JP2000307943A - Electronic zoom device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic zoom device which can output an enlarge image of high picture quality corresponding to a video signal of a sequential scanning system and a video signal of an interlaced scanning system and which consumes less power. SOLUTION: The electronic zoom device is equipped with a magnifying power setting circuit 107 for electronic zoom, a coefficient generating circuit 108 which generates a coefficient according to magnification, an interpolative operation circuit 105 which performs interpolative operation corresponding to the coefficient, a series-parallel converting means 101 which parallelizes input signals, field memories 102 and 103 which store the resultant signals, a signal selecting circuit 104 which selects an input to the interpolative operation circuit 105, and a memory control circuit 106 for the field memories 102 and 103. The choice of the selecting circuit 104 is changed according to the coefficient to control the memory control circuit 106.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic zoom apparatus for enlarging a video signal of an interlaced scanning system or a progressive scanning system at an arbitrary magnification and outputting the signal in an interlaced scanning system.

[0002]

2. Description of the Related Art As a conventional electronic zoom device, there is one disclosed in, for example, Japanese Patent Application Laid-Open No. 2-109474, "Image Memory Device". These assume an interlaced scanning video signal as an input video signal. However, in recent years, a solid-state imaging device (hereinafter, referred to as a CCD) or the like that can output a progressive scanning video signal has been used in digital cameras and the like, and the progressive scanning video signal is zoomed and then displayed on a television. For this purpose, an electronic zoom device for converting the video signal into an interlaced video signal and outputting the video signal has been devised. As a device equipped with such an electronic zoom device, there is, for example, Japanese Patent Application Laid-Open No. 5-26047 "Television Receiver". Hereinafter, a conventional electronic zoom apparatus in which a progressive scanning video signal is input and an interlaced video signal is output will be described with reference to the drawings.

FIG. 16 is a block diagram showing a basic configuration of a conventional electronic zoom apparatus for performing an enlarged zoom in the vertical direction. First, the input video signal S1 is written into a frame memory 1601 that can store an image for one field of a progressive scanning video signal, that is, one frame of an interlaced scanning video signal. Here, the input video signal S1
Is a digital video signal obtained by converting, for example, a progressive scanning analog video signal output from a progressive scanning CCD by an analog-digital converter (hereinafter, A / D converter) or the like. The signal read from the frame memory 1601 is supplied to an interpolation operation circuit 1603 and a one-line cycle (hereinafter referred to as 1
The data is input to the first-stage line memory of the plurality of line memories 1602 having the delay time of H). The output from each line memory 1602 is also calculated by the interpolation arithmetic circuit 1603.
Is input to The interpolation calculation circuit 1603 is provided with an interpolation coefficient generation circuit 16 based on the magnification m set by the magnification setting circuit 1607.
Interpolation operation is performed on the input signal using the interpolation coefficient w generated by 06, and a video signal S2 is output. The interlace conversion circuit 1604 converts the progressive scanning video signal S2 into an interlaced scanning video signal S3 and outputs it. The memory control circuit 1605 controls addresses for reading and writing signals to and from the frame memory 1601 according to the value of the coefficient w.
02 to control the read control signal CTRL to be output to the control signal 02.
The clock generator 1608 is connected to the line memory 160
2, interpolation operation circuit 1603, interlace conversion circuit 16
04, memory control circuit 1605, interpolation coefficient generation circuit 16
06, the clock CL input to the magnification setting circuit 1607
K1 generates a clock CLK2 input only to the interlace conversion circuit 1604.

Here, the frequency of the clock CLK1 is equal to the horizontal pixel sampling frequency of the input video signal S1 of the progressive scanning system, and the frequency of the clock CLK2 is equal to the horizontal pixel sampling frequency of the output video signal S3 of the interlaced scanning system. . Comparing the number of lines in one field period, the frequency of the clock CLK1 is twice the frequency of the clock CLK2 because the number of lines in the progressive scanning method is twice that in the interlacing method.

[0005] The interpolation operation performed by the interpolation operation circuit 1603 is represented by sin which appears in the sampling theorem as an interpolation function.
It is desirable to interpolate using πx / πx and based on an infinite number of pixels. However, since it is not possible to use an infinite number of line memories, it is actually impossible to perform interpolation. For example, a linear interpolation method or a cubic convolution interpolation method is used. In the linear interpolation method, if an interpolation pixel is y, pixels before and after y are x _i , x _{i + 1} , and an interpolation coefficient is w, the interpolation function L (x) is L (x) = 1− | x | , 0 ≦ | x | <1 L (x) = 0, where | x | ≧ 1 (Equation 1), and the interpolation pixel y is expressed by the following equation from the interpolation function L (x).

Y = L (w) x _i + L (1-w) x _{i + 1} (Equation 2) In the cubic convolution interpolation method, sin is used as an interpolation function q (x).
Approximate cubic expression of πx / πx q (x) = 1-2 | x | ² + | x | ³ where 0 ≦ | x | <1 q (x) = 4-8 | x | +5 | x | ² − | X | ³ where 1 ≦ | x | <2 q (x) = 0, where | x | ≧ 2 (Equation 3) and the interpolation pixel is located at y and before and after the interpolation pixel y. the four pixels _{x i-1, x i,} x i + 1, x i + 2, the interpolation coefficients a w, y = q (1 + w) x i-1 + q (w) x i + q (1- w) x _{i + 1} + q (2-w) x _{i + 2} (Expression 4)

FIG. 17 shows an example in which the zoom operation performed by the electronic zoom apparatus having the configuration shown in FIG. 16 is enlarged to 4/3 times.
This will be described with reference to FIG. First, FIG. 17 shows an enlarged zoom operation when the linear interpolation method is used as the interpolation calculation method. In this case, the four lines k,
From k + 1, k + 2, k + 3, five interpolation lines k ′,
(K + 1) ', (k + 2)', (k + 3) ', (k +
4) ′, if the line interval before enlargement is set to 1, the line interval after enlargement becomes 3/4, and the image becomes 4/3 times larger than before enlargement. The pre-enlargement image is stored in a frame memory 16 as an input video signal S1 of a progressive scanning method.
01, and then the memory control circuit 16
By the control of 05, the horizontal line is read out twice in four times corresponding to the magnification of 4/3. Also,
The line memory 1602 also performs write stop and read twice, once every four times, according to the signal CTRL output from the memory control circuit 1605 at the timing of read twice from the frame memory 1601. The interpolation calculation circuit 1603 allows the interpolation coefficient generation circuit 1606 to apply 0, 3/4, 1/2, 1/4 to the line read from the frame memory 1601 and the line delayed by the line memory 1602 in accordance with the magnification.
Is performed using the generated interpolation coefficient w, and the interpolation line is output as the video signal S2 of the progressive scanning method.

