JPS63127672A - Picture signal processing unit - Google Patents

Abstract

PURPOSE:To facilitate the management of a picture signal data by using an output signal of an offset picture count means counting picture element number in the unit of words of a read picture signal data so as to apply parallel picture signal transfer at each word unit of a serial read picture signal. CONSTITUTION:When a picture reader starts reading a picture, a picture signal enable signal 21 is set as a line synchronizing signal 20 is set and a picture signal count enable signal 24 is also set. In this case, as soon as a picture signal clock 16 inputted simultaneously with a serial picture signal 15 is inputted to a serial/parallel converter 5, a gate circuit 14 controlled by a read picture element end signal 23 and a picture signal count enable signal 24 is opened. Thus, the operation of a read picture element counter 8 and the operation of an offset counter 10 by an input picture signal clock controlled by a delay circuit 9 are started. The delay circuit 9 is provided to ensure the timing operation of the output picture signal data of the serial/parallel converter 5 onto a latch 6.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image signal processing device such as a facsimile or scanner device.

2. Description of the Related Art Image signal data read by a facsimile or scanner device and subjected to image processing is usually binarized and is therefore serially transmitted.

In order to store these image signals in the memory area of a computer system, it is convenient to convert the serial image signal data into parallel image signals and transmit them, and high-speed image signal transmission can be performed.

In such cases, as described in Japanese Patent Application No. 61-154501, a double-configured buffer memory is used to collect data sequentially and seamlessly into multiple buffers, and each time the data is transferred to each buffer, By using a method of storing data in an external auxiliary memory (for example, a magnetic disk device), high-speed data collection and transfer becomes possible.

In this case, a well-known method for converting a serial image signal data string into a parallel image signal data string is to simply perform serial-to-parallel conversion in units of words (16 pixels/word) starting from the first image signal data.

Problems to be Solved by the Invention However, in scanner devices, the reading area in the main scanning direction is usually controlled by the number of pixels determined by a given reading size or output size. The number of pixels is not necessarily in units of words, and in particular, handling of the number of pixels remaining when calculated in units of words is important. For example, when a scanner device is connected to a host computer system, and the reading area is controlled by parameters such as reading dimensions or number of reading pixels from the host computer, and these image signal data are transferred to the host computer, This is done by converting into parallel image signals in units of words, etc., but it is more convenient for the fractional pixels as described above to be processed into a shape that can be easily managed by the host computer.

In view of the above problems, the present invention enables reading control in word units by adding the remaining number of pixels calculated in word units to the number of read pixels in the main scanning direction to effective serial image signal data. The present invention provides an image signal processing device with the following features.

Means for Solving the Problems The present invention includes a main scanning pixel counting means for counting the number of pixels read in the main scanning direction of an input serial image signal, and converting the input serial image signal data into parallel image signal data for each word. Serial/parallel conversion means for converting, and offset pixel counting means for counting the number of pixels in each word unit of the read image signal data, and the serial/parallel conversion means is provided with a control signal outputted from the offset pixel counting means.
At the time of conversion by the parallel converter means, by adding the number of offset pixels or the number of padding pixels to the beginning or end of the read image signal data determined by the main scanning reading pixel counting means, the serial image signal The data is transferred word by word.

Function The present invention counts the number of pixels read in the main scanning direction according to the reading size for a serial image signal read by a scanner device or the like, converts this into word-based image signal data, and transmits the data to a computer system. When transferring, the remaining number of pixels for each word unit of the read image signal is set as the offset pixel number,
Alternatively, the number of padding pixels is added to the input read image signal data, and the output signal of an offset pixel counting means that counts the number of pixels for each word of the read image signal data is used to generate a parallel image for each word of the serial read image signal. Since signal transfer is performed, the image signal data can be easily managed on the host computer system side.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a block configuration of an image signal processing device according to an embodiment of the present invention.

In FIG. 1, 1 is a buffer for input serial image signal data 15 and input image signal clock 16, and 2 is an external λfPU.
3, which temporarily stores the number of read pixels given via the data bus signal 17 and write signal 18 of the PU, in order to load it into the color filter 8, is also an external MP.
4 is a lunch for temporarily storing the number of offset pixels given from U via the data bus signal 17 and write signal 19 of the MPU to the counter 10; A buffer for an image signal enable signal indicating a valid state; 5 is a serial/parallel converter that converts an input serial image signal into a parallel image signal; 6 is a temporary storage of the output image signal of the serial/parallel converter 5 in units of words. 7 is an image signal data buffer for interfacing the parallel image signal of latch 6 with an external memory or a host computer; 8 is a read pixel counter that counts the number of read pixels based on the parameters loaded by latch 2; 9 is off-+, which will be described later.
! 7 a delay circuit that delays the image signal clock input to the counter 10; 10 an offset counter that counts the number of offset pixels based on the offset parameter loaded by the latch 3; 11 a read-out prime number counter 8;
, offset counter 10°A reading area timing control unit that performs overall read synchronization control of the serial/parallel converter 5, latch 6, etc.; 12 is an interface unit that controls data transfer timing with an external memory or computer system; 13 is a This is a friso crop that detects the timing of the borrow signal 22 output when the reading pixel counter 8 finishes counting. A gate circuit I4 controls the image signal clock input to the read pixel counter 8. Note that 23 is a reading pixel end signal output from the flip-flop 13. 24 is generated by the line synchronization signal 20 and the image signal enable signal 21, and is generated by the reading area timing section 1 before counting the number of pixels to be read of the image signal.
This is an image signal count enable signal that is output from 1 to 1.
25 is a carry output signal outputted from the offset counter 10, 26 is a response signal for each word from the interface section 12, and 28 is a transfer synchronization signal outputted together with the output image signal 27.

