Image reading apparatus and image processing apparatus

Abstract: To properly cut light except for visible light and improve read precision, there is provided an image reading apparatus having a plurality of photoelectric conversion elements (210-1,2,3,4). The image reading apparatus includes an image information detecting unit in which the photoelectric conversion elements are arranged on a single chip (210-14), a first light-shielding unit (210-8,9,10), arranged near the photoelectric conversion elements, for transmitting specific visible light, and a second light-shielding unit (210-5,11), arranged near the photoelectric conversion elements at a position different from that of the first light-shielding unit, for partially shielding light except for the visible light.

Description: The present invention relates to an image reading apparatus for reading optical information of visible light and light except for the visible light. There has been conventionally the possibility that banknotes, stamps, and securities are counterfeited along with the development of a high-quality color copying machine. Various schemes for recognizing banknotes, such as a method of detecting the seal pattern of a banknote, have been proposed. There is also proposed a scheme for recognizing a banknote or the like from the hue of an original because the pattern of the original is expressed with a specific hue. There is further proposed a scheme for printing a specific mark on a banknote with a fluorescent ink for emitting invisible light upon radiation of an ultraviolet ray on the banknote, thereby discriminating an authentic banknote from a counterfeit banknote. There is further proposed a scheme for detecting an infrared absorption characteristic ink used in securities to judge authentic securities. There is provided an apparatus for detecting the infrared ray, wherein a read sensor for forming a normal color image and a read sensor for detecting an infrared ray are monolithically arranged to use a common optical system, thereby achieving compactness and facilitating optical adjustment. When the infrared information read sensor and the visible color information read sensor are monolithically arranged on a single chip, color separation filters arranged on the visible color information read sensor must also have a function of cutting off unnecessary infrared information. In this arrangement, a dyed gelatin materials or pigment-dispersed materials are used for the color separation filters constituting the sensor surface. When these pigments or dyes are used to arrange R, G, and B filters having infrared absorption properties, color turbidity occurs in the R, G, and B color separation characteristics upon detection of visible light, and the R, G, and B color separation characteristics are degraded. In addition, when the infrared information read sensor and the visible color read sensor are monolithically arranged on a single chip, for example, a sensor assembly becomes bulky depending on the layout of sensors, and an arrangement for correcting shifts between the read positions of the sensors becomes bulky. US 4663656 discloses a semiconductor imager comprising an area-array CCD for detecting visible and near IR infrared wavelengths. Photosensing sites are arranged by row and by column, and successive rows are illuminated by replications of the same line segment, as transmitted by respective color filter stripes. The charge packets are read out row by row. According to the present invention, there is provided an image reading apparatus as set out in claim 1. The present invention also provides the combination of an image forming apparatus and an image reading apparatus as set out in claim 12. The present invention further provides a copying apparatus including a reading apparatus as set out in claim 13. Fig. 1 is a view showing the structure of a CCD in the first embodiment; Fig. 2 is a view showing a color copying machine using the present invention; Fig. 3 is a view showing a specific original identification pattern in the first embodiment; Fig. 4 is a block diagram of a two-dimensional area signal generation unit for detecting a specific pattern in the first embodiment; Fig. 5 is a view showing reference pixels for detecting the specific pattern in the first embodiment; Fig. 6 is a diagram of a specific pattern judging unit of the first embodiment; Figs. 7A and 7B are views showing the structure of the CCD of the first embodiment; Fig. 8 is a graph showing the spectral reflectivity of a standard white board; Fig. 9 is a graph showing the spectral transmittance of the specific pattern; Fig. 10 is a graph showing the spectral sensitivity characteristics of a visible light line sensor and the characteristics of a filter for an infrared read sensor; Fig. 11 is