KR20090008732A

KR20090008732A - Apparatus for synthesizing image of digital image instrument and method using the same

Info

Publication number: KR20090008732A
Application number: KR1020070071918A
Authority: KR
Inventors: 이권주; 이승신; 한영란
Original assignee: 삼성전자주식회사
Priority date: 2007-07-18
Filing date: 2007-07-18
Publication date: 2009-01-22

Abstract

An apparatus for synthesizing images of a digital image apparatus and a method thereof are provided to include a configuration element for image synthesizing in addition to a CPU(Central Processing Unit) and a memory, thereby performing stable image synthesizing with high performance. A frame buffer(202) buffers the first input image(205) according to each frame. A synthesizing area determining unit(203) determines a synthesizing area by using image data in which the first input image is scanned. An image synthesizing unit(204) synthesizes the determined synthesizing area with the second input image(206) set as a background by a control signal(207) for determining an image synthesizing method.

Description

Image synthesizing apparatus of digital imaging equipment and image synthesizing method using same {APPARATUS FOR SYNTHESIZING IMAGE OF DIGITAL IMAGE INSTRUMENT AND METHOD USING THE SAME}

The present invention relates to an apparatus and a method for synthesizing two input images, and more particularly, to an image synthesizing apparatus and method capable of independently implementing various synthesis methods.

Recently, as many users make their own images, the necessity of image synthesis and editing also increases. For example, an increasing number of users upload user-generated content (UCC) edited videos to portal sites, community sites, and personal blogs.

In particular, with the development of wireless communication networks, the act of collecting images using portable video devices such as mobile phones, PMPs, PDAs, DMB receivers, etc. is increasingly recognized as a general act. However, users cannot edit images collected by the portable video device itself, and use a separate video device or a PC.

High performance systems are needed to smoothly perform image synthesis and editing. In the case of a general CPU that performs image processing in the form of Fetch-Decode-Excute, there is considerable overhead for smooth video compositing. On the other hand, when the broadcasting equipment is purchased for high quality video synthesis, the performance is excellent but the cost burden is increased.

The portable video device stores image data for each frame in a memory in which the CPU is built-in, and edits the stored two image data. In particular, in a portable terminal such as a mobile phone, the CPU performs all processing related to the image and sound of the system. Therefore, synthesizing the video and the video through the memory and the CPU, etc. inside the portable terminal will severely overload the portable device as a whole, and power consumption is inevitably increased.

As a result, the portable device synthesizes images using a CPU or a memory mounted therein, which is disadvantageous in terms of system resource utilization. In addition, many failures occur when the portable device performs other applications. Therefore, portable devices can only implement extremely limited image synthesis, and are inferior in performance and system resource utilization as compared with synthesis circuits implemented in ASICs.

Therefore, there is an urgent need for an independent apparatus and method for implementing image synthesis through an all-in-one chip that consumes low power and exhibits high performance.

The present invention provides a video synthesizing apparatus and method for digital video apparatuses capable of performing stable and high-performance image synthesizing by providing components separately from a CPU and a memory embedded in a portable video apparatus.

The present invention provides an image synthesizing apparatus and method of a digital imaging apparatus capable of managing resources more efficiently by implementing all components for image synthesizing with a low power small IC (ASIC).

The present invention provides an image synthesizing apparatus and method of a digital imaging apparatus capable of generating and outputting a variety of synthetic images by implementing various synthesis methods and easily designating a substitute image.

The present invention provides an image synthesizing apparatus and method for a digital imaging apparatus that can reduce manufacturing costs by simply synthesizing two inputted images without using a complicated application processor.

An image synthesizing apparatus of a digital imaging apparatus according to an embodiment of the present invention includes a frame buffer for buffering a first input image for each frame, and a synthesis region determination unit for determining a synthesis region using image data scanned from the first input image. And an image synthesizing unit synthesizing the determined synthesis region with a second input image set in the background by a control signal for determining an image synthesizing method.

At this time, the synthesis region determiner is an image scanning unit for scanning the buffered first input image to collect the image data of the first input image, HSV conversion unit for converting the HSV data using the collected image data; The apparatus may include a synthesis region selector configured to select a synthesis region in the first input image by using the converted HSV data.

