JPH0741655U - Image processing device - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to realize a circuit that efficiently transfers data written in one bit plane to another bit plane. [Structure] An input register for reading data at each address of a plurality of bit planes is provided, and its output is input to a multiplexer to select a bit to be transferred. The selected 1 bit is input to the write input terminals of all bit planes. When writing to the bit plane, the write signal is mask-controlled by the register, and the actual writing is performed only to the bit plane to which the write signal is applied. With the above circuit, the contents of one bit plane can be written in another bit plane.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an image processing apparatus having a function of transferring data of each bit plane to another bit plane in a short time.

[0002]

[Prior art]

 When image data is acquired and stored, the image is divided vertically and horizontally, and each divided point represents the brightness and color tone with 1 bit or a plurality of bits and is stored. Image data is obtained for all the divided points, each bit is stored as surface data, and each surface is called a bit plane 11. In FIG. 2, a binary image that can be represented by 1 bit will be described. Here, it is assumed that binary images are stored in the bit planes 1 to 8, respectively. Then, consider a case where the image data of the bit plane 1 is transferred to an unused bit plane 7 and the bit plane 1 is used for another purpose. A conventional circuit block that performs this operation is shown in FIG. In FIG. 3, there are eight bit planes 11, and the bit data 1 to 8 read from each bit plane 11 are stored in the input data register 12. The input data register 12 is directly connected to the bit planes 1 to 8 as input data on a one-to-one basis and serves as write data. Writing to the bit planes 1 to 8 has mask gates G1 to G8 in the write signal 14, and the write signal is input to the bit plane 11 according to the setting of the register C 13 and writing to the memory is executed. R. In the conventional circuit, in order to transfer the binary image of the bit plane 1 to the bit plane 7, as shown in FIG. 4, the data of the bit plane 1 is read bit by bit into the input data register 12 and the input data register 12 is used. A shift operation from bit 1 to bit 7 is performed, and then writing of bit 7 is enabled by setting the register C13, and data is written bit by bit to the bit plane 7 corresponding to bit 7.

[0003]

In the conventional circuit, when a binary image written in one bit plane is moved to another bit plane, it is necessary to perform a shift operation to the bit plane to be moved in the input data register. Since the same operation is repeated for the entire bit plane, it takes time and is inefficient. An object of the present invention is to realize a circuit that efficiently transfers data written in one bit plane to another bit plane.

[0004]

[Means for Solving the Problems]

 An input data register 12 for reading data at each address of a plurality of bit planes 11 is provided. The output of the input data register 12 is input to the multiplexer A16 and the multiplexer B17 for each bit. One bit of each bit input to the multiplexer A is selected by the register A18. The 1 bit selected by the register A 18 is input to one input terminal of each bit of the multiplexer B17. The output of each bit of the corresponding input data register 12 is input to the other input of each bit of the multiplexer B17, and which of the inputs of the multiplexer B is selected is determined by the register B19. The output of the multiplexer B17 is connected to the input terminal of the bit plane 11 corresponding to each bit. In the writing to the bit plane 11, the write signal 14 is mask-controlled by the register C13, and the actual writing is performed only to the bit plane 11 to which the write signal is given. With the above circuit, the contents of one bit plane 11 can be written in another bit plane 11.

[0005]

【Example】

 FIG. 1 shows a block diagram of the present invention. First, the data of the bit planes 1 to 8 before the movement is read to the input data register 12. The data of bits 1 to 8 of the input data register 12 are input to the multiplexer A16 and the multiplexer B17. The multiplexer A16 selects one output from eight inputs according to the contents of the register A18. Then, the output of the multiplexer A16 is input to the input a of the eight 2-input 1-output multiplexer B17, and the input a or b is selected by the register B19. Bits 1 to 8 of the input data register 12 are input to the input b of the multiplexer B17. The output of the multiplexer B17 is input to the write data inputs of bit planes 1-8. When writing to the bit plane, the write signal 14 is masked by the contents of the register C13 to determine the actual write bit plane. For example, when moving the image data of the bit plane 1 to the bit plane 7, the following operation is performed. First, the data of one address of all bit planes is read into the input data register 12. Next, the input a of the multiplexer A16 is selected by the register A18 and output to the a input of the multiplexer B17. The register B19 selects the a input of the multiplexer B17, and supplies the data of bit plane 1 to the input terminals of all bit planes. The register C13 selects the bit plane 7 to be written, the write signal 14 is input only to the bit plane 7, and the data of one address of the bit plane 1 is written to the same address of the bit plane 7. By setting the register A18, the register B19, and the register C13 in the same manner, and reading and writing the bit plane 11 for the address of the entire screen, the image data of the bit plane 1 can be moved to the bit plane 7. it can.

[0006]

[Effect of device]

 With the circuit configuration described above, by setting each register and repeating reading and writing for all addresses, it is possible to shift the data of one bit plane to another bit plane without shifting the input data register. It is useful because it can be easily transferred in a short time.

[Brief description of drawings]

FIG. 1 is a block diagram of the present invention.

FIG. 2 is a conceptual diagram of bit plane movement.

FIG. 3 is a block diagram of conventional bit plane writing.

FIG. 4 is a diagram illustrating a conventional method of moving a bit plane.

[Explanation of symbols]

 11 bit plane 12 input data register 13 register C 14 write signal 15 mask gate 16 multiplexer A 17 multiplexer B 18 register A 19 register B

Claims (1)

[Scope of utility model registration request] 1. A circuit for transferring data of a bit plane in an image processing device to another bit plane, wherein an input data register (12) for reading data of respective addresses of all bit planes (11) is provided, and the input data register is provided. A multiplexer A (16) for selecting 1 bit in (12) by a register A (18) is provided, and an output of the multiplexer A (16) or an input data register (12) is selected by a register B (19). An image processing apparatus including a multiplexer B (17) for controlling the write signal (14) and a register C (13) for controlling whether or not the write signal (14) is input to the bit plane (11).