4). Such as generating image data of line 3 from image data). However, according to this method, since an arithmetic unit for interpolation is required, there is a disadvantage that the number of units is increased and the cost is increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the prior art and to provide an interlaced image still image processing apparatus which solves the problem of vertical movement of an image during frame-by-frame reproduction without using interpolation. Is what you do.

[0015]

According to the present invention, data of one arbitrary field of interlaced scanning image data constituting one frame by two fields of an odd field and an even field is rewritably stored in a field memory, In the interlaced image still image processing apparatus in which the stored image data is repeatedly read out at the display timing of the odd field and the display timing of the even field and transmitted to the display device, the image data of the odd field is stored in the field memory. Is displayed, the image data of each scan line is transmitted to the display device so as to be displayed at the display timing of the corresponding scan line at the display timing of the odd field, and the image data of each scan line is transmitted at the display timing of the even field. Scan line When the image data of the even field is stored in the field memory, the image data of each scan line is displayed at the display timing of the corresponding scan line at the display timing of the even field. The display data is sent to the display device so as to be displayed, and the image data of each scan line is sent to the display device so as to be displayed at the display timing one line below the corresponding scan line at the display timing of the odd field.

According to this, since the image data of the odd field and the image data of the even field both appear to be apparently displayed lower than the original display position by 0.5 line, the image data at the time of frame-by-frame reproduction is displayed. Vertical movement of the image can be prevented.

More specifically, when the image data of the odd field is stored in the field memory, the present invention reads out the image data as it is at the display timing of the odd field and the display timing of the even field, and outputs the read image data to the display device. When the image data of the even field is stored in the field memory, the image data is read out as it is at the display timing of the even field and transmitted to the display device. For scanning period (for one line)
It is possible to configure so that the data is read out with a delay and sent to the display device.

According to this, when the image data of the odd field is stored in the field memory, the image data is read as it is at the display timing of the odd field and the display timing of the even field, so that the apparent original display It appears to be displayed 0.5 lines below the position. Also, when the image data of the even field is stored in the field memory,
By reading this image data as it is at the display timing of the even field and reading it out at the display timing of the odd field with a delay of one horizontal scanning period (that is, shifting it down by two lines), it is apparent that The image appears to be displayed 0.5 lines lower than the original display position. Therefore, when displaying the image data of the odd field and the displaying of the image data of the even field, it appears that the display is lower than the original display position by 0.5 line in both cases. It is possible to prevent the image from moving up and down during reproduction.

More specifically, the present invention relates to a field memory for rewritably storing any one field of interlaced scanning image data constituting one frame by two fields of an odd field and an even field. Writing / reading control means for writing image data of an arbitrary field into the field memory and repeatedly reading the written image data at the display timing of the odd field and the display timing of the even field; and reading from the field memory. A line buffer for delaying the output image data by one horizontal scanning period; inputting the image data read from the field memory and the image data output from the line buffer, and selecting one of the image data appropriately selected Output to the display device A multiplexer for outputting the identification information of the odd field / even field of the image data stored in the field memory; and a display for outputting the identification information of the odd field / even field of the display timing. Field identification information output means, based on each identification information output from the image data field identification information output means and the display field identification information output means, when the image data of the odd field is stored in the field memory, The image data read from the field memory is directly selected and output from the multiplexer. When the image data of the even field is stored in the field memory, the image data is read from the field memory at the display timing of the even field. The multiplexer selects and outputs the output image data as it is, and selectively outputs the image data read from the field memory at the display timing of the odd field and delayed by one horizontal scanning period in the line buffer from the multiplexer. Signal selection control means for controlling the multiplexer.

When the image data of the even field is stored in the field memory and displayed with a delay of one horizontal scanning period at the display timing of the odd field, the display timing of the first line of the odd field is displayed. , The image data of the first line (that is, line 2) stored in the field memory is displayed at the display timing of the first line of the odd field in some cases (that is, this 1).
The image data of the line is displayed on lines 1, 2, 3) so that no blank space can be generated.

Further, another invention of this application is to store arbitrarily one field of interlaced scanning image data constituting one frame by two fields of an odd field and an even field in a field memory in a rewritable manner. In an interlaced image still image processing apparatus in which stored image data is repeatedly read out at odd field display timings and even field display timings and sent to a display device, odd field image data is stored in a field memory. When the image data of each scan line is displayed at the display timing of the odd field, the image data of each scan line is transmitted to the display device so as to be displayed at the display timing of the corresponding scan line. 1 of scan line When the image data of the even-numbered field is stored in the field memory, the image data of each scan line is displayed at the display timing of the even-numbered field. The display data is sent to the display device so as to be displayed at the display timing, and the image data of each scan line is sent to the display device so as to be displayed at the display timing of the corresponding scan line at the display timing of the odd field.

