JP2690729B2 - Image signal processing device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an image signal processing device for introducing a multi-valued image signal and sending a binarized signal to an output device such as a printer or a CRT. [Prior Art] In recent years, the performance of image information reading devices and printers that print out image information has improved, and reading resolution and print output resolution have also become extremely excellent (for example, Some 300 dots / inch or more have been introduced [Problems to be solved by the invention] However, when outputting read image information from an image sensor or scanner, the device itself is simplified. In order to achieve this, it is also possible to directly output raw multi-valued image information while reading the image information without expanding the read image information into a bitmap image. When developing a bitmap image, the sampling frequency must be changed each time according to the resolution of the device on the print output side. Therefore, in view of the above points, an object of the present invention is to input a multi-valued image signal and perform signal processing according to an output device such as a printer. An object of the present invention is to provide an image signal processing device that can be appropriately performed and that simplifies the device itself [Means for Solving the Problems] The image processing apparatus includes pulse width modulation means for introducing a multi-valued image signal obtained from an image reading section and transmitting a variable pulse width signal, and sampling means for introducing the variable pulse width signal and transmitting quantized data. , Quantized data storage means for storing the quantized data, editing means for editing the quantized data stored in the quantized data storage means, reading resolution of the image reading unit, and image output. Sampling information storage means for storing sampling information based on the output resolution of the output unit, and the reading by controlling the sampling frequency of the sampling means based on the sampling information stored in the sampling information storage means. The present invention is provided with a control means for scaling the image according to the resolution and the output resolution. [Operation] According to the above configuration of the present invention, the variable pulse width signal output from the scanner or the like is quantized data After the data is sampled and stored, the desired editing can be performed, for example, combining with the character data.
Moreover, since the sampling frequency for obtaining the quantized data is variably controlled, it is possible to perform sampling processing according to the output resolution, and as a result, it is possible to absorb the difference in resolution between the scanner and the printer. [Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram of an embodiment to which the present invention is applied. Reference numeral 101 shown in the figure is a scanner that functions as an image information reading device, and outputs a multi-valued image signal. 102
Is a PWM modulator that converts a multi-valued image signal output from an image information reading device (scanner) 101 into a variable pulse width signal, 1
Reference numeral 03 is a sampling information storage device which sends out a sample clock of a predetermined frequency in order to sample the variable pulse width signal output from the PWM modulator 102. Reference numeral 104 denotes a variable pulse width signal output from the PWM modulator 102, which samples the variable pulse width signal in synchronization with a clock transmitted from the sampling information storage device 103 to form a bit image D
Type flip-flop (or equivalent). Reference numeral 105 is a full bit map memory for storing image information for one page for printout. This memory 105 not only stores the output data of the D-type flip-flop 104, but also stores a predetermined character generator 11
Data that has been bit-imaged by 0 (inputting a character code specified by the host device 109) can also be stored (108 is a character generator on the host side). In addition, the memory 105 is a logical sum data of the output data of the character generator 110 and the output data of the D-type flip-flop 104 (that is,
It is also possible to store composite image data). Reference numeral 106 denotes a laser beam printer which prints out the image data read from the full bit map memory 105, and 107 denotes a control device which controls each block described above according to the control procedure shown in FIG. Next, the operation for weighting and outputting the character information output from the host device 109 side and the image read by the scanner 101 will be described with reference to FIG. Assuming that the character information on the host device side has already been expanded in the full bit map memory 105 as a full bit image through the character generator 110,
First, the control unit 107 stores a sampling frequency determined based on information such as the resolution and reading speed of the laser beam printer 106 and the scanner 101 as a sampling information storage unit.
It is stored in 103 (step S201). That is, the control device 107 determines the sample frequency through a predetermined algorithm based on the parameters of the scanner 101 and the laser beam printer 106. Alternatively, it is also possible to previously prepare a sample clock pattern in the sampling information storage device 103 as a table and select a desired sample clock from the table. The control device 107 activates the scanner 101 to output a multivalued read image signal, and the PWM modulator 102 converts the output signal into a variable pulse width signal (step S202). Next, considering the signal processing delay time in the scanner 102 and the PWM modulator 102, the sampling information storage device 10
Output sample pulse (serial clock pulse) from 3. That is, the sample clock information considering this delay time is stored in the sampling information storage device 103 in advance. The D flip-flop 104 latches the variable pulse width signal output from the PWM modulator 102 in synchronization with the serial clock pulse sent from the sampling information storage device 103, and executes sampling of one data (step.
