JPH0962856A - Picture editing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a picture editing device which can make a character written on a picture to be clear through the use of memories as few as possible. SOLUTION: The picture editing device stores JPEG compression data into a buffer memory 3, expands JPEG compression data and stores it in a frame memory 5. Character data generated in a character generation means 14 is written into the frame memory 5 and an area into which the character data is written is stored in a character area storage means 13. For eliminating written character data, JPEF compression data corresponding to the area stored in the character area storage means 13 is expanded from the buffer memory 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image editing apparatus for writing characters on an image. In particular, the present invention relates to an image editing device for writing characters on a high-definition still image.

[0002]

2. Description of the Related Art In an apparatus that edits a still image by adding character information, when an error is found in an input character, it is corrected by the following method. A buffer memory having the same size as the frame memory for storing the image is prepared, and the same image as the frame memory is stored in this buffer memory.

At the time of character input, the data of the input character is displayed on the writing screen in the frame memory and the information on the area of the written character is held. If an error is found in the displayed character, the image data in the buffer memory corresponding to that area is read and transferred to the corresponding area of the frame memory.

As a result, the written character data can be erased. Then, the corrected character is input again and stored in the frame memory. In addition, as another method, there is a method in which each time a character is written, the image data corresponding to the area is transferred to the buffer memory, and when there is a correction, the data in the buffer memory is transferred to the corresponding area of the frame memory. .

Even in this case, when the area for writing the characters extends over one screen, a buffer memory for one screen is eventually required.

[0006]

In the conventional method, a buffer memory for one screen must be prepared separately from the frame memory in order to correct characters. For example, when handling a full-color high-definition still image Is about 6 Mbytes (R
8 bits for each GB).

Therefore, when the image editing apparatus is realized by the above-mentioned method, there is a problem that the scale of hardware becomes large and the price of the apparatus also becomes expensive. Therefore, the present invention uses as little buffer memory as possible,
It is an object of the present invention to provide an image editing apparatus capable of adding information such as characters to an image.

[0008]

An image editing apparatus according to the present invention comprises a reproducing means (2) for reproducing compressed data from a recording medium (1) recording the compressed data, and a first memory for storing the reproduced compressed data. Means (3), decompression means (4) for decompressing the compressed data, second storage means (5) for storing the decompressed data, and characters for the decompressed data in the second storage means (5). Character generating means (14) for writing data, and the second storing means (5) for character data generated by the character generating means (14)
A character area storage means (13) for storing a storage area in the first storage means, and a compressed data corresponding to the storage area stored in the character area storage means (13) from the first storage means (3). It is composed of a control means (9) for controlling.

Further, in the image editing apparatus of the present invention, the compressed data is data compressed by the JPEG system, and the control means (9) expands the area partitioned by the restart marker code. Control. Further, in the image editing apparatus of the present invention, the compressed data is data compressed by the JPEG method, and the control means (9) includes a restart area including a storage area of the character data generated by the character generation means (14). Control to extend the smallest area partitioned by the marker code.

The image editing apparatus of the present invention further comprises a reproducing means (2) for reproducing the compressed data from a recording medium (1) recording the data compressed by the JPEG system, and a first storing the reproduced compressed data. Storage means (3), decompression means (4) for decompressing the compressed data, second storage means (5) for storing the decompressed data, and decompressed data in the second storage means (5). A character generation means (14) for writing character data,
The second of the character data generated by the character generation means (14)
Character area storage means for storing the storage area in the storage means (5)
(13), a storage area for storing the character data, and a third storage means (10) for storing data of a difference area between the minimum area divided by the restart marker code including this area, and the third storage means (10). 3 Control of data input / output to / from the storage means (10) and control for decompressing compressed data corresponding to the minimum area partitioned by the restart marker code from the first storage means (3) And a control means (9) for performing.

Further, in the image editing apparatus of the present invention, before the control means (9) expands the data corresponding to the minimum area partitioned by the restart marker code including the area of character data, The data of the difference area of the second storage means (5) is stored in the third storage means (10), and the data of the difference area stored in the third storage means (10) after the area is expanded is stored in the third storage means (10). 2 It is controlled to store in the original area of the storage means (5).