According to this, since the image data of the odd field and the image data of the even field both appear to be apparently displayed 0.5 lines higher than the original display position, the frame data at the time of frame-by-frame reproduction is displayed. Vertical movement of the image can be prevented.

More specifically, when the image data of the even field is stored in the field memory, this image data is read out and displayed as it is at the display timing of the odd field and the display timing of the even field. When the image data of the odd field is stored in the field memory, the image data is read out as it is at the display timing of the odd field and sent to the display device, and the image data is transmitted at the display timing of the even field. It is possible to adopt a configuration in which data is read out earlier by one horizontal scanning period (one line) and transmitted to the display device.

According to this, when the image data of the even field is stored in the field memory, the image data is read as it is at the display timing of the odd field and the display timing of the even field, so that an apparently original display can be obtained. It appears to be displayed 0.5 lines above the position. Also, when image data of an odd field is stored in the field memory,
By reading this image data as it is at the display timing of the odd field, and reading this image data earlier by one horizontal scanning period at the display timing of the even field (that is, shifting it up by two lines) and sending it out, it appears apparently. It appears to be displayed 0.5 lines higher than the original display position. Therefore, when displaying the image data of the odd field and the displaying of the image data of the even field, both appear to be displayed 0.5 lines higher than the original display position, so that the frame feed It is possible to prevent the image from moving up and down during reproduction.

[0025]

Embodiments of the present invention will be described below. This is because when the image data of the odd field (data of lines 1, 3, 5,...) Is stored in the field memory, the image data of each scanning line is displayed at the display timing of the odd field. Are sent to the display device so as to be displayed at the display timing of the lines 1, 3, 5,..., And the image data of each scanning line is displayed at the display timing of the even-numbered field (line 2, 4, 6,...). ..) Are sent to the display device so as to be displayed at the display timing, and even field image data (data of lines 2, 4, 6,...) Is stored in the field memory. Sends the image data of each scanning line to the display device so as to be displayed at the display timing of the corresponding scanning line (lines 2, 4, 6,...). At the display timing of the odd field, the image data of each scan line is sent to the display device so as to be displayed at the display timing one line below (line 3, 5, 7,...) The corresponding scan line, and is sent to the display device. Both the image data and the image data of the even-numbered field are apparently displayed lower than the original display position by 0.5 line.

FIG. 1 shows a still picture processing apparatus 1 according to the present invention.
FIG. 3 is a block diagram showing a configuration of a 0. Still image processing device 10
Is supplied with interlaced image data (digital data) of the NTSC system or the like reproduced from a video tape recorder, a DVD player, or the like. The field memory 12 holds rewritable image data for one field. The writing / reading control unit 14 writes and reads out the input image data in the field memory 12 on a field basis. At the time of normal reproduction, the field memory 12 is sequentially updated in field units,
The image data read from the field memory 12 passes through a multiplexer 16, a D / A converter, a television signal generation circuit and the like, and is displayed on a display device such as a television monitor (not shown).
Sent to

The write / read control means 14 stops updating the field memory 12 when a still operation is instructed by a user operation (video tape recorder, D
The playback position of the VD player or the like is also temporarily stopped at that position. ), The image data of one field (odd field or even field) stored in the field memory 12 at that time is held as it is, and this is repeatedly read at the display timing of the odd field and the display timing of the even field. The image data output from the field memory 12 is input to one input terminal (1) of the multiplexer 16 as it is, and
, Which is delayed by one horizontal scanning period (that is, readout delayed by one horizontal scanning period).
6 is input to the other input terminal (2). When frame-by-frame playback is instructed, the video tape recorder, DV,
The playback position of the D player or the like is advanced to the next field, the contents of the field memory 12 are updated to the image data of the field, and the frame-by-frame playback of the still image is performed.

Image data field identification information output means 2
0 indicates whether the image data currently stored in the field memory 12 is odd field image data or even field image data based on the field type identification information included in the input image data. (Image data field identification information). The write / read control unit 14 outputs information (display field identification information) for identifying whether the current display timing is an odd field or an even field, as a display field identification information output unit.

