JPS61188670A - Method for rotating picture singals - Google Patents

Abstract

PURPOSE:To enable the sampling frequency and the read clock frequency to coincide with each other in case of the preparation of picture signals of an image rotated by 90 degrees by using a digital memory. CONSTITUTION:When recording a still of an object 8 by a recording device 10, picture signals 7a from a picture pickup device 7 are displayed on a picture display device 9 for processing such as focal adjustment. If it is necessary to rotate the displayed image, write command signals are supplied to a digital memory 2 and an image element data 5a obtained by sampling at a preset frequency by an A/D converter 5 corresponding to one picture are written in the memory 2. An optional image rotating mode is set and the image element data 2a read with clock frequency from the memory 2 are applied to the devices 9 and 10 through a D/A converter 6. In such a manner, the sampling and the clock frequencies can be coincided in preparing the picture signals of an image rotated by 90 degrees.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method of electrically creating a video signal of an image rotated by 90' with respect to an original image by using a digital memory.

<Prior art> Recently, a method has been developed in which a negative film is imaged with an imaging device and the resulting video signal is recorded as a still image on a disk-shaped magnetic sheet.
A system has been developed in which images are displayed on a television receiver or monitor for viewing when necessary.

In this case, the original picture in the negative film will be in either the original or horizontal orientation depending on the frame. Although there are various different states of inversion, it is generally necessary for television sets to display images in an upright position.

Conventionally, therefore, a method has been adopted in which the original image is fully optically rotated by 900 or 1800 degrees using an image rotating mirror device and the rotated image is captured. However, image rotation mirror devices are extremely expensive.

Therefore, by temporarily storing the video signal in digital memory, changing the address and reading it out, p190o or 18
A possible method is to obtain a video signal of an image rotated by 0.00. That is, as shown in FIG. 2, if we consider a digital memory 2t in which the memory cells are arranged in a matrix of [m11] columns and X(n+1) rows in correspondence with the pixel arrangement, first, we will consider a rask scanning type image. The signal t is A/D converted and written to the i-th horizontal scanning pixel data PDiO-PDin' on the screen as shown by the arrow H in the i-th storage element Mi0 to MinVC)@next, and the data for one screen is written. Pixel data PDOO""Pmn"
ft are all stored in the digital memory 2. After that, if the original picture is oriented horizontally to the left as shown in Figure 3 (a), PDmo-P
Doo→PDm1〜PDol→・・→PDyy1n-P
The pixel data is read out vertically from the 0th column to the nth column from bottom to top as shown by arrow V, such as DOn. Also,
Convert it as necessary. As a result, 1. A video signal of an image rotated by 90 degrees with respect to the original image is obtained. In addition, if the original image is facing right, PDOn-PDmn→...→PDo
Pixel data is read out vertically from top to bottom from the nth column to the 0th row, such as o to PDmo. Also, if it is an inverted original, PDmn-PDmo→...→PDon
- Pixel data is read out horizontally from right to left from the mth line to the 0th line, such as PDoo. If the original image is erect, of course it is sufficient to read out in the same order as when writing, that is, from the Oth row to the mth row in the horizontal direction from left to right.

<Problems to be Solved by the Invention> However, when obtaining a video signal of an image rotated by 900 with respect to the original image, generally the sampling frequency f of A/1) conversion for recording the video signal in a digital memory is
, and the clock frequency fck for reading the video signal from the digital memory, the original image 12 in FIG. 3(a) becomes like the image 13 in FIG. The problem is that it changes. The reason is as follows.

