KR100224581B1 - Image enlargement apparatus and method using child-screen - Google Patents

Abstract

According to the present invention, an image magnification apparatus using a magnetic screen capable of increasing the resolution by applying an image interpolation method to the enlarged partial image while allowing the entire image and the enlarged partial image to be viewed in the same screen using the magnetic screen. And a method for expanding a partial image to be enlarged in a horizontal and vertical direction and at the same time an enlarged partial image and a whole image reduced in a sub-screen are displayed on the same screen. There is a purpose.

According to an image magnification apparatus and method using a magnetic screen according to the present invention, when a user designates a portion to be reduced and displayed on a magnetic screen on a display device and a portion to be enlarged on the magnetic screen, the designated portion is enlarged in the horizontal and vertical directions At the same time, the enlarged partial image and the entire image reduced in the sub picture are displayed on the same screen so that the user can see the accurate and lively enlarged image.After setting the screen to be enlarged completely, only the enlarged partial image is displayed. Since the entire image including the part to be enlarged and the enlarged partial image cannot be viewed at the same time, the reality and vividness of the enlarged partial image are deteriorated, and when the correction is to be made to the screen to be enlarged, The inconvenience of the general image magnification system can be easily solved. .

Description

Image magnification apparatus and method using sub picture. {IMAGE ENLARGEMENT APPARATUS AND METHOD USING CHILD-SCREEN}

The present invention relates to an image magnification apparatus and method, and more particularly, an image interpolation method for an enlarged partial image while allowing an entire image and an enlarged partial image to be viewed on the same screen using a sub picture. The present invention relates to an image magnification apparatus and method using a magnetic screen capable of increasing resolution by applying interpolation.

Image zooming technologies include the field of Computer Supported Cooperative Work (CSCW) and image processing and computer graphics such as image recognition, image recovery, and image quality improvement. , A basic image processing technique that is useful in a wide range of fields such as computer aided design (CAD), television broadcasting, etc. In particular, PIP (Picture In), which has recently been widely applied in fields such as computer image editing and simultaneous TV broadcasting, is used. It is also useful for picture technology.

On the other hand, when the image is simply enlarged, image interpolation is performed to increase the resolution by using the linearity and spatial characteristics of the pixels included in the enlarged image as the image quality deteriorates due to the decrease in the spatial resolution of the image. It is generally used for improvement.

1 is a block diagram of a general image magnification system.

As shown in FIG. 1, a general image magnification system includes a video RAM 8 including a first video RAM 4 storing a luminance signal, a second video RAM 5 storing a chroma signal, and an input signal. A write address generator (1) for generating a write address for the video RAM (8) in accordance with the synchronized clock (PLL CLK) and the input horizontal and vertical synchronization (HV SYNC); A read address generator 2 for generating a write address in accordance with the write clock RD CLK and the read input horizontal and vertical synchronization RDHV SYNC, and multiplexing the write address and read address; And a memory control (3) for generating a serial clock (SC) for synchronizing, synchronizing, and reading the data of the video RAM 8 and the first video RAM 4; Single at interpolation of luminance signal And a multiplexer 7 for multiplexing the luminance signal of the first video RAM 4 with the luminance signal of the line memory 6.

Referring to Figure 1 the operation of the general image magnification system configured as described above are as follows.

First, the write address generator 1 generates a write address for the video RAM 8 in accordance with a clock PLL CLK synchronized with an input signal and an input horizontal and vertical sync HV SYNC. The read address generator 2 generates a read address in accordance with the write clock RD CLK and the read input horizontal and vertical synchronization RDHV SYNC. The CPU (Central Processing Unit (not shown)) according to the position to be enlarged, The read start address is changed and output. However, the reading start address is changed only after the setting for the portion to be enlarged is completed.

Meanwhile, the memory control unit 3 receives the write address generated by the write address generator 1 and the read address generated by the read address generator 2, multiplexes and synchronizes the data of the video RAM 8. Generate a serial clock to read.

If the image of the portion to be enlarged is to be doubled, the rate of the read address is 0.5 times the ratio of the write address, and the serial clock SC is also 0.5 times slower than the clock PLLCLK synchronized with the input signal. .

In general, when an image is simply enlarged, the resolution is degraded and the image quality is degraded. Therefore, many methods of improving image quality using linear interpolation are used.

