JPS6213161A - Picture processing device - Google Patents

Abstract

PURPOSE:To attain efficient picture processing by adopting the constitution that the start position of picture processing is set optionally. CONSTITUTION:The method giving automatic detection information of an original position t a CPU35 is as follows: suppose that on original 2 is placed at an optional position of an original platen 1. In this case, preliminary scanning is applied onto the original platen 1 y using an optical system comprising a lens L and a solid-state image pickup element CCD11. The region with absence of an original and an original region are caught by a change in the detection signal of the CCD11. A photoelectric conversion output at the preliminary scanning is given to the CPU35 as a digital data. Then the CPU35 catches the change in the digital data to calculate the coordinates (X, Y) of the picture processing start position A of the original 2. Further, a magnification/reduction circuit 33 uses the position coordinates (X, Y) of the inputted picture processing start position A to set the internal counter.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an image processing device.

-1-^ City (conventional technology) Image processing 3! I! The device uses a photoelectric conversion element such as a COD to two-dimensionally scan a document, convert it into an electrical signal, and read the signal. The read image signal is converted to digital data and compared with a threshold pattern to generate binary data (
data consisting of O and 1). This binary data is displayed on a CRT after being subjected to various image processing.
Or it is printed out by a printer.

(Problems to be solved by the invention) This type of device uses COD as a photoelectric conversion element,
When reading document information with D, conventionally, image processing could only be performed from a specific position within the effective range of COD. FIG. 4 is a diagram showing a document reading state, where 1 is a document placing table and 2 is a document.

The arrow indicates the reading direction (main scanning direction) of a solid-state image sensor such as a COD (not shown). , W is the effective width of the solid-state image sensor, and A is the starting point of image processing.

In the case of conventional devices, the image processing start point is fixed, so image processing is performed even on parts that are not originals. especially,
The memory size for storing the results after image processing is solid + 1i
If there is only an area corresponding to the effective width W of the i-image element, the image 19
; When the enlargement process is performed, if the original 2 is placed at the +41 center of the original platen 1, the memory will be filled with data in the area outside the original before the image enlargement process reaches the valid part of the original 2. The image overflows and the enlarged image of the original original image cannot be viewed. As described above, according to the conventional device, unnecessary portions 1) + filtering processing are executed, so processing of both image areas that is originally necessary due to the memory capacity of the subsequent stage may be ignored, and , the manuscript had to be placed in a designated position, and handling was troublesome.

(Means for Solving the Problems) The present invention, which solves the above-mentioned problems, includes a document reading section that converts document information into electrical signals and reads them, and an image processing section that calculates the signals from the document reading section. The image processing apparatus having the present invention is configured such that the position at which image processing is started can be arbitrarily set.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of the present invention? It is a 1t1M block diagram. In the figure, 11 is a solid-state image sensor such as a CCD (hereinafter t41 is referred to as COD) that reads document information from the document 2 and converts it into a photoelectric conversion signal, and 12 is a device that converts the photoelectric conversion signal into digital image data for each pixel. An A/D converter 13 is an A/D converter 13 that is used to detect non-uniform sensitivity of the CCD 11 and unrestricted optical system.
Or one line worth of non-uniformity due to unevenness of illumination of the irradiation lamp (memory such as RΔN4 for storing J, 14
15 is a reference clock generation circuit using a crystal oscillator or the like; 15 is a timing control circuit that generates various timing signals based on the reference clock from the Qlil microcircuit 14; 16 is a timing control circuit for generating various timing signals based on the reference clock from the timing control circuit 15; 17 is a shading correction circuit for correcting the image information read by the CCD 11 based on the non-uniform data stored in the memory 13; 18 is a binarization circuit; One is a threshold unit 18 that stores threshold data such as a threshold value or a threshold pattern necessary for the process, and one compares the threshold data stored in the threshold unit 18 with the image information (output of the shading correction circuit 17) obtained by reading the original. a binarization circuit for outputting binary data of image information (<0.1);20;
2 (an image processing circuit that performs processing such as enlarging/reducing the binary data from one fft conversion circuit; 21 an image memory for storing the processing results of the image processing circuit 20; and 22 an image processing circuit for processing the binary data from the one fft conversion circuit); This is an output device such as an IED printer or a laser printer for directly recording the contents or processing results of the image memory 21.The basic operation of the device configured in this way will be explained as follows.

In such a document reading device, the information on the document 2 is
The photoelectric conversion signal obtained by reading the CD11 is A/
The D converter 12 converts each pixel into digital image data.

On the other hand, prior to reading the document information, information on a uniform density plate (for example, a white plate) provided in a non-image area of the reading device is read by the CCD 11, and 14'1 of the information is stored in the memory 13 as non-uniform data. I'll keep it. memory 1
When storing data to 3, an address update signal 1 is obtained from the address control circuit 16.

When reading document information, the non-uniform data stored in the memory 13 is read out in synchronization with the digital image data for each pixel, and the shading correction circuit 17 detects non-uniform data caused by non-uniformity in the optical system or CCD 11 or uneven illuminance. Non-uniform phenomena (shading phenomena) are corrected. The image data subjected to shading correction in this way is combined with the threshold data stored in the threshold unit 18 and the binarization circuit 1.
The data are compared and converted into binary data, transferred to the image processing circuit 20, where the supported processing is performed in real time, and stored once in the image memory 21 or directly recorded on the output device 22.