Here, fH: Horizontal scanning frequency ()iz) N: Number of horizontal scanning lines (lines/frame) A: Horizontal dimension of effective screen of image display device B: Vertical dimension of effective screen of image display device Ra5p: Image display device A ηH of the effective screen: Effective horizontal scanning of the image display device NH: Number of effective horizontal scanning lines of the image display device. Now, the video signal is A with sampling frequency fi3.
/ D conversion and writing to digital memory at a clock frequency of f8, and reading at the same address 1114 as the writing at a clock frequency of fs, the horizontal pinch PH of a pixel on the screen of an image display device is the vertical direction of a pixel The pitch is Pv tri. On the other hand, since they are arranged in the sun direction so as to be rotated by 90', and the horizontal magnification M)I increases, the vertical magnification Mv is expressed by formula t41. In this case, MH, , == Mv = 1 is practically difficult. That is, since fH=15.75 KHz in a normal television system, f, #12 MHz is required to make MH=My. However, with a sampling frequency of 12 MHz, it is impossible to faithfully sample a video signal with a band of 0 to 7 MHz. Therefore, for example, if a video signal is sampled at 14 MJ (z), it will rotate 900 times relative to the original image. If the readout clock frequency required to obtain the video signal t of the image is fck, then fck is 10.2 MHz, and fck and f do not match.

As described above, the fact that the sampling frequency fs and the read clock frequency fck do not match makes system design extremely complicated.

In view of the problems of the prior art described above, the present invention provides a method in which the sampling frequency and the readout clock frequency match when creating a video signal of an image rotated by 90' around the entire circumference of a digital memory. With the goal.

Means for Solving the Problems> The l1Ii' image signal rotation method according to the present invention, which achieves the above-mentioned object, involves rotating a raster scanning video signal tube ηH, storing sampled pixel data in a digital memory, and storing the sampled pixel data in a digital memory. It is characterized in that pixel data is read every (K-1) columns along the pixel columns in the vertical direction in one cycle time.

However, fH is the horizontal scanning frequency, NH is the number of effective horizontal scanning lines of the image display device, Δ is the horizontal and vertical dimension ratio of the effective screen of the image display device, η□ is the effective horizontal scanning area ratio of the image display device, and ′ is 2 Must be an integer greater than or equal to

<Function> Even if the sampling frequency and the readout clock frequency □ are equal, when reading pixel data in the vertical direction (K
- When painting data is read every D columns, the vertical magnification Mv (K) on the screen is 1, so Mv (K) =
If we find the sampling frequency fs that satisfies MHk, we get ηH.

Then, the pixel data is read out in the tC vertical direction (by reading out every other column K-1), and the readout frequency and clock frequency are strictly set to the rji image before rotation. An embodiment of the present invention will be explained with reference to FIG.

FIG. 1 shows an example of the configuration of an apparatus for implementing the method of the present invention. In the figure, 2#:t digital memory, 3 an address generator, 4 a clock generator, 5 an A/D converter, and 6 a D/A converter. It is configured. 7 is an imaging device, 8 is a subject, 9 is an image display device, 10 is a recording device, and 1st operation device.

In FIG. 1, a clock generator 14 generates a clock pulse 4a having a wave number expressed by equation (8). For example, KHz1'
If q, = 0.776, then f # 16.9 deer2. An A/D converter 5d is controlled by a clock pulse generator 4a, and a sample value (pixel data) 5a obtained by digitizing the video signal 7a from the imaging device 7 is given to the digital memory 2. The digital memory 2 is the operating device 11
The R/W command signal 11a from the A/D converter 5
Write the pixel take 5a from or read out the stored pixel data. In this case, the read address and read address of the digital memory 2 are designated by the signal 3a from the address generator 3.

The address generator f13 updates the clock pulse 4a. Further, the address generating device 3 is controlled by the image rotation mode setting signal 11b from the operating device 11, and outputs an address designation signal corresponding to, for example, one of the following 4m modes.

January Left sideways image*1 - right 900 rotation mode to make it erect: Considering the digital memory 2 shown in Figure 2, when writing, the raster scanning video signal 1 on the screen is rotated by the horizontal scanning of the eye. Set the pixel data FD io -PD in to 1 as indicated by arrow H.
All pixels for one screen are taken PDoo=PD by sequentially writing to the memory elements Mi and -Min of the row from the beginning.
Assume that mn is written 0. Then, in this clockwise 90' rotation mode, "First, the pixel data of the O column is
If you read it in the direction, from then on, the pixel data of the 2nd column is read from the bottom to the top → the pixel data of the 2nd column is read from the metalwork to the top →...
・→pixel data of column qK from bottom to top"
Vertical pixel data 914 't-From the left side (', addresses are updated so that they extend sequentially from bottom to top every 113 columns.

