JPH02136845A - Picture reader - Google Patents

Abstract

PURPOSE:To improve picture sharpness by shifting an automatic focus reference range displayed on a transmissive original, judging whether the detected picture sharpness is above a prescribed value or not, and notifying the effect if the picture sharpness is below the prescribed value. CONSTITUTION:This reader is provided with a displaying means 3014 which displays the automatic focus reference range on the displayed transmissive original 3007, a shifting means 3049 which shifts the displayed automatic focus reference range, plural detecting means 3022 to 3024 which detect the picture sharpness in the shifted automatic focus reference range, and a judging means 3039 which judges whether the detected sharpness is above the prescribed value or not. When the judgement indicates that the picture sharpness is below the prescribed value, a notifying means 3042 notifies the effect. Thereby, the picture sharpness is improved when an object is well focused.

Description

[Detailed description of the invention]

Ru. FIG. 1 shows a first embodiment of the invention. In the figure, 3001 is a halogen lamp as a light source;
3017 is a holding member that holds the lamp 3001, 300
2 is a heat ray absorption filter, 3003 is an illumination optical system%300
6 is a film holder that holds a transparent original 3007, for example, 35+n+n photographic film. Light from a halogen lamp 3001 is guided to a transparent original 3007 by a heat ray absorption filter 3002 and an illumination optical system 3003. 30
04 is a sub-scanning drive stand that sub-scans the film holder 3006, 3005 is a rotary stand that rotates the film holder 3006, and 3008 is a movable stand that is provided on the optical path of the light that has passed through the transmission thickness 143007 and can be switched to a retracted position or a reflective position. A mirror 3009 is a mirror that bends the light passing through the transparent original 3007 when the movable mirror 3008 is retracted. 30
1O is an imaging lens that guides the reflected light from the mirror 3009 to a three-color separation prism 3021. 3011 is a projection lens, 3012 is a mirror, 301
3 is a mirror that guides the reflected light from the movable mirror 3008 to the screen 3014. Screen 3014
displays a transparent original 3007 as a display means, and also displays an autofocus reference area 3101 on this transparent original.
is displayed. 3015 is the screen 3014
The trimming frame display 3016 attached above is a touch panel attached to the trimming frame display 3015. CCO line sensors 3022, 3023, and 3024 photoelectrically convert the three-color light from the three-color separation prism 3021. Note that the CCD line sensor 3022. Tsu023,3024
The image sharpness of the autofocus reference area is detected based on the output. 3018, 3019.3020
are CCD alignment mechanisms, which adjust the registration of the CCD line sensors 3022, 3023, and 3024 with respect to the three-color separation prism 3021, that is,
There are things that make the cash register work. Reference numeral 3052 is a timing sensor 1 noter, which synchronizes and drives the CCD line sensors 1) 3022, 3023, and 3024. KO025 is an analog circuit, consisting of an amplifier, a D/D converter, a moxibustion device, and a CCD.
The signals from the line sensors 3022 to 3024 are amplified. The amplified signals are then used as a timing generator for the A/D conversion timing clock output from the notator 1052.
It performs synchronized A/D conversion. 3026 is the adjustment signal 4J source and V source, and the Asalog circuit 30
The standard signal for adjustment of No. 25 is generated. Reference numeral 3027 is a dark correction circuit which corrects the signal and the bell from the analog circuit 3025. 3021
Reference numeral 1 denotes a noeding correction circuit that performs shading correction in the horizontal scanning direction. Reference numeral 3029 denotes a pixel deviation compensation circuit which has a FIFO buffer and corrects pixel deviation in the main scanning direction by shifting the writing time of the FIFO buffer. , 3030 is a color conversion circuit that performs color correction of the color separation optical system and converts RG B (;'7 into Y, M, C signals, or Y , I, and Q color signals. , 3031 is a lookup table that logarithmically transforms the luminance linear value 4 from the desol reference Ill, or converts the γ transform of any one color to ``(- The image processing circuit I) includes a minimum value detection circuit 3032, a lookup table 3033, a masking circuit 3034,
It is composed of a JCR circuit 3035, a density conversion circuit 3031, and a variable magnification processing circuit 3037, and is mainly composed of the four colors of <Y, M, C, and the like of a color laser copy machine.

