JP2000032341A - Device and method for generating key frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate a key frame capable of easily changing a color or setting display time to a character string composed of a telop. SOLUTION: A CPU 5 stores the sentence of a sentence memory 3 in a comparative memory 5a, generates a color code as a parameter from respective words composing of the relevant sentence based on a word conversion table stored in a word conversion table memory 4 and further generates time to perform color display as well. Namely, concerning the respective words composing of the character string to be inputted, it is retrieved in order whether the word is existent on the word conversion table or not and color information and time information related to the retrieved word existent on the word conversion table are read out of a storage means. Based on the read color information and time information, the key frame is generated. Thus, coloring is performed to the character composing of the relevant character string according to the inputted character string and the time information for displaying that character can be provided as well.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key frame generating apparatus and a key frame generating method for supplying a key frame to an editing apparatus for editing a plurality of input images in accordance with a key frame indicating execution contents of an output image. .

[0002]

2. Description of the Related Art Conventionally, an editing apparatus that edits a plurality of input images by applying special effects such as enlargement, reduction, rotation, etc., performs image editing by executing key frames. Here, the key frame is composed of data (hereinafter, referred to as “effect data”) at each moment of an image that changes with the passage of time, that is, a set of data per predetermined time constituting the image. The edited image is formed as a continuous image by interpolating a plurality of images based on the effect data between the key frames.

The editing apparatus displays a timeline on an operation monitor screen so that key frames respectively corresponding to a plurality of input images can be easily and visually managed. The user can easily change the special effects of a plurality of input images, the timing of combination, etc. by operating a key frame displayed on the operation monitor with a mouse or the like or changing the contents of the key frame by keyboard input. And can be added.

[0004]

Each key frame constituting the time line has data relating to the execution time of special reproduction and the time of synthesis with another image. Therefore, the user needs to determine the time and numerical value for each key frame before creating the key frame.

Here, a procedure for creating a key frame will be described with reference to an example in which a telop is flowed in a certain screen.

When a user creates a telop whose character color changes depending on the content, it is necessary to create a timeline for displaying the telop characters and another timeline. The user creates a key frame by designating an appropriate time while watching the telop flowing in this timeline. Next, a color suitable for the content of the telop is set in this key frame. Complete by setting colors for all necessary keyframes.

[0007] According to such a procedure, two types of work are required, a work of creating a character string of a telop and a work of forming a timeline for changing a color according to the flow of the telop, which is extremely inconvenient for the user. Was.

The present invention has been proposed in view of such circumstances, and generates a key frame for easily changing a color of a character string constituting a telop or setting a display time. An object of the present invention is to provide a key frame generation device and a key frame generation method.

[0009]

In order to solve the above-mentioned problems, a key frame generating apparatus according to the present invention comprises: a key frame generating apparatus for generating a key frame indicating execution contents of an output image; Storage means for storing a word conversion table composed of color information and time information respectively associated with each word, and search means for sequentially searching each word constituting the input character string to see if it is in the word conversion table Reading the color information and the time information associated with the word found in the word conversion table by the search means from the storage means, and generating a key frame based on the read color information and the time information. Key frame generating means.

[0010] A key frame generating method according to the present invention is a key frame generating method for generating a key frame indicating execution contents of an output image, comprising a plurality of words, color information and time information respectively associated with each word. The word conversion table is stored, and each word constituting the input character string is searched in order to determine whether the word is in the word conversion table. The color information and time associated with the searched word are found in the word conversion table. Information is read from the storage means, and a key frame is generated based on the read color information and time information.

A key frame generation apparatus according to the present invention is a key frame generation apparatus for generating a key frame indicating execution contents of an output image, wherein the input character string is decomposed into predetermined units to obtain a character string. And converting each of the decomposed character strings into bitmap data to calculate the number of pixels, and calculating the display time of each character string based on the calculated number of pixels to obtain a key frame of each character string. Computing means.

A key frame generating method according to the present invention is a key frame generating method for generating a key frame indicating execution contents of an output image, wherein a character string is generated by decomposing an input character string into predetermined units. Each of the decomposed character strings is converted into bitmap data to calculate the number of pixels,
A key frame of each character string is generated by calculating a display time of each character string based on the calculated number of pixels.