a graph showing the characteristics of an infrared cut dichroic filter; Fig. 12 is a graph showing the characteristics of a far-infrared cut filter; Fig. 13 is a view showing the mounted state of an infrared cut glass with respect to a CCD sensor; Fig. 14 is a view showing the mounted state of a cover glass when an infrared cut filter is formed on the cover glass of the CCD; Fig. 15 is a block diagram of an image signal control unit; Fig. 16 is a timing chart of image control signals; and Fig. 17 is a flow chart showing CPU control. The present invention will be described with reference to a preferred embodiment hereinafter. The following embodiment will exemplify a copying machine as an application of the present invention. However, the present invention is not limited to this. The present invention is also applicable to various apparatuses such as an image scanner. Fig. 2 is a view showing the apparatus according to the first embodiment of the present invention. Referring to Fig. 2, an image scanner unit 201 reads an original and performs digital signal processing. A printer unit 200 prints and outputs, on a paper sheet, a full-color image corresponding to the original image read by the image scanner unit 201. In the image scanner unit 201, an original press plate 202 is used to fix an original 204 on an original table glass (to be referred to as a platen hereinafter) 203. The original 204 is irradiated with light from a halogen lamp 205. Light reflected by the original 204 is guided to mirrors 206 and 207 and is focused through the lens 208 to form an image on a 4-line sensor (to be referred to as a CCD hereinafter) 210 constituted by four CCD line sensors. The CCD 210 color-separates optical information from the original and sends red (R), green (G), blue (B), and infrared information (IR) components of the full-color information to a signal processing unit 209. The halogen lamp 205 and the mirror 206 are mechanically moved in a direction (to be referred to as a subscanning direction hereinafter) perpendicular to an electrical scanning direction (to be referred to as a main scanning direction hereinafter) of the line sensors at a speed v, and the mirror 207 is moved in the same direction as that of the halogen lamps 205 and the mirror 206 at a speed v/2, thereby scanning the entire surface of the original. A standard white board 211 is used to generate data for correcting read data respectively corresponding to sensors 210-1 to 210-4 as IR, R, G, and B component line sensors in shading correction. This standard white board has almost uniform reflectivity characteristics for light ranging from visible light to the infrared rays, as shown in Fig. 8 and is visually observed in white. This standard white board is used to correct output data from the IR sensor 210-1 for the infrared ray and output data from the visible light sensors 210-2 to 210-4 for the R, G, and B components. The signal processing unit 209 electrically processes the read signal and color-separates it into magenta (M), cyan (C), yellow (Y), and black (BK) components. These components are then sent to the printer unit 200. One of the M, C, Y, and BK components is surface-sequentially sent to the printer unit 200 in accordance with one original scanning cycle of the image scanner unit 201. A color image is formed by a total of four original scanning cycles. The M, C, Y, and BK image signals sent from the image scanner unit 201 are sent to a laser driver 212. The laser driver 213 modulates and drives a semiconductor laser 213 in accordance with image signals. A laser beam scans the surface of a photosensitive drum 217 through a polygon mirror 214, an f- lens 215, and a mirror 216. Developing units 219 to 222 comprise the magenta developing unit 219, the cyan developing unit 220, the yellow developing unit 221, and the black developing unit 222. The four developing units are sequentially brought into contact with the photosensitive drum to develop the M, C, Y, and BK latent images formed on the photosensitive drum 217 with the corresponding toners. A transfer drum 223 winds a paper sheet fed from a paper cassette 224 or 225 on a transfer drum 223 and transfers the toner images from the photosensitive drum 217 to the paper sheet. The M, C, Y, and BK color images are sequentially transferred onto the paper sheet, and the paper is fixed by a fixing unit 226. The fixed sheet is then discharged outside the apparatus. The halogen lamp 205 is used to read visible light information and infrared information. The halogen lamp 205 has illumination wavelength components required for reading these pieces of optical information. In this manner, the common illumination system is used to effectively illuminate the original with illumination light components having different wavelength