KR100220821B1 - Electron zoom veriable device - Google Patents

Abstract

The present invention relates to an electronic zoom region variable device that allows an enlarged view of an object by varying the area of the electronic zoom even if the object to be enlarged exists at any position. The present invention provides a zoom control by adjusting a read / write address using a memory element. The target area can be enlarged by varying the reference area of the.

Accordingly, the present invention can be enlarged at any position other than the center of the screen when the screen is enlarged, and when the tape is played in the VTR, the electronic zoom is performed using an interpolation technique on the object displayed at the upper left corner of the screen. When you want to enlarge and observe the desired object, it can be usefully applied.

Description

Electronic zoom range variable

1 is a block diagram of a conventional digital zoom system.

2 is an enlarged state of the screen during the electronic zoom of FIG.

3 is a flowchart of an electronic zoom region varying method according to the present invention.

4 is a block diagram of an electronic zoom region variable apparatus according to the present invention.

5 is a detailed block diagram of the address generator of FIG.

6 is an image enlarged state diagram in an arbitrary area according to the present invention.

* Explanation of symbols for main parts of the drawings

30, 54, 57, 58, 59: multiplexer 31: field memory

32: address generator 33: luminance / color difference separator

34: interpolator 35: contour corrector

36: luminance / color difference mixer 37: luminance horizontal interpolator

38: luminance vertical interpolation unit 39, 42: delay unit

40: color difference horizontal interpolation portion 41: color difference vertical interpolation portion

50: horizontal address counter 51: vertical address counter

52: Zoom start horizontal address generator 53: Zoom start vertical address generator

55, 56, 61, 63: Adder 60: Zoom start horizontal address generator

62: Zoom start vertical address generator

The present invention relates to an electronic zoom region variable apparatus, and more particularly, to an electronic zoom region variable apparatus that enables an enlarged view of an object by varying the area of the electronic zoom even when the object to be enlarged exists at any position.

In general, an electronic zoom function is used when a camcorder or the like is used to closely observe an object existing at a long distance, and when an image medium using a tape, an LD, a CD, or the like is used, the electronic zoom function may be used to magnify an already recorded image.

In general, the method of enlarging an image includes an image enlargement method using an optical lens, which is used in a camcorder or a still camera, and interpolation on a digital image in conjunction with an optical lens to obtain a high magnification zoom effect. There is a digital electronic zoom method by electronic manipulation using the technique.

In particular, the electronic zoom method has been developed to compensate for the implementation inefficiency of the optical image magnification technique. As the technique for implementing electronic zoom, the implementation of electronic zoom by linear interpolation is most widely known. This is due to the ease of hardware implementation and the maintenance of high resolution at low magnification.

The conventional electronic zoom effect was implemented by sampling an image area corresponding to a zoom factor using a memory device, etc. based on the center of the screen, and then enlarging the image using horizontal and vertical data extension and interpolation techniques. . Therefore, when the object to be enlarged exists in an area other than the center, the object cannot be enlarged and viewed.

1 is a block diagram of a conventional digital zoom system.

Referring to FIG. 1, the configuration and operation of a conventional electronic zoom system will be described.

The digital zoom system shown in FIG. 1 uses an electronic linear interpolation technique, which converts an input image signal into a digital signal (Analog / Digital Converter) (1) and outputs the brightness of the ADC (1). A signal processing system 2 for converting a signal and a chrominance signal, an electronic zoom system 4 for performing electronic zoom with the output of the signal processing system 2, and a zoom for controlling the zoom magnification of the electronic zoom system 4 A magnification controller 5 and a DAC (Digital / Analog Converter) 3 for converting an electronic zoomed signal from the electronic zoom system 4 into an analog signal through an input through a signal processing system 2.