The signal selection control means 22 selects and outputs one of the two inputs of the multiplexer 16, outputs the input from one input terminal (1) during normal reproduction, and outputs the input from a still image reproduction ( In the case of frame-by-frame playback, input selection is switched as shown in FIG. 4 in accordance with the field type of image data held in the field memory 12 and the field type of display timing. That is, when the image data of the odd field is stored in the field memory 12, the input from one input terminal (1) is output, and when the image data of the even field is stored in the field memory 12, the even number is output. At the display timing of the field, the input from one input terminal (1) is output, and at the display timing of the odd field, the input from the other input terminal (2) (that is, image data delayed by one horizontal scanning period) is output.
When image data of the even field is stored, the input from one input terminal (1) is output at the display timing of the line 1 of the odd field, whereby the line 1 is output.
Can be prevented from being displayed in a blank state.

An image display operation at the time of reproducing a still image by the input switching operation in the multiplexer 16 will be described. The image display operation when the image data of the odd field is stored in the field memory 12 is shown in Table 1 above.
Is the same as that shown in FIG. That is, at this time, the display image appears to be displayed 0.5 lines below the original display position. On the other hand, the field memory 12
Table 3 shows the image display operation when the image data of the even field is stored in the table.

[0031]

[Table 3] According to Table 3, since the display timing of the odd field is delayed by one horizontal scanning period, the display is performed two lines lower than the conventional method (Table 2) (Tables 2 and 3 ( B) See left column). Therefore, the display image appears to be displayed 0.5 lines below the original display position (Table 3 (D)). In this way, regardless of whether the image data stored in the field memory 12 is an odd field or an even field, it seems that the image data appears to be displayed 0.5 lines lower than the original display position, so that the frame feed is performed. Does not cause the image to move up and down. FIG. 5 shows the above relationship by a display image on a display screen.

Instead of the delay in the line buffer 18, the delay is caused by the read timing control of the field memory 12 by the write / read control means 14 (that is, the image data of the even field is stored in the field memory 12). In some cases, the read address is read out by one line at the display timing of the odd field.)

[0033]

Another embodiment of the present invention will be described below. This is because the odd field image data (data of lines 1, 3, 5,...) Is stored in the field memory.
Is stored, the image data of each scan line is transmitted to the display device so as to be displayed at the display timing of the corresponding scan line (line 1, 3, 5,...) At the display timing of the odd field, The image data of each scanning line is displayed at the display timing of one line (line 0, 2, 4,...) Of the corresponding scanning line at the display timing of the even field (line 0 is not displayed because it does not actually exist). ), And the image data of the even field (lines 2, 4, 6,...) Is stored in the field memory.
..) Are stored, the display device displays the image data of each scan line at the display timing of the corresponding scan line (line 2, 4, 6,...) At the display timing of the even field. To the display device so that the image data of each scan line is displayed at the display timing of the corresponding scan line (line 1, 3, 5,...) At the display timing of the odd field. Both the image data and the image data of the even field are displayed so as to be apparently raised by 0.5 line from the original display position.

According to the present invention, for example, in the configuration shown in FIG. 1, the read address output from the write / read control means 14 at the time of still reproduction or frame-by-frame reproduction is always advanced by one address (that is, by one horizontal scanning period). When the image data of the even-numbered field is held in the field memory 12 at that time, the input from the other input terminal (2) of the multiplexer 16 is always selected and output.
When the image data of the odd field is held,
At the display timing of the odd field, the multiplexer 1
6 is selectively output from the other input terminal (2) of the multiplexer 16, and at the display timing of the even field, the input from the one input terminal (1) of the multiplexer 16 is selectively output (that is, read out earlier by one horizontal scanning period). Equivalent to.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a still image processing device according to the present invention.

FIG. 2 is a diagram showing an image of one frame by interlaced scanning and images of an odd field and an even field.

FIG. 3 is a diagram illustrating a display image on a display device when a still image is reproduced by a conventional device.

FIG. 4 is a flowchart showing a signal selection operation of a multiplexer 16 by a signal selection control unit 22 of FIG.