[0008] The interlace conversion circuit 1604 outputs k ', (k + 2)',
The lines of (k + 4) ', (k + 6)', (k + 8) ', and (k + 1)', (k + 3) ',
By outputting the (k + 5) 'and (k + 7)' lines, an interlaced scanning video signal S3 in which the progressive scanning input video signal S1 is enlarged in the vertical direction is obtained.

Here, the interpolation operation of the line in the enlargement zoom operation is equivalent to the vertical filtering. In general, however, the sampling frequency of the vertical line of the progressive scanning video signal is the same as the sampling frequency of the vertical line of the interlaced scanning video signal. Therefore, the enlarged image by the conventional electronic zoom device that performs the enlargement zoom on the input signal of the progressive scanning method is larger than the enlarged image of the electronic zoom device that performs the enlargement zoom on the input video signal of the interlace scanning method , A high-quality enlarged image with higher frequency components left.

In the above conventional example, the input is a progressive scanning video signal. However, an interlaced scanning video signal is also obtained by synchronizing an odd field image and an even field image and performing double speed conversion. It can be converted to a progressive scanning method. In such a case, if the input video signal of the interlaced scanning method is an image in which there is no motion between odd and even fields, for example, a still image or a still image continuously shot image in which movement occurs every two fields, the input is a sequential scanning method. It is possible to obtain an enlarged image having the same image quality as.

FIG. 18 shows a zoom operation when the cubic convolution interpolation method is used as the interpolation operation method. In the linear interpolation method, one line is interpolated from two lines before and after it, whereas in this case, four lines are interpolated before and after. For example, the (k + 2) ′ line is interpolated by the cubic convolution interpolation method as shown in (Equation 4) using the k, k + 1, k + 2, and k + 3 lines. Other operations are the same as those in the case of using the linear interpolation method, and a description thereof will be omitted.

[0012] In the interpolation using the cubic convolution interpolation method, the level of the high-frequency component is lower than that in the interpolation using the linear interpolation method. Obtainable.

[0013]

However, the above-mentioned conventional electronic zoom apparatus has the following problems. That is, the input video signal S1 of the progressive scanning system is converted to the progressive scanning system after converting the input video signal of the interlaced scanning system into the progressive scanning system. In order to convert to the interlaced scanning method after obtaining the post-image S2, all circuits from the sequential scanning input to obtaining the enlarged image S2 are clock CL.
If the input video signal of the interlaced scanning system is operated at K1 and the enlargement zoom is to be performed without changing the system, it is only necessary to operate with the clock CLK2, but it is necessary to use a clock having a double frequency. There is.

In general, the power consumed by a digital circuit is proportional to the frequency of a clock for driving the circuit and the circuit scale. Therefore, the above-described electronic zoom apparatus performs zoom processing on an interlaced scanning video signal. The power consumption is greatly increased as compared with the electronic zoom device.

An object of the present invention is to solve the above-mentioned conventional problems and to output a high-quality enlarged image equivalent to a conventional electronic zoom device for a video signal of a progressive scanning system or a video signal of an interlaced scanning system. It is an object of the present invention to provide an electronic zoom device that can reduce power consumption significantly compared to the related art.

[0016]

According to a first aspect of the present invention, there is provided an electronic zoom apparatus comprising: a magnification setting means for providing a magnification for enlarging an electronic zoom; a coefficient generation means for generating a coefficient according to the magnification;
Interpolation operation means for performing an interpolation operation according to a coefficient generated by a coefficient generation means on an input signal, serial-to-parallel conversion means for performing parallelization on an input signal sequentially input, and a signal from the serial-to-parallel conversion means And a signal selecting means for selecting an input to the interpolation operation means from an output of the storage means, and a read / write control means for controlling writing and reading to and from the storage means, wherein a coefficient generated by the coefficient generating means is provided. The signal selected by the signal selection means is changed in accordance with the above, and the read / write control means performs read / write control.

According to the electronic zoom device of the first aspect,
For example, for an input video signal of a progressive scanning method, an interpolation line is output using each line and its adjacent line, that is, an enlarged image can be output.
It is possible to obtain a high-quality enlarged image equivalent to an electronic zoom device that inputs a progressive scanning video signal, and since most of the circuits in the device can operate with a clock that is half the frequency of the conventional one, there is a great deal of Power consumption can be reduced.

According to a second aspect of the present invention, in the electronic zoom apparatus according to the first aspect, the storage means includes two storage means capable of performing independent read / write control.

According to the electronic zoom device of the second aspect,
This has the same effect as the first aspect.

According to a third aspect of the present invention, in the electronic zoom apparatus according to the first or second aspect, the signal selected by the signal selecting means is a value a (where 0 ≦ a <1) having a coefficient generated by the coefficient generating means. Change the signal to select when exceeds
The read / write control performed by the read / write control means changes when the coefficient generated by the coefficient generation means changes from increasing to decreasing or when the coefficient exceeds a certain value a.

According to the electronic zoom device of the third aspect,
There is an effect similar to that of claim 1 or claim 2.

According to a fourth aspect of the present invention, there is provided an electronic zoom apparatus, wherein a magnification setting means for providing a magnification of the electronic zoom, a coefficient generation means for generating a coefficient according to the magnification, and a coefficient generation means for generating an input signal. Interpolation operation means for performing an interpolation operation according to a coefficient, first signal selection means for sequentially switching input signals sequentially input to a plurality of output units, and storing each signal selected by the first signal selection means Memory means, a second signal selection means for selecting an input to the interpolation operation means from an output of the storage means, and a read / write control means for controlling writing and reading to and from the storage means. The signal selected by the second signal selection means is changed according to the coefficient, and the read / write control means performs read / write control.

According to the electronic zoom device of the fourth aspect,
2. A high image quality equivalent to that of the electronic zoom apparatus according to claim 1, for example, when the input video signal is an image in which there is no motion between odd and even fields, for example, a still image or a still image continuously shot image in which motion occurs every two fields. Can be obtained, and the power consumption can be reduced.

According to a fifth aspect of the present invention, in the electronic zoom device according to the fourth aspect, the storage means includes two storage means capable of performing independent read / write control.

According to the electronic zoom device of the fifth aspect,
There is an effect similar to that of the fourth aspect.

According to a sixth aspect of the present invention, in the electronic zoom device according to the fourth or fifth aspect, the signal selected by the second signal selection means is a value a having a coefficient generated by the coefficient generation means.
(However, the signal to be selected when the value exceeds 0 ≦ a <1) is changed, and the read / write control performed by the read / write control unit is performed when the coefficient generated by the coefficient generation unit changes from increasing to decreasing or exceeds a certain value a. It changes from time to time.

According to the electronic zoom device of the sixth aspect,
There is an effect similar to that of claim 4 or claim 5.