components for reading the visible and infrared components. Fig. 7A shows the structure of the CCD 210 used in this embodiment. The IR line sensor 210-1 comprises a light-receiving element array for reading an infrared ray (IR), and the R, G, and B line sensors 210-2, 210-3, and 210-4 comprise light-receiving element arrays for reading the R, G, and B wavelength components, respectively. Each of the IR, R, G, and B sensors 210-1 to 21-4 has an opening having a size of 10 µm in both the main scanning and subscanning directions. The four light-receiving element arrays having different optical characteristics are monolithically and parallelly formed on a single silicon chip so that the IR, R, G, and B sensors can read the same line. When the CCD having the above arrangement is used, a common optical system such as a lens can be used to read the visible light and the infrared ray. With the above structure, precision as in optical adjustment can be improved, and the adjustment can be facilitated. A glass plate 210-5 has infrared cut characteristics in its hatched portion and has a thickness of about 300 µm. The infrared cut characteristics of the hatched portion are obtained by a dichroic mirror 210-11 formed by a deposition film 210-11. The infrared cut characteristics are shown in Fig. 11. In this case, the glass plate is adhered to the chip surface such that the deposition surface faces the sensor side. Fig. 7B is an enlarged view of the light-receiving elements. Each sensor has a length of 10 µm per pixel in the main scanning direction. Each sensor has 500 pixels in the main scanning direction so that an image of an A3-size original is read at a resolution of 400 dpi (dots per inch) in the widthwise direction (297 mm). An interval between the R, G, and B line sensors is 80 µm, and these sensors are spaced apart from each other by eight lines with respect to a subscanning resolution of 400 dpi. The interval or distance between the IR sensor 210-1 and the R sensor 210-2 is twice (160 µm or 16 lines) that between the remaining sensors. In this manner, when the interval between the IR sensor 210-1 and the R sensor 210-2 is larger than that between the remaining sensors, the mounting precision of the glass plate 210-5 with respect to the sensor chip surface need not be strict when the deposition surface of the deposition film 210-11 of the glass plate 210-5 is caused to correspond to the sensors 210-2 to 210-4, and the non-deposition surface is caused to correspond to the sensor 210-1. Fig. 1 is a cross-sectional view of the sensors used in this embodiment. The line sensors 210-1 to 210-4 are monolithically formed on a common silicon chip 210-14, and optical filters 210-6 to 210-10 for obtaining predetermined IR, R, G, and B spectral characteristics are formed on the surfaces of the corresponding line sensors. The pigment filters 210-8, 210-9, and 210-10 transmit R, G, and B wavelength components therethrough, so that R, G, and B read signals are obtained from the sensors 210-2, 210-3, and 210-4, respectively. The R filter 210-6 having the same optical characteristics as those of the R filter 210-8 and the B filter 210-7 having the same optical characteristics as those of the B filter 210-10 are stacked on the IR sensor 210-1. Only an IR ray having a wavelength of 750 nm or more can be read by the combination of the R and B filter characteristics. The glass plate 210-5 is mounted near the surface of the sensor, and the deposition film 210-11 for shielding the infrared ray faces the sensor side because light incident on the sensor is focused by the lens 209, as shown in Fig. 13 and beams incident on the sensors are superposed on each other at a position away from the sensor surface. That is, when the infrared cut filter (the deposition film) 210-11 is operated for only light components incident on the sensors 210-2 to 210-4, the infrared cut filter 210-11 must be mounted at a portion near the sensor where the IR ray is not superposed on the R component. Since the infrared cut filter 210-11 is located near the surface of the sensor, the IR beam is not shielded by the IR filter, so that an allowable mounting width a for forming the deposition film can be increased. When the glass plate 210-13 is to be mounted on the sensor chip with the IR cut filter 210-11 being adhered to the glass plate 210-13, the mounting precision of the glass plate 210-13 with respect to the sensor chip need not be strict. When the infrared cut filter is mounted on the surface of the glass plate 210-5 on the side opposite to the sensor, the IR beam is superposed on the R beam. For this reason, when the infrared cut filter is arranged with a sufficient margin with respect to the R beam, most of the IR beam focused on the IR sensor 210-1 is shielded to undesirably lower