An image synthesis method of a digital imaging apparatus according to an embodiment of the present invention includes buffering a first input image frame by frame, determining a synthesis region using image data scanned from the first input image, and image synthesis method. And synthesizing the determined synthesis region with the second input image set in the background by a control signal for determining a function.

In this case, the determining of the synthesis region may include scanning the buffered first input image to collect image data of the first input image, converting the image into HSV data using the collected image data, and The method may include selecting a synthesis region from the first input image by using the converted HSV data.

In this case, selecting a synthesis region from the first input image comprises using the HSV data to convert a region satisfying a preset Hue range from the first input image into a chroma-key synthesis region. It may be characterized by the selection.

According to the present invention, there is provided an image synthesizing apparatus and method of a digital imaging apparatus capable of performing stable and high-performance image synthesis by providing components separately from a CPU and a memory embedded in a portable imaging apparatus.

According to the present invention, there is provided an image synthesizing apparatus and method of a digital imager capable of managing resources more efficiently by implementing all components for image synthesizing with a low power small IC (ASIC).

According to the present invention, there is provided an image synthesizing apparatus and method of a digital imaging apparatus capable of generating and outputting a variety of synthetic images by implementing various synthesis methods and easily designating a substitute image.

According to the present invention, there is provided an image synthesizing apparatus and method for a digital imaging apparatus which can reduce manufacturing costs by simply synthesizing two input images without using a complicated application processor.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The image synthesizing method of the digital imaging apparatus may be performed by an image synthesizing apparatus.

1 is a block diagram of a digital imaging apparatus having an image synthesizing apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the digital imaging apparatus may include an image data receiving device 101, a decoder 102, a memory 103, a CPU 104, an image synthesizing device 105, and an output device 106. .

Here, the digital video device may correspond to any video device using digital video such as a mobile phone with a camera, a mobile phone capable of receiving DMB, a portable video terminal including a PMP, a PDA, an IPTV set-top box, and the like.

In the related art, the CPU 104 converts and processes a digital image (still image and a moving image) received by the image data receiving apparatus 101 through the decoder 102. In particular, the CPU 104 synthesized or edited the received digital image using the memory 103.

However, since the CPU 104 and the memory 103 are configured to process other functions of the digital imaging device together, a lot of overhead has been incurred in the image processing that consumes a lot of system resources.

In other words, since the CPU 104 stores and synthesizes image data for each frame of an image to be synthesized in the memory 103, the synthesis between images, in particular, the synthesis of a video and a video, causes a serious overload of the system.

Accordingly, in order to solve the above problems, the digital imaging apparatus according to the present invention may be provided with an image synthesizing apparatus 105 that is independent of the CPU 104 to process image synthesis. Here, the CPU 104 may bypass the two input images to be synthesized by only the image synthesizing apparatus 105 so as to reduce an overload generated through image synthesis.

In addition, the CPU 104 may send a control signal to the image synthesizing apparatus 105 for determining whether to synthesize the image and a method for synthesizing the image. Then, the image synthesizing apparatus 105 may perform image synthesis, which is the object of synthesis, by the control signal. After image synthesis is completed, the output device 106 may output the synthesized image.

Here, since the image synthesizing apparatus 105 according to the present invention is preferably provided in a portable image device, it is required to use a chip that can be miniaturized and has a small power consumption.

Accordingly, the image synthesizing apparatus 105 may be miniaturized and manufactured as an application-specific integrated circuit (ASIC) or a field-programmable gate array (FPGA) chip corresponding to an IC circuit consuming low power. .

2 is a block diagram illustrating a configuration of an image synthesizing apparatus according to an embodiment of the present invention.

Referring to FIG. 2, the image synthesizing apparatus 201 may include a frame buffer 202, a synthesis region determiner 203, and an image synthesizer 204.

The frame buffer 202 may buffer the first input image 205 for each frame. For example, the first input image 205 may correspond to an image that is a key in image synthesis, and may correspond to image data having any one of RGB, YCbCr, or YUV coordinates. However, it is not limited to the above-mentioned coordinate type.