(2) 90° left rotation mode for erecting a right landscape image: .

In this 900 rotation left mode, if we first read out the pixel data of the nth column from top to bottom as in "fr:PDon-4PDmn," then the pixel data of the column pn- is read out from top to bottom → n- 2nd column pixel take from top to bottom →
...→n-q Pixel data of column K from top to bottom"
As shown, the vertical pixel data row is divided from the right side (K-1:1
The address is updated so that every other column is read sequentially from top to bottom.

(3) 1800 rotation mode to make an inverted image upright: In this 1800 rotation mode, addresses are updated so that the horizontal pixel data rows are read out sequentially from the bottom and from right to left, contrary to the case of arranging. 0(4) Non-rotation mode when there is no need to rotate the image: In this non-rotation mode, addresses are updated in the same order as when writing.

Note that in both the left and right 900 rotation modes, the interval between reading out one vertical pixel data string and reading out the next vertical pixel data string stops updating the horizontal scanning cycle address.

If the video signal is of interlaced scanning type, 90'
When rotating, the result is that the vertical pixel data string is [: to -1
] Address update is performed in which pixel data is read out vertically in fields so that they are arranged every other column.

Furthermore, when storing one field's worth of video signals in a digital memory, the effective number of horizontal scanning lines of one field is used as NH.

Furthermore, when the image 12 in FIG. 3(a) is rotated 900 times, a blank area 15 appears on the surface. Therefore, the digital memory 2 is adjusted so that this blank area 15 has an appropriate background color and background pattern.
It is best to add an appropriate power signal to the video signal read out from the source.

Furthermore, the value of K will be described. When we consider the case where images from negative film are displayed on an image display device, the aspect ratio of negative film is generally 5:3, whereas the aspect ratio of the screen of a general television receiver or monitor is (-). is 4:3. Therefore, a negative film image 17 is often displayed horizontally on the television screen 16 as shown in FIG. 4(a). In such a case, if you rotate it 90 degrees, the image 18
is displayed. At this time, if K=2, the negative film image 18 will not be too small or protrude from the screen 16, and it will take almost no effort to adjust the magnification of the imaging device.

Next, a description will be given of the operation when still recording the subject 8 with the recording device 10 using the image rotation device 1 shown in FIG. 1. First, the video signal 7at from the imaging device 7 - the image display device #L
9, and perform necessary processing such as focus v# adjustment, magnification adjustment, and color correction while looking at the displayed image. At this time, if the subject 8 is a negative film, it is preferable that the video signal 7a represents a positive image. When it is necessary to rotate the displayed image, a command signal ηR is written to the digital memory 2 and the address generator 3, and the pixel data 5a obtained by sampling at a frequency of
Write one screen worth of data to digital memory 2.

Thereafter, the image rotation mode is set to a desired one, and a read command signal is given to the digital memory 2 and the address generator 3 to read out pixel data in the number of digital memories. The pixel data 2a from the digital memory 2 is usually D/
After A conversion, it is provided to the image display device f19 and the recording device 10.

The video signal 6at for one screen is repeatedly supplied to the image display device ft9, but it is sufficient to supply the video signal 6a for one screen to the recording device 10. The video signal 6a applied to the recording device tIO is recorded on a suitable recording medium 10a such as a disk-shaped magnetic sheet. Note that llc is a recording command signal, and lld is a playback command signal. The video signals recorded on the recording medium unit 10a are reproduced as necessary and provided to the image display device 9 for monitoring of image quality and the like.

-1. If image rotation is not required, either give the video signal 7a from the imaging device &7 directly to the recording device 10, or read the video signal 6a from the digital memory 2 in non-rotation mode to the recording device #, 10. give to

By performing all the image rotation processing as described above, a large number of photographic images in a roll of negative film or a printed photo album, or an image of an arbitrary subject, can be converted into an erect image, regardless of the original state. It can be recorded on a magnetic medium etc. An erect image is displayed on the image display device by applying a magnetic medium or the like to the recirculation device at any time. 7; Image. It is comfortable to watch.