the IR signal level. The infrared cut filter 210-11 may be formed on the surface of a cover glass 210-13 on the sensor side in place of mounting the glass plate 210-5 as shown in Fig. 14. In this case, a ceramic package 210-12 of the CCD sensor is arranged so that a distance d between the sensor surface and the inner surface of the glass cover is sufficiently small, thereby almost preventing the infrared cut filter 210-11 formed on the inner surface of the cover glass from shielding the IR beam. The spectral characteristics of the filters of the IR, R, G, and B line sensors of the CCD 210 will be described with reference to Fig. 10. A characteristic curve R represents the characteristics of outputs from the sensors using the filters 210-8 and 210-6. The characteristic curve R represents sensitivities for light in the red and infrared wavelength ranges. A characteristic curve G represents the characteristics of an output from the sensor using the filter 210-9. The characteristic curve G represents sensitivities for light in the green and infrared wavelength ranges. A characteristic curve B represents the characteristics of sensors using the characteristic filter 210-10 and the filter 210-7. The characteristic curve B represents sensitivities for light in the blue and infrared wavelength ranges. Since the filters 210-6 and 210-7 are stacked on the IR sensor 210-1, this sensor has a sensitivity for light in the infrared range indicated by a hatched portion in Fig. 10. As can be apparent from Fig. 10, the R, G, and B filters 210-8 to 210-10 have sensitivities for infrared rays having wavelengths of 700 nm or more. For this reason, the infrared cut filter 210-11 has the characteristics shown in Fig. 11. The spectral absorptivity of an infrared absorber SIR-159 available from Mitsui Toatsu Chemicals, Inc. used for a detection mark of a specific original in this embodiment is shown in Fig. 9. In this embodiment, to cause the IR sensor to detect the presence/absence of this infrared absorber, the IR sensor detects only infrared rays in the wavelength range of 750 nm to 850 nm. For this purpose, a far-infrared cut filter constituted by a dichroic mirror shown in Fig. 12 is provided to the lens 209. This filter does not adversely affect not only the IR sensor 210-1 but also the R, G, and B sensors 210-2 to 210-4 and is arranged in a lens portion common to the visible and infrared components. With this arrangement, a filter mounted on the lens 209 can be used only in consideration of infrared cut characteristics. Therefore, good far-infrared cut characteristics can be realized with a simple interference film. Fig. 15 is a block diagram showing the flow of an image signal in the image scanner unit 201. An image signal output from the CCD 210 is input to an analog signal processing unit 3001, so that the gain and offset of the image signal are adjusted therein. An output from the analog signal processing unit 3001 is input to A/D converters 3002 to 3005, so that the image signal is converted into 8-bit digital image signals of the respective color components. These signals are then input to shading correction units 3006 to 3009, so that known shading correction using a read signal from the standard white board 211 is performed for each color component. A clock generation unit 3019 generates a clock per pixel. A line counter 3020 counts clocks and generates a pixel address output per line. A decoder 3021 decodes a main scanning address from a main scanning address counter 3020 to generate a CCD drive signal per line such as a shift pulse and a reset pulse, a VE signal representing the valid area in a one-line read signal from the CCD, and a line sync signal HSYNC. The counter 3020 is cleared in response to the HSYNC signal and starts counting the main scanning address of the next line. As shown in Fig. 1, the light-receiving element arrays 210-1, 210-2, 210-3, and 210-4 are spaced apart from each other at the predetermined intervals, spatial shifts in the subscanning direction are corrected in line delay elements 3010, 3011, and 3012. More specifically, the IR, R, and B signals obtained by reading the downstream original information in the subscanning direction with respect to the B signal are delayed by lines in the subscanning direction and are matched with the B signal. Light amount/density conversion units 3013, 3014, and 3015 comprises a look-up table ROM to convert a luminance signal of the R, G, and B components into a density signal of the C, M, and Y components. A known masking/UCR circuit 3016 receives the three primary (Y, M, and C) signals and outputs Y, M, C, and BK 8-bit signals sequentially every time the read cycle is repeated, and a detailed description thereof will be omitted. An identifying unit 3 detects a specific pattern