In more detail, the frame buffer 202 may buffer the entire screen of the first input image 205 using an internal memory. Therefore, the frame buffer 205 may embed a memory having a size corresponding to the entire screen of the first input image 205.

The synthesis region determiner 203 may collect image data by scanning the first input image 205 in the frame buffer 201, and determine the synthesis region using the collected image data.

The synthesis region determined by the synthesis region determiner 203 may vary depending on the synthesis method. The synthesis method may be determined through the control signal 207 sent by the CPU. For example, the control signal 207 input to the synthesis region determiner 203 in FIG. 2 may influence the synthesis region determination to determine the synthesis region. In addition, the synthesis region determiner 203 may refer to the register of the synthesis condition stored in advance by the control signal 207. The synthesis region may be the entirety of the first input image 205 or may be a specific portion.

In addition, the synthesis region may have a form in which the entire image of the first input image 205 is reduced or enlarged. The synthesis region may be in a form in which a special effect is expressed in the first input image 205 or modified in various shapes.

In detail, the synthesis region determiner 203 may collect image data of the first input image 205 by scanning the first input image 205 in the frame buffer 201. Only the synthesis region may be selected by comparing and selecting the collected image data according to a synthesis method. As a result, it is possible to determine whether to exclude or include the scanned first input image 205 to determine a key image which is a composition region.

In one example, the synthesis methods are chroma key, luminsky and PIP methods. In addition, the synthesis method may include methods such as a linear key, a matte key, a self key, and an external key. According to the present invention, image synthesis may be performed using chroma key, luminsky, and PIP synthesis methods that are most frequently used.

Hereinafter, it will be described how the image synthesizing apparatus 201 of the present invention implements a chroma key, a luminanceinsky, and a PIP method.

In general, the chroma key synthesis method corresponds to a synthesis method in which a specific color having high saturation is filled with another image. The chroma key synthesis method can be mainly used in broadcasting TV weather forecasts and news.

In the chroma key synthesis method, the first input image 205 corresponding to the key image may include a synthesis region and a region corresponding to a highly saturated color. Then, the synthesis region determiner 203 may set the saturation range, and determine the synthesis region by excluding the color having the saturation over the set range.

At this time, it is possible to determine whether or not the saturation set by using the HSV data. In detail, the HSV data may be obtained by converting image data collected by scanning the first input image 205.

Since the first input image 205 has data of coordinates corresponding to any one of RGB, YCbCr, or YUV coordinates, the synthesis region determiner 203 uses coordinates of RGB, YCbCr, or YUV, respectively, through various types of conversion equations. Can be converted to HSV coordinates.

Since the HSV conversion data has a linear characteristic, it may be mainly used because it is easy to implement in a hardware circuit, and may include Hue, Saturation, and Value values. The synthesis region determiner 203 may determine whether the first input image 205 exceeds a preset saturation value using the Hue (color) value of the HSV data.

In general, the Luminsky synthesis method is a kind of linear key by synthesizing a key from a luminance signal. The Luminussky synthesis method can be mainly used to synthesize broadcast video subtitles.

In the two input images, a bright image may be synthesized as a foreground image which is a key, and a dark image may be synthesized as a background image. In detail, in the method of luminance synthesis, the first input image 205 corresponding to the key image may include an area having various brightnesses. Then, the synthesis region determiner 203 may set the range of brightness and determine the synthesis region by excluding an area having brightness that does not correspond to the range.

At this time, the synthesis region determiner 203 may determine whether the brightness set using the HSV data is exceeded. Here, the synthesis region determiner 203 may determine whether the first input image 205 exceeds a preset brightness value range by using a value (brightness) value of the HSV data.

In general, the PIP synthesis method corresponds to a method of inserting a key image into a background image. The PIP synthesis method may be a single PIP synthesis method when there is only one key image, and may be a multi-PIP synthesis method when two or more devices of the present invention are connected in series to configure two or more key images.

The inserted key image may be configured differently according to a preset synthesis condition. The synthesis region determiner 203 may determine, as the synthesis region, an area that satisfies a preset synthesis condition using the image data scanned from the first input image 205. Here, the synthesis condition may include at least one of a synthesis size, a synthesis position, a specific effect, or an image shape.