The image editing apparatus of the present invention further comprises a reproducing means (2) for reproducing the compressed data from the recording medium (1) recording the compressed data, and a first storing means (3) for storing the reproduced compressed data. Decompressing means (4) for decompressing the compressed data, second storage means (5) for storing the decompressed data, and character generation for writing character data in the decompressed data of the second storage means (5) Means (14), input means (8) for inputting a writing position of character data generated from the character generating means (14) with reference to a unit block of compression, and characters generated by the character generating means (14) Second storage means for data (5)
A character area storage means (13) for storing a storage area in the first storage means, and a compressed data corresponding to the storage area stored in the character area storage means (13) from the first storage means (3). And a control means (9) for controlling.

[Operation] In the image editing apparatus of the present invention, the compressed data is reproduced from the recording medium (1) in which the compressed data is recorded, and the reproduced compressed data is stored in the first storage means (3).
The compressed data stored in the first storage means (3) is expanded and stored in the second storage means (5), and the character data generated by the character generation means (14) is stored in the second storage means (5). Remember
The second of the character data generated by the character generation means (14)
The storage area in the storage means (5) is stored in the character area storage means (13), and the control means (9) stores the compressed data corresponding to the storage area stored in the character area storage means (13). First
It is controlled so as to be expanded from the storage means (3).

Further, in the image editing apparatus of the present invention, the control means (9) controls so as to expand the area partitioned by the restart marker code as a unit. Further, in the image editing apparatus of the present invention, the control means (9) extends the minimum area partitioned by the restart marker code including the storage area of the character data generated by the character generation means (14). Control.

Further, in the image editing apparatus of the present invention, JPEG
The compressed data is reproduced from the recording medium (1) in which the data compressed by the method is recorded, and the reproduced compressed data is stored in the first storage means (3) and stored in the first storage means (3). Decompress the compressed data stored in the second storage means (5),
Character data generated by the character generation means (14) is stored in the second storage means (5), and a storage area of the character data generated by the character generation means (14) in the second storage means (5) is stored. Data of a difference area stored in the character area storage means (13) and between the storage area of the character data and the minimum area divided by the restart marker code including this area is stored in the third storage means.
(10), the control means (9), the third storage means (10)
Control of data input / output to / from the first storage means (3) and decompression of compressed data corresponding to the minimum area divided by the restart marker code.

Further, in the image editing apparatus of the present invention, the control means (9) is configured to expand the data corresponding to a minimum area defined by a restart marker code including a character data area, before the data is expanded. The data of the difference area of the second storage means (5) is stored in the third storage means (10), and the data of the difference area stored in the third storage means (10) after the area is expanded is stored in the third storage means (10). 2 It is controlled to store in the original area of the storage means (5).

Further, the image editing apparatus of the present invention reproduces the compressed data from the recording medium (1) on which the compressed data is recorded, and stores the reproduced compressed data in the first storage means (3).
The compressed data stored in the storage means (3) is expanded and stored in the second storage means (5), and the character data generated by the character generation means (14) is stored in the second storage means (5) and compressed. The writing position of the character data generated from the character generating means (14) is inputted with reference to a unit block, and the second storing means (5) of the character data generated by the character generating means (14) is inputted.
Storing the storage area in the character area storage means (13), and the control means (9) stores the compressed data corresponding to the storage area stored in the character area storage means (13) in the first storage means (13). 3)
Control to extend from.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The first aspect of the present invention with reference to FIGS.
An embodiment will be described. First, the compressed data used in this image editing apparatus will be briefly described. This compressed data is JPEG (Joint Photographic).
It is compressed by the Expert Group method, and the compression algorithm is from P160 of the magazine "Interface December 1991" issued by CQ publisher.
Details are disclosed in P182.

In addition, decompressing the compressed data to reproduce an image is described in Japanese Patent Application No. 6-196693 and Japanese Patent Application No.
It has already been introduced in No. 203732. A number of codes called a restart marker code (hereinafter referred to as RST) can be inserted in the compressed data compressed by this compression method. This RST is used to reset the predicted value of the DC coefficient in the DCT transform, and thus it is possible to prevent the error propagation due to the transmission error of the compressed data.

That is, when a transmission error occurs in compressed data without RST, the error propagates to the entire image after the error occurs. But R
If ST is inserted in the compressed data, even if a transmission error occurs, the error propagation can be suppressed by the next RST. This indicates that the compressed data is delimited by the RST, and the blocks delimited by the RST become independent partial compressed data, which can be expanded independently.

Therefore, it is possible to partially decompress a part of the compressed data using this RST. Next, the first embodiment will be described. FIG. 1 is a diagram showing the functional blocks of this embodiment. In FIG. 1, the recording medium (1) is, for example, a hard disk or an optical disk. This recording medium
In (1), data obtained by compressing image data by the JPEG method is recorded. Further, the recording medium (1) has recorded therein all RST recording positions inserted in the compressed image data. That is, the position information indicating how many bytes from the beginning of the compressed image data the RST is recorded is
It is recorded in table format.