S204). The control unit 107 has the data sampled by the D-type flip-flop 104 and the full bit map memory 105.
Then, the logical sum operation is performed with the corresponding data stored in and stored in the full bitmap memory 105 again (step S205). Further, the address of the full bit map memory 105 is updated for the data to be stored next (step S206). After that, it is determined whether the data output from the scanner 101 has reached the line end (step S207), and if it is not the line end, the next data is sampled again (step S204), and the control device 107 has the original data. The obtained data is ORed and stored in the full-bit memory (step S20).
Five). When the data output from the scanner 101 reaches the line end, a line feed is performed, and the address of the full bit memory 105 is updated to match the line feed (step S208). Next, it is determined whether it is the page end. If it is not the page end, the step S202 is again executed to input the next line information.
Return to (step of activating the scanner 101). If the page end (YES) is determined in step S209 and it is not necessary to print the output image information from the scanner 101 and the character information from the host device side again (step S210, YES), the full bitmap Laser beam printer to store data from memory 105 1
Send to 06 to print out. It should be noted that not only the laser beam printer as the output device but also another display output device or the like can be used. Also, by changing the information content stored in the sampling information storage device 103, it is possible to output an image that is compressed and expanded in the horizontal direction (sampling for each line is also possible in the vertical direction). . Further, even when the scanner 101 and the PWM modulator 102 are replaced with a host information processing device and a character generator, only the data stored in the sampling information storage device 103 is changed without changing the hardware. It becomes possible to adapt to the resolution of the printer. Furthermore, by adopting a configuration in which the control device 107 automatically determines the resolution of the laser beam printer 106 and expands the sample frequency information in the sampling information storage device 103, even if the laser printer has any resolution, A standard interface device can be realized. Furthermore, not only data movement for each bit but also processing for each byte / word (16 bits, etc.) is possible by constructing a peripheral circuit. If the reading speed of the image information reading device is within the operating speed of another device and the capacity of the sampling information storage device is within the allowable amount, change the reading speed or resolution of the image information reading device to a different one. In this case, the processing information can be dealt with by changing the storage information of the sampling information storage device, and a processing device with high flexibility can be constructed. [Effects of the Invention] As described above, according to the present invention, a variable pulse width signal output from a scanner or the like is encoded into quantized data, and after the data is stored, for example, synthesis with character data is performed. It is possible to perform desired editing. In addition, according to the present invention, since the sample frequency information can be appropriately rewritten by user's designation or automatic designation, regardless of the resolution and reading speed of the image reading device or the output device, and Variation in output image (compression, expansion, etc.)
It is possible to realize a versatile image signal processing device. That is, by appropriately changing the sample frequency information according to the resolution of the image output device, it is possible to perform sampling suitable for the output device such as the printer without changing the hardware.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a flowchart showing a control procedure to be executed by the control device shown in FIG. 101 ... Scanner, 102 ... PWM modulator, 103 ... Sampling information storage device, 104 ... D flip-flop, 105 ... Full bitmap memory, 106 ... Laser beam printer.

Claims (1)

(57) [Claims] Pulse width modulation means for introducing a multi-valued image signal obtained from an image reading section to send a variable pulse width signal; sampling means for introducing the variable pulse width signal to send quantized data; A quantized data storage means for storing, an editing means for editing the quantized data stored in the quantized data storage means, a reading resolution of the image reading section, and an output resolution of an output section for outputting an image. Sampling information storage means for storing sampling information based on the sampling resolution, and controlling the sampling frequency of the sampling means on the basis of the sampling information stored in the sampling information storage means to adjust the reading resolution and the output resolution. An image signal processing apparatus, comprising: a control unit that performs scaling of the image. 2. The image signal processing apparatus according to claim 1, wherein the editing includes combining the stored quantized data and character data.