JPS62277852A - Picture signal processor - Google Patents

Abstract

PURPOSE:To obtain a picture signal processor to which picture signals obtained from a CCD image sensor are connected naturally at the midpoint of an original by providing a control circuit sensing overlapped part of each CCD image sensor and controlling the read address of a picture memory. CONSTITUTION:The titled device consists of CCD image sensors 5, 6, lenses 7, 8 and a length finding original 9. In using the plural CCD image sensors 5, 6, plural lines are drawn on the face of the length finding original 9 and the overlapped part of the CCD image sensors 5, 6 is detected at the read of a picture signal and the read address of the picture memories 18, 19 to eliminate the overlap is controlled by a read control circuit 21. Thus, the position of the CCD image sensors 5, 6 has only to be adjusted roughly to obtain picture signals connected naturally at the midpoint 13 of the original.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to an image signal processing device used in an image input device or the like.

2. Description of the Related Art As one of conventional image input devices, a device using a CCD image sensor as a sensor for converting grayscale information of a document into an electrical signal is known. FIG. 5 shows an example of this. In the figure, 1 is a document, 2 is a light source, 3 is a CCD image sensor, and 4 is a lens. 4, the image is formed on the CCD image sensor 3, and its gradation information is scanned to form an image on the CCD image sensor 3.
It is converted into a time-series electrical signal as shown in the figure. Here, the greater the amount of light hitting the CCD image sensor 3, the more
In other words, the closer to white the top of the original 1 is, the smaller the output of the CCD image sensor 3 becomes. The image signal shown in FIG. 6 is used after being binarized using an appropriate threshold value, or used as image data having halftones through an A/D converter.

However, as the document becomes longer, it is necessary to increase the number of elements in the CCD image sensor, and the existing CCD image sensor does not have enough elements, so it becomes necessary to use a plurality of CCD image sensors. Now, a case will be explained in which two CC and D image sensors are used.

In Figure 7, 5 and 6 are CCD image sensors, 7.8
is a lens, 9 is a document, and the overlapping portion 10 of the CCD image sensor 5 and CCD image sensor 6 is almost 0.
Indicates the state where it is adjusted. In this state, the CCD
All image signals obtained by the image sensor 5 and the CCD image sensor 6 are valid, which is the most ideal state. However, it is very difficult to adjust to the state shown in the figure, and it takes a lot of adjustment time.

FIG. 8 shows a state in which there is no overlapping portion between the CCD image sensor 5 and the CCD image sensor 6, and a vacant portion 11 is created. In this case, the image data of the original is missing, and the CCD image sensor 5 and CCD image sensor 6
The image signals obtained by this method are unnaturally connected in the middle part of the document.

In FIG. 9, there is an overlapping portion 12 between the CCD image sensor 5 and the CCD image sensor 6, resulting in overlapping image data of the original. In this case, as in FIG. 4, the image signals obtained by the CCD image sensor 5 and the CCD image sensor 6 are unnaturally connected in the middle part of the document.

Problems to be Solved by the Invention As described above, when a plurality of CCD image sensors are used, the image signals obtained by each CCD image sensor are usually unnaturally connected in the middle part of the document.

The present invention solves the above problems, and provides image signal processing in which when a plurality of CCD image sensors are used, the image signals obtained by each CCD image sensor are naturally connected in the middle part of the document. The purpose is to realize the device.

Means for Solving the Problems In order to solve the above problems, the present invention draws a plurality of lines on the surface of the document for length measurement, detects the overlapping portion of each CCD image sensor when reading out the image signal, and eliminates the overlap. Similarly, a readout control circuit is provided to control the readout address of the image memory.

Effect By using the above means, when using a plurality of CCD image sensors, the image signals obtained by simply adjusting the positions of each CCD image sensor are naturally connected in the middle part of the document. I can do things.

Example An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 9 denotes a document for length measurement, which is placed outside the reading range of the document. Reference numeral 13 denotes the middle portion of the original for length measurement 9, which corresponds to the vicinity of the connecting portion between the CCD image sensor 5 and the CCD image sensor 6. Reference numerals 14 and 15 are length measurement lines drawn on both sides of the length measurement document 9, sandwiching the middle portion 13 therebetween.

