JPH11146184A - Communication terminal equipment with image rotation function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rotate an image with a simple and inexpensive constitution by allowing a rotation control part to repeat a series of control which rotates only the size portion of an image memory among data decoded line-by-line from an image memory and stores it in the image memory. SOLUTION: A rotation control part 11 of facsimile equipment F with an image rotating function successively decodes encoded data in an image memory 4 line-by-line by CODEC 6, and rotates only four bits (x) in the former half of each line matched with the number of lines (four lines) of an image memory 5 to store in the memory 5. Then, after encoding this to return to another area in the memory 4, the part 11 decodes each line of the memory 4 again, rotates only four bits (y) of the latter half of each line this time to house in the memory 5 and encodes this to return into the memory 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication terminal device having an image rotation function, such as a facsimile machine.

[0002]

2. Description of the Related Art Conventionally, a facsimile apparatus, which is one of communication terminals, has an image rotation function. According to this, a recording paper of A4 or B5 size is previously stored in a recording paper cassette in a landscape orientation. When the image data in the portrait direction is received or read while it is set to, it is not necessary to change the recording direction of the recording paper by changing the recording paper cassette, etc., and the image is automatically rotated by 90 °. , Can be recorded as horizontally long image data. Also, at the time of facsimile transmission, the image is automatically rotated so that the original is set in one of the vertical and horizontal directions, and transmitted to the other party's facsimile apparatus.

Therefore, this type of communication terminal device having an image rotation function is provided with a page memory capable of storing one page of decoded image data (image data), and the page memory stores the image data for one page. After storing, the image data is rotated by changing the reading direction. Alternatively, the image is rotated by changing the reading direction in a predetermined block unit using a high-speed image processing IC.

[0004]

However, in the above-mentioned conventional communication terminal device having an image rotation function, the rotation is processed by calculating an address for each pixel bit, and thus it takes a long processing time. Also requires page memory,
Further, when a high-speed image processing IC is provided, there is a problem that the cost is high.

[0005] The present invention has been made in view of such circumstances, and has as its object to provide a communication terminal device capable of rotating an image with a simple and inexpensive configuration.

[0006]

According to a first aspect of the present invention, there is provided a communication terminal device having an image rotation function, wherein an image memory for storing a plurality of lines of encoded data and an image memory for storing the image data. The image processing apparatus includes an image memory and a rotation control unit. The rotation control unit performs a series of controls for rotating only the size of the image memory out of the data decoded line by line from the image memory and storing the data in the image memory. It is characterized by repeating.

[0007] For example, the image memory stores decoded image data of 4000 bits at 2000 bits (pixels) / line.
It can store encoded data up to the line,
If the image memory can store up to 1000 lines at 4000 bits (corresponding to the number of lines of the image before rotation) / line, the rotation control unit first determines the line of the image memory among the lines decoded from the image memory. Only the first 1000 bits of each line according to the number of lines are sequentially rotated and stored in the image memory. After this is encoded and returned to the image memory, each line of the image memory is decoded again, and only the latter 1000 bits of each line are sequentially rotated and stored in the image memory. By doing so, there is no need to provide an image memory capable of storing image data for one page as in the related art.

According to a second aspect, the size of the image memory in the first aspect is a size obtained by dividing a size capable of storing one page of image data.
A series of controls for each line of data stored in the image memory is repeated the same number of times as the number of divisions. Assuming that one page of encoded data can be stored in the image memory, and if the image memory and the image memory are the same size as the above example, the size of the image data is half the size of the maximum image data for one page. Therefore, the rotation control unit decodes the data stored in the image memory twice and performs the rotation twice.

According to a third aspect of the present invention, a first plurality of registers for storing image data divided into a predetermined size and a second plurality of registers for rotating and storing the image data stored in the first plurality of registers. And a rotation control unit. The rotation control unit repeats a shift operation and an operation for each of the first and second plurality of registers,
The image data is rotated.

In the case where the first plurality of registers are four 8-bit registers, the second plurality of registers can be easily operated by using eight 4-bit registers. If an operation of rotating data while shifting each register is performed, an arithmetic expression at this time becomes simple.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a main configuration of a communication terminal device with an image rotation function according to the present invention.
Here, the configuration of the facsimile apparatus F is shown as one of the communication terminal apparatuses. However, the present invention is also applicable to an apparatus having an image rotation function such as a personal computer connected to an image scanner or a copier. Applied to

In FIG. 1, reference numeral 1 denotes a main control unit for controlling signals of each unit, 2 denotes an NCU for controlling a network such as transmission of a dial signal to a telephone line L, and 3 denotes modulation and demodulation of signals for facsimile communication. Modem to perform, 4 is an image memory for storing coded data for facsimile communication, 5 is an image memory for storing image data obtained by decoding the coded data, 6 is coding / decoding of image data by MH or MR method or the like. (Codec: image coding / decoding unit) 7 for realizing
A display unit for displaying an operation procedure, an operation state, and the like; 8, an operation unit including numeric keys; 9, a reading unit for reading an original image for facsimile transmission or the like; A recording unit that includes a cassette 10a and prints out image data on the recording paper, and a rotation control unit 11 converts original image data into image data rotated by 90 °.