As a result, the present invention can perform various synthesis methods while using a simple configuration device, which is more efficient than the synthesis method using a CPU and a memory.

The synthesis region determination unit 203 will be described in detail with reference to FIGS. 3 and 4.

The image synthesizer 204 may synthesize the second input image 206 corresponding to the synthesized region and the background image by the synthesized region determiner 203. The image synthesizer 204 may synthesize the synthesis region and the second input image 206 by a mixing method or a masking method.

The image synthesizing unit 204 may synthesize the synthesis region and the second input image 206 by the control signal 207 sent by the CPU. In this case, the control signal 207 may be characterized by determining any one of a chroma key synthesis method, a luminance key synthesis method, and a PIP synthesis method.

For example, in a digital imaging apparatus, the CPU may serve as a connection path by bypassing two input images without directly composing them. However, the control signal 207 for determining the synthesis method may be sent to the image synthesizing unit 204 included in the image synthesizing apparatus 201. Then, the image synthesizing unit 204 may synthesize the synthesis region and the second input image 206 by using the synthesis method determined by the received control signal 207.

In addition, the image synthesizing unit 204 may synthesize the synthesis region or the second input image 206 in which the transparency is adjusted using the alpha blending effect. The final synthesized result may vary depending on the alpha value representing transparency.

The alpha blending effect can be blended by making the synthesis region more transparent on the background image. By using the transparency effect of two colors, an effect of overlapping two images may be exhibited.

3 is a detailed block diagram of a synthesis region determiner for chroma key and luminance synthesis in an image synthesizing apparatus according to an embodiment of the present invention.

Referring to FIG. 3, the synthesis region determiner 302 may include an image scanning unit 303, an HSV converter 304, and a synthesis region selector 305.

The image scanning unit 303 may collect the image data of the first input image by scanning the frame buffer 301. The image scanning unit 303 may read image data for each pixel of the first input image.

The area scanned by the image scanning unit 303 may correspond to an area of the first input image that matches each pixel of the background image. That is, when the first input image is larger than the background, the image scanning unit 303 may scan as much as the background size. In contrast, when the first input image is smaller than the background image, the image scanning unit 303 may scan the entire first input image.

The HSV converter 304 may convert the image data collected by scanning the first input image into HSV data. As already mentioned, the HSV data format is linear and has the advantage of being easily implemented in hardware. The image data of the first input image may be converted into HSV data to have Hue, Saturation, and Value values.

The synthesis region selector 305 may select a synthesis region from the first input image by using the converted HSV data. In this case, the HSV data value of a specific coordinate of the first input image, which is a comparison factor, may be set in a register.

Then, the synthesis region selector 305 may select whether to include or exclude the region in the synthesis region by comparing the HSV data already set and the HSV data corresponding to the other region of the first input image. Therefore, the synthesis region selector 305 may include at least one comparator and a selector.

For example, in FIG. 3, the synthesis region selector 305 may be influenced by a control signal in selecting the synthesis region. In addition, the synthesis region selector 305 may refer to the register of the synthesis condition stored in advance by the control signal.

For example, the synthesis region selector 305 may select, as the chroma key synthesis region 306, a region in which the HSV data satisfies a preset color range in the first input image. Here, the color range may be a specific coordinate of the preset first input image or an average color value of the entire first input image.

Since the chroma key synthesis method excludes a color having a high saturation value from a key image as a synthesis region, the preset color range may be determined to be equal to or less than a specific saturation value. As a result, the synthesis region selector 305 may select, as the chroma key synthesis region 306, an area corresponding to a saturation value or less in the first input image.

For example, the synthesis region selector 305 may select, as the luminance synthesis region 307, a region in which the HSV data satisfies a preset brightness value in the first input image. Here, the brightness range may be a specific coordinate of the preset first input image or an average brightness value of the entire first input image.

Since the Luminensky compositing method uses a color having a high brightness value as the composition area in the key image, the preset brightness range may be determined to be greater than a specific brightness value. As a result, the synthesis region selector 305 may select a region corresponding to a specific brightness value or more in the first input image as the luminensky synthesis region 307.