In one example, Zero Order Interpolation (ZOI), one of the simplest forms of linear interpolation, performs interpolation by repeating an upper line as it is to a lower line through the line memory 6.

This method is also called a line repetition method, and its implementation is simple, but it has limited applicability since it cannot expect a satisfactory picture quality improvement effect due to interpolation characteristics. In practice, this approach is being applied to liquid crystal device projector systems.

The lack of interpolation for the chromaticity signal is due to the human visual characteristic that it is relatively insensitive to the degradation of the chromaticity signal compared to the degradation of the luminance signal.

However, since the general image magnification system as described above cannot see the reduced whole image and the enlarged partial image at the same time, the reality and vividness of the enlarged partial image are degraded, and when a correction is to be made to the screen to be enlarged, There was a discomfort to go back to the original.

Accordingly, an object of the present invention is to reduce the entire image to be displayed on the child screen on the display device and to specify a portion to be enlarged on the child screen, the specified portion is enlarged in the horizontal and vertical directions and At the same time, the enlarged partial image and the entire image reduced in the sub picture are displayed on the same screen, so that you can see the accurate and lively enlarged image.After setting the screen to be enlarged completely, only the enlarged partial image is displayed. The present invention provides an image magnification apparatus and method using a magnetic screen to display.

1 is a configuration diagram of a general image magnification system;

Figure 2 is a block diagram showing an image magnification device using the magnetic screen of the present invention.

<Explanation of symbols for main parts of drawing>

10: luminance and chroma signal separation unit 20: clock and synchronization signal separation unit

40: signal separation unit 50: video RAM

51: The First Video RAM 52: The Second Video RAM

60: post-processing unit 61: interpolation unit

62: fourth multiplexer 70: memory controller

100: enlarged image address generator 110: read address generator

111: first read address generator 112: first multiplexer

113: second read address generator 120: write address generator

130: sub screen generator 140: serial clock generator

150: third multiplexer 160: second multiplexer

An image magnification apparatus and method using a magnetic screen according to the present invention for achieving the above object is to set the own screen window to be displayed by reducing the entire image in a predetermined region of the screen, and generated by the read clock and the read synchronization signal The address and serial clock are divided by a predetermined magnification and a predetermined reduction ratio, respectively, to reduce the read address for the enlarged partial image and the enlarged image address generator for generating the serial address and the read address and serial clock for the reduced entire image. The entire image and the enlarged partial image can be viewed in the same screen, and the resolution is increased by applying horizontal and vertical interpolation methods to the enlarged image.

A preferred embodiment of an image magnification apparatus using a magnetic screen according to the present invention will be described with reference to FIG.

As shown in FIG. 2, an image magnification apparatus using a magnetic screen according to an embodiment of the present invention inputs a video RAM 50 that stores a video signal to provide random access to the video signal, and a composite signal. And a signal separator 40 for inputting the luminance signal Y and the chroma signal C to the video RAM 50 by separating the synchronization signal, the luminance signal Y, and the chroma signal C from each other. The sub-image window to be displayed by reducing the entire image in the area is set using the read clock RDCLK and enlarged by the read clock RDCLK, the read horizontal sync signal HS, and the read vertical sync signal VS. The sub-window window is generated by dividing an address for a partial image to be enlarged at a predetermined magnification ratio and generating an enlarged read address for the enlarged partial image and dividing the address for the entire image at a predetermined reduction ratio. An interpolation of the enlarged image address generator 100 which generates a reduced read address so as to be located in the section and provides the video RAM 50 to the video RAM 50, and reads a signal from the video RAM 50, And a memory controller 70 which provides a control signal to the video RAM 50, the enlarged image address generator 100, and the post processor 60.

Here, the video RAM 50 includes a first video RAM 51 storing a luminance signal Y and a second video RAM 52 storing a chroma signal C, and the signal separating unit 40. ) Is a luminance and chroma signal separation unit 10 for separating the input composite signal into a luminance signal (Y) and a chroma signal (C), and receives the luminance signal (Y) and a chroma signal (C) horizontally with a clock. And a clock and sync signal separator 20 for separating the sync signal HS and the vertical sync signal VS. The post processor 60 interpolates the luminance signal Y by reading the video signal from the video RAM 50. An interpolation unit 61 for performing the above operation, and a fourth multiplexer 62 for multiplexing the interpolation signal and the luminance signal generated by the interpolation unit 61.