FIG. 2 is a diagram J showing a specific example of the configuration of the image processing circuit 2o. In the figure, 31 is a multiplexer that receives an input binary data, and 32 is a line memory that receives the switching output of the multiplexer 31, where 11.1 M 1 to 1-
It consists of four M4 line memories. 33 is an enlargement/reduction circuit that receives the output of the line memory 32 and performs enlargement/reduction operations on the image data; 34 receives a synchronization clock (J and multiplexer 31;
and a processing timing circuit that provides timing pulses for operation to the enlargement/reduction circuit 33.

35 receives the magnification setting value, the processing start position setting value, and/or the automatic detection information of the document position, and operates an enlargement/reduction circuit 33.
36 is an enlargement/reduction circuit 33
This is a synchronization circuit that synchronizes the output of the processing timing circuit 3/I with the timing pulse of the processing timing circuit 3/I and transfers it to the image memory 21 or the output device 22 (see FIG. 1). The operation of the image processing circuit 20 configured as described above will be explained as follows.

The binarized binary data is selected by the multiplexer J-31 and stored in the line memory 32. Four line memories [M 1 =
The binary data stored in L M /l is sequentially read out by timing pulses from the processing timing circuit 34 and sent to the subsequent enlarging/reducing circuit 33 .

The enlarging/reducing circuit 33 is configured in synchronization with the data input from the line memory 32 and is provided in advance by the CPU 35.
Perform processing to convert to ζ magnification. The processed binary data is transferred to the subsequent image memory 21 or output device 22 by the same 1111 circuit 36 in synchronized processing timing.

Next, setting of the image processing start position will be explained. The method for providing the automatic detection information of the document position to the CPU 35 is as follows. Assume that the original 2 is placed at an arbitrary position on the original placing table 1, such as J5 shown in FIG. In this case, the document table 1 is preliminarily scanned using an optical system composed of a lens L and a CCD 11. The area where there is no document and the document area can be understood as changes in the detection signal of the CCD 11.

The photoelectric conversion output during this preliminary scan is given to the CPU 35 as digital data. And the CPU
35 changes the digital data by 1/-, and the coordinates (x) of the image processing calculation position FJA of the original 2.

Y) is calculated. Once the position coordinates X and Y of the entry point are calculated, the CPU 35 provides these values to the enlargement/reduction circuit 33.

The enlargement/reduction circuit 33 receives the input image processing start position A.
An internal counter (not shown) is set based on the position coordinates (X, Y) of The control operation is performed by counting 1i.

Then, when the built-in counters count up to X and Y respectively, various internal processing enable signals are set to execute enlargement/reduction processing. Therefore, according to the present invention, image processing calculations are not performed from unnecessary areas, and the original document image does not disappear even in the case of enlargement processing.

Note that the image processing start position information given to the CPU 35 does not necessarily need to be given automatically as described above. Control the CPU 35 using the numeric keypad from the keyboard (not shown) of the operation unit.
may be directly given as X and Y values.

Above) In the explanation of this book, the case of enlarging/reducing binary data was taken as an example, but the present invention is not limited to this, and even if halftone data is enlarged/reduced and converted into binary data, it is possible to stomach. Moreover, it can also be applied to other processing cases.

(Effects of the Invention) As described above, according to the present invention, since the image processing start position can be arbitrarily set, efficient image processing is possible. Furthermore, since only the processing results of the necessary portions of the image memory are stored, the utilization efficiency is also high.

[Brief explanation of the drawing]

FIG. 1 is a configuration block diagram showing one embodiment of the present invention, and FIG.
FIG. 3 is a diagram showing a specific configuration example of the image processing circuit, FIG. 3 is an explanatory diagram of automatic calculation of the image processing start position, and FIG. 4 is a diagram showing a document reading state. 1... Document placement table 2... Document 11... Solid-state image sensor 12... A/D converter 13... Memory 14... Reference clock generation circuit 16... Address control circuit 17. ...Shaping correction circuit 18...Threshold value unit 19...2) Overlapping circuit 2o
...Image processing circuit 21...Image memory 22...
Output device 31...Multiplexer 32...Line memory 33...Enlargement/reduction circuit 34...Processing timing circuit 35...CPU 36...Synchronous circuit Patent applicant Roku Konishi Photo Industry Co., Ltd. Agent Person Patent attorney Fuji Ijima 1 person from outside the city

Claims (2)

[Claims] (1) In an image processing device that includes a document reading section that converts document information into electrical signals and reads them, and an image processing section that calculates signals from the document reading section, the position at which image processing starts can be arbitrarily set. An image processing device characterized in that it is configured to perform. (2) Preliminarily scan the document placement section with a photoelectric conversion element to detect the initial position of the document, obtain the position to start the image processing based on the initial position, and determine the position to start the image processing; Claim 1, characterized in that the change is automatically made according to the position of the document in the document reading section.
The image processing device described in Section 1.