In such a configuration, when performing facsimile reception via the telephone line L, the facsimile apparatus F temporarily stores the received encoded data in the image memory 4.
After that, the data is recorded by the recording unit 10 while being sequentially decoded by the CODEC 6. However, when the direction of the received image data is different from the recording paper direction of the recording paper cassette 10a set in advance, the rotation control unit 11 performs an image rotation process, and then prints out the data by the recording unit 10. . The direction of the image data can be determined before reception by a signal included in the facsimile communication procedure, and the direction of the image data read by the reading unit 9 is determined by a paper width detection sensor provided on a table on which a document is set. It can be detected and determined by such means.

The present invention is characterized by the operation of the rotation control unit 11, which eliminates the need for providing a large-capacity page memory as in the prior art, and makes it possible to reduce the size (capacity) of the image memory 5. ing. The operation of the image rotation function according to claims 1 and 2 of the present invention will be described with reference to FIG. Here, in order to facilitate the description, the encoded data stored in the image memory 4 is represented as decoded image data.
Bit (pixel) × 8 lines. The configuration of the image memory 5 has a size of 8 bits × 4 lines.

The rotation control unit 11 repeats a series of controls for rotating only the size of the image memory 5 out of the data decoded line by line from the image memory 4 and storing the data in the image memory 5. That is, in this example,
The coded data of the image memory 4 is converted into CODE for each line.
C6 is sequentially decoded, and among the decoded lines, only the first four bits (x) of each line corresponding to the number of lines (4 lines) of the image memory 5 are rotated and stored in the image memory 5. Then, this is coded and stored in the image memory 4.
, And again decodes each line of the image memory 4, and only the last 4 bits of each line (y)
Is rotated and stored in the image memory 5, which is encoded and returned to the image memory 4. In the example shown, 90
Although the case of rotating by 90 ° is shown, the same operation is performed when rotating by 90 ° to the left.

In this case, the image memory 4 stores one page of encoded data, and the image memory 5
Is a size obtained by dividing the size capable of storing one page of image data. Specifically, in the illustrated example, the size of the image memory 5 is half the size (8 × 4) of the maximum image data (8 × 8) for one page, and the rotation control unit 11 stores the image data in the image memory 4. Each line of the encoded data is decoded twice, and the rotation is performed twice. That is, the rotation control unit 11 controls the image memory 4
Control of rotation of each line of data stored in
The size that can store the image data for the page is repeated as many times as the number of divisions.

As described above, since the rotated image data is encoded and returned to the image memory 4, the image memory 5 is configured to be able to store one page of image data as in the related art. There is no need to do so, and costs can be reduced. FIG. 3 is a flowchart showing the operation of the rotation control unit 11 (100 to 10).
7). Here, the image memory 5 is described as a 1 / n size page memory having a smaller capacity than the conventional one.

First, the pixel position on the image memory 4 side set in the page memory 5 is set as the head of the line (A in FIG. 2), and the decoding position is set as the head of the page of the document before rotation (A in FIG. 2). . Then, each line is decoded (decoded), and 1 / n pixel of the lines is rotated and set in the page memory 5 from the set start position (C in FIG. 2).

When the decoding of one page is completed, the image data of 1 / n line (x line in FIG. 2) stored in the page memory 5 is encoded.
Then, the pixel position on the image memory 4 side to be set in the page memory 5 is advanced by 1 / n pixel (referred to as position A in FIG. 2). Here, if the encoding for one page has been completed, the rotation process ends. If the encoding for one page has not been completed, the decoding position is set again as the top of the page of the document before rotation (A in FIG. 2). Each line is decoded, 1 / n of the pixels are rotated, the setting is continued in the page memory 5 from the set start position (C in FIG. 2), and the above is repeated until encoding for one page is completed. Repeat the operation.

Next, the operation of the image rotation function according to the third aspect will be described with reference to FIGS. Here, the image data before rotation is divided into a predetermined size, and each divided data is sequentially rotated. FIG. 4 schematically shows the state at this time. In the figure, a to h correspond to before and after the rotation. In this case, after decoding the lines belonging to the parts a to d, a, b, c,.
What is necessary is just to process each part so that it may rotate.

