JP2516921C - - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image information reading / storing device used for reading a document in a full-color copying machine or the like and storing the data in a memory. 2. Description of the Related Art Conventionally, a dichroic mirror is used to read a color image, for example, a color original, and the reflected light from the original is red (hereinafter, referred to as R), green (hereinafter, referred to as G), and blue (hereinafter, referred to as B). ) Are separated into three primary colors of light, and this is irradiated onto three image sensors such as CCDs to obtain respective color densities. One example is shown in FIG. Reference numeral 16 denotes a dichroic mirror and a lens for separating reflected light from a document into three primary colors such as R, G, and B. 17, 18, and 19 are R, G,
Image sensors such as CCDs corresponding to B-separated light, 20, 21, and 22 denote output buffer amplifiers of the corresponding image sensors, and 23, 24, and 25 denote analog-digital converters that convert the outputs of the corresponding buffer amplifiers into digital data. Converters (hereinafter referred to as A / D converters), 26, 27, and 28 correspond to corresponding A / D converters, respectively.
This is a line memory that stores the output of the D converter in synchronization with the clock Φ. Reference numeral 29 denotes a control clock circuit that supplies a start signal and a clock signal of the image sensor. Reference numeral 30 denotes a write address counter that is reset by the start signal and counts +1 at the rising edge of the clock signal. Hereinafter, the operation from the time when the R separated light enters to the time when the R color data is output will be described. When a start signal is input from the control clock circuit 29, the R separated light receiving image sensor 17 on which the R separated light from the color original is incident transmits data sequentially according to the clock signal Φ. Next, after the transmitted data is amplified to a certain level by the buffer amplifier 20, the A / D converter 23
Thus, the output data of the image sensor 17 is converted into digital data, and the digital data is written into the line memory 26 to be R color data. Since the R / W (read / write) line of the line memory 26 is set to the “L” level by an external device such as a CPU and is in the write mode, the write address counter 3
Since 0 is added by +1 at the rise of the clock signal Φ, output data from the image sensor is sequentially digitized and written to the line memory 26. All data from the image sensor is written,
When the next start signal is output from the control clock circuit 29, the external device such as the CPU
The R / W signal is set to “H”, and the line memory 26 is set to the read mode. Where C
An external device such as a PU gives a read address to the line memory 26, and the image sensor 1
7 is read. In this manner, R color data of a color original or the like can be read. Similarly, G and B data can be read out, and color data of a color original can be read out. Problems to be Solved by the Invention However, in such a configuration, considering that the dichroic mirror for separating the three primary colors such as R, G, and B is expensive, and that three circuits after the image sensor are required. It is very expensive as a whole. Therefore, in recent years R
, G, B, etc., a color image sensor capable of simultaneously reading three primary colors with one device has been announced. This is one in which R, G, and B filters are sequentially formed on-chip in an image sensor light receiving portion. FIG. 6 shows the structure, and FIG. 7 shows an operation time chart thereof. However, as can be seen from FIG. 7, the R, G, B color data is output in series in the order of R1, G1, B1, R2,. However, there is a disadvantage that the color separation circuit becomes complicated. Means for Solving the Problems In order to solve the above problems, the present invention provides an image signal converting means for converting a read image signal into a plurality of primary color signals, and a scanning start signal and a clock signal for starting image reading. Control clock means for outputting, a frequency dividing means for receiving a clock signal from the control clock means, and outputting a first address indicating a registration area in which each of constituent signals constituting a primary color signal is to be stored; A second address indicating a registration order in the registration area of a constituent signal constituting the primary color signal is output based on a clock signal received from a clock unit and an upper address signal of a first address received from the frequency dividing unit. A binary counter that outputs the primary color signal output by the image signal conversion unit and a first counter output by the frequency division unit and the binary counter. And image signal storage means for storing the constituent signals in different registration areas for each of the constituent signals in accordance with the second address. According to the present invention, the color data of the three primary colors output from the color image sensor in order and serially is stored in the memory in the memory in a manner aligned for each primary color. FIG. 1 is a block diagram showing an embodiment of an image information reading / storing device according to the present invention. In FIG. 1, reference numeral 1 denotes an optical lens for condensing reflected light from a subject such as a color original and forming an image, 2 denotes a color image sensor that outputs color data corresponding to the formed image, and 3 denotes a color image sensor. A buffer amplifier for amplifying the data to a certain level, an A / D converter for converting the amplified color data into a corresponding digital value, a digital value corresponding to the color data, and an access by an external device. A line memory unit from which color data is read out.
