JPS63290073A - Reader for color picture - Google Patents

Abstract

PURPOSE:To prevent dislocation by executing signal processing at every color line sensor from the color line sensors to a delay means, executing writing into separate memories at every color and executing synchronization and reading respective memories of respective colors in the order of a main scanning direction at the time of reading so as to make picture data of respective colors into one line. CONSTITUTION:An analogue/digital converting means 3 which analogue signal- processes the outputs from respective color line sensors 1 and which makes the outputs into digital multi-level signals, a delay means which delays the outputs, and a digital processing means 4 including a storage means which stores the outputs from the delay means for plural lines by colors are provided. The signal processing is executed at every color line sensor 1 from the color line sensors 1 to the delay means. The storage means executes writing into other memories at every color at the time of writing picture signals, and synchronizes and reads respective memories of respective colors and makes picture data of respective colors into one line. Thus, data of respective colors without dot deviation can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a color image reading device, and more specifically,
The present invention relates to a color image reading device that can be applied to digital copying machines, facsimile machines, electronic files, etc. that handle image information electrically.

(Prior Art) An image reading device that arranges a plurality of color line sensors in a staggered manner so that the reading lines of adjacent color line sensors are different and converts the data into one line is known, for example, from Japanese Patent Application Laid-Open No. It is disclosed in the publication No. 61-134168.

In this publication, the one-line circuit detailed in connection with FIG. 13 is taken as an example. In this circuit, when sampling and holding the output of the CCD, each color (C
y, G, Ye), three subsequent circuits are required for the ICCD. Therefore, for a sensor composed of five CODs, a total of 15 circuits are required, which increases the number of circuits and increases the cost.

(Purpose) The present invention has been made to eliminate the drawbacks of the conventional device described above, and its purpose is to output each color sequentially and at high speed from a plurality of color line sensors arranged in a staggered manner. To provide a color image reading device capable of color-separating and converting image signals into one line with a simple and low-cost circuit configuration, and outputting data of each color without dot shift.

(Structure) In order to achieve the above object, the present invention provides a color image reading device that converts color-sequential image data from a color line sensor into one line, in which a plurality of color lines are arranged in a staggered pattern and are outputted in color-sequential order. a sensor, a processing means for processing the output from each color line sensor into an analog signal, an analog/digital conversion means for converting the output from the processing means into a digital signal (direct signal), and an analog/digital conversion means for converting the output from the analog/digital conversion means into a digital signal. Digital processing means including a delay means for delaying and a storage means for storing output from the delay means for a plurality of lines for each color, and signal processing is performed for each color line sensor from the color line sensor to the delay means. , the storage means is characterized in that when writing an image signal, it writes in a separate memory for each color, and when reading out, it synchronously reads out each memory for each color in the order of the main scanning direction, thereby converting the image data of each color into one line. This is what I did.

Hereinafter, a detailed explanation will be given based on one embodiment of the present invention.

First, a method of using a color same-size sensor as an image sensor for photoelectrically reading a color original will be described.

This method has the advantage that the single needle for imaging light can be simplified and the apparatus can be made smaller, and color separation is performed by the sensor itself, so color shift in the main scanning direction does not occur. As shown in Figure 1, a color equal-magnification sensor has a resolution of 16 pixels/tsuru, and one pixel is divided into segments for each color [for example, red (R), green (G), blue (B)], and each Each color filter is mounted on the segment.

However, if such a sensor can read the width direction (297 m) of an A3-sized paper, then 4
It requires 752 pixels, or 14256 segments. Since it is technically difficult to configure such a large number of light receiving elements with one color line sensor, a plurality of color line sensors are arranged side by side in the scanning direction. Also,
As shown in Figure 2, the CCD sensor used as a color line sensor has light-insensitive parts at both ends.
If the sensors are arranged in a single line, the document image cannot be read at the joint between the sensors, so color equal-magnification sensors have been proposed in which the sensors are arranged in a staggered manner so as to create overlapping areas, as shown in FIG.