in an original. A CPU 3018 performs sequence control such as control of an original reading optical system and ON/OFF control of the original illumination lamp or halogen lamp 205, and generates a pixel interval signal VSYNC in the subscanning direction. The CPU 3018 also controls a selector 3017 in accordance with the identification result from the identifying unit 3 and outputs a port output in place of the read signal, thereby inhibiting the copy operation of a specific original. Fig. 16 shows the timings of all control signals. The VSYNC signal is an image valid interval signal in the subscanning direction. When the VSYNC signal is set at "1", an image is read (scanned) to sequentially form output signals of (M), (C), (Y), and (BK). The VE signal is the pixel valid interval signal in the main scanning direction. When the VE signal is set at "1", the timing of the main scanning start position is set. A CLOCK signal is a pixel sync signal. When the CLOCK signal goes to level "1", image data is transferred. An image pattern (identification mark) to be detected in this embodiment will be generally described with reference to Fig. 3. Fig. 3 shows a pattern formed using a transparent ink consisting of a transparent infrared absorption dye having the characteristics shown in Fig. 9. That is, a small square pattern b having one side of 120 µm is printed with the transparent ink on a triangular pattern recorded with an ink a which does not absorb a specific infrared ray. The pattern b is rarely noticeable in the visible range and cannot be identified with the human eye. However, this pattern b can be detected in the infrared range. The square pattern having one side of 120 µm is exemplified for the subsequent descriptive convenience. When the area of the pattern b is read at a resolution of 400 dpi (dots per inch), the area is detected as a size of about four pixels, as indicated in Fig. 4. A method of forming this pattern is not limited to the illustrated one. Better judgment can be performed if a circular or concentric pattern independent of an original direction is formed. The details of the identifying unit 3 in Fig. 15 will be described with reference to Fig. 4. Image data line delay units or line memories 10-1 to 10-4 comprise FIFOs. The address pointers of the line memories 10-1 to 10-4 are initialized by the line sync signal HSYNC. Data write access and data read access to the line memories 10-1 to 10-4 are performed in response to the CLOCK signal in units of pixels. The line memories 10-1 to 10-4 delay 32-bit R, G, B, and IR data by one line each. An input signal is delayed by flip-flops 11-1 and 11-2 by two pixels to generate pixel data A. The input signal is delayed by the line memories 10-1 and 10-2 by two lines to generate pixel data C. The pixel data C is then delayed by two pixels and four pixels to generate target pixel data X and pixel data B, respectively. Similarly, the pixel data D is input to a judging unit 12. The positional relationship between the four pixels of the pixel data A, B, C, and D near the position of the target pixel is shown in Fig. 5. More specifically, if the target pixel X includes the pattern b in Fig. 3, the pixels A, B, C, and D include the pattern a surrounding the pattern b. A judging algorithm of the judging unit 12 used in this embodiment will be described below. R, G, B, and IR components of the read signal constituting the pixel signal A are defined as AR, AG, AB, AIR, and the components of the pixel signals B, C, and D are defined in the same manner as described above. Average values YR, YG, YB, and YIR of the read signals of the R, G, B, and IR components of the respective pixel signals are expressed as follows: Y R = 1 4 ( A R + B R + C R + D R ) Y G = 1 4 ( A G + B G + C G + D G ) Y B = 1 4 ( A B + B B + C B + D B ) Y IR = 1 4 ( A IR + B IR + C IR + D IR ) Judgment of the target pattern is performed in accordance with differences between the average values Y and the target pixel X. More specifically, a pattern is detected when the following equations are established: ΔR = |Y R - X R | ΔG= |Y G - X G | ΔB = |Y B - X B | ΔIR = |Y IR - X IR | where X R , X G , X B , and X IR are the R, G, B, and IR components of the target pixel X. A specific pattern is detected under the following conditions: ΔR < K ΔG < K ΔB < K and (ΔIR > L1 or Y IR /X IR > L2) (K, L1, and L2 are constants) that is, the target pixel X is compared with the neighboring pixels A, B, C, and D. If a color tone different is small (K is small) and a difference of the constant L1 or more is present in the infrared range, or if a ratio of the neighboring level to the level of the target pixel X in the infrared region is the constant L2 or more, the specific pattern is detected. Judgment of the infrared region is performed on