4 is a detailed block diagram of a synthesis region determiner for PIP synthesis in an image synthesizing apparatus according to an embodiment of the present invention.

Referring to FIG. 4, the synthesis region determiner may include an image scanning unit 402 and a synthesis region selector 403. The main difference from the configuration of FIG. 3 is that there is no HSV converter. That is, the PIP synthesis method does not select the synthesis region using the hue, saturation, etc. of the image data.

The image scanning unit 402 may collect image data of the first input image by scanning the frame buffer 301. The image scanning unit 303 may read image data for each pixel of the first input image.

Since the PIP synthesis method partially inserts the key image into the background image, the entire PIP synthesis method can scan the entire first input image and scan only a specific portion of the first input image. Subsequently, the synthesis region determiner may reduce or expand the entire scanned first input image to a size to be inserted.

The synthesis region selector 403 may select, as the synthesis region, a region satisfying a preset synthesis condition in the first input image by using the scanned image data. In this case, the synthesis condition may include at least one of a preset synthesis size, a synthesis position, a specific effect, or an image shape. The above-described synthesis condition is only an example and may be set differently for each digital imaging device.

The composite size may mean the size of a key image to be inserted, and the composite position may mean a position at which the key image is inserted into the background image. The specific effect may include special effects such as mosaic and paint added to the key image, and the image shape may include a circle, a square, a star, and the like.

For example, the synthesis region selector 403 may select, as the PIP synthesis region 404, a region that satisfies a preset synthesis condition in the first input image.

5 is a flowchart illustrating an image synthesizing method according to an embodiment of the present invention.

Referring to FIG. 5, in the method for synthesizing an image of a digital imaging apparatus according to an embodiment of the present invention, the entire screen of the first input image is buffered using an embedded memory (S501).

In addition, according to an embodiment of the present invention, an image synthesizing method of a digital imaging apparatus collects image data for each frame by scanning a first input image (S502).

In this case, in the collecting of the image data by scanning the first input image (S502), the image data may be collected by scanning the first input image buffered in the frame buffer.

The region to be scanned may be the whole or a specific portion of the first input image, and the region may vary according to a synthesis method.

In addition, the image synthesis method of the digital imaging device according to an embodiment of the present invention converts the image data collected by scanning to HSV data (S503).

In operation S504, the image synthesizing method of the digital imaging apparatus selects a region satisfying a preset color range from the first input image using the converted HSV data (S504).

In this case, in operation S504, the region satisfying the preset color range is selected as the chroma key synthesis region by excluding a region exceeding a specific Hue value in the first input image by using the Hue value in the transformed HSV data. You can select it as a composite area.

In addition, according to an embodiment of the present invention, the image synthesizing method of the digital imaging apparatus selects a region satisfying a predetermined brightness range in the first input image as the luminance synthesis region using the converted HSV data (S505).

In this case, in operation S505 of selecting a region satisfying a predetermined brightness range as a luminsky synthesis region, a region exceeding a specific value value in the first input image using a value value in the converted HSV data is included in the luminsky synthesis region. Can be selected.

In addition, in the method of synthesizing an image of a digital imaging apparatus according to an embodiment of the present invention, a region satisfying a preset synthesis condition is selected as a PIP synthesis region in the first input image (S506).

In this case, the synthesis condition may include at least one of a preset synthesis size, a synthesis position, a specific effect, or an image shape.

In addition, according to an embodiment of the present invention, an image synthesizing method of a digital imaging apparatus synthesizes a synthesis region determined by a control signal with a second input image set as a background image (S507).

At this time, the control signal may determine any one of the chroma key synthesis, the Luminance synthesis or PIP synthesis.

In operation S507, the synthesis region and the second input image may be synthesized using an alpha blending effect of adjusting the transparency of the determined synthesis region or the second input image.

Content not described with respect to the steps illustrated in FIG. 5 is the same as already described with reference to FIGS. 1 to 4, and thus will be omitted.