The reproducing means (2) is, for example, a hard disk drive or an optical disk drive, and reproduces the data on the recording medium (1). The buffer memory (3) is a recording medium (1)
It is a memory for storing the compressed data reproduced from. The decompression means (4) decompresses the data stored in the buffer memory (3). The decompression means (4) specifically performs processing such as inverse Huffman coding, inverse quantization, and inverse two-dimensional DCT transform.

The frame memory (5) stores the character data generated by the character generating means (14) together with the image data expanded by the expanding means (4). The D / A conversion means (6) converts the data stored in the frame memory (5) into an analog video signal. The display means (7) displays the signal output from the D / A conversion means (6).

The input means (8) is, for example, a keyboard or a mouse, and transmits the instruction of the operator to the control means (9). The control means (9) controls the entire apparatus of this embodiment. The block correction memory (10) is a memory for saving data in an error area between a character writing area and a JPEG compression block area, which will be described later.

The RST table storing means (11) is a reproducing means.
The RST table reproduced from (2) is stored. The decompression area designating means (12) uses the information of the character area stored in the character area storing means (13) described later and the RST table stored in the RST table storing means (11) to store the buffer memory (3 The area for partially expanding the compressed data stored in () is transmitted to the control means (9).

The character area storage means (13) is means for storing data representing a character area when the input character information is stored in the frame memory (5). For example, if two lines of a character string each having a size of 32 pixels vertically and 32 pixels horizontally and 5 characters in the horizontal direction are stored from a position of 100 pixels vertically and 100 pixels horizontally, the character area is 100 pixels vertically and From the position of 100 pixels, the area becomes 64 pixels in the vertical direction and 160 pixels in the horizontal direction.

The character generation means (14) generates character data corresponding to the character whose size and insertion position are designated by the input means, and overwrites the decompressed image in the frame memory (5). Next, the position of the RST inserted in the compressed data will be described. FIG. 2 is a conceptual diagram showing the insertion position of the RST inserted in the compressed data.

In JPEG, image data is divided into unit blocks of vertical 8 pixels × horizontal 8 pixels for compression processing. Therefore, the size of the image data is, for example, 1040 vertical pixels ×
If the horizontal size is 1920 pixels, the unit block is 1 in the vertical direction.
There are 31200 in total, 30 in total and 240 in the horizontal direction.

For these unit blocks, one block line (240) is processed in the horizontal direction from the upper left unit block in FIG. 2, and the processing line is lowered by one unit block. 1 block line is processed in the horizontal direction from the unit block. In this way JP
When the EG is compressed, the RST can be inserted after an arbitrary unit block. However, the compressed data in this embodiment is RS for each unit block as shown in FIG.
It is assumed that T is inserted and JPEG compressed.

Next, the operation of this device will be described.
FIG. 3 shows a flowchart showing the operation of this device. First, when the image to be read is designated by the input means (8), the control means (9) instructs the reproducing means (2) to read the compressed data of this image. The reproducing means (2) is a recording medium (1)
Reads the compressed data specified by the buffer memory
This is stored in (3) (step S1).

The control means (9) instructs the reproduction means (2) to read the RST table corresponding to this compressed data. The read RST table is stored in the RST table storage means (11) (step S2). on the other hand,
The compressed data stored in the buffer memory (3) is the decompression means.
After being decompressed by (4), it is stored in the frame memory (5).

Next, the operation of writing character information such as a title and commentary on this image will be described. First, the position and size of a character to be written are designated by the input means (8). Here, the size of a character is 100 pixels vertically and 100 pixels horizontally, and the display start position is 100 pixels vertically and 1 horizontally.
The position is 00 pixels.

The display start position may be entered by using the keyboard or by using the mouse. Alternatively, the number of characters to be input may be set in advance, a region in which the character data is written is displayed as a frame, and the frame may be moved and designated in the display screen. Next, from the input means (8),
When typed to display the word "title",
The control means (9) transmits these pieces of information to the character generation means (14).

The character generating means (14) is a frame memory (5).
The data corresponding to the input character is written in the predetermined position (step S3). At this time, the control means (9) stores in the character area storage means (13) information that the display start position of the character is 100 pixels vertically and 100 pixels horizontally and the size of the character area is 100 pixels vertically 400 pixels horizontally. To do.