Regarding digital memory> By the way, K=2. △□=grass+Nn#442゜IH#0
-776, fH=15.75 (KHz), f #16.9 (dish z) “
Therefore, the digital memory 2 needs to be fairly high-speed with an access time of 60 NA or less. □Therefore, the speed is slow, for example, the access time is 200 to 300 yen. ns
A method of realizing functions similar to high-speed digital meshes by using a large number of digital meshes will be explained with reference to FIGS. 5 and 6.

Figure 5 shows four digital memories 2OA and 20B.

1 □ This is a block configuration diagram of an example of 20C, 20Dt"Mtn. In the figure, 21 is a 4-stage shift register, 22 is a latch circuit, 23 is a distribution switch, 24 is an address generator, and 25 is an address converter. It is a device.

In FIG. 5, a video signal 7a is A/D converted and sampled, and pixel data 5a is sequentially input to a shift register 21. A signal from the shift register 21 is input. The data in each stage of the shift register 21 is transferred to the latch circuit 22.
is input.

Since the shift register 21 has four stages, the frequency of the clock pulse of the latch circuit 22 is such that the pixel data 5a from the converter 5 is taken in four by four in parallel. The acquisition cycle is four times the sampling cycle, which is slower. Four outputs 22A, 2 of the latch circuit 22
2B, 22C, and 22D are separately applied to four digital memories 20A, 20B, 20C, and 200 through a switch 23t.

Therefore, each digital memory becomes its access point. On the other hand, the switch 23 connects the four outputs 22 of the latch circuit 22.
A, 22B, 22C, 22D and 4 digital/k)i
%20A, 20B, 20C.

The connection relationship with 20D is controlled by the control signal 28.
It operates in such a way that it switches sequentially in each period. As a result, the pixel data for one screen of <Poo = Pmn is divided into A, B, C, D in both the horizontal and vertical directions, as shown in FIG.
The data is distributed and written to four digital memories. In Figure 6, A indicates that the pixel data is a digital memory l720AK.
Similarly, B, C, and D indicate that the pixel data has been written to the digital memory of 20B, 20C, and 20D.
indicates that it has been inserted.

, as shown in Fig. 6, if four adjacent pixel data t are written separately in the four digital memories in both the horizontal and vertical directions, the result will be 900 rotations on the left and right, and 1800 rotations on either side. , in both cases of no rotation,
4 digital memories 2OA, 20B, 20C, 20
It can be read out on the D pixel day. The four read pixel data are input in parallel to each stage of the shift register 26, and the pixel data of the shift register 26 is set to H.

Especially, the desired video signal can be obtained. In addition, in the shift register 26, right 900JH rotation mode and 18
In the case of 00 rotation mode, it is shifted to the left, and in the case of left 900 rotation mode and non-rotation mode, it is shifted to the right.

Here, addresses will be explained. Now, when writing pixel data PDoo-PDmnt into four digital memories A, B, C, and D separately as shown in FIG. 6, the latch circuit 2
Let's consider specifying an address for the four pixel data t-1 that are output at once by Pixel 2. For example, the 6th
As shown in 1, number 0, 0-0 for the horizontal scan of the eye.
゜0-1.0-2...O-j..., 0-lm-;]
In general, let us say that the address of pixel data details output from the latch circuit 22 at the j*th time in the first horizontal scan is defined as ij.

When writing, the address for each digital memory can be updated as o7°O-[-). Therefore, the address translation device 1125 outputs the address designation signal 2414 from the address generator f124 as it is.

Reading in non-rotation mode is the same as updating the address during writing.

In the case of reading in 180° rotation mode, each digital memory has m-[7) m-((7,1-1) m ([7)-2) rn-([7)-3) (m -1) - Clear] (m 1) ((4) 1) (m-1) -([7) -2) (ml) ([,i]-3) -O and the address opposite to the one when writing You can update it. In this case as well, the address converter &25 is the address generator 24.
It is sufficient to simply output the address designation signal from.