According to the key frame generation device of the present invention, in a key frame generation device for generating a key frame indicating execution contents of an output image, character information indicating a character size and character information of the character are included in an input character string. Embedding means for embedding a control code including color information specifying a color to obtain a key frame is provided.

According to the key frame generation method of the present invention, in the key frame generation method for generating a key frame indicating execution contents of an output image, the input character string includes character information indicating a character size and character information of the character. A key frame is generated by embedding a control code including color information specifying a color.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First to third embodiments of the present invention will be described below with reference to the drawings.
The present invention provides, for example, a character information conversion device 1 having a configuration shown in FIG.
Applied to

The character information converter 1 is, for example, a graphic user interface (Graphic User Int).
erface: Hereinafter referred to as “GUI”. ), A sentence memory 3 for storing a sentence from the input unit 2, a word conversion table memory 4 for storing a word conversion table, and calculation of parameters and the like. CPU 5 to perform;
A key frame memory 6 for storing key frames. Then, the key frames stored in the key frame memory 6 are supplied to the image effect device 7.

Here, the image effect device 7 edits an image by executing the contents of a key frame, and edits an image by applying a special effect such as enlargement / reduction / rotation to a plurality of input images. Is output. A key frame is made up of data at each moment of an image that changes with the passage of time, that is, a set of data per predetermined time that constitutes the image. The present invention is to easily generate a key frame for displaying a telop with information about a key frame such as a color.

The input unit 2 comprises, for example, a keyboard, a so-called touch panel, and a pointing device. The user creates a sentence by inputting a sentence by a key input operation or pointing to a predetermined place on the GUI. Then, the input unit 2 writes the created sentence in the sentence memory 3. The input unit 2 may write a sentence input from the outside into the sentence memory 3.

It is assumed that the following sentence (1) has been written in the sentence memory 3. "The long winter has come to an end, and the number of warm days has gradually increased. The crows on the mountain have also taken off their hot black cloaks and have fallen in love with white seagulls. The flying figure will look beautiful. "
... (1)

The word conversion table memory 4 stores a word conversion table, and is a memory for converting words in a sentence into predetermined parameters and the like. The word conversion table includes a plurality of words and parameters and time information related to each word. In the present embodiment, the word conversion table includes a “word”, a “color” related to the word, a “color code” indicating the color, and “time information”.
It is assumed to be composed of

The CPU 5 includes a comparison memory 5a, reads a sentence from the sentence memory 3, and writes the sentence to the comparison memory 5a. The CPU 5 compares the word stored in the comparison memory 5 a with the word stored in the word conversion table memory 4, and when there is a matching word, reads out a parameter or the like corresponding to the word from the word conversion table memory 4. , And these parameters are written in the key frame memory 6.

More specifically, the CPU 5 executes the processing from step ST1 shown in FIG. 2 to perform the above-described processing.

In step ST1, the CPU 5 initializes a character pointer and proceeds to step ST2. Here, the character pointer indicates a character position to be processed in order to process characters from the beginning to the end of the text stored in the text memory 3. Therefore, to initialize the character pointer means to set the character pointer to 0, that is, to set the character to be processed to the beginning of the text stored in the text memory 3.

In step ST2, the CPU 5 initializes the comparison memory 5a and proceeds to step ST3. That is, the CPU 5 sets no characters to be compared.

In step ST3, the CPU 5 reads one character from the text memory 3 and writes it in the comparison memory 5a, and proceeds to step ST4. Although only one character is read here, the sentence in the sentence memory 3 may be divided into words and read one word at a time.

In step ST4, the CPU 5 determines whether or not the comparison memory 5a has become excessive. When it is determined that the comparison memory 5a has become excessive, the CPU 5 proceeds to step ST12. Here, the CPU 5 operates the comparison memory 5 by adding characters.
Determine whether the sentence stored in a exceeds a predetermined number of characters,
If the number of characters exceeds a predetermined number, there is no word that matches the word in the word conversion table memory 4, and the comparison is stopped.

In step ST5, the CPU 5 initializes a pointer in the word conversion table memory 4 (hereinafter, referred to as "word conversion table pointer"), and proceeds to step ST6.
Proceed to. By initializing the word conversion table pointer, it is set so that the comparison process is performed from the first word in the word conversion table memory 4.

In step ST6, the CPU 5 compares the characters stored in the comparison memory 5a with the words in the word conversion table memory 4, and proceeds to step ST7.

