JP3051472B2 - Image processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, an image processing apparatus having a freeze function.

[0002]

2. Description of the Related Art As an example of an image processing apparatus for decoding a video from image information input from a transmission medium or a storage medium, there is an apparatus having a configuration as shown in FIG. Conventionally, video decoding has been performed in the image processing apparatus as follows. An image information signal transmitted via a transmission path (not shown)
01 is input. The transmission path here is a transmission medium such as a terrestrial radio wave such as an optical fiber, a satellite, and a microwave for immediate transmission, and an optical space.
It is a storage medium such as a tape-shaped medium such as a digital VTR or DAT, a disk-shaped medium such as a floppy disk or an optical disk, or a solid medium such as a semiconductor memory. Since the input image information signal includes video information, which is information of the video itself, and auxiliary information related to control of the image processing apparatus, the data reproducing unit 202 detects synchronization and separates the video information and the auxiliary information. Are performed. Since the separated video information has been encoded for information amount compression on the transmission side, the decoding process is performed in the decoding unit 203.

On the other hand, the separated attached information stores video information in the frame memory 0 of the n frame memories 204.
To (n-1), or how and when to read the video information written to which frame memory of the frame memory 204. The attached information is input to the memory control unit 205, and control information (including the frame memory number to be written) related to writing of image data is written.
And the read-related control information (including the frame memory number to be read) are held as the write information memory 210 or the read information memory 211, respectively. The memory control unit 205 writes the image data output from the decoding unit 203 to the frame memory 204 and reads the image data from the frame memory 204 according to the attached information.

[0004] The read image data is sent to a video processing unit 20.
7 and display data with various video switching effects such as scrolling and wiping using information stored in a plurality of frame memories.
08 and output to an output terminal 209 and displayed on a display unit such as a monitor. In addition, the freeze switch 206
A switch for stopping a display image with an arbitrary image. The memory control unit 205 controls writing or reading of a memory using information input from a freeze switch 206 in addition to the above-described attached information. Becomes

[0005] In the image processing apparatus having the freeze function as described above, a specific operation of the memory control unit 205 will be described. In the normal operation, the auxiliary information is created so that writing of the next image data is not instructed to the frame memory being read.
However, when the freeze function is operated, there is a case where the image data which should have been already normally displayed is continuously displayed. In this case, since the image data being displayed needs to be held in the frame memory, the image data for which the frame memory to be held is specified as the writing destination must be allocated to another frame memory.

FIG. 3 is a flowchart showing the operation of the memory control unit 205 at this time, divided into a writing side and a reading side. First, FIG. 3-1 showing the time of writing image data will be described. When the image data write command is detected (S301-YES), the write information in the attached information is temporarily stored in the write information memory 210, and the read information is temporarily stored in the read information memory 211 (S301).
302). These also include the target frame memory number. Here, the write information is immediately processed and becomes unnecessary if the writing is completed. However, the read information is used later and must be held until that time. Therefore, a plurality of pieces of read information that have not been processed may be held.

Next, the value of the offset memory 212 is added to the stored write memory number (S303). This value becomes the first candidate of the frame memory number as the storage destination of the image data. Here, the value of the offset memory is
In order to protect the contents of the frozen frame memory when the freeze operation is performed, this value is used to shift the frame memory number of the storage destination of the image data that is input one after another (accordingly, the freeze occurs once. If not, the value is 0), and the addition operation is performed modulo the number n of frame memories.

When the offset is added and the designated frame memory is frozen (S304-YES), the data cannot be written to the frame memory. Therefore, the write memory number in the write information memory 210 is returned to the value read from the attached information, 1 is added to the value in the offset memory 212 (S307), and the value is added again to the write memory number in the write information memory 210. (S30
3) Specify another frame memory.

If the designated frame memory is not frozen (S304-NO), the read information memory 2
11, the read memory number already stored in
Frame memory number (frame number for writing image data) obtained in steps S303, S304, and S307
(S305), and then a frame memory number for writing is set. This is the write memory number itself stored in the write information memory 210 at this time (S306). As a result, the image data is written to the designated frame memory.