According to a seventh aspect of the present invention, there is provided an electronic zoom apparatus, wherein a magnification setting means for providing a magnification of the electronic zoom, a coefficient generation means for generating a coefficient in accordance with the magnification, and a coefficient generation means for generating an input signal. An interpolation operation means for performing an interpolation operation according to a coefficient, a serial-to-parallel conversion means for performing parallelization on input signals sequentially input, a storage means for storing a signal from the serial-to-parallel conversion means, A plurality of delay means for delaying the signal of the predetermined period, a signal selection means for selecting an input to the interpolation operation means from an output of the storage means and an output of the delay means, and controlling writing and reading to and from the storage means and the delay means. Read / write control means,
According to another feature of the present invention, the signal selected by the signal selection unit is changed according to the coefficient generated by the coefficient generation unit, and the read / write control unit performs read / write control.

According to the electronic zoom device of the seventh aspect,
For example, for an input video signal of the progressive scanning method, three lines are used using a total of four lines of each line and three adjacent lines.
The interpolation line can be output using the next convolution interpolation method, so that an enlarged image with higher image quality can be obtained.

According to an eighth aspect of the present invention, in the electronic zoom device according to the seventh aspect, the storage means includes two storage means capable of performing independent read / write control.

According to the electronic zoom device of the eighth aspect,
There is an effect similar to that of the seventh aspect.

According to a ninth aspect of the present invention, in the electronic zoom apparatus according to the seventh or eighth aspect, the signal selected by the signal selecting means is a value a (where 0 ≦ a <1) where a coefficient generated by the coefficient generating means is present. Change the signal to select when exceeds
The read / write control performed by the read / write control means changes when the coefficient generated by the coefficient generation means changes from increasing to decreasing or when the coefficient exceeds a certain value a.

According to the electronic zoom device of the ninth aspect,
There is an effect similar to that of the seventh or eighth aspect.

According to a tenth aspect of the present invention, there is provided an electronic zoom apparatus, wherein a magnification setting means for providing a magnification of the electronic zoom, a coefficient generation means for generating a coefficient in accordance with the magnification, and a coefficient generation means for generating an input signal. Interpolation calculating means for performing an interpolation calculation according to a coefficient, first signal selecting means for sequentially switching input signals sequentially input to a plurality of output units,
Storage means for storing each signal selected from the signal selection means, a plurality of delay means for delaying the signal from the storage means for a certain period, and an input to the interpolation operation means, an output of the storage means and an output of the delay means And a read / write control unit that controls writing and reading to and from the storage unit and the delay unit, and the second signal selection unit is selected according to the coefficient generated by the coefficient generation unit. And the read / write control means performs read / write control.

According to the tenth aspect of the present invention, for example, when the input video signal is an image in which there is no motion between odd and even fields, for example, a still image, or a still image continuously shot in which motion occurs every two fields For example, it is possible to obtain a high-quality enlarged image equivalent to that of the electronic zoom device according to claim 7 and reduce power consumption.

According to an eleventh aspect of the present invention, in the electronic zoom device according to the tenth aspect, the storage means includes two storage means capable of performing independent read / write control.

According to the electronic zoom device of the eleventh aspect, the same effect as that of the tenth aspect can be obtained.

According to a twelfth aspect of the present invention, in the electronic zoom device according to the tenth or eleventh aspect, the signal selected by the second signal selection means is a value a (where 0 ≦ 0) having a coefficient generated by the coefficient generation means. The signal selected when a <1) is exceeded is changed, and the read / write control performed by the read / write control means is changed when the coefficient generated by the coefficient generation means changes from increasing to decreasing or exceeds a certain value a. .

According to the electronic zoom apparatus of the twelfth aspect, the same effect as that of the tenth or eleventh aspect can be obtained.

[0040]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 is a block diagram illustrating a basic configuration of an image processing apparatus to which an electronic zoom apparatus according to a first embodiment of the present invention is applied. In FIG. 1, reference numeral 101 denotes a serial / parallel conversion circuit as serial / parallel conversion means for parallelizing and outputting a two-line unit with respect to an input video signal S1 of a progressive scanning method.
Reference numeral 03 denotes a field memory as storage means for storing the parallelized video signals S2a and S2b, 104 denotes signals S4a and S4b to the interpolation operation circuit 105, and output signals S3 from the field memories 102 and 103, respectively.
a signal selection circuit as signal selection means for selecting from a and S3b. Reference numeral 105 denotes an interpolation calculation circuit as interpolation calculation means for performing interpolation calculation from output signals S4a and S4b from the signal selection circuit 104;
A memory control circuit as read / write control means for controlling writing and reading of signals to and from 103, a magnification setting circuit 107 as magnification setting means for setting a magnification m of the electronic zoom, and 108 based on the magnification m set at 107 A control coefficient generating circuit as a coefficient generating means for generating a control coefficient k by using
Is an interpolation coefficient calculation circuit that calculates an interpolation coefficient w when performing an interpolation operation, and 110 is a clock generator that generates a clock CLK1 and a clock CLK2 supplied to each circuit of the present apparatus.

FIG. 2 shows the serial / parallel conversion circuit 1 shown in FIG.
It is a block diagram which shows the specific example of a structure of No. 01. In the figure, reference numerals 202 and 203 denote line memories, and 201 denotes an input video signal S1 for each line by a line memory 202 or 2
03, a selector for distributing to the line memory 204;
A write control circuit for controlling the writing of
A read control circuit 05 controls reading of the line memories 202 and 203. Line memories 202 and 20
3, writing is performed in synchronization with the clock CLK1, and reading is performed in synchronization with the clock CLK2.

FIG. 3 is a block diagram showing a specific configuration example of the interpolation operation circuit 105 shown in FIG. In the figure, reference numeral 301 denotes a coefficient calculation circuit for calculating a coefficient to be multiplied by the multipliers 302a and 302b based on the interpolation coefficient w given from the interpolation coefficient calculation circuit 109, and reference numerals 302a and 302b denote output signals S4a and S4b from the signal selection circuit 104. A multiplier 303 multiplies the coefficient calculated by the coefficient calculation circuit 301. An adder 303 adds the output signals from the multipliers 302a and 302b and outputs the result as an output video signal S5.

The input video signal S1 is a digital video signal scanned sequentially, for example, a video signal obtained by converting an analog video signal from a progressive scanning CCD into a digital signal by an A / D converter can be considered. Also, the clock CLK
The frequency 1 is a digital video signal S which is a progressive scanning system.
1 horizontal pixel sampling frequency and clock C
The frequency of LK2 is equal to the horizontal pixel sampling frequency of the interlaced scanning digital video signal S5 output from the apparatus. Comparing the number of lines in one field period, the number of lines in the progressive scanning method is twice that in the interlacing method.
It is twice the frequency of LK2.

The operation of the electronic zoom device of the first embodiment configured as described above will be described below.