The color equal-magnification sensor shown in FIG. 3 is composed of five CCDs, and drive signals and output signals are input and output independently. Because they are arranged in a staggered manner, there is a shift in the reading positions of the odd and even CCDs in the sub-scanning direction, but there is a built-in line memory (7 stages of line shift gates are also included) to correct this. , the sensor outputs video signals obtained by dividing the document into 5 parts in 5 systems in parallel and in GBR color order.The internal circuit of such a CCD is shown in Figure 4.In the figure,
OIA is the first phase clock, 02A is the second phase clock, 0
2B is the second phase final stage clock, Ov1 to OV7 are line shift gates, SH is shift gate, R3 is reset gate, OD is output transistor drain, O3 is output transistor source, SS is substrate (ground)
, ■G is an input gate, HE is a barrier electrode, and SE is a storage electrode.

Next, FIG. 5 shows a block diagram regarding image data of the color image reading device used in the present invention.

In the figure, 1 is a color equal-magnification sensor, 2 is an analog processing unit, and 3
4 is an analog/digital (A/D) conversion section, 4 is a digital processing section, 5 is an interface section, and 6 is a timing control section. CCD 1 from the above-mentioned color life-size sensor 1
~The video output signal of the CCD 5 is input to the analog processing section 2. The analog processing section 2 samples and holds the sample and then amplifies it, and performs dark aa correction, white level correction, and shading correction for each COD signal.The output signal from the analog processing section 2 is quantized by the A/D conversion section 3. and converted into 8-bit digital signals. Shading data 5HDI when reading the white shading board before reading the original
~5HD5 is stored in the shading correction memory of the analog processing section 2.

When reading a document, each 8-bit digital signal CCD1 to CC
D5 is output to the digital processing section 4. This digital processing 4 is comprised of a delay means for synchronizing the reading position of the signals from each COD and a storage means for forming one line for each color. G, B.

The output from the digital processing section converted into an 8-bit signal for each color of R is output at the interface section 5 in synchronization with the line synchronization signal and pixel clock signal from the host side or from the reading device itself.

The timing control unit 6 generates a timing number 48 for each block to perform each function and gives it to each block.

Next, the circuit configuration and operation of the digital processing section 4 described above will be described in detail with reference to the circuit diagram shown in FIG. In the figure, a portion (a) indicated by a dotted line is a delay means, and a portion (b) is a one-line storage means. From the structure of the sensor, CCD2. CCD4 is CCD1. Since the part ahead of the document is read by CCD3 and CCD5, synchronization is achieved using the line memory in the sensor and the delay means (a).
The five No. 13 signals are outputted to the one-line storage means (b) as signals of the same line and the same pixel. In FIG. 6, M is a line memory, and the CCD2 and CCD4 systems have N stages of line memories. N is determined by the variable magnification range. For example, if the variable magnification range is 25% to 400%, the sub-scanning measure will be 4 times to 1/4 times that of the same magnification, so a total of 16 steps of delay is required. becomes. Since the line memory in the sensor can provide a delay of 7 stages, the delay becomes N-9, and a line memory for 9 stages is required. Enable gates 0 to 9 corresponding to the memory depending on the scaling factor and
Select 9 stages of delay. In this way (the inputs to the b1 part are aligned on the same line and the same pixel, so G.

The colors of B and R are also the same for all five systems.

MGI to MG5 of the one-line storage means Tb) are CCD1
-A memory that stores G data of each CCD 5. Since the writing and reading timings to the memory overlap, the capacity of each memory needs to be at least the amount of data for two lines of each color.

The write operation to the memory will be explained with reference to the timing chart of FIG. In this embodiment, the memory has independent ports for input and output, and is a first-in-first-out (FIFO) type that does not require address input.
Use memory.

Within one line period between the line synchronization signals LSYNC, 960 pixels of each system, that is, 2880 pieces of data are inputted in the G, B, and R color order from the delay means (♂). These data are MG1-5. Sequentially write to the memories M81-5MR1-5. G.W.E.

RWE and RWE are write enable signals for each memory, and if signals are given to each memory at the timing shown in Figure 7, data will be written at the next rise of the write clock signal WCLK after the write enable signal goes low. . As a result, one line of color sequential data is stored in a separate memory for each color.