In the case of reading in the right 900 rotation mode, each digital memory updates a different address as shown in Table 1 below. However, consider the case of =2. As can be seen from Table 1, if the address generator ft24 generates the address designation signal 24At for the digital memory 20A, the address converter 25 converts only a very small part of it to the other digital memories 20B, 20C, It is sufficient to output address designation signals 25B, 25C, and 25D for 20D. Therefore,
Address conversion and replacement fIt25 can be easily realized with the capacity OR0M.

On the other hand, in the case of reading in the left 900 rotation mode, the addresses of each digital memory are updated as shown in Table 2 below. However, K=2. As can be seen from Table 2, in this case as well, if the address generator 24 generates the addressing signal 24A for the digital memo IJ 20A, the address converter 25 changes only a small part of it to generate the address designation signal 24A for the digital memory IJ 20A. It is sufficient to output address designation signals 25B, 25C, 25D'ft for 20B, 20C, and 20D.

Therefore, an address translation device can be easily realized by using a small capacity ROM.

Note that when Table 2 is compared with Table 1, the update of the address of the digital memory 2OA in the left 90' rotation mode is exactly the opposite of the address update of the digital memory 20D in the right 900 rotation mode. Similarly, digital memo IJ 2 OB in left 900 rotation mode.

The addresses of 20C and 20D are updated in the digital memories 2OA and 20B in the clockwise 900 rotation mode.

This is just the opposite of each address update in 20C.

Therefore, it is not necessary to separately prepare the address conversion device 25 for the left 90' rotation mode and the right 90 degree rotation mode, and it is sufficient to use three address □ conversion ROMt-switches.

As explained with reference to FIGS. 5 and 6, even if the digital memories are low-speed ones, 4S digital memories can be used independently of each other to store accumulated data t.
- Immediately in the S-stage shift register, the pixel data of each stage of this shift register is transferred to the above-mentioned 8 digital memories at the cycle time of the boot time, and the 8 pixel data adjacent in both the horizontal and vertical directions are stored in separate digital memories. When writing and reading, the pixel data of the above eight digital memories is read out in one cycle time, and the eight read pixel data are sent in parallel to the (another) shift register of the t-S stage. By inputting a pixel data into the pixel data and shifting this shift register at a cycle time of 7 to create a pixel data string, it is possible to operate as a digital memory that is substantially 8 times faster.

Among them, when a large number of digital memories are used as shown in FIG. 5, it is not only possible to use low-speed memories, but also the following effects are produced. For example, a high-speed memo IJt of 60 ns or less is used, and a memo Ut of 240 ns is used.
Suppose that 8 or 16 pieces are used. Then, each memory can be accessed every 4804g4 or 960 ns. Therefore, by using the remaining time, while writing the video signal, reading it out in any arbitrary mode can be carried out during the writing, and the image can be monitored in almost real time. Note that there is almost no possibility that the write address and read address will match.

Application example> Figures 7 to 9 illustrate a system for recording still image information of each frame and image on each track of a magnetic disk and using the magnetic medium as an album cover. do. FIG. 7 is a block diagram of the system, and FIG. 8 is an external diagram of the entire system.

In these figures, 100 is an optical system, 200 is a recording system, and 300 and 400 are housings. The optical system 100 is a thread running from a light source 102 driven by a power source 101 to a color video camera deck 103, and on its optical axis 110 are a wedge-shaped ND filter 104, an optical integrator 105, a color correction filter 106, a lens deck 107, optical shutter 10
8 etc. are arranged. 109 is an ND filter 104
Motor for inserting appropriate amount of film 11
113 is a film carrier for holding IF 2 in a predetermined position between the filter 106 and the lens deck 107;
A crimping member for fixing the piece of the positive filter 106 output 112 at a predetermined photographing position, 115 a solenoid for driving the crimping member 114, 1 1
6Ifi film frame illuminance side light detection device, 117 is a direction detection element for identifying the film 1120 type and size as well as the direction of the image taken on the frame (upright, left sideways, right sideways, inverted) t- . As shown in FIG.
On the edge of b, there are holes 112C and notches 11 in fixed round positions, specific shapes, or specific numbers corresponding to the type, size, and orientation of the film so that the type, size, and orientation of the frame can be identified.
Marks such as 2d are formed. lens deck 10
Twelve 7KF1 lens systems 119 and 120 are arranged, and one of the lens systems is inserted onto the optical axis 110 by a motor 125 depending on the size of the film. The entire lens deck 107 is supported by a housing 300 so as to be movable in a direction parallel to the optical axis 110, and is driven by a motor 126.