First, the input video signal S1 is input to the serial / parallel conversion circuit 101, and is converted into parallel signals in units of two lines and output as signals S2a and S2b. FIG. 4 is a schematic diagram illustrating the operation of the serial / parallel conversion circuit 101. Video signal S1 input in synchronization with progressive scanning horizontal synchronization signal HD1
, Lines 0, 1, 2, 3, 4, and 5 are sorted for each line by a selector 201 in the serial / parallel conversion circuit 101, and odd lines 1, 3, and 5 are assigned to a line memory 202.
The even lines 0, 2, and 4 are written to the line memory 203. Then, under the read control of the read control circuit 205, the lines 0 and 1, the lines 2 and 3, and the lines 4 and 5 are controlled so as to be output simultaneously, and the signal synchronized with the interlace scanning horizontal synchronization signal HD2 It is output as S2a and S2b. That is, the odd lines 1, 3, 5 are the signal S2a and the even lines 0, 2, 4,
Is the signal S2b. At this time, the writing of the signal to the line memory is performed in synchronization with the clock CLK1, and the reading is performed in synchronization with the clock CLK2.

The converted video signals S2a and S2b are written in the field memories 102 and 103, respectively.
The memory control circuit 106 controls the control coefficient generation circuit 108
Is generated based on the control coefficient k generated by the
Video signals S3a and S3b are read out by performing independent readout control on 2 and 103. Here, assuming that the magnification set by the magnification setting circuit 107 is m, the control coefficient k adds 1-1 / m to a certain initial value a (a ≧ 0) every 1H inside the control coefficient generation circuit 108. Is output as a result of If the control coefficient k at a certain timing is smaller than k before 1H, the memory control circuit 106
If the control coefficient k at a certain timing is 0.5 or more and k before 1H is less than 0.5, the memory control circuit 106 controls the field memory 102 Is controlled twice.

The signal selection circuit 104 has two signal selection states according to the control coefficient k. FIG. 5 is a diagram illustrating a signal selection state taken by the signal selection circuit 104.

In the signal selection state 1, the field memory 10
The video signal S3a read out from the second
5, the video signal S3b read from the field memory 103 is input to the input S4a of the interpolation arithmetic circuit 105.
The signal is selected so as to be b. In the signal selection state 2, the video signal S3 read from the field memory 102
Signal selection is performed so that “a” becomes the input S4b of the interpolation arithmetic circuit 105 and the video signal S3b read from the field memory 103 becomes the input S4a of the interpolation arithmetic circuit 105.

The signal selection circuit 104 enters the selection state 1 when the value of the control coefficient k is less than 0.5, and enters the selection state 2 when the value of the control coefficient k is 0.5 or more.

Then, the interpolation operation circuit 105 performs a linear interpolation operation on the input signals S4a and S4b. That is,
Signals S4a and S4b are input to multipliers 302a and 302b, and interpolation coefficient w output from interpolation coefficient calculation circuit 109.
The coefficients are multiplied by the coefficients w and 1-w obtained by the coefficient calculation circuit 203 based on (0 ≦ w <1), and the multiplication result is added to the adder 303.
And output as an output video signal S5. The interpolation coefficient calculation circuit 109 doubles the input control coefficient k, and outputs the decimal part as an interpolation coefficient w.

Hereinafter, the electronic zoom operation performed by the present apparatus will be described in more detail with reference to the drawings.

FIG. 6 schematically shows the zoom operation performed by the present apparatus, taking as an example a case where the magnification m = 5/3. First, a zoom operation in an odd field will be described.

FIG. 7 shows a line read from the field memories 102 and 103 and a control coefficient k during the zoom operation.
It summarizes the generation of the interpolation coefficient w and the interpolation calculation. At the time of an odd field, the control coefficient generation circuit 108
Adds (1-1 / m) = 2/5 to the initial value a = 0, and sets the control coefficient k to 0, 2/5, 4/5, 1/5, 3 /
It occurs like 5,0. The interpolation coefficient calculation circuit 107
Calculates the interpolation coefficient w from 0, 4/5, 3/5, and the control coefficient k.
It is generated as 2/5, 1/5, 0.

The input video signal S1 is converted into S2a and S2b by the serial / parallel conversion circuit 101, and is simultaneously written into the field memories 102 and 103, respectively.
When reading the written video signal, first, a line is read as the signal S3a and a line ′ is read as the signal S3b under the control of the memory control circuit 106. At this time, since the control coefficient k is 0, the signal selection circuit 104 is in the selected state 1, and the line is set to the signal S4b as the signal S4a.
Output line '. And an interpolation operation circuit 1
05 performs an interpolation operation of (1-0) × + 0 × ′ = from the signals S4a and S4b using the interpolation coefficient w = 0,
The interpolated line (a) is output as an output video signal S5.

Next, under the control of the memory control circuit 106,
Read line, '. Control coefficient k = 2/5 <1 /
2, the signal selection circuit 104 remains in the signal selection state 1 and the interpolation operation circuit 105 outputs the interpolation coefficient w = 4/5
Using (1/4/5) × + (4/5) × ′ =
(1/5) × + (4/5) × '
Output the interpolated line (b).

Next, when a signal is read from the field memory, the control coefficient k = 4/5, and k = 1/5 before 1H.
Since it is 2/5, the memory control circuit 106 controls the field memory 102 to read twice, and reads the line again. Normal read control is performed on the field memory 103 to read the line '. Since the control coefficient k = 4/5 ≧ 1/2, the signal selection circuit 10
4 becomes the signal selection state 2, and the interpolation calculation circuit 105 uses the interpolation coefficient w = 3/5 to obtain (3/5) × + (1-3 /
5) Perform an interpolation operation of x '= (3/5) x + (2/5) x', and output the interpolated line (c).

Next, when a signal is read from the field memory, the control coefficient k becomes 1/5, and k = 1H before.
Since it is 4/5, the memory control circuit 106 controls the field memory 103 to read twice, and reads the line ′ again. Normal read control is performed on the field memory 102 to read a line. Since the control coefficient k = 1/5 <1/2, the signal selection circuit 1
04 again becomes the signal selection state 1 and the interpolation operation circuit 105
Is obtained by using an interpolation coefficient w = ２, and (1-2 / 5) × +
(1/5) × '= (3/5) × + (2/5) ×'
And outputs the interpolated line (d). Hereinafter, by repeating the same operation, interpolation lines (e), (f), and (g) are output.