FIG. 5 is a diagram illustrating a display image on a display device during still image reproduction according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Still image processing apparatus 12 Field memory 14 Writing / reading control means, display field identification information output means 16 Multiplexer 18 Line buffer 20 Image data field identification information output means 22 Signal selection control means

Claims (6)

[Claims] 1. An arbitrarily arbitrarily stored data of one field of interlaced scanning image data constituting one frame by two fields of an odd field and an even field in a field memory, and storing the stored image data in an odd number field. In the still image processing apparatus for interlaced images, which is repeatedly read out at the display timing of the field and the display timing of the even field and sent to the display device, when the image data of the odd field is stored in the field memory, the odd field The display data is transmitted to the display device so that the image data of each scan line is displayed at the display timing of the corresponding scan line at the display timing, and the image data of each scan line is displayed at the display timing of the corresponding scan line at the display timing of the even field. Display with When the image data of the even field is stored in the field memory, the image data of each scan line is displayed at the display timing of the corresponding scan line at the display timing of the even field. The interlaced image is transmitted to the display device so as to display the image data of each scanning line at the display timing of one line below the corresponding scanning line at the display timing of the odd field. Image processing device. 2. The display device according to claim 1, wherein when the image data of the even field is stored in the field memory, the image data of the first line of the even field is displayed at the display timing of the first line of the odd field. 2. The still image processing apparatus for interlaced images according to claim 1, which is transmitted. 3. An interlaced scanning type image data which constitutes one frame by two fields of an odd field and an even field is rewritably stored in a field memory, and the stored image data is stored in an odd number field. In the still image processing apparatus for interlaced images, which is repeatedly read out at the display timing of the field and the display timing of the even field and transmitted to the display device, when the image data of the odd field is stored in the field memory, The data is read out as it is at the display timing of the odd field and the display timing of the even field and sent to the display device. When the image data of the even field is stored in the field memory, the data is read at the display timing of the even field. The image data is read as it is sent to the display device, still image processing unit of an interlaced image formed by the image data at the display timing of the odd field is read out is delayed one horizontal scanning period so as to deliver to the display device. 4. A field memory for rewritably storing data of one field of interlaced scanning image data constituting one frame by two fields of an odd field and an even field, and an arbitrary one field in the field memory. Write / read control means for writing image data for one minute, and repeatedly reading the written image data at the display timing of the odd field and the display timing of the even field;
A line buffer delayed by a horizontal scanning period, and inputting image data read from the field memory and image data output from the line buffer,
A multiplexer for outputting one of the appropriately selected image data and sending it to the display device; an image data field identification information output means for outputting odd field / even field identification information of the image data stored in the field memory; A display field identification information output unit that outputs odd field / even field identification information of a display timing; and a display field identification information output unit that outputs the image data field identification information output unit and the display field identification information output unit. When the image data of the odd field is stored in the field memory, the image data read from the field memory is directly selected and output from the multiplexer, and when the image data of the even field is stored in the field memory, Even number The image data read from the field memory at the field display timing is selected and output from the multiplexer as it is, and the image data read from the field memory at the odd field display timing and delayed by one horizontal scanning period by the line buffer is obtained. A still image processing apparatus for an interlaced image, comprising: signal selection control means for controlling the multiplexer so as to selectively output from the multiplexer. 5. An arbitrarily arbitrarily stored one field of interlaced scanning image data constituting one frame by two fields of an odd field and an even field in a field memory, and storing the stored image data in an odd number field. In the still image processing apparatus for interlaced images, which is repeatedly read out at the display timing of the field and the display timing of the even field and sent to the display device, when the image data of the odd field is stored in the field memory, the odd field The display data is sent to the display device so that the image data of each scan line is displayed at the display timing of the corresponding scan line, and the image data of each scan line is displayed at one display line timing of the corresponding scan line. Display tie on When the image data of the even field is stored in the field memory, the image data of each scan line is displayed at the display timing of the even field. A still image of an interlaced image which is transmitted to the display device so as to be displayed in the display device, and is transmitted to the display device so that the image data of each scanning line is displayed at the display timing of the corresponding scanning line at the display timing of the odd field. Processing equipment. 6. An arbitrarily rewritable data of one field of interlaced scanning image data constituting one frame by two fields of an odd field and an even field is rewritably stored in a field memory, and the stored image data is stored in an odd number field. In the still image processing apparatus for interlaced images, which is repeatedly read out at the display timing of the field and the display timing of the even field and transmitted to the display device, when the image data of the even field is stored in the field memory, Data is read as it is at the display timing of the odd field and the display timing of the even field and sent to the display device. When the image data of the odd field is stored in the field memory, the data is read at the display timing of the odd field. The image data is read as it is sent to the display device, still image processing unit of an interlaced image composed so as to the image data at the display timing of the even field is read out by advancing one horizontal scanning period is sent to the display device.