The camera head 103 is a three-tube type, or #: tR, G
.

This is a color video camera such as a single-tube type with an equal rotation filter, and here, R, G, and H decomposed video signals 12 are used.
7 is assumed to be output.

This camera head 103 is also supported by the housing 300 so as to be movable in a direction parallel to the optical axis 110.
driven by. The lens deck motor 126 and the camera head motor 128 are driven by a motor drive circuit 129, and a central processing unit (CPU) 1 3
The lens deck 107 and camera head 103 are moved up and down to desired positions according to commands from t. Shutter 1 mentioned above
08 and other motors 109, 113, 115.

125 and film transport motor 139 are connected to system bus 130 via amplifiers 132-135 and 13-138, respectively, and controlled by CPU 131. -The output of the illuminance detection element 116 and the output of the orientation detection element 117 are passed through amplifiers 140 and 141t, respectively. It includes a memory 143, keyboards 144, 145, and a paper tape reader 146 for inputting various data such as operator instructions and color correction.One keyboard 1
Reference numeral 44 is for inputting color correction instructions, negative/positive selection, density instructions, and the like. The other keyboard 145 is used to input film type, size, frame orientation, recording instructions, etc.

The video signal 127 output from the camera head 103 is supplied to the negative/positive changeover switch 201 of the recording system 200 and input to the image rotation circuit 1 either directly or via a negative/positive (NP) inversion circuit 202 . Changeover switch 201
is connected to the bust 30 through the drive amplifier 147, and C
It is controlled by PU131. Image rotation circuit 1. Here, it is equipped with three A/D converters, three digital memories, and three D/A converters so as to perform image rotation processing on each of the R, G, and B decomposed video signals. Moreover, each digital memory is constructed using 16 low-speed memories as explained in FIG. The image rotation device 1 is connected to the vane 130 and is controlled by the tcPU 131 such as the rotation mode. Image rotation device 1 and video signals are sent to color correction circuit 203
The zero color corrected video signal input to the recording circuit 204
The signal is input to the magnetic head 205, modified into a predetermined recording method such as FM modulation, and supplied to the magnetic head 205. 206 is a magnetic disk, 207 is a recording track, 208 is a motor for moving the disk, 209 is a nubindle, and 210 is a motor power source. The magnetic head 205 is supported by a head transport mechanism (not shown) driven by a drive amplifier 148, and is movable in the radial direction of the magnetic disk 206 under the control of the CPU 131. The magnetic disk 206 rotates at a constant speed. Thereby, the video signal supplied to the magnetic head 205 is selectively recorded on one of the plurality of recording tracks 207 on the magnetic disk 206. 211 is a waveform monitor of a video signal, 212 is a monitor for an image to be recorded, 213 is a monitor for a reproduced image, and 214 is a reproduction circuit. The color correction circuit 203 described above. Recording circuit 20
4 and a playback circuit 214Fi/<130Km, each of which receives control of the degree of color correction, recording timing, playback timing, etc. by the CPU 131. In addition, C
The PUI 31 has two CPUIs as shown in Figure 8.
31 &, 131 b.

The operation of the system described above will be briefly explained. Film 112t - When placed on film carrier 111,
The CPU 131 connects the connection tape 11 through the detection element 117.
The perforation 112c formed in the film 2a is read to identify the type and size of the film 12=. Also C P
At U1.31-, the position of a frame to be recorded on the magnetic disk drive 206 and the selection data of the recording track 207 are inputted as necessary using the keyboard 145.