An image synthesizing method of a digital imaging apparatus according to the present invention may be implemented in the form of program instructions that can be executed by various computer means and recorded on a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. The medium may be a transmission medium such as an optical or metal wire, a waveguide, or the like including a carrier wave for transmitting a signal specifying a program command, a data structure, or the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

201: video synthesizing apparatus 202: frame buffer

203: Combination region determiner 204: Image synthesizer

205: First input image 206: Second input image

207: control signal

Claims

A frame buffer for buffering the first input image frame by frame;

A synthesis region determiner configured to determine a synthesis region by using the image data scanned from the first input image; And

An image synthesizing unit synthesizing the determined synthesis region with a second input image set in the background by a control signal for determining an image synthesizing method.

Image synthesizing apparatus of a digital imaging apparatus comprising a.

The method of claim 1,

The frame buffer,

And a built-in memory to buffer the entire screen of the first input image.

The method of claim 1,

The synthesis region determiner,

An image scanning unit configured to scan the buffered first input image and collect image data of the first input image;

An HSV converting unit converting the collected image data into HSV data; And

A synthesis region selection unit which selects a synthesis region from the first input image by using the converted HSV data

Image synthesizing apparatus of a digital imaging apparatus comprising a.

The method of claim 3,

The synthesis region selection unit,

And using the HSV data to select a region satisfying a preset color range as the chroma-key synthesis region in the first input image.

The method of claim 3,

The synthesis region selection unit,

And a region satisfying a predetermined brightness range in the first input image as a luminance-key synthesis region using the HSV data.

The method of claim 1,

The synthesis region determiner,

An image scanning unit configured to scan the buffered first input image and collect image data of the first input image; And

A synthesis region selector configured to select a region satisfying a preset synthesis condition in the first input image as a synthesis region by using the image data;

Including,

The synthesis condition is,

An image synthesizing apparatus of a digital imaging apparatus comprising at least one of a preset synthesis size, a synthesis position, a specific effect, or an image shape.

The method of claim 6,

The synthesis region selection unit,

And an area that satisfies a preset synthesis condition in the first input image is selected as a picture in picture (PIP) synthesis region by using the image data.

The method of claim 1,

The image synthesis unit,

And synthesizing the determined synthesis region with a second input image by a control signal for determining any one of chroma key synthesis, luminance synthesis or PIP synthesis.

The method of claim 1,

The image synthesis unit,

And synthesizing using the alpha blending effect of adjusting the transparency of the determined synthesis region or the second input image.

Buffering the first input image frame by frame;

Determining a synthesis region using image data scanned from the first input image; And

Synthesizing the determined synthesis region with a second input image having a background set by a control signal for determining an image synthesis method;

Image synthesis method of a digital imaging device comprising a.

The method of claim 10,

The buffering of the first input image for each frame may include:

And an entire memory of the first input image is buffered using a built-in memory.

The method of claim 10,

Determining the synthesis region,

Scanning the buffered first input image to collect image data of the first input image;

Converting the collected image data into HSV data; And

Selecting a synthesis region in the first input image by using the converted HSV data

Image synthesis method of a digital imaging device comprising a.

The method of claim 12,

Selecting a synthesis region from the first input image,

And selecting a region that satisfies a preset color range in the first input image as a chroma key synthesis region by using the HSV data.

The method of claim 12,

Selecting a synthesis region from the first input image,

And a region satisfying a predetermined brightness range in the first input image as a luminance-sky synthesis region using the HSV data.

The method of claim 10,

Determining the synthesis,

Collecting the image data of the first input image by scanning the buffered first input image; And

Selecting a region satisfying a preset synthesis condition from the first input image as a synthesis region by using the image data;

Including,

The synthesis condition is,

And at least one of a preset synthesis size, a synthesis position, a specific effect, or an image shape.

The method of claim 15,

Selecting a region satisfying a preset synthesis condition in the first input image as a synthesis region,

And selecting an area satisfying a preset synthesis condition from the first input image as a PIP synthesis area using the image data.

The method of claim 10,

Synthesizing the determined synthesis region with the second input image set in the background,

The method of claim 10,

And synthesizing using an alpha blending effect for adjusting the transparency of the determined synthesis region or the second input image.

A computer-readable recording medium in which a program for executing the method of any one of claims 10 to 18 is recorded.