JPH0362667A - Color picture input device - Google Patents

Abstract

PURPOSE:To attain the input of a high speed color picture with simple structure by forming a scanner in a symmetrical form, applying line main scanning and mechanical sub scanning. CONSTITUTION:A basic clock signal from an oscillator 6 is counted by a counter 7 and the count is used as an address of a ROM 9 to read a sinusoidal value stored in the ROM 9. Then the analog sinusoidal wave is used to drive the same actuator 5 as a voice coil actuator 12 thereby driving an RGB filter 4 straightforward. On the other hand, a CCD drive circuit 8 generates each timing clock from the basic clock to drive a charge coupling element (CCD) 13 and its video signal is fed to a changeover device 16 via an A/D converter 15. The changeover switch 16 stores signals corresponding to each of color filters 4 to R, G, B memories 17, 18, 19 respectively. Thus, the changeover of the filters is synchronized with the scanning of the CCD sensor and the input of high speed color picture is attained with simple structure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Fields] The present invention relates to an image input device for inputting color images to a computer, etc. More specifically, a voice coil type This invention relates to a color image input device that inputs signals separated into each color by switching with an actuator.

[Prior Art] A conventional color image input device uses a beam spooler prism, and each of the separated lights is passed through a filter, separated by a plurality of sensors, and inputted. In addition, there were devices that switched filters for each scan and scanned multiple times to obtain a signal.

[Problems to be Solved by the Invention] Among the conventional color image input methods described above, in the former method, mutual mechanical positioning of each element is complicated and precision is required. The latter requires multiple scans, which is time consuming and requires repeatability.

[Means for Solving the Problems] The present invention has been made in view of the above-mentioned conventional problems.
a lens that forms an image of a subject; an image sensor that converts the image of the subject formed by the lens into an electrical signal; a plurality of filters disposed between the lens and the image sensor; This paper proposes a color image input device having a voice coil type actuator that opens and sequentially switches filters.

[Function] In the present invention, a line sensor is used instead of an area sensor used in a TV camera or the like, and main scanning is performed by a COD line and sub-scanning is performed by mechanical scanning with the scanner as a symmetry.

[Example] Hereinafter, an example of the present invention will be described with reference to the accompanying drawings. Figure 1 is an imaging unit, Figure 2 is an electrical block diagram,
FIG. 3 is an opening waveform diagram, and FIG. 4 is a part of the filter.

The imaging unit (camera) shown in FIG. 1 forms an image of a subject 3 onto a CCD sensor 2 through a lens. CCD
In front of the sensor 2 is an RGB filter 4 divided into three parts.
is movably provided, and this RGB filter 4 is driven by a voice coil type actuator 5 in a direction perpendicular to the sensor line, and the moving distance is set according to the applied signal. Normally, a sine wave signal is used as a power source for the voice coil type actuator 5 in terms of ease of control and vibration.

FIG. 3 shows an opening waveform diagram in which the applied voltage is a sine wave. The voice coil type actuator 5 turbulently moves the RGB filter 4 according to the applied sine wave, and separates the light entering the CCD sensor 2 into each color. In this case, a phase shift may occur between the applied voltage and the amount of mechanical movement depending on the driving frequency, but this can be easily corrected since the amplitude and load are constant at a constant frequency.

Next, the operation will be explained with reference to the electrical block diagram shown in FIG. A signal from an oscillator 6 that oscillates a basic clock is applied to a counter 7 and a CCDCD rotation circuit 8. The counter 7 counts the clock and applies the counted value to the ROM 9 as an address of the ROM 9. A digitized sine wave value is written in the ROM 9, and a value corresponding to the address value of the counter is applied to the DA converter 10. The DA converter 10 converts the value into analog to obtain a sine wave. The power amplifier 11 amplifies the sine wave obtained by the DA converter 10 enough to drive the actuator 12, and operates the actuator 12. Note that this actuator 12 and the voice coil type actuator 5 are the same.

Other clocks applied from the oscillator 6 to the CCDI operating circuit 8 generate timing clocks for operating the CCD 13 and drive the CCD 13. At this time C
The time for one scan of CD13 is as shown in Figure 3.
In the case of 1/2N of the sine wave described above and three colors, it is assumed that one layer has six cycles or less. The video signal from the CCD 13 is amplified through a video amplifier 14, and then sent to a comparator in the case of binarization and an AD converter 15 in the case of multi-value.
is applied to

The signal added digitally by this AD converter 15 is transferred to the switch 1
6. This switch 16 is connected to each memory 17, 18, . . . corresponding to the filter color known from the value of the counter 7.
The distribution of data to 19 is memorized. The interface 20 connects the memories 17 and 1 in response to requests from a CPU (not shown).
8.19 data is transferred.

Here, the voice coil type actuator 5 is driven by the sine wave amplified by the power amplifier 11, and the RGB filter 4 is driven in a straight line. As shown in FIG. 4, the RGB filter 4 has filters corresponding to each color arranged in three layers. The relationship between the linear frame movement of the RGB filter 4 and each color in the opening movement waveform diagram in FIG. 3 is read from the ROM 9, and the RG
The signals corresponding to each color filter of the B filter 4 are stored in the R memory 17. The data is stored in the G memory 18 and the B memory 19 at the timing of the switch 16.

[Effects of the Invention] Since the present invention is constructed as described above, the filter switching can be synchronized with the scanning of the CCD sensor,
It has a simple structure and can input color images at high speed.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which FIG. 1 shows an imaging unit, FIG. 2 shows an electrical block diagram, FIG. 3 shows a driving waveform diagram, and FIG. 4 shows a portion of a filter. 1...Lens, 2...CCD sensor 3...Subject, 4...RGB filter 5...Voice coil type actuator 17
．． 18.19・・・Memory

Claims (3)

[Claims] (1) a lens that forms an image of a subject; an image sensor that converts the image of the subject formed by the lens into an electrical signal; and a plurality of filters disposed between the lens and the image sensor; A color image input device comprising a voice coil type actuator that drives the plurality of filters and sequentially switches them. (2) A ROM in which the voice coil actuator holds a sine wave value whose address is specified by the value of a counter that counts the drive clock of the image sensor, and a DA conversion that converts the corresponding value in the ROM to an analog value. 2. The color image input device according to claim 1, wherein the color image input device is driven by a sine wave generated from a device. (3) The color image input device according to claim 2, wherein when the number of filters is N, the image conversion time of the image sensor is 1/2N or less of the period of the sine wave.