Here, the electronic zoom system 4 inputs information on the electronic zoom magnification output from the field memory 6, which stores the luminance signal and the color difference signal output from the signal processing system 2, and the zoom magnification controller 5 as an input. The luminance signal output from the field memory 6 under the control of the memory controller 8 controlling the field memory 6 and the zoom magnification controller 5 by generating a read / write address of the field memory 6. Luminance horizontal interpolation unit 7 for horizontal interpolation, and luminance vertical interpolation unit 9 for interpolating vertically with respect to the horizontal interpolated luminance signal output from luminance horizontal interpolation unit 7 under the control of the zoom horizontal controller 7. A chrominance horizontal interpolation unit 10 interpolating horizontally with respect to the chrominance signal output from the field memory 6 under the control of the zoom magnification controller 5, and a chrominance horizontal interpolation unit under the control of the zoom magnification controller 5. Horizontal interpolation output from (10) And a chrominance vertical interpolation section 11 that interpolates vertically with respect to the chrominance signal.

The operation of the conventional digital zoom system configured as described above will be described with reference to FIG.

2 is a screen state diagram during electronic zoom of FIG.

The input image signal is converted into a digital signal by the ADC 1 and then converted into a luminance signal and a chrominance signal by the signal processing system 2 and then input to the electronic zoom system 4 for electronic zoom.

On the other hand, the zoom magnification controller 5 outputs information on the electronic zoom magnification to the memory controller 8, and the memory controller 8 generates a read / write address accordingly.

The luminance signal and the chrominance signal input to the electronic zoom system are stored in the field memory 6 according to the write address generated by the memory controller 8 and then read according to the read address output from the memory controller 8 so that the luminance and the chrominance horizontally. It is output to the interpolation parts 7 and 10.

The luminance signals output from the field memory 6 are interpolated horizontally and vertically in the luminance horizontal and vertical interpolators 7 and 9 respectively under the control of the zoom magnification controller 5 and outputted to the signal processing system 2. Further, the color difference signals output from the field memory 6 are interpolated horizontally and vertically in the color difference horizontal and vertical interpolators 10 and 11 respectively under the control of the zoom magnification controller 5 and output to the signal processing system 2. do.

In this way, the horizontally and vertically interpolated and expanded luminance signals and color difference signals output from the electronic zoom system 4 are synthesized again through the signal processing system 2 and output as image signals, and output from the signal processing system 2. The synthesized signal is converted into an analog signal by the DAC 3 and output as an image.

In the conventional electronic zooming system which is configured as described above, the electronic zooming method of the general method enlarges the image based on the center of the screen, as shown in FIG. In this case, there was a disadvantage in that the image cannot be magnified and observed.

For example, in the case of an imaging apparatus using a recording medium such as a tape, when an object to be enlarged does not exist in the center of the screen but exists at a corner of the screen, the object cannot be enlarged and observed.

According to the present invention for improving the above disadvantages, even if the object to be enlarged does not exist at the center of the screen but at any position, the object can be enlarged by varying the reference area of the zoom by adjusting the read / write address using a memory element. It is an object of the present invention to provide an electronic zoom area variable device for the purpose.

In order to achieve the above object, an electronic zoom region varying method according to the present invention includes an image data storage step of storing image data, a zoom region determination step of determining a zoom region according to input zoom magnification information and zoom region information, and the determined zoom. An image data output step of outputting stored image data by generating a read address according to an area, an image data interpolation step of enlarging an image by interpolating the output image data, and storing the interpolated image data for re-enlarging And a re-expansion step to proceed to the data storage step.

In addition, the electronic zoom area variable apparatus according to the present invention is a multiplexer for selecting and outputting one of the enlarged image data of the input image data, field memory for storing the image data output from the multiplexer, system clock, horizontal drive pulse, zoom A address generator for generating a read / write address of the field memory by inputting area information and zoom magnification information to control the field memory, and a luminance / color difference for separating the luminance signal and the chrominance signal from the image data output from the field memory. A separator, an interpolator interpolating the luminance signal and the chrominance signal output from the luminance / color difference separator, a contour corrector for filtering the contour by filtering the luminance signal output from the interpolator to increase the resolution of the image, and the contour corrector Contour-corrected luminance scene output from And mixing the interpolated color difference signal output from the interpolator and is characterized in that created the original image data to the form of the material which is expanded comprises a luminance / chrominance mixer output to the multiplexer.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a flowchart of an electronic zoom region varying method according to the present invention.