Meanwhile, the enlarged image address generator 100 divides an address generated by the read clock, the read synchronization signal, and the read start address by a predetermined enlargement ratio and a predetermined reduction ratio, respectively, to enlarge the read address and reduce the enlarged partial image. A read address generator 110 for generating a reduced read address for the entire image, and a write clock WTCLK, a horizontal sync signal HS, and a vertical sync signal VS from the clock and sync signal separator 20; Receiving an input of the write address generating unit 120 and the output of the read address generating unit 110 and the write address generating unit 120 and multiplexed to the video RAM 50 The sub-screen window is positioned by receiving the second multiplexer 160, the read clock RDCLK, the read horizontal sync signal RHS, and the read vertical sync signal RVS. Generates a section and provides it to the first multiplexer 112 and the third multiplexer 150 to generate a sub picture for switching a read address and a serial clock for the enlarged partial image and the reduced entire image, respectively. In the enlarged portion of the input unit 130 and the read clock RDCLK, the read clock RDCLK is divided by the predetermined magnification ratio, and in the sub-window window section, the read clock RDCLK is reduced to the predetermined reduction ratio. A third multiplexing unit, which is divided by the serial clock generator 140 and the output of the serial clock generator 140 and multiplexed under the control of the sub picture generator 130 and provided to the video RAM 50; It is composed of a portion (150).

The read address generator 110 may set an address for a partial image to be enlarged by using a read start address, a read clock RDCLK, a read horizontal sync signal RHS, and a read vertical sync signal RVS at a predetermined enlargement ratio. The first read address generator 111 generates an enlarged read address for the divided and enlarged partial image, and is generated by using the read clock RDCLK, the read horizontal sync signal RHS, and the read vertical sync signal RVS. A second read address generator 113 generating a reduced read address for the reduced entire image by dividing an address for the entire image by a predetermined reduction ratio; and the first read address generator 111 and the second read address. It is composed of a first multiplexer 112 that receives the output of the generator 113 and multiplexes it and provides it to the second multiplexer 160.

Hereinafter, the operation of the preferred embodiment of the present invention configured as described above will be described in detail with reference to FIG.

First, when a composite video signal is input, the luminance and chroma signal separation unit 10 uses a comb filter or a band pass filter (BPF) to output the luminance signal Y and the chromaticity from the composite video signal. The signal C is separated, and the clock and sync signal separator 20 receives the separated image signal Y and the chroma signal C, and the clock, the horizontal sync signal HS, and the vertical sync signal VS. Disconnect. Thereafter, the write address generator 120 receives the clock, the horizontal synchronizing signal HS, and the vertical synchronizing signal from the clock and synchronizing signal separation unit 20 and uses the clock as the recording clock WDCLK. A recording address is generated to set horizontal and vertical valid sections on the video RAM 50 according to the &quot; That is, one row address of a write address is generated each time the horizontal sync signal HS is active, and a row address of a write address is generated each time the vertical sync signal VS is activated. addresses are generated one by one and applied to the second multiplexer 120.

Meanwhile, the first read address generator 111 divides the address of the partial image to be enlarged by using the read clock RDCLK, the read horizontal sync signal RHS, and the read vertical sync signal RVS at a predetermined magnification ratio. To generate an enlarged read address for the enlarged partial image, and the second read address generator 113 uses the read clock RDCLK, the read horizontal sync signal RHS, and the read vertical sync signal RVS. The address for the image is divided by a predetermined reduction rate to generate a reduced read address for the entire image reduced in the sub-window window section. Thus, the first multiplexer 112 is connected to the first read address generator 111. The output of the second read address generator 113 is input and multiplexed and provided to the second multiplexer 160.

The serial clock generator 140 receives the read clock RDCLK and divides the read clock RDCLK by the predetermined magnification in the enlarged part, and divides the read clock RDCLK in the sub-window window section by the predetermined magnification. The sub-screen generation unit 130 receives the read clock RDCLK, the read horizontal sync signal RHS, and the read vertical sync signal RVS by dividing by a reduction ratio of the sub-screen. By generating a section in which a window is located and providing it to the first multiplexer 112 and the second multiplexer 150, the read address and the serial clock of the enlarged partial image and the reduced entire image are switched, respectively. Accordingly, the third multiplexer 150 receives the output of the serial clock generator 140 and multiplexes the output of the serial clock generator 140 to provide it to the video RAM 50.

In the above, dividing an address and a serial clock generated by using a read clock and a read synchronization signal at a predetermined magnification ratio and a predetermined reduction ratio reduces the entire image and displays a portion to be enlarged on the child screen on the display device. When the user designates, the designated part is enlarged in the horizontal and vertical directions, and the enlarged partial image and the image to be enlarged are displayed on the same screen.

According to an embodiment of the present invention, when the position of the jaw surface window is positioned at the lower right side of the screen, the predetermined magnification ratio is 200%, and the predetermined reduction ratio is 50%. 111 divides the address for the portion to be enlarged by 2, and the second read address generator 113 multiplies the address for the entire image by 2 because the enlarged read address for the enlarged partial image is the write address. This is because the reduction read address must be twice as fast as the write address in order to be 2 times slower and to reduce the entire image and display the reduced entire image in the sub-screen window.

In addition, since the serial clock should be twice as slow as the read clock in the enlarged partial image section and twice as fast as the write clock in the sub picture section, the serial clock generator 140 reads the input as the enlarged partial image section. When the clock RDCLK is divided by two, and in the sub-window window section, the read clock RDCLK is multiplied by 2 and applied to the third multiplexer 150 to select the sub-screen by the sub-screen selection signal of the sub-screen generation unit 140. And selectively input to the video RAM 50, respectively.

The memory controller 70 generates control signals such as a low address strobe (RAS), a column address strobe (CAS), a write enable bar (WEB), and the like, to control the video RAM 50. The second multiplexer 160 and the fourth multiplexer 62 are provided.

The first video RAM 51 receives a write address for recording the luminance signal Y under the control of the memory controller 70 through the second multiplexer 160, and separates the clock and sync signals at the write address. After the luminance signal applied from the unit 20 is recorded, when the serial clock is applied through the third multiplexer 150, the luminance signal is read from the second multiplexer 160 under the control of the memory controller 70. When the read address is input and the luminance signal Y of the read address is output in synchronization with the serial clock, the interpolation section 61 passes the luminance signal Y without interpolation in the sub-window window section and enlarges the image section. The interpolation image signal is generated by interpolating the luminance signal Y through a line repetition method, and the fourth multiplexer 62 multiplexes and outputs the luminance signal Y and the interpolation image signal.

In addition, the second video RAM 52 receives a write address for recording a chroma signal under control of the memory controller 70 through the second multiplexer 160, and the clock and sync signal separator is provided at the write address. After the chroma signal is applied from the apparatus 20, the serial clock is applied through the third multiplexer 150, and the chroma signal is read from the second multiplexer 160 under the control of the memory controller 70. The read address is input, and the luminance signal Y of the read address is output in synchronization with the serial clock.

As described above, no interpolation is performed on the chromaticity signal due to the human visual characteristic that the chromaticity signal C is relatively insensitive to the degradation of the chromaticity signal Y.

When the setting for the image to be finally enlarged is completed, the reduced entire image displayed in the sub-window window section is removed from the screen by the control of the memory controller 70 to display only the enlarged image.

A preferred embodiment of the image magnification method using the magnetic screen according to the present invention will be described below.

According to an aspect of the present invention, there is provided a method of enlarging an image, comprising: a signal separation step of receiving a signal and separating a clock, a synchronization signal, and an image signal; An image storing step of storing the video signal at the recording address of a storage means, a child screen setting step of receiving a read clock and a synchronization signal from a CPU and setting a own screen window, and an address for the entire image at a predetermined reduction ratio A reduced read address generating step of generating a reduced read address for dividing the entire image in the sub-window window section by dividing, and receiving a read clock and a sync signal from a CPU and expanding the scan clock and a read sync signal; Enlarge the address of the partial image to be divided by a predetermined magnification. An enlarged read address generating step of generating an enlarged read address for the partial image, an image read step of reading the image signal stored in the enlarged read address and the reduced read address from the storage means, and an image read in the image read step An interpolation image generation step of generating an interpolation image signal using the signal, a multiplexing step of multiplexing and displaying the interpolation image signal and the image signal read in the image reading step, and setting of the image to be enlarged is completed. The enlarged image display step of removing the reduced whole image being displayed in the sub-window window section from the screen and displaying only the enlarged image under the control of.