Next, the operation in the even field will be described. FIG. 8 summarizes the lines read from the field memory, the generation of the control coefficient k and the interpolation coefficient w, and the interpolation calculation in the operation in the even field. In this case, the control coefficient generation circuit 108 sets the initial value a ′ =
Using (1-1 / m) / 2 + 1/2 = 7/10, the control coefficient k is generated as shown in FIG. Further, the interpolation coefficient calculation circuit 109 generates an interpolation coefficient w from the control coefficient k as shown in FIG. Using these control coefficients k and interpolation coefficients w, interpolation lines (a) ′, (b) ′,
The operation of outputting (c) ', (d)', (e) ', (f)', and (g) 'is the same as in the case of the odd-numbered field, and will not be described. The interpolation lines in the even field output in this manner are the interpolation lines (a), (b), (c), (d), (e), (f),
(G) and interlace relationship. Further, if the line interval of the input video signal S1 of the progressive scanning method is 1, the interval between the interpolated lines combining the odd and even fields is 3/5, and the image is 5 times larger than before the enlargement.
The output video signal S5 is a video signal of the interlaced scanning system, whereas the input is a video signal of the progressive scanning system.

By the above operation, an interpolation line is output using the sequential lines and the adjacent lines, that is, an enlarged image is output with respect to the input video signal S1 of the sequential scanning method. It is possible to obtain a high-quality enlarged image equivalent to that of an electronic zoom device that receives a conventional progressive-scan video signal. Furthermore, in this device, the series /
All circuits after the parallel conversion circuit 101 are clock CLK2.
, The power consumption can be significantly reduced as compared with a conventional electronic zoom apparatus in which most circuits operate at a clock CLK1 having a frequency twice as high as CLK2.

(Second Embodiment) FIG. 9 is a block diagram illustrating a basic configuration of a main part of an electronic zoom apparatus according to a second embodiment of the present invention. In FIG. 9, the same reference numerals are given to the same functional blocks as those in FIG. 1 of the first embodiment, so that detailed description of the blocks will be omitted. Reference numeral 901 denotes a video signal S1 for each field with respect to the interlaced input video signal S1.
A selector 902 as a signal selecting means for outputting the signal 2a or the video signal S2b, and a clock generator 902 for generating a clock CLK supplied to each circuit of the present apparatus.

The input video signal S1 is a digital video signal that has been interlaced and scanned. For example, a video signal obtained by converting an analog video signal from a CCD into a digital signal by an A / D converter or a progressively scanned digital signal is subjected to interlace conversion. A video signal or the like converted into an interlaced scanning signal by a circuit can be considered. The frequency of the clock CLK is equal to the frequency of the clock CLK2 in the first embodiment, that is, the horizontal pixel sampling frequency of the interlaced scanning digital video signal S5 output from the apparatus.

Next, an electronic zoom operation performed by the second embodiment will be described. The input video signal S1 is input to the selector 901.
a, In the case of an even field, it is output as a video signal S2b and written into the field memories 102 and 103, respectively. As a result, an odd field image is written in the field memory 102 and an even field image is written in the field memory 103.

Next, the images written in the field memories 102 and 103 are read out as video signals S3a and S3b, passed through a signal selection circuit 104 and an interpolation operation circuit 105, and output as an output video signal S5. However,
At this time, the read control performed by the memory control circuit 106 and the operations of the signal selection circuit 104, the interpolation calculation circuit 105, the magnification setting circuit 107, the control coefficient generation circuit 108, and the interpolation coefficient calculation circuit 109 are the same as those in the first embodiment. Since this is the same as the embodiment, the description is omitted.

According to the above operation, if the input video signal S1 is an image in which there is no motion between odd and even fields, for example, a still image or a still image continuous shot image in which motion occurs every two fields, the first Since a high-quality enlarged image equivalent to that of the embodiment can be obtained, and all circuits operate with the clock CLK having the same frequency as the clock CLK2 in the first embodiment, the first embodiment is different from the first embodiment. Can further reduce power consumption.

In the first and second embodiments, the linear interpolation method is used as the interpolation method used in the interpolation operation circuit 105. However, the present invention is not limited to this. Any interpolation method using two lines may be used.

(Third Embodiment) FIG. 10 is a block diagram illustrating a basic configuration of a main part of an electronic zoom apparatus according to a third embodiment of the present invention. In FIG. 10, the same reference numerals are given to the same functional blocks as those in FIG. 1 of the first embodiment, so that detailed description of the blocks will be omitted. Reference numerals 1001a and 1001b denote line memories (1HDL) as delay means for delaying input signals by 1H period, respectively, and 1002 denotes an interpolation operation circuit 1.
003 are converted to output signals S4a, S4b, S4c, and S4d of the field memories 102 and 103, respectively.
3a, S3b and line memories 1001a, 1001
A signal selection circuit as signal selection means for selecting from the output signals S3c and S3d of b.

Reference numeral 1003 denotes a signal selection circuit 1002
Calculation circuit as interpolation calculation means for performing interpolation calculation on output signals S4a, S4b, S4c, S4d from
004 controls writing and reading of signals to and from the field memories 102 and 103;
This is a memory control circuit as read / write control means that also generates read / write control signals CTRL of 1a and 1001b.

FIG. 11 shows the interpolation operation circuit 10 shown in FIG.
It is a block diagram which shows the example of a specific structure of 03. In the figure, reference numeral 1101 denotes multipliers 1102 a and 1102 based on an interpolation coefficient w given from an interpolation coefficient calculation circuit 109.
b, 1102c, 1102d, a coefficient calculation circuit for calculating a coefficient multiplied by 1102d, 1102c, 1102c, 1
102d is an output signal S4 from the signal selection circuit 1002.
Multipliers for multiplying a, S4b, S4c, and S4d by the coefficients calculated by the coefficient calculation circuit 1101;
This is an adder for adding output signals from 2a, 1102b, 1102c, and 1102d. With this configuration, the interpolation operation circuit 1003 outputs the input signals S4a, S4b, S4c, S
For the 4d, a cubic convolution interpolation operation is performed and the video signal S5
Is output.

Input video signal S1 and clock CLK
1 and CLK2 are the same as the same-named signal and the same-named clock in the first embodiment, and therefore, the description is omitted.

Next, an electronic zoom operation performed by the third embodiment will be described.

First, the input video signal S1 is converted to parallel by the serial / parallel conversion circuit 101 and written into the field memories 102 and 103 as signals S2a and S2b, respectively, as in the first embodiment. Then, based on the control coefficient k generated by the control coefficient generation circuit 108 by the memory control circuit 1004, the field memories 102 and 1
03 for the video signal S
Read 3a and S3b. Here, the memory control circuit 1
Unlike the first embodiment, the read control performed by the 004 on the field memories 102 and 103 is different from the first embodiment when the control coefficient k at a certain timing is smaller than k before 1H. When the control coefficient k at a certain timing is 0.5 or more and k before 1H is less than 0.5, the double reading is performed on the field memory 103. It is to control.