In the method of varying the electronic zoom region according to the present invention, as shown in FIG. 3, the image data storage step 20, the zoom region determination steps 21, 22, and 23, the image data output steps 24 and 25, and the image data are shown. Interpolation step 26, contour correction step 27, and re-expansion step 28.

The image data storage step 20 stores the input image data in the field memory, and the zoom region determination steps 21, 22, and 23 determine the zoom region according to the input zoom ratio information and the zoom region information.

The image data output step 24 or 25 generates a read address according to the determined zoom area and outputs the stored image data. The image data interpolation step 26 enlarges the image by interpolating the output image data.

The contour correction step 27 is to correct the contour to increase the resolution of the image after performing the image data interpolation step 26.

The re-expansion step 28 proceeds to the image data storage step 20 to store interpolated image data in the field memory for re-expansion and performs re-expansion through the above process.

The method of changing the electronic zoom region according to the present invention performed as above will be described in detail as follows.

First, the input image data is stored in the field memory (20), and the zoom magnification information is input from the microcomputer or the like to determine whether to execute the electronic zoom (21). Information about the position, that is, zoom region information, is received as an input (22), and a zoom region is determined (23). In this case, if the zoom area information is not input, the process proceeds directly to the image data output steps 24 and 25.

The zoom area thus determined is used to generate the read address of the field memory.

A read address is generated according to the zoom region determined in the zoom region determination step (24), and image data corresponding to the generated read address is read out from the field memory (25). The interpolated image data is output by interpolating the image data read from the field memory (26), and the interpolated image data, that is, the enlarged image, is contour-corrected to increase the resolution of the image (27).

In this way, it is determined whether the contour-corrected image data is to be stored in the field memory again for re-expansion, and the above processes 20 to 27 are repeated when re-storing for re-expansion.

4 is a configuration diagram of an electronic zoom region variable apparatus according to the present invention.

As shown in FIG. 4, the electronic zoom variable device according to the present invention includes the multiplexer 30, the field memory 31, the address generator 32, the luminance / color difference separator 33, the interpolator 34, and the contour corrector. And a luminance / color difference mixer 36.

The multiplexer 30 selects and outputs one of the input image data and the enlarged image data output from the luminance / color difference mixer 36.

The field memory 31 stores image data output from the multiplexer 30, and is composed of two memories, namely, a reading memory and a writing memory.

The address generator 32 controls the field memory 31 by generating a read / write address of the field memory 31 by inputting the system clock CK, the horizontal drive pulse HD, the zoom area information, and the zoom magnification information. do.

Here, the zoom area information is in the form of horizontal and vertical coordinate values.

The luminance / color difference separator 33 separates the luminance signal and the color difference signal from the image data output from the field memory 31.

The interpolator 34 interpolates the luminance signal and the chrominance signal output from the luminance / color difference separator 33, and interpolates the luminance signal output from the luminance / color difference separator 33 horizontally. 37), from the delay unit 39 for delaying the horizontal interpolated luminance signal output from the luminance horizontal interpolation unit 37 during horizontal synchronization, and the delayed luminance signal derived from the delay unit 39 and the luminance horizontal interpolation unit 37. Color difference horizontally interpolated horizontally with respect to the color difference signal output from the luminance vertical interpolation unit 38 and the luminance / color difference separator 33 that vertically interpolate the output horizontal interpolated luminance signal as an input to the contour corrector 35. The interpolator 40, the delay unit 42 for delaying the horizontal interpolated color difference signal output from the chrominance horizontal interpolation unit 40 during horizontal synchronization, and the delayed color difference signal and the chrominance horizontal interpolation output from the delay unit 42. It consists of a part 40 the chrominance vertical interpolator 41 for outputting a color difference signal horizontal interpolation to the luminance / chrominance mixer 36 by vertical interpolation to the input which is output from.

The contour corrector 35 corrects the contour by filtering the luminance signal output from the interpolator 34 to increase the resolution of the image, and is configured as a band pass filter.

The luminance / color difference mixer 36 mixes the contour-corrected back signal output from the contour corrector 35 and the interpolated color difference signal output from the interpolator 34 to form original image data and multiplexers for re-enlarging. Output to 30 and when the expansion is completed, output to the image.

The operation of the electronic zoom area variable apparatus according to the present invention configured as described above will be described.

The input image data is interpolated and enlarged to be input to the multiplexer 30 together with the image data output from the luminance / color difference mixer 36 to be selected.

Image data output from the multiplexer 30 is input to the field memory 31 and stored. At this time, the address generator 32 receives zoom area information on the zoom area input from the microcomputer in the form of horizontal and vertical coordinate values, and receives zoom magnification information on the zoom magnification. In this way, the zoom area information and the zoom magnification information output from the microcomputer are used to generate the read address for controlling the field memory 31 in the address generator 32.

Image data is output from the field memory 31 according to the read address generated from the address generator 32, and image data output from the field memory 31 is separated into a luminance signal and a color difference signal by the luminance / color difference separator 33. After the interpolation unit 34 interpolates horizontally and vertically, the luminance signal and the color difference signal are enlarged.

The interpolator 34 and the interpolation process will be described in detail.

The luminance signal output from the luminance / color difference separator 33 is interpolated horizontally in the luminance horizontal interpolator 37 and then input to the luminance vertical interpolator 38 and the delay unit 39. The delay unit 39 inputs the luminance signal interpolated in the luminance horizontal interpolation unit 37 and enlarged horizontally to the luminance vertical interpolation unit 38 after the horizontal drive pulse delays the input synchronization during horizontal synchronization (1H). . The luminance vertical interpolation unit 38 interpolates the horizontal interpolated luminance signal output from the luminance horizontal interpolation unit 37 and the delayed horizontal interpolated luminance signal output from the delay unit 39 vertically, and performs horizontal and The luminance signal magnified vertically is output to the contour corrector 35.

In addition, the color difference signal output from the luminance / color difference separator 33 is horizontally interpolated by the color difference horizontal interpolator 40 and then input to the color difference vertical interpolator 41 and the delay unit 42. The delay unit 42 delays the color difference signal interpolated and horizontally enlarged by the color difference horizontal interpolation unit 40 during the horizontal synchronization (1H) where the horizontal drive pulse is input, and then inputs the color difference signal to the color difference vertical interpolation unit 41 again. In the color difference vertical interpolation unit 41, horizontal interpolation is performed by inputting horizontal interpolated color difference signals output from the color difference horizontal interpolation unit 40 and delayed horizontal interpolated color difference signals output from the delay unit 42. A vertically enlarged color difference signal is output to the luminance / color difference mixer 36.

The enlarged luminance signal is contour-corrected by the contour corrector 35 to increase the resolution of the image, and then mixed by the luminance / color difference mixer 36 to produce the original image signal. That is, in the luminance / color difference mixer 36, the enlarged color difference signal output from the chrominance vertical interpolation unit 41 and the contour corrected luminance signal output from the contour corrector 35 are mixed as inputs to form an original image signal.

Finally, the enlarged image signal output from the luminance / chromatic mixer 36 is determined whether or not to repeat the interpolation process and is output to the multiplexer 30. That is, when the interpolation process is repeated to further enlarge the interpolation process, the image signal output from the luminance / color difference mixer 36 is selected by the microcomputer in the multiplexer 30 and stored in the field memory 31. .

Next, the detailed configuration and operation of the address generator 32 of FIG. 4 will be described with reference to FIG.

FIG. 5 is a detailed block diagram of the address generator 32 of FIG.