On the other hand, the operation on the read side is as shown in FIG. First, it is determined whether there is a currently frozen frame memory (S311), and if so, the display state is held. If not, a read command to be processed is detected from the read information memory 211 (S3).
12). The read information is accompanied by information such as when, how, and from which memory. When a plurality of read commands are held, one read command is selected based on the read commands. If the read command is selected (S 312 -YES), it is read into the read command memory 213 including the accompanying information, and
The read memory number is also determined (S313 / S31)
4).

As a result, during the freeze, the read memory number in the read instruction memory 213 is not updated.
The frozen image data continues to be displayed. On the other hand, if there is no frozen image (including when the freeze is released), the image data of the number newly set in step S314 is read. By the above operation, when the freeze switch is on, the designated image data is continuously displayed. In addition, even during the freeze, the maximum and the latest (n-1) image data excluding the freeze target are: Since the image is stored in the frame memory without being restricted by the memory designation on the transmission side, the latest video can be displayed immediately after the freeze is released.

[0012]

However, in the above-mentioned conventional example, there is a problem that it is premised that n frames of memory store continuous n pieces of image data when displaying images. . That is, after the freeze is released, the frozen image data is stored in the frame memory f.
While the data remains at (0 = <f = <n-1), the data of the frame memory f, to which a part of the continuous image data is originally written, may be designated to be output. obtain. For example, if all of the image data except for the frozen frame memory are updated and the continuity of the n image data in the frame memory is lost, immediately after the freeze is released, (n-1) images Even if read information indicating that the previous image data is to be output is given, older data is present in the frame. For this reason, there is a problem that image data different from expected is output, and a displayed image may be disturbed.

More specifically, for example, when the number of frame memories is three, the immediately preceding image is superimposed on a part of the display screen of the latest image information immediately after the freeze is released. It is assumed that image processing such as superimposing the previous image is performed. In this case, if the previously transmitted and frozen video information remains in the frame memory in which the video information of the previous two frames should be written, the screen on which the video of the previous two images is superimposed is displayed. The screen is not originally intended, but is distorted.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional example. Even when image data that has been frozen and then unfrozen remains in the frame memory, the image data is not output. It is an object to provide a processing device.

[0015]

In order to achieve the above object, an image processing apparatus according to the present invention has the following arrangement. An image processing apparatus that stores input image data in a plurality of frame memories according to input control information and outputs the stored image data according to output control information,
It has a marking means for marking the variable-not output of the image data in each frame memory, and a control means for an indication by said indication means in preference to the output control information for controlling the output of the image data.

[0016]

According to the above arrangement, the frame memory in which the frozen image data remains remains in the frame memory after the freeze is released until the next image data is written to the frame memory and the contents are updated. It is possible to prevent image data from being read and displayed by mistake.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a flowchart in which the control by the memory control unit 205 of the image processing apparatus of the present embodiment shown in FIG. 2 is divided into a memory writing side and a memory reading side. FIG. 4 shows the conventional example shown in FIG. 2 in which only the memory control unit 205 is extracted and rewritten for the description of the present embodiment, and a freeze 214 corresponding to the frame memories 0 to (n-1) is shown. Flag 0
(N-1) has been added.

FIG. 1 shows writing of image data.
-1 will be described. When a write command for image data is detected (S101-YES), the write information in the attached information is stored in the write information memory 210 as in the conventional example.
Next, the read information is temporarily stored in the read information memory 211 (S102). Then, the value of the offset memory 212 is added to the stored write memory number (S1).
03). Here, the value of the offset memory 212 indicates the amount by which the designated memory number is shifted when the freeze operation is performed, and when the freeze has never occurred, the normal offset is used. Is 0. The addition is performed modulo n.

If the offset is added and the frame memory corresponding to the designated frame memory number is frozen (S104-YES), the freeze flag 214 corresponding to the frame memory is set (S105). This flag indicates that the video data that should have been written to the corresponding frame memory has not been written. Will be read out. Therefore,
When the freeze flag is set, disturbing the image can be prevented by prohibiting the reading of the corresponding frame memory. In other words, the freeze flag may be handled as a flag indicating that the corresponding frame memory is prohibited from being designated as a new read frame memory.