the basis of not only the difference but also the ratio because a decrease in level of the infrared signal due to contamination is taken into consideration. The influence of contamination which attenuates the infrared read signal as a whole is eliminated by detecting the ratio. An arrangement of the judging unit 12 which practices the above algorithm is shown in Fig. 6. Each adder 121 simply adds the 4-pixel color components, and outputs upper eight bits, so that the adders 121-1 to 121-4 output YR, YG, YB, and YIR. Each subtracter 122 obtains a difference between the target pixel signal and a corresponding color component and supplies upper five bits of each of the ΔR, ΔG, and ΔB components to a judging LUT (judging ROM 1) 128. When each 5-bit signal is smaller than the constant K, the judging ROM 128 outputs a signal of level "1". Similarly, as for the infrared read signal, 8-bit YIR and XIR are input to the address terminals of a judging LUT (judging ROM 2) 129 constituted by a ROM. If condition ΔIR > L1 or Y IR /X IR > L2 is established in the calculation ΔIR = Y IR - X IR , the judging ROM 129 outputs a signal of level "1". The outputs from the judging ROMs 128 and 129 are logically ANDed by an AND gate 130. When the AND gate 130 outputs a signal, the specific pattern is detected. The judging result is input to a latch 3022 in Fig. 15. A latch output is input to an input port P10 of the CPU 3018, and the CPU detects that the specific mark has been detected. Prior to the start of the copy sequence, the CPU 3018 clears the latch 3022 in response to a signal from an output port P9 and prepares for detection of the next pattern. The control operation of the CPU in judging an identification mark during a normal copy operation will be described with reference to Fig. 17. When the operator places the original 204 on the platen 203 and starts the copy operation at an operation unit (not shown), the CPU 3018 controls a motor (not shown) and moves the reflecting mirror 206 to a position below the standard white board 211. The halogen lamp 205 is turned on to illuminate the standard white board 211. IR, R, G, and B signal shading data are sampled in the shading correction units 3006 to 3009 (step 1). The port output P9 goes to level "0" to clear the output from the latch 3022 to zero. An output at an output port P8 is cleared to zero. An A input to the selector 3017 is selected to supply a masked/UCR-processed image signal to the printer unit. The output from the output port P9 goes to level "1" to complete the clearing operation of the latch 3022 (step 2). Four original read cycles are performed in synchronism with the image recording operations of the four colors, i.e., M, C, Y, and BK in the printer unit, to perform image recording. At the same time, an identification mark is detected, and the recording operation is controlled in accordance with this detection result. The CPU sets magenta process condition in the masking/UCR processing unit for magenta recording, and the optical system is scanned to supply a magenta signal to the printer unit. Upon completion of scanning, the optical system is returned to the scanning start position (step 3). The CPU fetches an input to the port P10 during original reading to judge whether the input to the port P10 is "1". If so, the CPU judges that a specific original supposed to inhibit normal copying is being copied. An output from ports P0 to P7 is set to "FF"H and an output from the port P8 is set at "1". The CPU outputs a solid black signal of "FF"H to the printer unit, thereby inhibiting the subsequent normal copy operation. Recording control of cyan, yellow, and black is performed in steps 4 to 6 in the same manner as described above, and the CPU periodically checks the state of the port P10. If the output at the port P10 is set at level "1", the solid black signal of "FF"H is output to the printer unit in step 7. If P10 = 1 is detected during cyan recording, the magenta component can be normally copied, but recording with cyan, yellow, and black is performed with the solid black signal of "FF"H. According to the first embodiment, a member having characteristics for shielding light except for visible light is partially arranged near the light-receiving surfaces of the visible light sensor and a sensor for reading light except for the visible light, and the light-shielding portion of the member which shields the light except for the visible light is arranged to correspond to the visible light read sensor. The light except for the visible light can be properly cut with respect to the visible light sensor, and color precision of the read signals from the visible light sensor and the sensor for reading the light except for the visible light, which sensors are formed monolithically, can be improved.