Hereinafter, the procedure of the image magnification method using the magnetic screen according to the present invention configured as described above will be described in detail.

First, when a signal is input, a signal is input in the signal separation step to separate a clock and a synchronization signal and an image signal. In the recording address generation step, the clock and the synchronization signal are input to generate a write address to generate the recording address. The video signal is stored in a write address.

Subsequently, when a sub screen window is set by receiving a read clock and a synchronization signal from a CPU in a sub screen setting step, the sub read address generation step divides the address of the entire image by a predetermined reduction ratio and reduces the sub screen window period. A reduced read address for generating the entire image is generated. In the enlarged read address generating step, a read clock and a sync signal are input from a CPU to determine an address for a partial image to be enlarged using the read clock and the read sync signal. A magnification read address is generated for the enlarged partial image by dividing by an enlargement ratio of.

Subsequently, when the video signal stored in the enlarged read address and the reduced read address is read from the storage means in the video reading step, the interpolated video generating step uses the video signal read in the video reading step to interpolate the interpolated video signal. In the multiplexing step, the interpolated video signal and the video signal read in the video reading step are multiplexed and displayed.

When the setting for the image to be magnified is finally completed, the enlarged image display step removes from the screen the entire reduced image displayed in the sub-window window section under the control of the CPU and displays only the enlarged image.

As described in detail above, according to the image magnification apparatus and method using the magnetic screen according to the present invention, if the user to specify a portion to be reduced to display the image on the child screen on the display device and to enlarge the child screen, the designated portion As the magnified image is enlarged in the horizontal and vertical direction and the enlarged partial image and the entire image reduced in the sub picture are displayed on the same screen, it is possible to see an accurate and lively enlarged image. When only the enlarged partial image is displayed, the entire image including the portion to be enlarged and the enlarged partial image cannot be viewed at the same time, thereby reducing the realism and vividness of the enlarged partial image, and when modifying the screen to be enlarged. Common video magnification system that needs to be restored It is possible to easily eliminate the inconvenience.

Claims (12)