For example, for CCD1 system, MCI is 01-096.
0, 81 to B960 for MHI, R1 to R9 for MRI
Data of 60 8 bits x 960 words each is written. Since each memory stores data for two lines, the write reset signal R3W is applied once for every two lines.

Next, FIG. 8(A) shows the read operation from the memory.

This will be explained with reference to the timing chart (B).

Within one line period between L, S Y N C, CCDI ~
Each memory of each color is read out in the order of the five CCD systems in synchronization, and G, B, and R data are combined into one line.

When the read enable signal RE is rLJ, data is read at the rising edge of the read clock signal RCLK. Therefore, as shown in FIG. 8(A), RE (CCD
If 960 clock molecules LJ are sequentially sent from I) to RE (CCD5), the above data 1
It becomes possible to create a line.

FIG. 8(B) is an enlarged view of FIG. 8(A).

RE (CCD
When i) is "L", the 1st to 960th data of each color are output, and then when RE (CCD2) is rLJ, 9
The 61st and subsequent numbers are output. In this way, the 1st to 4800th data of each color for one line is output. The read reset signal R3R is applied once to two lines. Within the same line period, the memory space to write and the memory space to read are different, and the data to be read is the data written one line period ago, so the write reset signal R3W and read reset signal R3R are applied alternately every other line period. Ru.

Although a FIFO memory is used in this embodiment, it is also possible to use a dual port memory. In that case,
By adding address signals for input and output,
Similarly, one line of data is achieved.

(Effects) According to the present invention, in a color image reading device that converts color-sequential image data from a color line sensor into one line, a plurality of color lines that are arranged in a staggered pattern and output color-sequentially are used. A sensor, a processing means for processing the output from each color line sensor into an analog signal, and an analog/processing means for converting the output from the processing means into a digital multi-value signal.
digital conversion means; digital processing means including a delay means for delaying the output from the analog/digital conversion means; and a storage means for storing the output from the delay means for a plurality of lines for each color; Up to the delay means, signal processing is performed for each color line sensor, and the storage means writes each color in a separate memory when writing the image signal, and synchronizes each memory for each color in the order of the main scanning direction when writing the image signal. Since the image data of each color is read out and converted into one line, the color-sequential image data from the color line sensor can be color-coded and converted into one line using a simple and low-cost circuit configuration. Color image reading devices are available.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram illustrating a color equal-magnification sensor, Figure 2 is an explanatory diagram showing each area of a CCD sensor used as a crawler sensor, and Figure 3 is a diagram showing five CCDs arranged in a staggered manner.
4 is a circuit diagram showing the internal circuit of the COD, FIG. 5 is a block diagram regarding image data of a color image reading device using the present invention, and FIG. FIG. 5 is a circuit diagram showing the circuit configuration of the digital processing section in detail; FIG. 7 is a timing chart explaining the write operation to the memory; FIG. 8(A) is a timing chart explaining the read operation from the memory; FIG. 8(B) is a timing chart showing an enlarged version of FIG. 8(A). 1...Color line sensor (color same size sensor), 2
... analog processing section (means), 3 ... A/D conversion section (means), 4 ... digital processing section (means). What is the collection of songs? Roro ω mouth

Claims (4)

[Claims] (1) In a color image reading device that converts color-sequential image data from a color line sensor into one line, a plurality of color line sensors are arranged in a staggered manner and output color-sequentially, and the output from each color line sensor is A processing means for processing an analog signal, an analog/digital conversion means for converting the output from the processing means into a digital multi-value signal, a delay means for delaying the output from the analog/digital conversion means, and an output from the delay means. digital processing means including storage means for storing a plurality of lines for each color; signal processing is performed for each color line sensor from the color line sensor to the delay means; and the storage means performs signal processing for each color when writing image signals. 1. A color image reading device characterized in that image data of each color is written into a separate memory, and when read, each memory of each color is synchronously read out in order in the main scanning direction, thereby converting image data of each color into one line. (2) The storage means is first-in-first.
A color image reading device according to claim 1, characterized in that the color image reading device comprises an out-memory. (3) The color image reading device according to claim (1), wherein the storage means comprises a dual port memory. (4) The color image reading device according to claim (2), wherein the first-in first-out memory is constituted by a random access memory.