When the freeze flag 214 is set (S
105) In order to prohibit writing to the frame memory 204, the write memory number in the write information memory 210 is returned to the value originally read from the attached information, and 1 is added to the value in the offset memory 212 (S106).
The write memory number is updated again (S103). If the frame memory is not frozen (S104-
(NO), next, it is determined whether or not the freeze flag corresponding to the frame memory is set (S10).
7). If the flag is on (S107-YE
S) indicates that the frame memory is temporarily frozen, then the freeze is released, and thereafter, new data has not been written yet. In this case, since new data is to be written, it is necessary to reset the freeze flag (S108). After performing the reset process, the frame memory number in the read information of the frame being written in the read information memory 211 is changed (S109), and then the write memory number is set (S110).

As described above, the video data is written in the frame memory designated in step S110, and the flag information for inhibiting the frame memory from being set as a new read frame memory can be erased. On the other hand, the operation on the read side is shown in FIG.
The operation is as follows. As described in the conventional example, it is first determined whether or not there is a currently frozen frame memory (S111). If there is, the display state is held. If not, detection of a read command to be processed from the read information memory 211 is detected. Is performed (S112).

When a read command is detected (S112)
-YES), read information attached to the instruction is read into the read instruction memory 213 (S113).
Next, it is determined whether or not the freeze flag 214 corresponding to the target frame memory is set (S114). If the freeze flag 214 is set, the data in the frame memory is data that has been frozen in the past, is different from the data that should have been written, and the image may be distorted when displayed. In order to obtain, without displaying the frame memory,
The next read command is detected (S114-YES).

On the other hand, if the freeze flag 214 has not been set, the read memory number in the read command memory 213 read in step S113 is determined as a frame memory number for reading. (S11
5). Due to such an operation on the reading side, a new reading frame memory number is not set during the freeze, and the frozen video data is continuously displayed. On the other hand, if there is no video being frozen (including when the freeze is released), the video data in the frame memory newly designated in step S115 will be displayed, and the latest video will be displayed after the freeze is released. Even when the read information indicating that the video information (n-1) frames before the information is displayed is detected, the disturbed video is not displayed.

[0024]

As described above, the image processing apparatus according to the present invention does not output the image data even if the image data which has been frozen and then released remains in the frame memory. There is an effect that.

[Brief description of the drawings]

FIG. 1-1 is a part of a flowchart showing an embodiment of the present invention.

FIG. 1-2 is a part of a flowchart showing an embodiment of the present invention.

FIG. 2 is a block diagram of an image processing apparatus to which the present invention and a conventional example are applied.

FIG. 3-1 is a part of a flow chart showing a conventional example.

FIG. 3-2 is a part of a flow chart showing a conventional example.

FIG. 4 is a block diagram of a memory control unit of the image processing apparatus to which the present invention is applied.

Claims (3)

(57) [Claims] 1. An image processing apparatus for storing input image data in a plurality of frame memories in accordance with input control information and outputting the stored image data in accordance with output control information, the image data being stored in each frame memory. and marking means for marking the variable-not output, the image processing apparatus characterized by a control means for an indication by said indication means in preference to the output control information for controlling the output of the image data. 2. A designating means for designating one frame memory in order to keep outputting image data from an arbitrary one of the frame memories, and continuing to output image data designated by the designating means. further comprising a canceling means for canceling the state, stored while the image data from the frame memory designated are outputted by the specifying means, said control means the image data input to the frame memory in the output 2. The image processing apparatus according to claim 1, wherein the image processing apparatus performs control so as not to be performed. 3. The marking means , when the frame memory once designated by the designation means is canceled by the cancellation means, indicates that output is not possible, and the image data is written again in the frame memory whose designation has been canceled. 3. The image processing apparatus according to claim 2, wherein output is indicated at this time.