The read signals S3a and S3b are input to the signal selection circuit 1002 and simultaneously written into the line memories 1001a and 1001b. The memory control circuit 1004 operates in conjunction with the read control of the field memories 102 and 103 to
a, 1001b also have control signals CTRL1, CTR
Reading and writing are controlled by L2. That is, the normal line memories 1001a and 1001b output signals 1H delayed from the input signals S3a and S3b as S3c and S3d, respectively. When the memory control circuit 1004 controls the field memory 102 to read twice, Then, the writing to the line memory 1001a is stopped and read twice, and as a result, the same signal as before 1H is output from the line memory 1001a. Also, the field memory 103
When performing twice-reading control on the
Since writing to 001b is stopped and reading is performed twice, the line memory 1001b outputs the same signal as before 1H.
The signal selection circuit 1002 has two types of signal selection states according to the control coefficient k. FIG. 12 is a diagram illustrating a signal selection state taken by the signal selection circuit 1002.

In the signal selection state 1, the field memory 10
The video signal S3a read out from the second
5, the input signal S3c of the line memory 1001a is input to the input S4a of the interpolation arithmetic circuit 105, the video signal S3b read from the field memory 103 is input to the input S4d of the interpolation arithmetic circuit 105, and the line memory 1001
b is the input signal S4b of the interpolation arithmetic circuit 105.
Select the signal so that

In the signal selection state 2, the field memory 10
The video signal S3a read out from the second
5, the input signal S3c of the line memory 1001a is input to the input S4b of the interpolation arithmetic circuit 105, the video signal S3b read from the field memory 103 is input to the input S4c of the interpolation arithmetic circuit 105, and the line memory 1001
b output signal S3d is the input S4a of the interpolation arithmetic circuit 105.
Select the signal so that

The signal selection circuit 1002 enters the selection state 1 when the value of the control coefficient k is less than 0.5, and enters the selection state 2 when the value of the control coefficient k is 0.5 or more.

The interpolation operation circuit 1003 performs an interpolation operation on the input signals S4a, S4b, S4c, and S4d using the third-order convolution interpolation method. That is, the signal S4
a, S4b, S4c, S4d are multipliers 1102a, 112
02b, 1102c, and 1102d, and the coefficient q (2-) obtained by the coefficient calculation circuit 1101 based on the interpolation coefficient w (0 ≦ w <1) output from the interpolation coefficient calculation circuit 109.
w), q (1-w), q (w), q (1 + w), and the multiplication result is added by the adder 1103 and output as an output video signal S5. Here, the function q is the interpolation function shown in the above (Equation 3). Interpolation coefficient calculation circuit 10
The operation of No. 9 is the same as that of the first embodiment, and the description is omitted.

Hereinafter, the electronic zoom operation performed by the present apparatus will be described in more detail with reference to the drawings.

FIG. 13 schematically shows the zoom operation performed by the present apparatus, taking as an example the case where the magnification m = 5/3. First, a zoom operation in an odd field will be described.

FIG. 14 shows the lines read from the field memories 102 and 103, the output lines of the line memories 1001a and 1001b, and the control coefficient k during the zoom operation.
It summarizes the generation of the interpolation coefficient w and the interpolation calculation. Since the control coefficient k and the interpolation coefficient w are generated by the same operation as in the first embodiment, the description is omitted.

The input video signal S1 is converted by the serial / parallel conversion circuit 101 into S2a and S2b, and is simultaneously written into the field memories 102 and 103, respectively.
Next, under the control of the memory control circuit 106, first, the signal S
The line 3a is continuously read, and the lines ',' are successively read as the signal S3b. Field memory 10
When the line and ′ are read out from the lines 2 and 103, the line and the line 1H before are output from the line memories 1001a and 1001b and input to the signal selection circuit 1002 as signals S3c and S3d, respectively. At this time, since the control coefficient k is 0, the signal selection circuit 1002 sets the selected state 1
Thus, a line is output as the signal S4a, a line 'is output as the signal S4b, a line is output as the signal S4c, and a line' is output as the signal S4d. Then, the interpolation operation circuit 10
03 uses the interpolation coefficient w = 0 from the signals S4a, S4b, S4c, and S4d, and uses q (2) × + q (1) × '+ q
Interpolation is performed by the cubic convolution interpolation method of (0) × + q (1) × ′, and the interpolated line (a) is output as an output video signal S5.

Next, under the control of the memory control circuit 106,
The line and 'are read from the field memories 102 and 103. From the line memories 1001a and 1001b, a line ′ which becomes the signal S2a and S2b 1H earlier is output. Since the control coefficient k = 2/5 <1/2, the signal selection circuit 104 remains in the signal selection state 1, and the interpolation calculation circuit 1003 uses the interpolation coefficient w = 4/5 to obtain q
(6/5) × + q (1/5) × '+ q (4/5) ×
An interpolation operation of + q (9/5) × 'is performed, and the interpolated line (b) is output.

Next, when a signal is read from the field memories 102 and 103, the control coefficient k is 4/5, and k is 2/5 before 1H.
004 is read twice to the field memory 103,
For the line memory 1001b, writing stop and twice reading control are performed, and the lines 'and' are read again.
Normal read control is performed on the field memory 102 to read the line. The line memory 1001a outputs a line serving as the signal S2a one hour before. Since the control coefficient k = 4/5 ≧ 1/2, the signal selection circuit 10
4 becomes the signal selection state 2, and the interpolation calculation circuit 105 uses the interpolation coefficient w = 3/5 to obtain q (7/5) × '+ q (2
/ 5) × + q (3/5) × '+ q (8/5) ×, and outputs the interpolated line (c).

Next, when reading a signal from the field memory, the control coefficient k becomes 1/5, and k = 1H before.
4/5, the memory control circuit 1004 reads the field memory 102 twice,
With respect to 01a, writing stop and twice reading control are performed, and the line is read again. Field memory 1
For line 03, normal read control is performed to read line '. The line memory 1001b stores the signal S2 before 1H.
a, which becomes a. Control coefficient k = 1/5
<1/2, the signal selection circuit 104 is again in the signal selection state 1, and the interpolation operation circuit 105 determines that the interpolation coefficient w = 2.
Using / 5, q (8/5) × + q (3/5) × ′
An interpolation operation of + q (2/5) × + q (7/5) × ′ is performed, and the interpolated line (d) is output. Hereinafter, by repeating the same operation, the interpolation lines (e), (f),
(G) is output.

In the operation in the even field, the generated control coefficient k and interpolation coefficient w are the same as those in the first embodiment, and an interpolation line (interpolation line) using these control coefficient k and interpolation coefficient w is used. a) ', (b)',
The operation of outputting (c) ', (d)', (e) ', (f)', and (g) 'is the same as in the case of the odd-numbered field, and will not be described. The interpolation lines in the even field output in this manner are the interpolation lines (a), (b), (c), (d), (e), (f),
(G) and interlace relationship. Furthermore, if the line interval of the input video signal S1 of the progressive scanning method is 1, the interval between the interpolation lines combining the odd field and the even field is 3/5, and the image is 5 times larger than before the enlargement.
The output video signal S5 is a video signal of the interlaced scanning system, whereas the input is a video signal of the progressive scanning system.