In step ST7, the CPU 5 determines whether the character stored in the comparison memory 5a matches a word in the word conversion table memory 4, and if so, proceeds to step ST10, and determines that it does not match. If so, the process proceeds to step ST8. For example, the CPU 5 determines that the word “long” is not included in the word in the word conversion table memory 4 and proceeds to step ST8, and the word “winter” is in the word conversion table memory 4. And step S
Proceed to T10.

In step ST8, the CPU 5 increments the word conversion table pointer of the word conversion table memory 4 and proceeds to step ST9. That is, the CPU 5
Since the word in the comparison memory 5a does not match any word in the word conversion table, another word is to be compared.

In step ST9, the CPU 5 determines whether or not the pointer in the word conversion table memory 4 has reached the end point.
Returning to T2, if it is determined that the end point has not been reached, the process proceeds to step ST6. That is, by repeatedly performing the processing from step ST6 to step ST8, it is searched whether or not the word in the comparison memory 5a is in the word conversion table. If not, the process returns to step ST2 to return another word from the sentence memory 3. Is read and the process is executed.

In step ST10, the CPU 5
The parameter and time information for the word whose character pointer matches the word conversion table pointer are calculated, and the process proceeds to step ST11.

For example, when the CPU 5 finds the word “winter” from the word conversion table in the word conversion table memory 4 when a predetermined word (for example, “winter”) is written in the comparison memory 5a, As shown, “color”, “number of characters”, “color code” as a parameter, and “time” as time information are calculated. “Color” indicates a color for coloring the word “winter”. The “number of characters” indicates the number of the character from the beginning of the input sentence. Here, the word "winter" is the third. The “color code” is a code of the “color”, and specifies a color based on signal levels of red, green, and blue. “Time” is a value obtained by multiplying the number of characters by a predetermined coefficient (for example, one minute for three characters).

At step ST11, the CPU 5
A parameter key frame is created at the time position indicated by the time information, and the process proceeds to step ST12.

In step ST12, the CPU 5
The character pointer in the sentence memory 3 is incremented,
It proceeds to step ST13. That is, since the processing of the word has been completed, the CPU 5 sets the next word as a processing target.

In step ST13, the CPU 5
It is determined whether the character pointer of the text memory 3 has reached the end of the stored text. If it is determined that the text pointer has reached the end, the process ends. If it is determined that the text pointer has not reached the end, the process returns to step ST2.

The CPU 5 executes step ST1 as described above.
By performing the processing of step ST12, as shown in FIG. 3, a word in the word conversion table is extracted, a character code, time, and the like relating to the word are obtained, and a key frame is generated. 6 is supplied to the image effect device 7.

Thus, the image effect device 7 displays the sentence (1) when displaying the telop, and displays the word “winter” in white one second after the start of display according to the table shown in FIG. Then, "warm" is displayed in pink three seconds after the start of display, and "crow" is displayed 10 seconds after the start of display.
The text (1) serving as a telop is edited so as to be displayed after 20 frames per second (10 seconds and 20 frame times).

As described above, the character information conversion apparatus 1 can generate a color code as a parameter from each word constituting the sentence (1), and can also generate a time for performing color display, and can provide an image effect. A key frame optimal for use in the device 7 can be generated.

In the above-described embodiment, an example has been described in which a parameter or a time, which is a color code, is obtained using a word conversion table. However, the present invention is not limited to this. For example, a parameter or time may be generated by calculating a character code of an input character by a predetermined function, or a parameter or time may be generated by converting the character code using a predetermined conversion table.

The word conversion table memory 4 may store a word conversion table for converting each word into a phonetic symbol instead of the above-described word conversion table. At this time, C
The PU 5 may convert each word into a phonetic symbol according to the word conversion table in the word conversion table memory 4. For example, C
When the sentence “I'm very happy.” Is input, the PU 5 converts the sentence into a phonetic symbol string based on the sentence as shown in FIG. 4, for example, and calculates a timeline numerical value from this. Then, based on the calculated timeline numerical value, the image effect device 7 can edit so that the telop is flashed at the accent position of the phonetic symbol.

