KR940001844Y1 - Apparatus for rotating color picture - Google Patents

Abstract

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Description

Image rotating device

1 is a flow chart showing a conventional image rotation method.

2 is a block diagram showing an embodiment of an image rotating apparatus according to the present invention.

3A to 3C are diagrams showing how data is stored in the image rotating apparatus of FIG.

* Explanation of symbols for main parts of the drawings

110: character storage unit 120, 150: buffer

130: decoder 140: shift register section

SR1 ~ SR8: Shift register 160: Image buffer

The present invention relates to a device for rotating and displaying a character read from a character storage unit in a device where recollection is processed as digital data. In particular, the data processing speed is increased by hardware implementation of data processing for rotating a character. An improved image rotating apparatus.

Conventionally, when outputting a land scape or vertical writing, the software reads a shape in a font ROM by using software to rotate 90 °. That is, by using the command, the character data is read out one bit at a letter shape storage unit and recorded in the image buffer in which the output shape is stored. At this time, the recording position of each bit of data recorded in the image buffer is calculated in advance. In this way, the shape of the shape is stored in the image buffer by the command is outputted by the command is 90 ° rotation.

1 shows the order in which images are rotated in software. First, the coordinate position of the image buffer in which the output data is stored is calculated (10). That is, data read one bit from the character storage unit is stored in the image buffer, and the address of each bit of the image buffer is calculated to be written in a form rotated by 90 ° with the character stored in the character storage. Then, by the predetermined command, the character data is read out bit by bit from the character-shaping part 20, and it is determined whether the read data bits are '0' or '1' (30). If the data bit value is '1', '1' is recorded at the coordinate position of the image buffer calculated previously using a predetermined command (40). If the data bit value is '0', the calculated image buffer '0' is recorded at the coordinate position (50). When the data bit value is recorded in the image buffer, it is checked whether or not the character data to be rotated by 90 ° from the character shape storage part has been read out to the last bit (60). If the last bit of the shape data is not read out, the feedback is fed to the first step of calculating the coordinate position of the image buffer, and when the reading is completed up to the last bit of the shape data, the reading of data from the character shape storage unit is terminated. Then, by printing the shaped data recorded in the image buffer, the shaped shape rotated by 90 ° is displayed.

As described above, the conventional image rotation method using software takes a long time to rotate one shape by 90 °. For example, in the case of rotating a 40-bit by 40-bit bit by 90 °, it takes 4 clocks to read data in bit units and write it to the image buffer, and if 1 clock is 100nse0, 40 (bits) x 40 ( Bit) x 4 (clock) x 100 (nsec) = 640 (μsec), it takes 640 μsec to rotate the 40 x 40 bit child by 90 degrees.

Therefore, the present invention provides an image rotation apparatus for improving the data processing speed by implementing hardware processing of the data to be rotated in the image rotation means for outputting the child shape stored in the letter shape storage unit in a rotated form. The purpose is to provide.

In order to achieve the above object, the present invention is an image buffer is stored so that the character shape storage unit that stores the data to create a character shape, and the shape data read out from the character shape storage unit is output in a rotated form and sequentially stored An image rotating apparatus comprising: a first buffer for reading and temporarily storing character data from a character storage unit in byte units, and receiving data in byte units from the first buffer and outputting the data in bit units A shift register, a decoder designating each shift register to sequentially perform data input / output of the shift registers, and a second bit receiving data from each of the shift registers in bit units to the image buffer in byte units And a buffer.

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

2 is a block diagram showing an embodiment of the image rotating apparatus according to the present invention, Figures 3a to 3c is a form in which the character data is stored in each data storage location in the image rotating apparatus of FIG. It is. As shown in FIG. 2, the image rotating apparatus according to the present invention includes a letter shape storage unit 110, an image buffer 160 temporarily storing the outputted shape data, and the letter shape storage unit 110. A first buffer 120 and a second buffer 150 respectively coupled to the image buffer 160, eight shift registers SR1 to SR8 for receiving one-byte data and outputting the data one bit at a time; The decoder 130 is configured to sequentially specify the operation of the shift register.

The letter-shaped memory unit 110 stores 8-byte data in the form shown in FIG. 3A. The 8-byte data is read in bytes and stored in the first buffer 120. The first buffer 120 supplies the stored 1-byte shaped data to the shift register. At this time, among the eight shift registers SR1 to SR8, the shift register receiving one-byte data from the first buffer 120 is interrupted by the decoder 130. As described above, the first buffer 120 reads out the character data from the character-type storage place 110 one by eight in turn, and the read one-byte data is read by the decoder 130. It is stored in order in the shift registers designated sequentially. FIG. 3B shows a state in which 8 bytes of child-shaped data read from the character-type memory storage unit 110 are sequentially stored in the eight shift registers SR1 to SR8. As such, the eight shift registers stored by one byte are output one bit from each shift register and supplied to the second buffer 150. At this time, a control signal C supplied from a control unit (not shown) is input to each shift register so that data stored in the shift register is shifted right by one bit each time one bit is read from each shift register. Similarly, the control signal C is also supplied to the second buffer 150, and data output by one bit from each of the eight shift registers becomes a single byte of data in the second buffer 150, as shown in FIG. 3C. It is recorded in the image buffer 160. 3B and 3C, the first bit is read from each shift register to be 1 byte of a1, b1, c1, d1, e1, f1, g1, h1, and this data is used to store the second buffer 150. The first byte data of the image buffer 160 is recorded. Then, the data stored in each shift register is shifted by one bit by the control signal C, and then shifted by one bit in each shift register, and then read by one bit in each shift register to read a2, b2, One byte of c2, d2, e2, f2, g2, and h2 is recorded as second byte data of the image buffer 160 via the second buffer 150. In this way, since the eighth data bit is read from the eight shift registers, the image buffer 160 stores the shape data in the form shown in FIG. 3C. As can be seen in the figure, the image buffer 160 is stored in the shape data in a state rotated 90 ° compared to the letter-shaped memory unit 110. As such, the time required to rotate the image in hardware is only shorter than the time required in the software method described above. That is, in the case of rotating the 40-bit × 40-bit shape by 90 ° as in the previous example, if 8 clocks are required to read the data and write it to the image buffer, the present invention processes the data in units of bytes so that 40 (bit) X 8 (byte) x 8 (clock) x 100 (nsec) = 256 (μsec), which reduces the time required by about 2.5 times that of the conventional software method.

As described above, in the image rotation apparatus according to the present invention, in displaying the character data in a rotated form, data processing for rotating the child shape using a shift register, a buffer, a decoder, and the like is performed. By implementing in hardware, the time required to rotate the image is shorter than the conventional software method.

Claims (1)

Character shape storage unit 110, which stores the data forming the character shape, and the image buffer read out from the character shape storage unit 110 is converted to be output in a rotated form is sequentially stored image buffer 160 In the image rotating apparatus having a first buffer 120 for reading and temporarily storing the character data from the character-shaped storage unit 110 by the byte unit, and the byte unit from the first buffer 120 Shift registers SR1 to SR8 that receive data and output data in bit units, a decoder 130 for designating each shift register to sequentially perform data input / output of the spregisters, and the shift registers SR1. And a second buffer (150) for receiving data in bit units from the SR8 to the image buffer (160).