With the above operation, the input video signal S1 of the progressive scanning system is interpolated using the tertiary convolution interpolation method using a total of four lines of each line and three adjacent lines. Is output, it is possible to obtain a high-quality enlarged image that does not impair the higher-frequency components as compared with the first embodiment. Also, as in the first embodiment, all the circuits subsequent to the serial / parallel conversion circuit 101 operate with the clock CLK2. Therefore, a conventional electronic device in which most circuits operate with the clock CLK1 which is twice the frequency of CLK2. Power consumption can be significantly reduced as compared to a zoom device.

(Fourth Embodiment) FIG. 15 is a block diagram illustrating a basic configuration of a main part of an electronic zoom apparatus according to a fourth embodiment of the present invention. In FIG. 15, the same functional blocks as those in FIG. 10 according to the third embodiment are denoted by the same reference numerals, and a detailed description thereof will be omitted. Reference numeral 1501 denotes a selector as signal selection means for outputting an interlaced input video signal S1 as a video signal S2a or a video signal S2b for each field, and 1502 is supplied to each circuit of the present apparatus. This is a clock generator that generates a clock CLK.

The input video signal S1 is an interlaced digital video signal. For example, a video signal obtained by converting an analog video signal from a CCD into a digital signal by an A / D converter, or a progressively scanned digital signal is subjected to interlace conversion. A video signal or the like converted into an interlaced scanning signal by a circuit can be considered. The frequency of the clock CLK is equal to the frequency of the clock CLK2 in the third embodiment, that is, the horizontal pixel sampling frequency of the interlaced scanning digital video signal S5 output from the apparatus.

Next, an electronic zoom operation performed by the fourth embodiment will be described. The input video signal S1 is input to the selector 1501.
In the case of 2a and the even field, it is output as a video signal S2b and written to the field memories 102 and 103, respectively. As a result, an odd field image is written in the field memory 102 and an even field image is written in the field memory 103.

Next, the images written in the field memories 102 and 103 are read out as video signals S3a and S3b, and after passing through the line memories 1001a and 1001b, the signal selection circuit 1002 and the interpolation operation circuit 1003,
It is output as the output video signal S5. At this time, the read control performed by the memory control circuit 1004, the line memories 1001a and 1001b,
02, interpolation operation circuit 1003, control coefficient generation circuit 10
8. The operation of the interpolation coefficient calculation circuit 109 is the same as that of the third embodiment, and the description is omitted.

According to the above operation, if the input video signal S1 is an image in which there is no motion between the odd and even fields, for example, a still image or a still image in which a motion occurs every two fields, the third image is obtained. Since a high-quality enlarged image equivalent to that of the third embodiment can be obtained, and all circuits operate with the clock CLK having the same frequency as the clock CLK2 in the third embodiment, the third embodiment is different from the third embodiment. Can further reduce power consumption.

In the third and fourth embodiments, the third-order convolution interpolation method is used as the interpolation method used in the interpolation operation circuit 105, but the present invention is not limited to this. May be any interpolation method using four adjacent lines.

In the first, second, third and fourth embodiments, two field memories are used.
However, the present invention is not limited to this, and it is also possible to use one memory which has a storage capacity equal to or more than two field memories, and can simultaneously perform writing and reading of two lines and independently perform writing and reading thereof. It goes without saying that it is good.

[0094]

According to the electronic zoom apparatus of the first aspect, for example, for an input video signal of a progressive scanning system, an interpolation line is output using each successive line and its adjacent line, that is, an enlarged image. Can be obtained, it is possible to obtain a high-quality enlarged image equivalent to an electronic zoom device that receives a video signal of a progressive scanning system as an input, and most of the circuits in the device have half the frequency of the conventional one. Since operation can be performed with a clock, power consumption can be significantly reduced.

According to the electronic zoom device of the second aspect,
This has the same effect as the first aspect.

According to the electronic zoom device of the third aspect,
There is an effect similar to that of claim 1 or claim 2.

According to the electronic zoom device of the fourth aspect,
2. A high image quality equivalent to that of the electronic zoom apparatus according to claim 1, for example, when the input video signal is an image in which there is no motion between odd and even fields, for example, a still image or a still image continuously shot image in which motion occurs every two fields. Can be obtained, and the power consumption can be reduced.

According to the electronic zoom device of the fifth aspect,
There is an effect similar to that of the fourth aspect.

According to the electronic zoom device of the sixth aspect,
There is an effect similar to that of claim 4 or claim 5.

According to the electronic zoom device of the seventh aspect,
For example, for an input video signal of the progressive scanning method, three lines are used using a total of four lines of each line and three adjacent lines.
The interpolation line can be output using the next convolution interpolation method, so that an enlarged image with higher image quality can be obtained.

According to the electronic zoom device of the eighth aspect,
There is an effect similar to that of the seventh aspect.

According to the electronic zoom device of the ninth aspect,
There is an effect similar to that of the seventh or eighth aspect.

According to the electronic zoom device of the tenth aspect, for example, when the input video signal is an image in which there is no motion between odd and even fields, for example, a still image or a still image continuous shot image in which motion occurs every two fields For example, it is possible to obtain a high-quality enlarged image equivalent to that of the electronic zoom device according to claim 7 and reduce power consumption.

According to the eleventh aspect of the present invention, the same effects as those of the tenth aspect are obtained.

According to the electronic zoom apparatus of the twelfth aspect, the same effect as that of the tenth or eleventh aspect can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an electronic zoom device according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a specific configuration example of a serial / parallel conversion circuit according to the first embodiment of the present invention.

FIG. 3 is a block diagram illustrating a specific configuration example of an interpolation operation circuit according to the first embodiment of the present invention.

FIG. 4 is a schematic diagram illustrating an operation of the serial / parallel conversion circuit according to the first embodiment of the present invention.

FIG. 5 is a schematic diagram illustrating a signal selection state taken by a signal selection circuit according to the first embodiment of the present invention.

FIG. 6 is an explanatory diagram for explaining an enlarged zoom operation according to the first embodiment of the present invention.

FIG. 7 is an explanatory diagram for explaining an operation in an odd field of each circuit according to the first embodiment of the present invention.

FIG. 8 is an explanatory diagram for explaining an operation of each circuit in an even field in the first embodiment of the present invention.

FIG. 9 is a block diagram illustrating a configuration of an electronic zoom device according to a second embodiment of the present invention.

FIG. 10 is a block diagram showing a configuration of an electronic zoom device according to a third embodiment of the present invention.

FIG. 11 is a block diagram illustrating a specific configuration example of an interpolation calculation circuit according to a third embodiment of the present invention.