An image magnification apparatus for enlarging a partial image included in an entire image, Image storage means for storing the entire image; A sub picture generating unit which receives a read clock and a read synchronization signal and generates a section in which a sub picture window to be displayed by reducing the entire image in a predetermined area of the screen is located; A first read address generator for generating an enlarged read address for the enlarged partial image by dividing an address for the enlarged partial image generated by using the read clock and the read synchronization signal and the read start address at a predetermined enlargement ratio; A second read address generator for dividing an address for the entire image at a predetermined reduction rate to generate a reduced read address for the reduced entire image; A recording address generator for generating a recording address for recording an input video signal in said video storing means; A first multiplexer which receives the outputs of the first read address generator and the second read address generator, and multiplexes the outputs; A second multiplexer which receives the outputs of the first multiplexer and the write address generator and multiplexes them to the image storage means; A serial clock generator for dividing the read clock at the predetermined magnification ratio in the enlarged portion of the read clock input and dividing the read clock at the predetermined reduction ratio in the sub picture window section to generate respective serial clocks; ; A third multiplexing unit receiving the output of the serial clock generator and multiplexing the same by controlling the sub picture generator to provide the image storing means to the image storing unit; And And a post-processing unit which interpolates the enlarged partial image by reading the image signal stored at the magnification reading address of the image storing means. The apparatus of claim 1, wherein the predetermined enlargement ratio is 200% and the predetermined reduction ratio is 50%. The interpolation unit of claim 1, wherein the post-processing unit reads an image signal stored at an enlarged read address of the image storage unit and generates an interpolation image signal using an image interpolation method, and the interpolation image signal and a luminance signal are multiplexed. An image magnification device using a magnetic screen, characterized by comprising a fourth multiplexer. 4. The apparatus of claim 3, wherein the image interpolation method is a line repetition method. An image magnification apparatus for enlarging a partial image included in an entire image, A video RAM for storing the entire image to provide random access to the entire image; A signal separation unit configured to receive a composite signal and separate a synchronization signal, a luminance signal, and a chroma signal and input the luminance signal and the chroma signal to the video RAM; The enlarged partial image is set by setting a sub-window window on which the entire image is reduced and displayed in a predetermined area of the screen, and dividing the address for the enlarged partial image generated by using the read clock and the read synchronization signal at a predetermined enlargement ratio. An enlarged image address generator for generating an enlarged read address for the entire image and dividing the address for the entire image at a predetermined reduction rate to generate a reduced read address so as to be located in the sub-window window section and to provide the enlarged read address to the video RAM; And a memory controller configured to provide a control signal to the video RAM, the enlarged image address generator, and the post processor. The image magnification apparatus of claim 5, wherein the image magnification apparatus further comprises a post-processing unit configured to read a signal from the video RAM and perform multiplexing by performing interpolation on the enlarged partial image signal. The display apparatus of claim 5, wherein the magnified image address generator comprises: a sub-screen generating unit configured to receive the read synchronization signal and generate a section in which the sub-screen window is located; A read start address, an address for the partial image to be enlarged using the read clock and the read synchronization signal, is divided by the predetermined magnification to generate an enlarged read address for the enlarged partial image, and the address for the entire image A read address generator for generating a reduced read address so that the entire image reduced by dividing at a predetermined reduction rate is located in the sub-screen window section; A write address generator for receiving a write clock, a horizontal sync signal, and a vertical sync signal from the signal separator to generate a write address; A second multiplexer which receives the outputs of the read address generator and the write address generator, and multiplexes them to the video RAM; A serial clock generation unit generating a serial clock by dividing the read clock by the predetermined magnification ratio in the enlarged portion by receiving the read clock, and dividing the read clock by the predetermined reduction ratio in the sub picture window period; And a third multiplexer configured to receive the output of the serial clock generator and multiplex it under the control of the magnetic screen generator to provide the video RAM to the video RAM. The enlarged partial image of claim 7, wherein the read address generator generates the read start address, the address of the partial image to be enlarged using the read clock, and the read synchronization signal by dividing the address of the enlarged partial image by the predetermined enlargement ratio. A first read address generator for generating a read address; A second read address generator which generates a reduction read address for the reduced entire image by dividing the address for the entire image by the predetermined reduction ratio; And a first multiplexer configured to receive and multiplex the outputs of the first read address generator and the second read address generator, and provide the multiplexed outputs to the second multiplexer. The image magnification device using a magnetic screen according to claim 7, wherein the predetermined magnification ratio is 200% and the predetermined reduction ratio is 50%. The display device of claim 5, wherein the signal separator comprises: a luminance and chroma signal separator for separating the input composite signal into the luminance signal and the chroma signal, a clock, a horizontal synchronization signal, and a vertical signal receiving the luminance signal and the chroma signal; An image magnification device using a magnetic screen, characterized by comprising a clock for separating the synchronization signal and a synchronization signal separation unit. The apparatus of claim 6, wherein the post processor is configured to read an image signal stored in an enlarged read address of the video RAM and to generate an interpolated image signal by using an image interpolation method, and to multiplex the interpolated image signal and a luminance signal. An image magnification apparatus using a sub picture, comprising four multiplexers. An image enlargement method for enlarging a partial image included in an entire image, comprising: a sub picture setting step of receiving a read clock and a synchronization signal from a CPU and setting a sub picture window; A reduced read address generation step of generating a reduced read address for locating the reduced entire image in the sub-window window section by dividing an address for the entire image by a predetermined reduction ratio under control of a CPU; The enlarged read address for the enlarged partial image is generated by receiving the read clock and the synchronization signal from the CPU and dividing the address for the enlarged partial image generated by using the read clock and the read synchronization signal at a predetermined enlargement ratio. An enlarged read address generating step; An image reading step of reading an image signal stored in the enlarged read address and the reduced read address from the storage means; An interpolation image generating step of generating an interpolation image signal using the image signal read in the image reading step; A multiplexing step of multiplexing and displaying the interpolated video signal and the video signal read in the video reading step, and an enlarged video display step of displaying only an enlarged video under control of a CPU when setting for an image to be enlarged is completed Image magnification method using a magnetic screen, characterized in that it comprises a.