Next, when the operator operates the keyboard 145t to open the shutter 108', images of the frames of the film 112 are displayed on the recorded video monitor 212. In this case, the image transfer fli1 may update and write the video signal 127 not only for one screen but one after another, and at the same time read it repeatedly in a non-rotation mode. Next, the operator operates the keyboard 145 while viewing the monitor image to move the camera head 103 and lens deck 107 to the correct shooting condition, and then transports the film 112 so that the desired frame is photographed. . At that time, CPU1
31 identifies the direction of the piece through a detection element □117, or receives the direction data of the piece from the keyboard 145. Also, CPU131H1 magnetic head 205t-'
It is positioned on a desired vacant track 207.

The memory 143 stores the selection of the lens system 119° 120, the position of the camera head 1o3 and the lens deck 107 on the optical axis 110, the relationship between the imaging magnification and the standard illuminance, and the image image according to the type of film 1120, size, and frame orientation. Various data such as the operation mode of transposition &1, necessity of filter 106, and necessity of NP inversion □ are stored as a table.

Therefore, the CPU 131 drives the lens motor 12.5 and controls the camera head monitor 1 according to the direction of the detection element 117.
2.8, driving the lens deck motor 126, driving the filter motor 113 with reference to the output of the photometric element 116, controlling the NP changeover switch 147, and setting the image rotation mode. In addition, the operator controls each of the above buildings using a keyboard as necessary. Thus film 1
When the images of the 12 frames are correctly captured by the camera head 103, the operator performs color correction by operating the keyboard 144 while viewing the monitor image. Next, the operator operates the keyboard 145 to issue a recording instruction, whereby a video signal of one screen (one field or one frame) is recorded on the track 207 of the magnetic disk 206. In the same way, the recording of the next frame is started.

In an application example using the method of the present invention, image conversion of a photographic image can be performed electrically, and the apparatus can be miniaturized.

Furthermore, since image rotation is possible using a dynamic memory with a normal readout speed without using a high-speed memory, the apparatus can be manufactured at low cost. Furthermore, since image rotation is performed in real time, work such as color correction can be performed on the monitor.

<Effects of the Invention> According to the present invention, when all video signals of an image rotated 900 times are created using a digital memory, the sampling frequency and the readout frequency can be matched.

[Brief explanation of the drawing]

Fig. 1 is a block configuration diagram showing an example of an apparatus for realizing the method of the present invention, Fig. 2 is a diagram explaining the principle, and Fig. 3 (a) l (
b), (C) are principle explanatory diagrams, Fig. 4 (a), (
b) is an explanatory diagram of the degree of reduction, Fig. 5 is a block diagram of an embodiment using low-speed memory, Fig. 6 is an explanatory diagram of its principle, and Fig. 7 is a block diagram of an example of a system to which the method of the present invention is applied. FIG. 8 is an external view of the structure, and FIG. 9 is a plan view of the film with identification marks. In the drawings, 1 is an image rotation device, 2 is a digital memory, 3 is an address generator, 4 is a clock generator, 5 is an A/D converter, 6 is a D/A converter, 7 is an imaging device, and 8 is a subject. , 9 is an image display device, and 10 is a recording device.

Claims (2)

[Claims] (1) Raster scanning video signals are sampled at a frequency f approximately equal to ▲ Mathematical formulas, chemical formulas, tables, etc. An image signal rotation method characterized by reading out every [K-1] columns along a vertical pixel column. However, f_H is the horizontal scanning frequency, N_H is the number of effective horizontal scanning lines of the image display device, A/B is the horizontal to vertical dimension ratio of the effective screen of the image display device, and η_H is the effective horizontal scanning area ratio of the image display device = image display The horizontal dimension of the effective screen of the device/the horizontal dimension of the ideal screen, K is an integer of 2 or more. (2) In claim 1, K=2, A/B
An image signal rotation method characterized in that =4/3.