FIG. 2 is a diagram showing the operation timing of the configuration shown in FIG. 1. A fist 30 is a reading reset signal generated within the reading area timing control section 11 by the carry output signal 25 and the reading pixel end signal 23.

The operation of the above configuration will be explained in detail below with reference to FIGS. 1 and 2.

Normally, an image reading device uses parameter instructions such as reading dimensions or number of reading pixels from a host computer.
Alternatively, the image reading device itself calculates the required number of reading pixels from the reading size area of the document using ~4PU etc. and controls the required reading area, but at this time, the image signal enable signal 21
Since the image signal count enable signal 24 is not turned on yet, the image signal count enable signal 24 is not turned on either. Therefore, the number of read pixels obtained from the read size required for this period is loaded into the latch 'f-2 by the data bus signal I7 and the write signal 18, and the remaining number of pixels calculated in word units of the number of read pixels is is set as the offset pixel number and similarly loaded into the latch 3 by the data bus signal 17 and write signal 17.

After that, when the image reading device starts reading the image, the line synchronization signal 20 is turned on and the image signal enable signal 21 is turned on.
is turned on, and the image signal count enable signal 24 is also turned on. At this time, the image signal black is input simultaneously with the serial image signal 15.

At the same time when the signal 16 is input to the serial/parallel converter 5, the gate circuit 1.1 controlled by the read pixel end signal 23 and the image signal count enable signal 24 is also opened, so that the operation of the read pixel counter 8 and the delay circuit are The operation of the offset counter 10 based on the input image signal clock controlled by 9 is also started. This delay circuit 9 is provided to ensure timing operation of the output image signal data of the serial/parallel converter 5 to the latte 6.

Now, for example, when the number of pixels to be read is 39, the remainder 7, calculated for each word, is set in the offset counter 10 as the number of offset pixels.

Therefore, the image signal for the first 9 pixels of the first 1-word image signal of the input image signal clock 16 is converted from serial to parallel, and at the same time, the offset counter 10 counts up by 9 pixels, and at the same time, it is output. The carry output signal 25 operates to convert the output image signal of the serial/parallel converter 5 into a one-word image signal via the latch 6.

In other words, the latch 6 is the starting image signal count enable signal 24.
Since it is turned off by
The first seven pixels remain as 0, and the image signals from the serial/parallel converter 5 are converted into words as they are for the remaining nine pixels. Therefore, after the 16th pixel clock of the input image signal clock, the offset counter 1 is sequentially counted.
0, the output of the serial/parallel converter 5 is converted into a parallel image signal 2 for each word via the latte 6 by the carry output signal 25 outputted every 16 pixel count.
Convert to 7. At this time, the image signal is transferred to an external memory or computer system via the interface section 12 in response to a transfer synchronization signal 28. By the way, the reading pixel counter 8 is counted down by the first input image signal clock 16, and is counted down by the borrow output signal 22 which is output when it finishes counting the number of reading pixels in the main scanning direction determined from the required reading dimension. When the flip-flop 13 is turned on, the reading pixel end signal 23 is immediately activated.
is turned off, resetting the serial/parallel converter 5 and closing the gate circuit 14 at the same time. As a result, the read pixel counter 8 does not operate even if the input image signal clock 16 is continuously input. At this time, the number of reading pixels mentioned above is 39.
The remaining number of pixels subtracted from this is 14 pixels, and the image signal data for 2 pixels, which is less than 1 word unit, is added to the terror output as the number of padding pixels of 0. When this last carry output signal 25 is output.

The image signal count enable signal 24 is turned off by the read reset signal 30 generated in the read area timing control section 11 based on the read pixel end signal 23 described above. In the same way, the input serial image signals that are subsequently generated by the next line synchronization signal 20 can be controlled in the same manner as described above.

Through the above operations, as well as controlling the required reading pixel area,
Image signal reading in word units is controlled.

Although this embodiment has been explained using image signal conversion in units of 1 word as an example, it is easily possible to extend the conversion to both signal conversion in units of 1 byte or integer multiples of the conversion. .

Effects of the Invention As described above, the present invention performs reading pixel control in the main scanning direction according to the reading size for a serial image signal that is an input read by a scanner device, etc., and converts this into image signal data in word units. When converting the read image signal into a computer system and transferring it to the computer system, the remaining number of pixels per word of the read image signal is added to the input read image signal data as the number of offset pixels or the number of padding pixels, and the number of pixels of the read image signal is Since the output signal of the off-cent pixel counting means that counts the number of pixels in each word enables image signal transfer in each word of the serially read image signal, the management of the image signal data can be easily controlled by the host computer system. I can do things. Further, according to the present invention, it is possible to arbitrarily add offset pixels or padding pixels to the beginning or end of image signal data, so that image signal data can be easily arranged.

[Brief explanation of the drawing]

FIG. 3 is a diagram illustrating timing of an image signal processing device according to an example. 5... Serial/parallel converter, 6... Latch,
8 Reading pixel counter, 10... Offset counter.

Claims (1)

[Claims] a main scanning scanning pixel counting means for counting the number of pixels read in the main scanning direction of an input serial image signal; a serial/parallel converting means for converting the serial image signal into a parallel image signal for each word; offset pixel counting means for counting the number of pixels in each word unit of the signal; and a control signal outputted by the offset pixel counting means, when the serial/parallel converting means converts, the remaining pixels in each word unit are counted. An image signal processing device that adds a number as an offset pixel number or a padding pixel number to the beginning or end of a parallel read image signal determined by the main scanning read pixel counting means and transfers it in word units.