The read mode and the write mode are switched by the W signal. Reference numeral 6 denotes a control clock circuit that supplies a start signal (scanning start signal) and a clock signal Φ to the color image sensor 2. Reference numeral 7 denotes a 1/3 frequency divider which is reset by a start signal and receives a clock signal 2Φ. The output of the internal flip-flop is C0 in the lower order and C1 in the upper order. The upper address becomes 2 bits when performing. 8 is reset by a start signal and the C
This is an n-bit binary counter that counts up by one signal, and serves as a lower address when writing color data to the line memory unit 5. Hereinafter, the operation will be described. The color data corresponding to an object such as a color original is synchronized with the clock signal Φ from the time when the start signal is output from the control clock circuit 6 by the color image sensor 2 as shown in FIG. , R2, G2, B2,…, Rn-1, Gn-1, Bn-1, Rn, Gn, Bn
Are output in the order of the three primary colors. After the signal (OS) is amplified to a certain level by the buffer amplifier 3, it is converted into a digital value by the A / D converter 4. On the other hand, when the clock signal 2Φ from the control clock circuit 6 is input to the １ ／ frequency divider 7 as shown in FIG. 2, the C0 and C1 signal outputs as shown in FIG. 3 are obtained. The C1 signal is also input to the n-bit counter 8, and its output is an n-bit output from W0 to Wn. Writing is performed to the line memory unit 5 using W0 to Wn as lower addresses, C0 and C1 as upper 2-bit write addresses, and color data digitized by the A / D converter 4 as input data. . When the R / W signal from an external device such as a CPU input to the line memory unit 5 is set to "L", the line memory unit 5 enters the write mode, and the color data continuously output from the color image sensor 2 is converted into a digital value. Then, it is stored in the line memory unit 6 as shown in FIG. In this way, the color data output from the color image sensor 2 continuously in the order of R, G, and B are stored in the line memory in the order of R, G, and B. Next, at the time of reading, when the R / W signal from the external device input to the line memory unit 5 is set to “H”, the line memory enters the reading mode, and a read address is given by an external device such as a CPU, and the R is freely set. , G, B color data can be read. As described above, according to the present invention, the image information can be read and stored in the memory with a very simple circuit, and the three primary color information of the image is arranged in the memory for each primary color. Therefore, the reading operation by the reading device can be easily performed, so that the configuration of the reading circuit can be simplified, which is extremely useful in practice.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration of an image information reading / storing device according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing an example of a 1/3 frequency divider, FIG. FIG. 4 is a time chart for explaining an image information recording operation by the image information reading / storing device of the embodiment, FIG. 4 is a memory map diagram of a memory in which image information is written, and FIG. FIG. 6 is a block diagram showing the configuration of the storage device, FIG. 6 is a structural diagram of the color image sensor, and FIG. 7 is a timing chart showing image information output timing from the color image sensor. DESCRIPTION OF SYMBOLS 1 ... Optical lens 2 ... Color image sensor 3 ... Buffer amplifier 4 ... Analog-digital converter 5 ... Line memory part 6 ... Control clock circuit 7 ... 1/3 frequency divider 8 ... n-bit binary counter

Claims (1)

Claims: 1. An image signal converting means for converting a read image signal into a plurality of primary color signals, a control clock means for outputting a scan start signal and a clock signal for starting image reading, and a clock signal from the control clock means. Frequency dividing means for receiving and outputting a first address indicating a registration area in which each of the constituent signals constituting the primary color signal is to be stored;
A second address indicating a registration order in the registration area of a constituent signal constituting the primary color signal based on a clock signal received from the control clock means and an upper address signal of a first address received from the frequency dividing means. And a registration area different from each other for each of the constituent signals of the primary color signal output by the image signal converting means according to the first and second addresses output by the frequency dividing means and the binary counter. And an image signal storage means for storing the image information in the image information reading / storing device.