[1] A signal suitable for outputting one image is formed. Minimum value detection circuit 3032, lookup u'-pull 30
3], Masking circuit 3034.1.1 (: R times 1
1!33035, the image forming phase masking and UCR of the printer shown in FIG. The magnification processing circuit 3037 performs a change in the main scanning direction, and the processed Y', M'C', and '
The signal is sent via the interface (17F) 3038.
The image is sent to the printer shown in [, 2; C]. The InnoTurf Ace circle 38 has a data line 305 facing the output device.
4 and the synchronization signal line 3055, for example R5232Cl! It has a communication line 3056 and can communicate with a general computer via the control command communication line 3056. 3043 is a 1-nons aperture control unit, which controls the imaging 1-nons 301.
This is to control the aperture provided at O. 3Q44 is the lens distance ring 11J control section, and is set on the imaging 1/lens 3010 (
It controls the distance ring. Reference numeral 3045 is a mirror drive unit, which switches the mirror 300'' to the reflection position or the retracted position. Reference numeral 63046 is a trimming frame display control unit, which controls the size of the trimming frame of the trimming frame display 3015. .3047 is a touch panel control unit 1, which controls the evening/5th panel 3011i.63on is a rotary table rotation control unit, which controls the rotation angle 3005.
3049 is a sub-scanning control unit as a moving means, which controls the rotation angle of the sub-scanning drive stand 3004.
3050 is a lamp light control circuit, which controls the amount of movement of the halogen lamp 30.
This is to control the light amount of 01. Reference numeral 3051 is a lamp position driving source which drives the holding member 30J7 by automatically or manually operating the operating section 3041 to adjust the position of the halogen lamp 3001 to J1. 31139 initializes the masterpiece when 5 unillustrated switch is turned on in the controller,
Con-do 1- from 03B or 1N/Part 304X
3040 is a peak detection circuit, and 3041 is an operation unit. T. Yes. 3042 is the sixth part of the table for the notification means, and as a result of determining whether the image 1!'f sharpness is greater than or equal to a predetermined value,
1. If there is no such information, it will be indicated. Turn on the power switch shown in the diagram, and then
- LANI J: Name, the initial fls of the division are not done, the inter-
- Waiting for a command from the screen 3038 or the operation unit 3041
Attach 07 to the film holder 300.
7 is illuminated, and the image of the illuminated transmission thickness g43007 is
The movable mirror 3008 and the projection lens 3011 cause the screen 30 to pass through the mirrors 3012 and 3013.
14. Some transparent manuscripts have images in portrait or landscape orientation,
Rotate the image using the interface 3038 or the operation unit 3.
041 instructs the controller 3039 to rotate the image, and the controller 3039 sends a rotation control command to the rotating table rotation control unit 3048 via the bus 3053 to rotate the rotating table 3005. The film holder 3006 is removably attached to the rotary table 3005 and rotates together with the rotary table 3005. When the transparent original is rotated, the image projected onto the screen 3014 is also rotated. To trim the image, the controller 3039 is instructed to trim from the operation unit 3041 or the interface 3038, and the controller 3039 sends a manual command for trimming information to the touch panel IIJ control unit 3047 via the bus 3053, and the manually input trimming information is sent to the controller 3039 via the bus 3053. The trimming frame control information generated based on the trimming information is sent to the trimming frame display control unit 3046 via the bus 3053, and the trimming area is displayed. Next, an image reading procedure by the controller 3039 will be explained. (1) The movable mirror 3008 is rotated and retracted, and an image with a transmission thickness fA3007 is transmitted through the 3P prism 3021 by the mirror 3009 and the I-most image lens 3010.
CD leads onto line sensors 3022-3024. (2) Then, in order to set the dark correction information in the dark correction circuit 3027, the lamp light amount control circuit 3050 is controlled to turn off the halogen lamp 3001, or the sub-scanning control section 3049 is controlled to control the sub-scanning. 30 units
04 to a light shielding device where each CCD line sensor 3022 to 3024 is shielded from light. Next, the dark correction circuit 3027 is controlled, and the CCD line sensors 3022 to 302 are controlled by the analog circuit 3025.
4 is converted into a digital signal, and a dark correction signal of the dark correction circuit 3027 is set up based on the converted signal. (3) After setting up the dark correction signal, the lamp control circuit 3050 is controlled to turn on the lamp, and the dark correction circuit 3027, shading correction circuit 3028, pixel shift correction circuit 3029, color conversion circuit 3030, lookup table 3031 , masking circuit 3034, II
The cR circuit 3035, the density conversion circuit 3036, and the variable magnification processing circuit 3037 are put into a through mode in which input data is output as is. The interface 30 is then scanned from the CCD line sensors 3022 to 3024 while performing sub-scanning at high speed.
The peak detection circuit 3040 detects a peak based on the data manually entered through the lamp light amount control circuit 305 so that the detected peak value approaches a predetermined level.
0 means 300 halogen lamps! control the light intensity of