Next, a method of erasing the character "title" written in the frame memory (5) when correcting the input character (step S4) will be described. Since the character area storage means (13) stores the area of the character data written in the frame memory (5), the corresponding portion of the compressed data stored in the buffer memory (3) is partially expanded. However, since the compressed data is compressed in block units of vertical 8 pixels × horizontal 8 pixels as described above, the following procedure is required.

First, the decompression area designating means (12) writes the information about the character area written in the frame memory (5) stored in the character area storing means (13) and the block interval (RST) The minimum area to be expanded is calculated by (vertical 8 pixels, horizontal 8 pixels) (step S5). That is, the square area including the “title” in FIG. 4 may be rewritten. Therefore, the rewriting area is obtained in units of vertical 8 pixels × horizontal 8 pixels. In the case of this example, an area of 104 pixels in the vertical direction (13 unit blocks) and 408 pixels in the horizontal direction (51 unit blocks) is surrounded by the thick line in FIG.

Since the shaded area in FIG. 4 is an area in which no character data is written, it is not necessary to erase the image in this area. Therefore, the control means (9) temporarily saves the data in the hatched area in the block correction memory (10). Therefore, for example, the hatched area is divided into areas (A) to (D) as shown in FIG. 4 and transferred to the block correction memory (10) (step S6).

Next, the control means (9) instructs the expansion means (4) to partially expand the area surrounded by the thick line. Specifically, the control means (9) has an RST table storage means (1
Based on the value of the RST table stored in 1), the number of bytes from the beginning of the compressed data in the area surrounded by the thick line is searched.

In this embodiment, the first unit block in the area surrounded by the thick line is the 2892th block of the entire compressed data. Since 51 unit blocks in the horizontal direction from the first unit block are present in the compressed data in a continuous state, the control means (9) instructs the decompression means (4) to collectively decompress them.

Next, since the head of the unit block on the second row in the area surrounded by the bold line is the 3132nd part of the entire compressed data, 51 unit blocks are collectively expanded from this. In this way, by expanding a block of 51 unit blocks in the horizontal direction about 13 times, the compressed data in the area surrounded by the thick line in FIG. 4 is expanded (step S7).

By the above operation, the area surrounded by the thick line returns to the original image data. Next, the control means (9) restores the data saved in the block correction memory (10) to the original area (step S8). By saving the data in the shaded area, even if a part of the character data written in another position overlaps this area, that part remains without being erased.

Then, the corrected character data input by the input means (8) is written again in the frame memory (5) (step S9), and the character correction is completed. In this embodiment, the example in which the character data is written at an arbitrary position and size is shown, but the character data may be written only at the position based on the compression unit block.

That is, the writing start position of the character data input by the input means (8) can be designated only in units of 8 pixels. This eliminates the need to save the data in the shaded area in FIG. 4 or to return the data to the original position. Furthermore, if the size of the character that can be specified is limited to a size that is a multiple of 8 pixels, the entire area of the image data can be used effectively and the character data can be written.

Further, in this embodiment, all the written characters are erased, but any character in the written characters may be erased and only that part of the characters may be corrected. Furthermore, by specifying the area you want to erase with the input means,
The character data in the area may be erased at once, or the entire screen may be returned to the image before editing. Further, in the description of this embodiment, the case where the character is added to the image is described, but it can be used when displaying the commentary of the image in the window.

That is, when there is an input from the input means (8) to display a commentary on the image being displayed, the control means (9) displays the commentary on the paint means (not shown). Is instructed to be painted in white or the like, and information representing the range of the painted area is stored in the character area storage means (13). Next, the control means (9) instructs the reproduction means (2) to read the commentary that is created in advance and recorded in the recording medium (1).

Then, the character information generating means (14) is instructed to write the character data corresponding to the read commentary in a predetermined position of the frame memory (5). Character generation means (1
In 4), the character data of the commentary is written in the frame memory (5) as shown in FIG. When there is an input from the input means (8) to end the display of the explanatory text, the compressed data corresponding to the area stored in the character area storage means (13) is
Partially decompress in the same manner as described above, and display of the explanatory text ends.

As a result, the commentary can be displayed in a window without having a dedicated memory. Also,
In this embodiment, the case where the compressed data and the RST table are recorded on the recording medium (1) has been described, but they may be recorded on different recording media. Further, the RST table may be created in advance and may not be recorded in the recording medium.

