CN1665267A - Method of Sensing Exposure Source Intensity to Modulate Image Signal - Google Patents

Abstract

A method for sensing the intensity of exposure source to modulate image signal is applied to scan a file to obtain a photoelectric output signal corresponding to each pixel at different position in the file before the brightness of the light source is not stable after the optical scanning device is started up, and then the photoelectric output signal is transmitted to the storage unit of the optical-mechanical module to adjust a black/white balance table in the storage unit and the parameter setting of a special application integrated circuit to carry out the brightness compensation of each pixel so as to generate an image data after the file is scanned in real time.

Description

Method of Sensing Exposure Source Intensity to Modulate Image Signal

technical field

The invention relates to a method for sensing the intensity of an exposure source to modulate an image signal, in particular to a method for generating a real-time scanning or previewing effect after the optical scanning device is turned on but before the luminance of the light source is not stabilized. A method of measuring the intensity of the exposure source to modulate the image signal.

Background technique

A scanner is a device for capturing images. Taking a traditional flatbed scanner as an example, its basic equipment includes: a glass platform (Window) for carrying objects to be scanned (which can be documents or pictures) , and an optomechanical module for converting images into electrical signals; and the core of the optomechanical module is an image sensing component (Image sensor) and a lens ( Lens), the image sensing component (such as CCD) has many image sensing pixels, with the different intensity of light received by each image sensing pixel, the charge is accumulated to form a pressure difference, and then through the analog/digital converter (A/D Converter ) into a digital electrical signal to convert the original image into an electronic file, so that the user can perform image processing, editing, storage and output in the computer software.

In general scanners or multi-function business machines, the optomechanical modules mostly use Cold Cathode Fluorescent Lamp (CCFL) as the main document exposure source.

Although the cold-cathode tube has the advantages of high brightness, low power consumption, and long service life, its main disadvantage is that whenever the user restarts the scanner or multi-function machine, the glass shown in Figure 1 The platform 10 and its corresponding coordinate axes are taken as an example for illustration. After a period of warm-up (Warm up) time, the luminance of the lamp tube is slowly increased to a stable state as shown in FIG. 2 (that is, corresponding to the image When the sensing component is at the Yn position in Fig. 1, the captured pixel (X-axis) and its corresponding photoelectric output signal are shown in Fig. The characteristics of the cathode tube are fixed, and the brightness compensation of each point is performed by the black/white light balance table (shading table) uploaded in the memory of the scanner or the multi-functional business machine, and then the work of image scanning can be started.

Under normal temperature, the warm-up time is about 1-3 minutes. However, for some cold zone countries, users have to wait for a longer period of time before starting to use the scanner, causing considerable inconvenience to users. Inconvenient, and some users even mistakenly believe that the long waiting time is the reason for the system crash, and request to return the product.

Therefore, in an environment where products are increasingly competitive, how to reduce the waiting time of scanners or MFPs before cold scanning, so that they have instant-on and ready-to-use functions, will be a very important issue.

Contents of the invention

In view of the problems of the above known technologies, the object of the present invention is to provide a method for sensing the intensity of an exposure source to modulate an image signal, which can be applied to an optical scanning device, such as a scanner or a multifunctional business machine. The scanning device includes a light source, an image sensing component and a storage unit. When the user turns on the device and the luminance of the light source is not yet stable, the brightness of each pixel can be compensated to perform real-time scanning or preview printing operations, so as to save the user the time spent waiting for the light source to warm up. The scanner or the multi-function business machine has the function of instant use, which increases the convenience of the user's operation.

In this method, after the user turns on the device and before the luminance of the light source reaches a stable state, a file is scanned to obtain a photoelectric output signal corresponding to pixels at different positions in the file.

Then, the obtained photoelectric output signal is transmitted to the storage unit of the optical-mechanical module, so as to adjust a black/white light balance table and a parameter setting of a special application integrated circuit in the storage unit, so as to perform brightness compensation of each pixel, Simulate the brightness condition when the light source is stable, and generate an updated black/white light balance table.

Finally, the photoelectric output signal corresponding to each pixel is compensated with the updated black/white light balance table, so as to generate an image data of the scanned document in real time, so that the image data generated after scanning will not be affected by the brightness of the light source. In this way, the entire process of the method for sensing the intensity of the exposure source to modulate the image signal is completed.

In order to further understand the purpose, structural features and functions of the present invention, the detailed description is as follows in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is a schematic diagram of a glass platform and its corresponding coordinate axes;

FIG. 2 is a diagram showing the relationship between each captured pixel (X-axis) and its corresponding photoelectric output signal when the image sensing component of the optomechanical module is at the Yn position;

3 is a flow chart of the method of sensing the intensity of the exposure source to modulate the image signal according to the present invention;

Fig. 4 is the relationship diagram between the pixel at each position on the Y axis and its photoelectric output signal; and

Figure 5 is the pixel at each position (Y ₁ , Y ₂ .....Y _n ) on the Y-axis of the file obtained after the relationship between the pixel at each position on the Y-axis and its photoelectric output signal is assembled The relationship diagram with its photoelectric output signal.

In the picture:

10 glass platform

Step 20 After the user turns on the power, but before the luminance of the light source reaches a stable state, scan the

  Tracing a file to obtain a photoelectric output signal corresponding to each pixel in the file

Step 21 Send each photoelectric output signal to a storage unit to adjust the

   A black/white light balance meter and a parameter setting for a dedicated application integrated circuit for each

Compensate for pixel brightness and generate an updated black/white balance table

Step 22 Compensate the photoelectric output signal corresponding to each pixel with the updated black/white light balance table

No. to generate an image data of the scanned document in real time

Detailed ways

The method of sensing the intensity of the exposure source to modulate the image signal of the present invention is applied to an optical scanning device, such as a scanner or a multifunctional business machine. The optical-mechanical module of the optical scanning device includes a light source and an image Sensing component and a storage unit.