The address generator 32 which generates the diary / write address of the field memory 31 from the zoom area information and the zoom magnification information transmitted from the microcomputer is counted horizontally by counting the system clock CK as an input as shown in FIG. Horizontal address counter 50 for generating address, vertical address counter 51 for generating vertical address by counting horizontal drive pulse (HD) as input, zoom area start horizontal address by inputting zoom ratio information and zoom area horizontal coordinate Zoom start horizontal address generator 52 for generating a zoom start information and zoom start vertical address generator 53 for generating a zoom area start vertical address by inputting zoom magnification information and zoom area vertical coordinates. A multiplexer 54 which selects one of the outputs of the address counter 51 and outputs it as a write address, an adder 55 which adds the outputs of the zoom start horizontal address generator 52 and the horizontal address counter 50, The multiplexer 57 which selects one of the outputs of the adder 56 and the outputs of the adders 55 and 56 to add the outputs of the start vertical address generator 53 and the vertical address counter 51 and outputs the read address to the read address, is input. The multiplexer 58 selects one of a write address and a read address output from the multiplexers 54 and 57 according to the field separation signal FLD, and outputs the result to one memory, and the multiplexer according to the input field separation signal FLD. The multiplexer 59 selects one of a write address and a read address output from (54, 57) and outputs it to the other memory.

Here, the zoom start horizontal address generator 52 may include the zoom start horizontal address generator 60 that generates the zoom start horizontal address according to the zoom magnification information, and the zoom start horizontal address generator 60 that is output from the zoom start horizontal address generator 60. And an adder 61 for outputting the zoom region start horizontal address by adding the input zoom region horizontal coordinates.

In addition, the zoom start vertical address generator 53 may include a zoom start vertical address generator 62 generating a zoom start vertical address according to the zoom magnification information, and a zoom start vertical address output from the zoom start vertical address generator 62. And an adder 63 which adds an input zoom region vertical coordinate and outputs a zoom region start vertical address.

The operation of the address generator 32 configured in this way will be described.

The horizontal address counter 50 generates a horizontal address by counting the number corresponding to the horizontal pixels of the image by inputting the system clock CK of the system. The vertical address counter 51 uses the horizontal drive pulse as an input. A vertical address is created by counting the number of vertical lines in.

Meanwhile, the zoom start horizontal address and the zoom start vertical address are generated by the zoom start horizontal address generator 60 and the zoom start vertical address generator 62 by the zoom magnification information input from the microcomputer.

The zoom start horizontal address generator 60 and the zoom start vertical address generator 62 are as follows.

Zoom start horizontal address: WIDTH / 2 {1- (1 / zoom ratio)}

Zoom start horizontal address: HEIGHT / 2 {1- (1 / zoom)}

Here, WIDTH means the width of the object to be enlarged, and HIGHT means the height of the object to be enlarged.

In this way, the zoom start address generated by the zoom start horizontal / vertical address generators 60 and 62 is added to the zoom area horizontal / vertical information input from the microcomputer, that is, the zoom area horizontal / vertical coordinates and the adders 61 and 63, respectively. It is finally added as the read address of the field memory 31 by adding it with the horizontal / vertical address generated by the horizontal / vertical counters 50 and 51 afterwards.

On the other hand, in the multiplexer 54, the output of the horizontal / vertical counters 50 and 51 is input to generate the write address of the horizontal / vertical field memory 31. In addition, in the multiplexer 57, the horizontal / vertical address generated by the zoom magnification information and the zoom area information and output from the adders 55 and 56 is input to generate the read address of the field memory 31.

The write address and read address which are selected and output from the multiplexers 54 and 57 are used as the write addresses and read addresses of the two memories of the field memory 31, namely, the field memory 1 and the field memory 2.

That is, the write address and the read address are read and written in the field memory 1 and the field memory 2 by the field division signal FLD. In other words, when processing a video signal using the field memory, the read memory and the write memory must exist separately, and when one memory is in the read state, the other memory must be in the write state. The multiplexer 58 selects a write address, and the multiplexer 59 selects a read address, respectively, and outputs them to the address terminals of the field memory 1 and the field memory 2.

6 is an image enlarged state diagram in an arbitrary area according to the present invention.

As shown in FIG. 6, when electronic zooming is performed in an arbitrary area, information about the zoom area may be divided into horizontal coordinates and vertical coordinates.

In other words, when the zoom area selected by the user is read by the microcomputer and the starting coordinate of the zoom area is transmitted to the electronic zoom area variable device, the zoom area is used to generate the read address of the field memory, thereby using only the field memory and its address control. Simple to implement.