Next, the operation of rotating an image in each portion divided into a predetermined size will be described. In order to realize the operation at this time, the rotation control unit 11 rotates the first plurality of registers for storing the image data before rotation and the image data stored in the first plurality of registers,
And a second plurality of registers for finally storing the rotated image data.

In the following, as the first and second plurality of registers, eight 8-bit registers are respectively stored in the first register group 1.
1a and the second register group 11b will be described (see FIG. 1). Further, the first register group 11a
Is represented by Xi [j] (i corresponds to each of a plurality of registers, and j corresponds to each bit in the register) as shown in FIG. 5A, and the second register group 11b FIG.
As shown in (b), it is assumed that Yk [l] (k corresponds to each of a plurality of registers, and l corresponds to each bit in the register).

The rotation control unit 11 rotates image data by repeating a shift operation and an operation for each of the first and second register groups 11a and 11b. The operation at this time will be described with reference to the schematic diagram of FIG. FIG.
Is a flowchart of the operation at this time (200 to 20).
8). First, as shown in FIGS. 5C and 5D, the registers X0 and '1' (correctly “000”
00001 "), and the logical sum of this result and the register Y0 is obtained, and the result is used as the register Y0 itself. Thereafter, as shown in (e) and (f), the register X0 shifts right and the register Y0 shifts left. When such an operation is continued and an operation is executed between the registers X1 to X7 and the register Y0, the data (Xi [0]) surrounded by a thick frame in the register group Xi [j] in FIG. Being
The data (Y0) surrounded by a thick frame in the register group Yk [l] in (g).

At this time, the register group Xi [j] is (h)
Next, the registers X0 to X0
The same operation as described above is performed between X7 and the register Y1, and thereafter, the registers X0 to X7 and the register Y2,... Are sequentially repeated, and the same operation is performed between the registers X0 to X7 and the register Y7. Then, the image data as shown in (a) becomes the image data rotated as shown in (b).

As described above, if the data is rotated while shifting the registers Xi and Yk, the arithmetic expression at this time is simplified. In addition, since the processing is performed between the registers, the access time is shorter than when a memory such as a RAM is used, and the time required for image rotation can be significantly reduced.

[0026]

As can be understood from the above description, in the communication terminal device with the image rotation function according to the first and second aspects of the present invention, of the data decoded line by line from the image memory, Since the original image is rotated by repeating the rotation of only the size of the image, it is necessary to provide an image memory (page memory) until the image data for one page can be stored as in the related art. Absent. Therefore, the image can be rotated with a simple configuration, and the cost can be reduced.

In the communication terminal device with the image rotation function according to the third aspect, the image data is divided into predetermined sizes, and rotation processing is performed between the registers in units of this size, so that the access time can be shortened. The time required for rotation can be greatly reduced. If a register is used to store the image data before and after rotation, the image data can be rotated using a simple operation by repeating the shift operation.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an example of a configuration of a communication terminal device with an image rotation function according to the present invention.

FIG. 2 is a schematic diagram illustrating a basic operation of the communication terminal device of FIG. 1 (claims 1 and 2).

FIG. 3 is a flowchart showing a basic operation of the communication terminal device of FIG. 1 (claims 1 and 2).

FIG. 4 is a schematic diagram illustrating a basic operation of the communication terminal device of FIG. 1 (claim 3).

FIG. 5 is a schematic diagram illustrating a basic operation of the communication terminal device of FIG. 1 (claim 3).

FIG. 6 is a flowchart showing a basic operation of the communication terminal device of FIG. 1 (claim 3).

[Explanation of symbols]

 F: Facsimile apparatus 1: Main control unit 4: Image memory 5: Image memory 6: CODEC (codec) 11: Rotation control unit 11a (Xi [j]) First register group 11b (Yk [l])... Second register group

Claims (3)

[Claims] An image memory for storing encoded data of a plurality of lines, an image memory for storing image data, and a rotation control unit, wherein the rotation control unit decodes one line at a time from the image memory. A communication terminal device with an image rotation function, wherein a series of controls for rotating only the size of the image memory out of the data and storing the data in the image memory are repeated. 2. The image memory according to claim 1, wherein the size of the image memory is a size obtained by dividing a size capable of storing one page of image data, and the rotation control unit controls the series of controls for each line of data stored in the image memory. And the above 1
2. The communication terminal device with an image rotation function according to claim 1, wherein a size capable of storing image data for a page is repeated as many times as the number of divisions. 3. A first plurality of registers for storing image data divided into a predetermined size, and a second register for rotating and storing the image data stored in the first plurality of registers.
, And a rotation control unit. The rotation control unit is configured to rotate the image data by repeating the shift operation and the operation for each of the first and second registers. Characteristic communication terminal device with image rotation function.