Claims: An image reading apparatus comprising: detecting means (210-1 to 210-4), in which a plurality of adjacent lines of photoelectric conversion elements for visible light (210-2 to 210-4) and a line of photoelectric conversion elements for non-visible light (210-1) are arranged in parallel on one chip (210-14) for simultaneously detecting visible and non-visible light from an image, the photoelectric conversion elements for visible light comprising plural subsets for detecting respective specific colour components of the visible light; and first multi-colour filter means (210-8 to 210-10), arranged on said chip covering the photoelectric conversion elements for visible light, for transmitting each specific colour component of visible light to the respective subset of photoelectric conversion elements; characterised in that: the line of photoelectric conversion elements for non-visible light (210-1) is separated from the nearest line of photoelectric conversion elements for visible light (210-2) by a distance greater than a distance between adjacent lines of photoelectric conversion elements for visible light (210-2 to 210-4); and second filter means (210-11) for filtering out said non-visible light is provided, said second filter means being positioned so that light incident on the photoelectric conversion elements for visible light has to pass through the second filter means thereby preventing said non-visible light reaching the photoelectric conversion elements for visible light, but light incident on said photoelectric conversion elements for non-visible light does not have to pass through the second filter means thereby permitting said non-visible light to reach said photoelectric conversion elements for non-visible light. An apparatus according to claim 1, further comprising third filter means (210-6, 210-7) formed on said chip for preventing said visible light reaching the photoelectric conversion elements for non-visible light. An apparatus according to claim 2, wherein said third filter means comprises a combination of plural colour component filter materials used in the first filter means. An apparatus according to any preceding claim, wherein said distance between said line of photoelectric conversion elements for non-visible light (210-1) and said nearest line of photoelectric conversion elements for visible light (210-2) is an integer multiple of the distance between adjacent lines of photoelectric conversion elements for visible light (210-2 to 210-4). An apparatus according to any preceding claim, further comprising judging means (3) for judging whether said image is indicative of a specific image or not in accordance with the non-visible light detected by said detecting means, and control means (3017, 3018) for controlling image processing in which a signal corresponding to the visible light detected by said detecting means is used, in accordance with the judgment of said judging means. An apparatus according to claim 5, wherein said control means further controls the image processing according to the signal corresponding to said visible light. An apparatus according to claim 5, wherein said control means controls image formation in which the signal corresponding to said visible light is used. An apparatus according to any preceding claim, wherein said non-visible light is infrared light. An apparatus according to any preceding claim, wherein said plurality of colour components are a red component, a blue component and a green component. An apparatus according to any preceding claim, further comprising a common optical system (208) for supplying the visible light and the non-visible light corresponding to the image to said detecting means. An apparatus according to any preceding claim, further comprising illumination means (205) for radiating light on said image for generating the light corresponding to said image. The combination of an image forming apparatus connected to the reading apparatus according to any of claims 1 to 11. A copying apparatus including a reading apparatus according to any of claims 1 to 11.

Inventors: ARIMOTO SHINOBU, HAYASHI TOSHIO, NAGASE TETSUYA, NAKAI TAKEHIKO, SASANUMA NOBUATSU, TANIOKA HIROSHI, UTAGAWA TSUTOMU, YOSHINAGA KAZUO, ARIMOTO, SHINOBU, HAYASHI, TOSHIO, NAGASE, TETSUYA, NAKAI, TAKEHIKO, SASANUMA, NOBUATSU, TANIOKA, HIROSHI, UTAGAWA, TSUTOMU, YOSHINAGA, KAZUO, ARIMOTO, SHINOBU, C/O CANON KABUSHIKI KAISHA, HAYASHI, TOSHIO, C/O CANON KABUSHIKI KAISHA, NAGASE, TETSUYA, C/O CANON KABUSHIKI KAISHA, NAKAI, TAKEHIKO, C/O CANON KABUSHIKI KAISHA, SASANUMA, NOBUATSU, C/O CANON KABUSHIKI KAISHA, TANIOKA, HIROSHI, C/O CANON KABUSHIKI KAISHA, UTAGAWA, TSUTOMU, C/O CANON KABUSHIKI KAISHA, YOSHINAGA, KAZUO, C/O CANON KABUSHIKI KAISHA
Applicants: CANON KK, CANON KABUSHIKI KAISHA
Application year: 1993
Main classification: H04N1
IPC codes: H04N9, H04N3, H04N1, G07D7