FIG. 12 is a schematic diagram illustrating a signal selection state taken by a signal selection circuit according to a third embodiment of the present invention.

FIG. 13 is an explanatory diagram for describing an enlarged zoom operation according to a third embodiment of the present invention.

FIG. 14 is an explanatory diagram for explaining an operation in an odd field of each circuit according to the third embodiment of the present invention.

FIG. 15 is a block diagram illustrating a configuration of an electronic zoom device according to a fourth embodiment of the present invention.

FIG. 16 is a block diagram illustrating a configuration of a conventional electronic zoom device that performs enlarged zoom on a progressive scan input video signal.

FIG. 17 is a schematic diagram illustrating an enlarged zoom operation by linear interpolation in a conventional example.

FIG. 18 is a schematic diagram illustrating an enlarged zoom operation by a third-order convolution interpolation method in a conventional example.

[Explanation of symbols]

Reference Signs List 101 serial / parallel conversion circuit 102, 103 field memory 104 signal selection circuit 105 interpolation calculation circuit 106 memory control circuit 107 magnification setting circuit 108 control coefficient generation circuit 109 interpolation coefficient calculation circuit 110 clock generator 201 selector 202, 203 line memory 204 writing Control circuit 205 Readout control circuit 301 Coefficient operation circuit 302a, 302b Multiplier 303 Adder 901 Selector 902 Clock generator 1001a, 1001b Line memory 1002 Signal selection circuit 1003 Interpolation operation circuit 1004 Memory control circuit 1101 Coefficient operation circuit 1102a, 1102b, 1102c , 1102d multiplier 1103 adder 1501 selector 1502 clock generator 1601 frame memory 1602 line memory 603 interpolation calculation circuit 1604 interlace converting circuit 1605 memory control circuit 1606 interpolation coefficient generation circuit 1607 magnification setting circuit 1608 clock generator

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Sakaguchi 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. F-term (reference) 5C023 AA02 CA01 DA04 DA06 EA03 EA06 EA13

Claims (12)

[Claims] 1. A magnification setting means for providing an enlargement magnification of an electronic zoom, a coefficient generation means for generating a coefficient according to the magnification, and an interpolation operation for an input signal according to a coefficient generated by the coefficient generation means. Interpolating means for performing, serial-to-parallel converting means for performing parallelization on sequentially input signals, storage means for storing signals from the serial-to-parallel converting means, and storage means for inputting to the interpolating means. And a read / write control means for controlling writing and reading to and from the storage means, wherein a signal selected by the signal selection means is changed according to a coefficient generated by the coefficient generation means. And a read / write control means for performing read / write control. 2. The electronic zoom apparatus according to claim 1, wherein the storage unit includes two storage units that can perform independent read / write control. 3. The signal selected by the signal selecting means has a value a (where 0 ≦ a <) where a coefficient generated by the coefficient generating means is present.
The signal to be selected when the value exceeds 1) is changed, and the read / write control performed by the read / write control unit is changed when the coefficient generated by the coefficient generation unit changes from increasing to decreasing or when the value exceeds a certain value a. The electronic zoom device according to claim 1 or 2. 4. A magnification setting means for providing a magnification for enlarging an electronic zoom, a coefficient generation means for generating a coefficient according to the magnification, and an interpolation operation for an input signal according to a coefficient generated by the coefficient generation means. Interpolation calculating means for performing; first signal selecting means for sequentially switching an input signal to be sequentially input to a plurality of output units; storage means for storing each signal selected by the first signal selecting means; A second signal selection unit that selects an input to the arithmetic unit from an output of the storage unit; and a read / write control unit that controls writing and reading to and from the storage unit, according to a coefficient generated by the coefficient generation unit. An electronic zoom device wherein the signal selected by the second signal selection means is changed and the read / write control means performs read / write control. 5. The electronic zoom apparatus according to claim 4, wherein the storage unit includes two storage units that can perform independent read / write control. 6. The signal selected by the second signal selecting means is:
A value a where the coefficient generated by the coefficient generating means is a (where 0 ≦
The signal to be selected when the value exceeds a <1) is changed, and the read / write control performed by the read / write control unit is changed when the coefficient generated by the coefficient generation unit changes from increasing to decreasing or when the coefficient exceeds a certain value a. An electronic zoom apparatus according to claim 4 or claim 5. 7. A magnification setting means for providing a magnification for enlarging an electronic zoom, a coefficient generation means for generating a coefficient according to the magnification, and an interpolation operation for an input signal according to a coefficient generated by the coefficient generation means. Interpolation serializing means for performing parallelization on input signals sequentially input; storage means for storing signals from the serial-to-parallel converting means; delaying a signal from the storage means for a certain period of time A plurality of delay units, a signal selection unit that selects an input to the interpolation operation unit from an output of the storage unit and an output of the delay unit, and a read / write that controls writing and reading to and from the storage unit and the delay unit. Controlling means for changing a signal selected by the signal selecting means in accordance with a coefficient generated by the coefficient generating means, and reading and writing by the read / write controlling means. Electronic zoom unit and performs can control. 8. The electronic zoom apparatus according to claim 7, wherein the storage unit includes two storage units that can perform independent read / write control. 9. A signal selected by said signal selecting means has a value a (where 0 is a coefficient) generated by said coefficient generating means.
≤ a <1), the signal to be selected is changed, and the read / write control performed by the read / write control means is performed when the coefficient generated by the coefficient generation means changes from increasing to decreasing or when a certain value a
The electronic zoom device according to claim 7, wherein the electronic zoom device is changed when the value exceeds the value. 10. A magnification setting means for providing a magnification for enlarging an electronic zoom, a coefficient generation means for generating a coefficient in accordance with the magnification, and an interpolation operation for an input signal according to a coefficient generated by the coefficient generation means. Interpolating means for performing the following; first signal selecting means for sequentially switching an input signal sequentially input to a plurality of output units; storage means for storing each signal selected from the first signal selecting means; A plurality of delay units for delaying a signal from the storage unit for a predetermined period; a second signal selection unit for selecting an input to the interpolation operation unit from an output of the storage unit and an output of the delay unit; A read / write control unit that controls writing and reading to and from the delay unit, and changes a signal selected by the second signal selection unit according to a coefficient generated by the coefficient generation unit. Electronic zoom unit the read-write control means while, characterized in that the reading and writing control. 11. The electronic zoom apparatus according to claim 10, wherein the storage unit includes two storage units that can perform independent read / write control. 12. The signal selected by the second signal selection means has a value a (where the coefficient generated by the coefficient generation means)
The signal to be selected when 0 ≦ a <1) is changed, and the read / write control performed by the read / write control means is changed when the coefficient generated by the coefficient generation means changes from increasing to decreasing or exceeds a certain value a. The electronic zoom device according to claim 10.