Alternatively, the aperture of the projection lens 3010 is controlled by the lens aperture control unit 3043, and the CCD line sensor 302
Adjust the exposure amount from 2 to 3024. (4) After adjusting the exposure amount, the subsequent processing circuit is put into the through mode, and the lens focus adjustment unit 3084 is controlled based on the information subjected to dark correction by the dark correction circuit 3027 to adjust the focus. (5) And each CCD line sensor 3022 to 302
The sub-scanning control table 3004 is moved to the exposure position where 4 is exposed by 10 times of illumination light, the lamp light amount is adjusted to an appropriate brightness by the lamp light amount control circuit, and the dark correction circuit 3027
Shading correction data is set in the shading correction circuit 3028 while manually inputting the dark-corrected signal. (6) After setting the shading correction data, set a pixel shift correction amount in the pixel shift correction circuit 3029. In addition, the type of color conversion is selected for the color conversion circuit 3030,
Select the type of lookup table for lookup tables 3031 and 3033, and masking circuit 303
Select the type of masking for step 4. Furthermore, U.C.R.
The presence or absence of IJcR is selected for the circuit 3035, the type of density conversion is selected for the density conversion circuit 3036, and various parameters corresponding to the scaling factor are selected for the scaling processing circuit 3037. Thereafter, the lamp light intensity is controlled by the lamp light intensity control circuit 3050 in the same manner as in (3) to a predetermined light intensity, and then sub-scanning speed trimming information is sent to the sub-scanning control unit 3049, and the transparent original is moved to the sub-scanning start position. and wait. (7) Then, based on the reading start command from the operation unit 3041, a start command is given to an output device such as a printer (not shown) via the interface 3038, and the sub-running is started based on a synchronization signal from the output device. Start. Then,
Images are captured while being synchronized with the output device, and processed image data is output via the interface 3038. Also,
When there is a command to start reading via the interface 3038, based on this command, completion of preparation is reported to a device (not shown) via the interface 3038, and based on a synchronization signal from the output device, sub-scanning is started and output is started. It takes an image while synchronizing with the m device and outputs the processed image data via the interface 3038. FIG. 2 shows a second embodiment of the invention. The same parts as in FIG. 1 are given the same reference numerals. In the figure, 3060 is an image sensor, which is a 3-line line sensor 3.
061, 3062, and 3063, and is output from the timing generator 3052.
5 to 3067 are independently driven. The CCD line sensor 3061 has an on-chip R color separation filter, the CCD line sensor 3062 has an on-chip G color separation filter, and the CCD line sensor 30
63 has an on-chip B color separation filter. 306
4 is a position alignment mechanism, and CCD line sensor 3062~
3064 position alignment. 3065-3
067 are CCD line sensors 3061 to 306, respectively.
This is the No. 3 drive signal. Reference numeral 3059 denotes a delay buffer memory, which is constituted by a FIFO and is used to correct positional deviations of the line sensors 3061 to 3063 in the sub-scanning direction. The delay for each color is set in advance by the controller 3039 according to the sub-scanning speed. 3040 is a peak detection circuit that detects the maximum value of each color (No. 2) output from the shading correction circuit during the period when AE is H (enabled). The value is read by the controller. Figure 3 shows an embodiment of the automatic focus adjustment system. The same parts as in Figure 2 are given the same reference numerals. In the figure, 3044 is the distance ring control unit, and 3069 is the imaging unit. lens 30
Distance ring attached to 1O, 3071 is deceleration mechanism 3070
3073 is an image processing unit, x2 indicates the position of point P' on the film 3007 in the optical axis direction, and x9 indicates the formation of the image (Q') of point P'. Indicates the image position (optical axis direction), and Q” is the controller 303
9, the motor 3071 is connected via the distance ring control unit 3044.
Drive L/, distance control 346 via deceleration mechanism 3070
9 indicates the imaging position of P' when the focal position tube of the imaging lens 3010 is changed. FIG. 4 shows an example of an image reference area for automatic focus adjustment. The positions of the image reference areas shown in FIGS. 4(a) and 4(b) indicate initial positions. 1 rainbow 45, 3100 is an image area of a transparent original, and 3101 is an AF reference area to be referred to when performing automatic focus adjustment. FIG. 4(b) shows an image area when the orientation of the transparent original shown in FIG. 4(a) is rotated by 90 degrees. In this example, the AF reference area is set near the center of the screen so that the autofocus (AF) of a normal camera is performed based on image information near the center of the screen. The degree of focus is detected based on the signal. FIG. 5 shows A when the subject document is trimmed in a trimming area 3120 surrounded by points P and P2 and scanned "C".
The initial position of the F reference area 3101 is shown. The effective image when cropping and imaging is within the rimming area, so if the rimming area 3120 is regarded as the image area 3100, the same control will be achieved, for example, if the transmission thickness 13007 of the device film etc. is ! Even if the image is tilted or off to MQ, it is possible to focus on the required image area. Next, a method of automatic focus adjustment will be explained. In the self-focus adjustment, focus is adjusted based on the sharpness of the bin 1-, and the lens distance l11 is controlled by the ring or the position of the lens in the optical axis direction. An image that is in focus has sharper edges and a higher amount of high-frequency components in the image signal when the image is read than an image that is out of focus. In general, cameras use a method to perform AF by detecting how much the image is in focus (or conversely, whether it is out of focus) from the image signal, such as by using the amount of high-frequency components of the image signal as the target amount. In the field, this is called blur amount detection. Other methods that utilize the principle of triangulation include an active method that projects spot light or patterned light, and a shift detection method that detects the amount of shift in patterns of images captured by multiple sensors. FIG. 7 is a flowchart showing the FIA procedure performed by the controller 3039. In step S51, the F reference area 3101 is moved to the default position, and in step S2, the distance ring 3069 is moved to the default position. Then, in step S3, C
Based on the G imaging code of the F reference area 3101 read out from the CD line sensor 3062, the sharpness P is calculated using equation (1).
Find it from P=Σ (XJ-XJ-1)2
...(1)"! a However, x,: Output level of the j-th pixel in the main scanning direction a, b: Number of the second pixel from the beginning and the last pixel in the main scanning direction of the image reference area for F 3101. Go to step S4 in 8 lines. . In step S4, it is determined whether the sharpness P exceeds the predetermined value of 5, and as a result of the judgment, if the sharpness P exceeds the predetermined value of 5, in step S5,
Based on the sharpness obtained from equation (1), the imaging lens 301
The lens distance ring control unit 3044 drives the zero distance ring 3069 to control the lens aperture amount ΔX and change the focal position. On the other hand, as a result of the determination in step S4, if the sharpness P does not exceed the predetermined value ST, the display unit 3
042 to give a warning. Then, in step S7, the correction area is changed, and in step S8, the sensor is moved.Thereafter, steps S3 and 54 degrees and S6 to S8 are repeated to adjust the focus. FIG. 8 shows another example of the operating section. This operation unit has a liquid crystal touch panel display,
AF area 3] A key 3201 is displayed on the arrow key 3200.0 for moving Ol, and a warning is also displayed. The arrow keys 32oO are touch switches. If the sharpness P does not exceed the predetermined value ST, a warning as shown in FIG. 9(a) is displayed on the operation panel, and at the same time, the AF area is displayed on the screen 3014 as shown in FIG. 9(b). be done. FIG. 9 shows a third embodiment of the invention. In comparison with the first embodiment, this embodiment is different in the operating section and the display section. That is, in the first embodiment, the operation section 3
041 and the display section 3042 are separated, but in this embodiment, the operation section and display section shown in FIG. 8 are integrated and provided at the bottom of the screen. By doing this, the sharpness P
does not exceed the predetermined value s7, the liquid crystal display becomes as shown in FIG. 10, the AF reference area 3101 is displayed on the screen 3041, and a warning that the AF area is inappropriate is displayed on the display. to display the cursor for moving the AF area, and press the arrow keys 320 on the transparent touch panel.
The AF area display is moved by input from 0. Since this is done, the effects of this embodiment are not physically different from those of the first embodiment. FIG. 11 shows a fourth embodiment of the invention. In comparison with the first embodiment, this embodiment has a
1 (11) is different in the movement method. That is, in the first embodiment, the F area 3101 was moved to an arbitrary point, but in this embodiment, it was moved to a plurality of predetermined positions. In this embodiment, if the sharpness P does not exceed the predetermined value S7, the AF error LED 3402 lights up, and the AF area display 3403 (7 segment LED in this case) indicates that the AF
Display the territory number "5". At the same time, a drive command is sent from the controller 3039 to the AF area indicating plate driving section 3400, and the AF area indicating plate 3401 is moved onto the screen 3014 as shown in FIG. At this time, if you manually press the AF area you want to change, for example "8", using the operation key 3405, "8" will be displayed on the AF area display 3403, and by pressing the * key you will be able to change the center to the new AF area, that is, area 8. to start the next AF operation. In addition, at this time, AF error L″F, mouth 34
02 is turned off, the F area indicator plate 3401 is returned to its original position, and the AF area indicator 3403 is also turned off. Like this 11. Therefore, the effects of this example are not different from those of the first fruit 713 in terms of wood quality. [Efficacy of invention! As explained above, according to the invention, the AI/reference area is superimposed on the actual image element, which improves the operability of AF percentage filling and improves the sharpness during just focus. It has the effect of being able to

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an image reading device according to an embodiment of invention box 1, FIG. 2 is a block diagram showing an image reading device according to an embodiment of invention box 2, and FIG. 3 is a block diagram showing an image reading device according to an embodiment of invention box 2. Figure 4 is a diagram showing an example of the image reference area for automatic focus adjustment, Figure 5 is a diagram showing the initial position of the F reference area when the subject document is trimmed, and Figure 6 is a diagram showing an example of the image reference area for automatic focus adjustment. The figure shows an example of the relationship between the lens aperture amount and the sharpness. Figure 7 is a flowchart showing the order of AF processing by the controller 3039. Figure 8 is a diagram showing an example of the relationship between the lens aperture and sharpness. Figure 9 is a block diagram showing an image reading device according to the embodiment of the present invention box 3; Figure io is an example of a screen image when a warning is displayed on the display section and the operation section FIG. 11 shows an image reading device according to an embodiment of the invention box 4, and FIG. 12 shows an AF area indicator 3 moved onto the screen.
401 and the operation keys used to move the AF area and A
It is a figure showing F error LED:1402. 3007... Transmission [q draft, 3014... Screen, 3101... AF area 3022-3024... CCD sensor, 3039...
- Konino Drawer, 3042...Display unit, 3044...Lens distance ring control unit, 3049...Sub-scanning control unit. Figure 3 is 41'' L, nce° all respect seven 1'' ΔX Figure 6 ,．． 3402 AF error-9: AF Zheng f3403 Fig. 12

Claims (1)

[Claims] 1) Display means for displaying a transparent original and an autofocus reference area on the displayed transparent original; moving means for moving the displayed autofocus reference area; a detecting means for detecting image sharpness of the autofocus reference area; a determining means for determining whether or not the detected image sharpness is equal to or greater than a predetermined value; An image reading device characterized by comprising: a notification means for notifying the user.