A black/white light balance table is uploaded in the storage unit. When the user wants to scan a document or print a preview, he needs to use the black/white light balance table to compensate the brightness of each point, so as to avoid the light caused by the lamp itself. The luminance of the positions is different, which causes the scanned image data to be too dark or too bright.

When the user turns on the power and before the brightness of the light source reaches a stable state, the method disclosed in the present invention can be used to compensate and correct the brightness of each pixel to perform real-time scanning or preview printing operations. In this way, savings can be saved. Lower the time for the user to wait for the lamp to warm up for real-time scanning or preview printing.

Please refer to FIG. 3 , which is a flow chart of the method for sensing the intensity of the exposure source to modulate the image signal according to the present invention. The description is as follows:

Firstly, after the user turns on the device and before the luminance of the light source reaches a stable state, scan a file to obtain a photoelectric output signal corresponding to each pixel in the file (step 20 ).

Firstly, the entire document is scanned by the image sensing component in the optical scanning device. Take the coordinate axis of the glass platform 10 shown in FIG. ₁ as an example for illustration. _n position _{, and scanning in the X direction (X 1 , X 2 .}

When scanning in the X direction of one of the positions on the Y axis is completed, the relationship diagram between each pixel and its photoelectric output signal as shown in FIG. 4 can be obtained. After the relationship between the pixel at each position on the Y axis and its photoelectric output signal is assembled, each position of the Y axis on the file as shown in Figure 5 (Y ₁ , Y ₂ . . . Y _n ) The relationship between the pixel and its photoelectric output signal.

Afterwards, each photoelectric output signal is sent to a storage unit to adjust a black/white light balance table and a parameter setting of a special application integrated circuit in the storage unit, so as to perform brightness compensation of each pixel, and generate an updated The black/white light balance table (step 21).

Send the relationship between the pixel at each position (Y ₁ , Y ₂ .....Y _n ) of the Y axis on the document to be scanned and its photoelectric output signal shown in Figure 5 to a black/white light balance table in the storage unit , and use interpolation (Interpolation) or multiplication algorithm (for example: multiply the photoelectric output signal of the pixel at a certain position Y _i on the Y axis by a multiple, so that the photoelectric output signal can be enlarged or reduced at the same time) In this way, brightness compensation of each pixel is performed, and an updated black/white light balance table after compensation calculation is generated.

Finally, the photoelectric output signal corresponding to each pixel is compensated with the updated black/white light balance table, so as to generate an image data of the scanned document in real time (step 22 ).

Compensate the photoelectric output signal corresponding to each pixel with the updated black/white light balance table, so as to adjust its brightness to an image data similar to that scanned by the lamp tube in a stable state, and will not be unstable due to the brightness of the lamp source As a result, the image data generated after scanning is too dark, and at the same time, a real-time preview and print display can be provided for the user.

The above are only preferred embodiments of the present invention, and are not intended to limit the implementation scope of the present invention; that is, all equivalent changes and modifications made according to the patent scope of the present invention are covered by the patent scope of the present invention.

Claims (4)

1. a sensing exposure source intensity is with modulation signal of video signal method, be applied to an optical scanner, this optical scanner includes a lamp source, an image sensing component and a memory cell, when the briliancy in this lamp source is not stablized as yet, by compensating the brightness of each pixel, to carry out real time scan or print preview operation, wherein comprise the following step:

Scan a file, to obtain corresponding to a photoelectric output signal of each pixel in this document;

Transmit respectively this photoelectric output signal to this memory cell, adjusting the black/white photo-equilibrium table in this memory cell and the parameter setting of a specialized application integrated circuit, carrying out the luminance compensation of each pixel, and produce a black/white photo-equilibrium table after upgrading; And

Compensate corresponding this photoelectric output signal of each pixel with the black/white photo-equilibrium table after this renewal, with the image data after real-time generation this document scanning.

2. sensing exposure source intensity as claimed in claim 1 is with the method for modulation signal of video signal, wherein should scan a file, to obtain corresponding to the step of a photoelectric output signal of each pixel in this document, be this image sensing component scanning this document by this optical scanner.

3. sensing exposure source intensity as claimed in claim 1 is with the method for modulation signal of video signal, wherein should transmit respectively this photoelectric output signal to this memory cell, to adjust the black/white photo-equilibrium table in this memory cell and the parameter setting of a specialized application integrated circuit, to carry out the luminance compensation of each pixel, and produce the step of black/white photo-equilibrium table after upgrading, be that relation with the pixel of each position on the Y-axis of scanning this document gained and its photoelectric output signal is sent to the black/white photo-equilibrium table in this memory cell, and with the interpolation method computing, to carry out the luminance compensation of each pixel.

4. sensing exposure source intensity as claimed in claim 1 is with the method for modulation signal of video signal, wherein should transmit respectively this photoelectric output signal to this memory cell, to adjust the black/white photo-equilibrium table in this memory cell and the parameter setting of a specialized application integrated circuit, to carry out the luminance compensation of each pixel, and produce the step of black/white photo-equilibrium table after upgrading, be that relation with the pixel of each position on the scanning this document resulting Y-axis and its photoelectric output signal is sent to the black/white photo-equilibrium table in this memory cell, and with the computing of multiplication mode, to carry out the luminance compensation of each pixel.

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