The parameters may be controlled by a character string written in a key frame. For example, FIG.
As shown in (1), the operation of the parameter is described in words at the position of the key frame. In key frame 1, "u
p ”, the parameter rises. In the key frame 2, since it is "down", the parameter is lowered. In the key frame 3, since it is “top”, the parameter has the maximum value. In key frame 4, the parameter has the minimum value because it is "bottom". In keyframe 5, since it is "charm", the parameters change attractively. At keyframe 6,
Being "strange", the parameters change strangely.

At this time, the characters constituting the telop are light in key frame 1, dark in key frame 2, and pure white in key frame 3. In key frame 4, for example, the color changes like a rainbow,
At key frame 4, strange colors come and go.

Next, a second embodiment of the present invention will be described. In the second embodiment, a character string is divided and a key frame is automatically created based on “,” “.”, A line feed, or the like in a sentence (character string). In the present embodiment, the character information conversion device 1 has the same configuration as that shown in the first embodiment, and a detailed description will be omitted. Note that the word conversion table memory 4 is not used.

Here, it is assumed that the following text (2) is input to the text memory 3. "Italy
The northern Dolomite region is located on the southern slope of the Alps Mountains.
Subzero temperatures (sometimes -21 ° C) continue during the winter, but sunny weather is high, sometimes reaching 85% in some years.・ ・ ・ ・ ・ ・ （２）

The CPU 5 reads the sentence (2) from the sentence memory 3.
Is read out, stored in the comparison memory 5a, and ",""."
And a line feed, etc., are detected, and processing for dividing the sentence (2) is executed. As a result, the sentence (2) is divided as follows.

[Dolomite, north of Italy, is located on the southern slope of the Alps Mountains. During winter, temperatures below freezing (sometimes-
21 ℃), but the sunny weather rate is high, and 8
Sometimes it was 5%. "(3)

The CPU 5 develops the divided character string into a bitmap according to the font of each character constituting the character string, and calculates the total number of pixels of the character string. For example, sentence (3)
Are 137, 175, 276, 70, and 261 in order from the first row.

When the calculation of the number of pixels is completed, the CPU 5 calculates the time based on the number of pixels. When scrolling the text (2), the time for each line can be obtained by multiplying the number of pixels of the horizontal width by a coefficient. Here, in the case of a telop in which one pixel character moves per frame, the time required for the character string of each line of the sentence (3) to move the width of the own character string is 4 seconds and 17 frames in order from the first line. , 5 seconds 25 frames, 9 seconds 06 frames, 2 seconds 10 frames, and 8 seconds 21 frames.

The CPU 5 calculates a key frame time based on the calculated time, creates a key frame using the corresponding character string as a parameter, and writes the key frame in the key frame memory 6. As shown in FIG. 6, the information on the key frame created by the CPU 5 includes “number”, “interval”, “time”, “position”, and “content”. “Number” indicates the order of display here. “Interval” indicates the time during which the divided text is displayed. “Time” indicates the display start time of the divided text. That is, it is the time from the start of the telop until the text is displayed. “Position” indicates the vertical position of the divided text. Specifically, for example, it indicates the number of pixels from the upper end of the display. The display screen of the display on which the edited image is displayed is 720 × 480.
It shall consist of dots. At this time, the upper left corner is (0,
0), the upper right corner is (720,0), the lower left corner is (0,480), and the lower right corner is (720,480). Thus, according to FIG.
Each row has a different vertical display position. "Content" indicates each line of the divided text.

As shown in FIG. 7, the image effect device 7 generates a desired image by synthesizing the image shown below and the first to fifth layers. Here, it is assumed that the fourth layer is a character layer, and the other layers are images and the like. The image effect device 7 creates a bitmap from the font information of the sentence (2) based on the key frame from the key frame memory 6.

Then, as shown in FIG. 7, the image effect device 7 combines the layers, sets the character layer as the fourth layer, and then sets the initial position and the scroll speed. Here, it is set in advance that one pixel moves in one frame.

The image effect device 7 can synthesize an image that moves by one pixel per frame with respect to the fourth layer, and can display a telop as shown in FIG. 8 on a monitor (not shown). That is, the character information conversion device 1
Can easily generate a key frame including a parameter for displaying a telop suitable for the image effect device 7 from a character string.

Next, a third embodiment of the present invention will be described. The present invention generates a key frame by embedding a control code in an input sentence, and is applicable to the character information conversion device 1 described in the second embodiment.

Here, it is assumed that a sentence (4) shown below is input to the sentence memory 3.

"XXXX at the 1998 Winter Olympics
Athletes won the mogul competition at Iizuna Kogen Ski Resort, defeating the average powerhouse. The tricks he showed in the final were Twister and Spread Eagle on Air 1 and Kozak on Air 2. (4)

Here, the control code will be described. As shown in FIG. 9, the control codes are “size” and “colo”.
r "," wait ", and" vector ". For example, [size 1
[5] means that the character size of the character string is set to 15. As the number increases, the size of the character increases, and as the number decreases, the size of the character decreases. [Color 128, 128, 255] means that the color of the character in the character string is blue. These three numbers are from 0 to 25
Each signal level in the red signal, green signal, and blue signal having signal levels up to 5 is shown. Thus, for example, [co
lor 0,0,0] means that the characters will be white and [color 2
55,255,255] means that the characters will be black. [Wait
10:00] means opening characters for 10 seconds.
[Vector 2.00, 3.00] is a so-called motion vector, which sets the number of pixels by which the character string moves for each frame. "2.00" indicates the speed of vertical movement from top to bottom of the screen, and "3.00" indicates the speed of horizontal movement from left to right of the screen. Therefore, as these numbers increase, the movement of the characters increases.

The CPU 5 executes a process of embedding a control code into the text (4) as shown in FIG. 10 in response to an operation of an operation unit (not shown), thereby generating a key frame shown in FIG. The key frame is written into the key frame memory 6.

The image effect device 7 generates an image composed of telops displayed as follows in accordance with such a key frame.

"The XXXX at the 1998 Winter Olympics
The player has a character size of 12 and is a white character. Further, as shown in FIG. 12, the display unit appears at the position of (720, 200) on the display screen and moves (scrolls) to the left at the speed of one dot per frame. According to FIG. 12, since 14 characters are on the screen,
This is when 18 frames per second have elapsed.

The part of "Iizuna Kogen" has a character size of 2
4, which is twice as large as other characters, as shown in FIG. Its moving speed is the same as the characters before and after it. The color of this character is sky blue.

The "winning" part is as shown in FIG.
It appears from the position (720,400) on the display screen and is lower than the position where other characters appear. Further, since the moving speed is 2 dots per frame in the left direction, the character moves so as to overtake characters already appearing on the screen.

The “Kozak” part appears from the position (300,480) as shown in FIG. That is, it appears from the lower center. Also, since the motion vector is (0, -1), it does not move in the horizontal direction but moves vertically upward.

That is, the character information conversion device 1 can easily generate a key frame for setting a character color and a movement suitable for the image effect device 7 in accordance with a character string to be input. .

[0065]

As described above in detail, according to the key frame generating apparatus and the key frame generating method of the present invention, each word constituting the input character string is determined in order in the word conversion table. The color information and the time information associated with the word searched for and found in the word conversion table are read from the storage unit, and the key frame is generated based on the read color information and the time information, thereby being input. In addition, the characters constituting the character string can be colored according to the character string, and time information for displaying the character can be obtained.

According to the key frame generation apparatus and the key frame generation method of the present invention, a character string is generated by decomposing an input character string into predetermined units, and each decomposed character string is converted into bitmap data. Convert and calculate the number of pixels,
By calculating the display time of each character string based on the calculated number of pixels, the input character string can be easily displayed by changing the display time for each predetermined unit.

According to the key frame generating apparatus and the key frame generating method of the present invention, a control code including character information indicating the size of a character and color information designating the color of the character is included in the input character string. By generating a key frame by embedding, the size and color of the character can be changed for each character string in which the control code is embedded, and the character string can be easily displayed.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a character information conversion device to which the present invention has been applied.

FIG. 2 is a flowchart illustrating an operation of a CPU of the character information conversion device.

FIG. 3 is a diagram illustrating words extracted by a word conversion table, their color codes, and times.

FIG. 4 is a diagram illustrating that an input character string is converted into a numerical value according to phonetic symbols in a word conversion table.

FIG. 5 is a diagram illustrating a change in a parameter when a parameter operation is described at a position of a key frame.

FIG. 6 is a diagram illustrating a key frame created by decomposing an input sentence according to punctuation marks.

FIG. 7 is a diagram illustrating a multi-layer structure for generating a composite image.

FIG. 8 is a diagram showing an example of a telop displayed on a monitor.

FIG. 9 is a diagram illustrating the contents of a control code.

FIG. 10 is a diagram illustrating a state when a control code is embedded in a sentence.

FIG. 11 is a diagram illustrating a key frame created by the control code.

FIG. 12 is a diagram illustrating a state in which a character string is displayed as a telop according to the control code.

FIG. 13 is a diagram illustrating a state in which a character string is displayed as a telop according to the control code.

FIG. 14 is a diagram illustrating a state in which a character string is displayed as a telop according to the control code.

FIG. 15 is a diagram illustrating a state where a character string is displayed as a telop according to the control code.

[Explanation of symbols]

1 character information conversion device, 2 input section, 3 sentence memory,
4 Word conversion table memory, 5 CPU, 6 key frame memory, 7 image effect device

Claims (14)

[Claims] 1. A key frame generating apparatus for generating a key frame indicating execution contents of an output image, wherein a storage unit stores a word conversion table including a plurality of words, color information associated with each word, and time information. Search means for sequentially searching each word constituting the input character string for the word in the word conversion table; and color information associated with the word searched for in the word conversion table by the search means. And a key frame generating unit that reads key information and time information from the storage unit and generates a key frame based on the read color information and time information. 2. The key frame generating means, based on a position in the input character string of a word searched for in the word conversion table by the search means, and time information read from the storage means. 2. The key frame generating apparatus according to claim 1, wherein the key frame including time information indicating a time for displaying the word is generated. 3. The storage means stores a word conversion table comprising a plurality of words and accent information indicating the accent of each word. The key frame generation means determines that the key frame generation means is in the word conversion table by the search means. 2. The key according to claim 1, further comprising: reading out the accent information of the searched word from the storage unit; and generating a key frame including information for flashing the word or changing a display position based on the accent information. Frame generation device. 4. A key frame generation method for generating a key frame indicating execution contents of an output image, comprising: storing a word conversion table including a plurality of words and color information and time information respectively associated with each word; The words constituting the character string to be searched are sequentially searched for in the word conversion table, and the color information and the time information associated with the searched word in the word conversion table are read out from the storage means. A key frame generating method based on the read color information and the time information. 5. A time indicating a time for displaying the word based on the position of the word searched for in the word conversion table on the input character string and the time information read from the storage means. 5. The key frame generation method according to claim 4, wherein a key frame including information is generated. 6. A word conversion table comprising the plurality of words and accent information indicating an accent of each word is stored. Accent information of a word searched for in the word conversion table is read, and based on the accent information. 5. The key frame generation method according to claim 4, wherein a key frame including information for flashing the word or changing a display position is generated. 7. A key frame generating apparatus for generating a key frame indicating execution contents of an output image, comprising: a decomposing means for decomposing an input character string into predetermined units to obtain a character string; A calculating means for converting a column into bitmap data to calculate the number of pixels, and calculating a display time of each character string based on the calculated number of pixels to obtain a key frame of each character string. apparatus. 8. The apparatus according to claim 7, wherein said calculating means generates a key frame including position information indicating a display position of each character string in accordance with the order of each character string obtained by said decomposing means. Key frame generator. 9. A key frame generation method for generating a key frame indicating execution contents of an output image, wherein a character string is generated by decomposing an input character string into predetermined units, and each of the decomposed character strings is generated. A key frame generation method, wherein the key frame of each character string is generated by converting the pixel number into bitmap data, calculating the number of pixels, and calculating the display time of each character string based on the calculated number of pixels. . 10. The key frame generation method according to claim 9, wherein a key frame including position information indicating a display position of each character string is generated in accordance with the order of each of the decomposed character strings. 11. A key frame generation device for generating a key frame indicating execution contents of an output image, wherein a character string to be input includes character information indicating a character size and color information specifying a color of the character. A key frame generation device comprising an embedding means for obtaining a key frame by embedding a control code. 12. The key frame generating apparatus according to claim 11, wherein said embedding means generates a key frame by embedding control data including motion information for moving the character string. 13. A key frame generation method for generating a key frame indicating the execution contents of an output image, wherein an input character string includes character information indicating a character size and color information specifying a color of the character. And generating a key frame by embedding a control code. 14. The key frame generation method according to claim 13, wherein control data including motion information for moving the character string is embedded to generate a key frame.