JPH0273709A - Multiplier - Google Patents

Abstract

PURPOSE:To attain high speed rewrite by supplying a signal to a selection section connecting coefficient data sent to multipliers to all multipliers respectively externally so as to revise the data. CONSTITUTION:Each of latch circuits 1a-1c is operated sequentially by an enable signal, a coefficient data is supplied externally to the latch circuit in the operating state and a different coefficient data is stored in the latch circuits 1a-1c. A data selector 2 selects any coefficient data fed to the latch circuits 1a-1c by using a select signal supplied externally and sends a selected coefficient data to a multiplier 3. The multiplier 3 multiplies the supplied read picture data with the coefficient data and sends the picture data being the result of calculation. Thus, the coefficient data supplied to all the multipliers by varying the select signal fed to the data selector 2 are changed at once and the rewrite of the coefficients stored in the multiplier is attained at a high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multiplier that can rewrite coefficients of a multiplier at high speed, and a multiplier coefficient rewriting circuit device.

[Prior art and its problems] In a multiplier used in an image filter necessary for image processing, for example, in order to perform image processing on image data read by a scanner etc., the multiplier uses the This is done by multiplying the data by the data held by the multiplier. There are two methods for fixing the coefficients held by the multiplier to one type, and a method for writing the coefficients using software.

If the coefficients are fixed, image processing that involves the coefficients held by the multiplier, such as edge enhancement or smoothing of objects displayed on the screen, cannot be performed. - The traditional method of writing force coefficients is
For example, in the case of a 5×5 multiplier, there is a problem in that it is necessary to read coefficient data into the multiplier 25 times, and it takes time to rewrite the coefficients of the multiplier.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a multiplier that can quickly rewrite the coefficients held by the multiplier.

[Means for Solving the Problems] The present invention has a plurality of storage units that hold coefficient data supplied from the outside, and a plurality of coefficient data sent from the front storage unit, which are combined into one by a signal supplied from the outside. The present invention is characterized by comprising: a selection unit that selects and sends the selected coefficient data to a multiplier; and a multiplier that multiplies image data and the coefficient data.

[Operation] Coefficient data supplied from the outside is sent to the selection section via the storage section. Among the plurality of coefficient data held in the selection section, one coefficient data is selected by a signal supplied from the outside, and the selected coefficient data is sent to the multiplier.

[Embodiment] FIG. 1, which shows an embodiment of the present invention, shows a coefficient rewriting circuit for a multiplier that can rewrite three types of coefficients.

The output sides of the latch circuits 1a to 1c, to which coefficient data for image processing is supplied as well as enable signals for activating or inactivating the latch circuits, are each connected to a data selector 2. . The data selector 2 is a circuit that selects three types of coefficient data supplied from the latch circuits 1a to lc using a select signal supplied from the outside, and the output side of the data selector 2 is connected to the multiplier 3. The data of the read image is supplied to the multiplier 3 as in the conventional example.

In the coefficient data rewriting circuit configured as above,
The latch circuits 1a to 1c are sequentially activated by the enable signal, and coefficient data is externally supplied to the latch circuits in the activated state, thereby storing different coefficient data in each of the latch circuits 1a to 1c. . The data selector 2 selects one of the coefficient data supplied from the latch circuits 1a to lc in response to a select signal supplied from the outside, and sends the selected coefficient data to the multiplier 3. The multiplier 3 multiplies the supplied read image data and coefficient data and sends out image data that is the calculation result.

By adding the above latch circuit 1 and data selector 2 to each of the plurality of multipliers 3, the coefficient data supplied to all the multipliers can be changed at once by changing the select signal supplied to the data selector 2. can be changed to .

If the coefficient data is fixed to several types, the launch circuit described above is not provided, and the coefficient data is set by pull-up and pull-down, and the data selector 2
It is also possible to switch coefficient data by .

FIG. 2 shows an example of a coefficient rewriting circuit for a 5×5 multiplier. The cells 4 are circuits that include the three latch circuits 1a to Ic described above, the data selector 2, and the multiplier 3, and are arranged in a matrix of five each in the vertical and horizontal directions. An address signal input terminal (indicated as A in the figure) 4a connected to the address terminal 5 provided outside the cell 4 is connected to a data signal input terminal (indicated as D in the figure) 4b provided in the cell 4. is connected to a data terminal 6 provided outside the cell 4, and a select signal input terminal (indicated by S in the figure) 4c provided in the cell 4 is connected to a select terminal 7 provided outside the cell 4. Further, each cell 4 is supplied with the read image data.

In the above configuration, 7 is connected via address terminal 5.
An address signal consisting of a pinpoint is sent to all cells 4. The upper 5 bits of this address signal are 25
This is information for selecting one of the cells 4, and the lower two hits are data for selecting one of the three latch circuits l provided in the cell 4.

In this way, one of the 25 cells 4 is selected, and after selecting the latch circuit l in the selected cell 4,
Coefficient data is supplied to the selected latch circuit via the data terminal 6. After the coefficient data is supplied to all the latch circuits l provided in all the cells 4, a select signal is supplied via the select terminal 7 to send the select signal to the data selector 2 provided in all the cells 4. A signal is sent, and each data selector 2 selects one of the three types of coefficient data supplied from the latch circuit 1, and the coefficients of the multipliers in the cells 4 are determined at the same time. Then, each cell 4 multiplies the image data and coefficient data and sends out the calculation result in the same manner as described above. The calculation results sent out by the 25 cells 4 become image data and are sent out from the output terminal 10.

Therefore, when changing the coefficients of the multipliers in cells 4, 25 cells 4 can be changed by changing the select signal.
It is possible to change the coefficients of the multipliers in one at a time.

In this embodiment, a multiplier used in an image processing apparatus has been described, but the present invention is not limited to this and can be applied to general circuits that use multipliers.

Further, although there are three types of coefficient data that can be selected, the number of coefficient data can be arbitrarily set by increasing or decreasing the number of latch circuits. Further, in this embodiment, a cell equipped with 5×5 multipliers has been described, but the number of multipliers can also be set arbitrarily.

[Effects of the Invention] As described in detail below, according to the present invention, the coefficient data sent to the multipliers can be changed by externally supplying signals to the selection units connected to all the multipliers. Therefore, the coefficients held by the multipliers can be rewritten for all multipliers at once, and the rewriting can be performed at high speed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a multiplier of the present invention, and FIG. 2 is a block diagram showing an example of the configuration of a coefficient rewriting circuit using the multiplier of FIG. 1. ■ ・Rudge circuit, 2...Data selector, 3.
- Multiplier, 5... Address terminal, 6... Data terminal, 7 - Select terminal.

Claims (1)

[Claims] (1) A plurality of storage sections holding coefficient data supplied from the outside and a plurality of coefficient data sent from the front storage section are selected by a signal supplied from the outside, and the selected coefficient data is sent to the multiplier. A multiplier comprising: a selection unit that transmits data; and a multiplier that multiplies image data and the coefficient data.