In this case, the compressed data is stored in the buffer memory.
After reading to (3), a table is created by checking the position where the RST is inserted. Further, in the above-mentioned example, the data compressed by the JPEG method has been described, but the present invention is not limited to this, and another compression method may be used.

[0049]

According to the present invention, the character data can be erased by expanding a part of the compressed data, so that the character can be edited with the buffer memory having a small capacity, and the cost of the apparatus can be reduced. Can be lowered. Further, according to the present invention, even if the data is compressed by the JPEG method, it can be partially expanded in units of the area partitioned by the restart marker code, so that the written character data can be erased. it can.

Further, according to the present invention, even if the area of the written character data and the minimum area of the data compressed by the JPEG method divided by the restart marker code are different, , Only the character data in the character data area can be erased.

[Brief description of drawings]

FIG. 1 is a functional block diagram of an embodiment of the present invention.

FIG. 2 is a diagram showing an example of the position of an RST inserted in compressed data in this embodiment.

FIG. 3 is a flowchart showing the operation of this embodiment.

FIG. 4 is a diagram showing an example of a character area and a decompression area in this embodiment.

FIG. 5 is a diagram for explaining an example of display of commentary text in this embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Recording medium, 2 ... Reproducing means, 3 ... Buffer memory (first storage means), 4 ... Decompression means, 5 ... Frame memory (second storage means), ...・ D / A conversion means, 7 ... Display means, 8 ... Input means, 9 ... Control means, 10 ... Block correction memory (third storage means), 11 ... RST table storage means, 12 .. Decompression area designating means, 13. Character area storing means, 14. Character generating means

Claims (6)

[Claims] 1. A reproducing means (2) for reproducing the compressed data from a recording medium (1) recording the compressed data, a first storing means (3) for storing the reproduced compressed data, and the compressed data. Decompressing means (4) for decompressing, second memory means (5) for storing the decompressed data, and character generating means (14) for writing character data to the decompressed data of the second memory means (5) The second of the character data generated by the character generation means (14)
Character area storage means for storing the storage area in the storage means (5)
(13), and control means (9) for performing control for expanding the compressed data corresponding to the storage area stored in the character area storage means (13) from the first storage means (3) An image editing device characterized by the above. 2. The compressed data is data compressed by the JPEG system, and the control means (9) controls so as to decompress the area divided by the restart marker code as a unit. The image editing apparatus according to claim 1. 3. The compressed data is data compressed by the JPEG method, and the control means (9) includes a restart marker including a storage area of the character data generated by the character generation means (14). The image editing apparatus according to claim 2, wherein the image editing apparatus is controlled so as to extend the minimum area partitioned by the code. 4. A reproducing means for reproducing the compressed data from a recording medium (1) in which the data compressed by the JPEG system is recorded.
(2) and first storage means (3) for storing the reproduced compressed data
A decompression means (4) for decompressing the compressed data, a second storage means (5) for storing the decompressed data, and a character for writing character data into the decompressed data of the second storage means (5). Generating means (14) and the second of the character data generated by the character generating means (14)
Character area storage means for storing the storage area in the storage means (5)
(13), a storage area for storing the character data, and a third storage means (10) for storing data of a difference area between the area including the area and a minimum area divided by a restart marker code, 3 Control of data input / output to / from the storage means (10) and control for decompressing compressed data corresponding to the minimum area partitioned by the restart marker code from the first storage means (3) An image editing apparatus comprising: a control means (9) for performing the above. 5. The second storage means (5) before the control means (9) decompresses data corresponding to a minimum area divided by a restart marker code including an area of character data. Data of the difference area of the third storage means (1) is stored in the third storage means (10), and the area is further expanded.
The data of the difference area stored in 0) is stored in the second storage means (5).
5. The image editing apparatus according to claim 4, wherein the image editing apparatus is controlled so as to be stored in the original area of. 6. A reproducing means (2) for reproducing the compressed data from a recording medium (1) recording the compressed data, a first storing means (3) for storing the reproduced compressed data, and expanding the compressed data. Decompressing means (4), second memory means (5) for storing the decompressed data, character generating means (14) for writing character data to the decompressed data of the second memory means (5), The character generation means (14) with reference to a unit block of compression
Inputting means (8) for inputting a writing position of the character data generated from the character data generating means, and the second of the character data generated by the character generating means (14).
Character area storage means for storing the storage area in the storage means (5)
(13), and control means (9) for performing control for expanding the compressed data corresponding to the storage area stored in the character area storage means (13) from the first storage means (3) An image editing device characterized by the above.