In addition, the first magnified image data is stored in the field memory 31 again as shown in FIG. 6, and the second magnified image data is obtained through the interpolation process to obtain the second magnified image data. The zoom function can be implemented.

As described above, the present invention can enlarge the object to be enlarged at any position other than the center of the screen when the screen is enlarged. When playing a tape in the VTR, the object displayed at the upper left corner of the screen is interpolated. It can be usefully applied when you want to enlarge and observe the desired object by electronic zoom.

Claims (5)

A first multiplexer 30 for selecting and outputting one of input image data and enlarged image data, a field memory 31 for storing image data output from the first multiplexer 30, a system clock CK, The address generator 32 and the field memory which control the field memory 31 by generating a read / write address of the field memory 31 by inputting horizontal drive pulses HD, zoom area information, and zoom magnification information. A luminance / color difference separator 33 for separating the luminance signal and the chrominance signal from the image data output from (31), and an interpolator 34 for interpolating the luminance signal and the color difference signal output from the luminance / color difference separator 33. Contour corrector 35 to correct the contour by filtering the luminance signal output from the interpolator 34 in order to increase the resolution of the image, and the contour corrected brightness output from the contour corrector 35 And a luminance / color difference mixer 36 for mixing the signal and the interpolated color difference signals output from the interpolator 34 to form original image data and outputting them to the first multiplexer 30 for re-expansion. An electronic zoom region variable device, characterized in that. The apparatus of claim 1, wherein the zoom region information is formed in the form of horizontal and vertical coordinate shades. 2. The interpolator (34) according to claim 1, wherein the interpolator (34) outputs from the luminance horizontal interpolator (37) and the luminance horizontal interpolator (37), which interpolate horizontally with respect to the luminance signal output from the luminance / color difference separator (33). A first delay unit 39 for delaying the horizontal interpolated luminance signal during horizontal synchronization, a delayed luminance signal output from the first delay unit 39 and a horizontal interpolated luminance signal output from the luminance horizontal interpolation unit 37 Is interpolated vertically as an input, and the luminance vertical interpolation unit 38 outputs to the contour corrector 35, and the chrominance horizontal interpolation unit 40 interpolating horizontally with respect to the color difference signal output from the luminance / color difference separator 33. A second delay unit 42 for delaying the horizontal interpolated color difference signal output from the chrominance horizontal interpolation unit 40 during horizontal synchronization, and a delayed color difference signal and chrominance horizontal interpolation output from the second delay unit 42. Exit from the executive 40 And a chrominance vertical interpolation portion (41) for vertically interpolating the output horizontal interpolated chrominance signal as an input and outputting the chrominance / color difference mixer (36). 3. The device of claim 2, wherein the field memory (31) consists of two memories. 5. The address generator of claim 4, wherein the address generator 32 counts the system clock CK as an input to generate a vertical address by counting an input of a horizontal address counter 50 and a horizontal drive pulse HD. The vertical address counter 51 to input the zoom magnification information and the zoom area horizontal coordinates to start the zoom start horizontal address generating unit 52 to generate the horizontal address, the zoom start information to the zoom magnification information and the zoom area vertical coordinates. Zoom start generating the address The vertical address generator 53, the second multiplexer 54 which selects one of the outputs of the horizontal address counter 50 and the vertical address counter 51 and outputs the write address, the zoom start A first adder 55 for adding the outputs of the horizontal address generator 52 and the horizontal address counter 50, and a second adder for adding the outputs of the zoom start vertical address generator 53 and the vertical address counter 51; Adder 56, the first and second A third multiplexer 57 which selects one of the outputs of the diffusers 55 and 56 and outputs the read address, and is output from the second and third multiplexers 54 and 57 according to the input field discrimination signal FLD. A fourth multiplexer 58 that selects one of a write address and a read address, and outputs the same to one memory; and outputs from the second and third multiplexers 54 and 57 according to the input field discrimination signal FLD Select one of write address and read address.