FIG. 2 is a diagram showing the configuration of this embodiment, in which the CCD image sensor 5. The CCD image sensor 6 is composed of a lens 7, a lens 8, and a length measurement document 9 shown in FIG. 1, and is arranged so that the reading ranges of the image sensors 5 and 6 slightly overlap. CCD image sensor5. Image signals obtained from the CCD image sensor 6 are sent to binarization circuits 16 and 17.
The signal is then stored in the memory 18 and the memory 19 as digital signal data. 2o is a CCD image sensor 5. A write timing control circuit 21 controls the timing for writing image signals obtained from the CCD image sensor 6 into the memory 18 and the memory 19, and a write timing control circuit 21 reads the image data stored in the memory 18 and the memory 19 to the host CPU or an external interface circuit. This is a readout control circuit for In the figure, the distance between the length measurement lines 14 and 15 is determined to be a constant length (L), and the CCD image sensor 5
The overlapping portion of the length D) of the CCD image sensor 6 is located between the length measurement lines 14 and 15.

Digital signal data in memory 18 and memory 19 in FIG. 2 is as shown in FIG. 3. In other words, in the part of the length measurement document 9 that is white data, 1. The black data part is stored as 0, and the overlapping part of the CCD image sensor 5 and the length D) of the CCD image sensor 6 is 6 in the same figure.
It has a bit length. In the figure, the interval between lines 14 and 15 for length measurement is 13 bits, but the memory 1
When the digital signal data of 8 and memory 19 are read out continuously, an overlapping part of length D) is added to make 19 bits, and the image signals obtained by CCD image sensor 5 and CCD image sensor 6 are not correct in the middle part of the document. Connect naturally. The readout control circuit 21 in FIG.
The read address of the memory is controlled so as to omit the overlapping part (D) of the D image sensor 6, thereby making it possible to create a natural connection in the middle part of the document. That is, as shown in the flowchart of FIG.
For the CD image sensor 5, set the read start address of the memory 18 to O to read out the entire memory 18, and for the CCD image sensor 6, set the read start address of one memory to O, and read the entire memory 18.
The bit number D of the overlapping part of the CD image sensor 6 (8th
In the case of FIG. 6), the entire memory 19 is read out.

Effects of the Invention As described above, according to the present invention, when using a plurality of CCD image sensors, a plurality of lines are drawn on the document surface for length measurement, and when reading out image signals, the overlapping portion of each CCD image sensor is detected. By providing a readout control circuit that controls the readout address of the image memory, we can create a natural connection in the middle of the document by simply adjusting the position of each CCD image sensor. It is possible to obtain an image signal that

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a length measurement document with a plurality of lines used in an embodiment of the present invention, and FIG. 2 is a block diagram showing the configuration of an image signal processing device in an embodiment of the present invention. ,
FIG. 3 is a diagram showing the storage state of digital signal data in the memory in FIG. 2, and FIG. 4 is a flowchart showing the operation of the read control circuit 21 in this embodiment.
Fig. 5 is a diagram showing the configuration of a general image input device, Fig. 6 is a diagram showing that grayscale information of a document is converted into a time series electric signal by a CCD image sensor, and Fig. 7 is a diagram showing two CCD image sensors. A diagram showing a state in which the overlapping part of the image sensors is almost adjusted to O, FIG. 8 is a diagram showing a state in which there is no overlapping part between two CCD image sensors and a vacant part has been created, and FIG. 9 is a diagram showing a state in which two CCD image sensors FIG. 4 is a diagram illustrating a state in which image sensors have an overlapping portion and image data of a document overlaps. 5.6... CCD image sensor 7.8... Lens 9... Document for length measurement 14.15... Multiple lines for length measurement 16.17.
... Binarization circuit 18.1.9 ... Memory 20 ... Write timing control circuit 21
...Name of readout control circuit agent Patent attorney Toshio Nakao et al. 12 Figure 1 Figure 2 Figure 753 Figure 5 Figure 6 Chima

Claims (1)

[Claims] A plurality of CCD image sensors that scan independently, and each CCD image sensor
A memory that stores the image output signal of the CD image sensor, and a readout control circuit that controls the readout address of the memory so as to eliminate the overlapping portion of each CCD image sensor based on the image signal obtained when reading the original for length measurement. An image signal processing device having: