JP2012065310A5 - - Google Patents

Description

In Figure 1, the read vertical transfer driving unit 6 (V-TG), 9 is a CCD image sensor 18 such as IT-CCD with EM-CCD, 9 and 1 8 of the light incident from the optical system 2 Convert to electrical signal. 12 is a AFE (Analog Front End), the conversion and the CDS for removing noise from a signal output from the EM-CCD or CCD image sensor, an AGC for adjusting the gain of the dark current correction signal, the digital video signal Vi and ADC to a horizontal synchronizing generator (Timing-generator: TG) Ru Tona. However, a configuration in which AGC and TG are not included in the AFE may be used. Further, 15 is a CMG drive unit , 16 is a cooling unit , 17 is a cooling drive unit, 19 is a horizontal transfer drive unit (H-TG), and 20 is a CDS with reset. Further, 7 is a temperature sensor, M9 is a dark current screen memory, and 8 is a D / A. Based on the CCD temperature detected by the temperature sensor 7, a dark current correction value for all pixels is generated from the dark current screen memory M9. The dark current is corrected in the reset CDS 20 via the D / A 8. Also at the time of pixel addition, the dark current of all the pixels is corrected by the CDS 20 with reset based on the temperature of the CCD, and then the pixels are added.
In FIG. 1, 5 is a video signal processing unit including an odd pixel addition color separation unit and the multi-pixel contour correcting unit, performs various image processing on the signal output from the AFE 12, NTSC (National-Television- System-Committee) or PAL (Phase-Alternating-by-Line) composite video signal (Video-Burst-Sync) (VBS) or SDI (Serial-Digital-Interface) video signal, or HDTV SDI (HD-SDI) ) outputs the converted video signal of a predetermined method such as. When the dark current is not corrected by the reset CDS 20, the video signal processing unit 5 generates a dark current correction value for all the pixels based on the CCD temperature detected by the temperature sensor 7, and calculates the AGC amount in the AFE 12. After the correction, a correction equivalent to adding the pixels after correcting the dark current of all the pixels is performed by correcting the video signal after adding the dark current correction value corresponding to the pixel addition.

In FIG. 2A of the block diagram showing the color separation unit corresponding to the odd pixel addition of the video signal processing unit of this example , and in FIG. 3A of the schematic diagram showing the horizontal three pixel addition operation of this example , N and m are 0 or more. integers and then, N +1 is the horizontal position in the scan line of the m-3 and m-2 to be vertically added, N +2, the signal charges of the pixels of the N +3 horizontally three-pixel addition, m-1 to be vertically added and N +2 in scanning lines m, N +3, the signal charges of the pixels of the N +4 horizontally three-pixel addition, m + 1 and m + a second scan line N +3 is vertical addition, N +4, the signal charges of the pixels of the N +5 Are added by three horizontal pixels.
H-TG may be one of non-addition normal horizontal transfer drives, and signal charges of three horizontal pixels may be added by thinning out reset pulses with a high-speed logic IC.

2B is Ru Oh block diagram of a multi-pixel edge corrector 26 of an embodiment of the present invention. 27 video level determiner, 28-pixel delay 22 months unit, 51 to 58 adders, 59 is small amplitude large amplitude compression limiter, 60 multiplier for varying the polarity and the amplification degree, 29 and 30 outline Signal generators M1 to M6 are line memory units, N0 to N6 are negative multipliers, and P3 is a positive multiplier.
Before correction signal comprises a line memory unit M1~M7 scanning line (H) and time delay 0H and signal total 7H of 6H. 3H signals will be more pixel time pixel delay 22 months 28 That CCD clock time delay and a total of 23 sets of delayed signal. A total of 7H signals and a total of 23 sets of delayed signals enter the contour signal generation units 29 and 30 , respectively , to become a vertical contour signal and a horizontal contour signal, which are added by the adder 57, and the small amplitude large amplitude compression limiting unit 5 9, the small amplitude and the large amplitude are compression-limited, and a contour correction signal is generated by the positive / negative multiplier 60 under the control of the video level determination unit 27 to which the 3H11 pixel delay signal is input. It becomes. Pixel delay in the horizontal three-pixel addition of al picture element delay 22 months 28 may at 10 months or more, well 5 pixel addition of al minimum 16 or more, or 7 or pixel addition of et 2 2 months or more. As the 3H11 pixel delay signal, a signal at the center of the delay may be selected.

As a result, even if the degree of modulation of low frequency such pre-correction signal a low modulation degree from Figure 3D of (a) low-frequency is an operational view of a multi-pixel edge corrector 26 of the present embodiment is reduced, (b ) contour correction 7 pixel components, (c) contour correction 5 pixel components, or (d) by combining signals such as contour correction 3 pixel components, (e) as in the present invention the corrected signal, contour correction it can.

Claims (7)

In an imaging method using one solid-state imaging device having an on-chip color filter and alternately arranging a first scanning line composed of a cyan pixel and a yellow pixel and a second scanning line composed of a magenta pixel and a green pixel ,
Add odd number of horizontal pixel signal charges of 3 or more, change the combination of horizontal pixel signal charges in the order of one or more scanning lines in the positive order, and add the left and right pixel signals after analog-digital conversion Calculate the pseudo luminance signal, calculate the pseudo color difference signal by diagonally subtracting up and down in the positive order direction of the pixel signal,
Interpolating the high frequency component of the pseudo luminance signal with the high frequency component of the pseudo luminance signal of the upper and lower scanning lines;
Calculating a luminance signal and a color difference signal by calculating the pseudo luminance signal and the pseudo color difference signal, and interpolating a high frequency component of the luminance signal with a high frequency component of the luminance signal of the upper and lower scanning lines; An imaging method characterized by performing at least one. In the imaging method according to claim 1, creates a vertical contour correction signal from the video signal of the number of scanning lines plus three or more of the number of pixels to be added horizontal pixel signal charges, three or more the number of pixels to be added horizontal pixel signal charges An imaging method comprising: generating a horizontal contour correction signal from the added number of pixel delayed video signals, and adding the vertical contour signal and the horizontal contour signal to the video signal. 3. The imaging method according to claim 2, wherein a CDS with reset, an AFE of 12 bits or more, and a digital gain-up means are used, and the odd-numbered horizontal pixel signal charges of 3 or more from the solid-state imaging device are added by the CDS with reset. And an AGC amplification in the AFE and a digital gain increase by a digital gain increase means are combined. In the imaging method according to claim 3, an imaging method, wherein that you are integrating and average value of the signal charge of the output of the solid-state imaging device, and a phase advance of the upper cut set with CDS of CDS reset pulse phase. 5. The imaging method according to claim 1, wherein the pseudo luminance signal is 2Y + G, and the pseudo difference signal is Y + GR. The solid-state imaging device is configured so that the colors of the adjacent pixels of the second scanning line are always different between the upper side and the lower side of the cyan pixel of the first scanning line, or the upper side and the lower side of the yellow pixel of the first scanning line. The pixels are arranged so that the colors of the pixels of the second scanning line adjacent on the side are always different,
The addition of the odd number of horizontal pixel signal charges of 3 or more is performed for the first scanning line and the second scanning line together, and a pixel signal obtained by adding two vertical pixels is the target of the analog-digital conversion. The imaging method according to claim 1. In a color solid-state imaging device having an on-chip color filter and using one IT-CCD imaging device in which scanning lines consisting of cyan and yellow pixels and scanning lines consisting of magenta and green pixels are alternately arranged ,
Correlated Double Sampling-hold (CDS) having a clamp function, a sample hold (set) function, and a reset function, and an odd horizontal number of 3 or more. Means for adding a pixel charge signal; means for analog-to-digital conversion; means for delaying the digitally converted signal in a horizontal period; means for delaying the digitally converted signal in units of pixels; and Means for adding, and means for subtracting the digitally converted signal;
Add three or more consecutive horizontal pixel signal charges of 3 or more consecutive in the CDS,
After you Keru analog-digital converter to means for converting said analog-to-digital, using said horizontal period delay to means and said means for means and said subtraction to said adder and means for delaying a pixel unit, and the digital conversion pixel A color solid-state imaging device characterized in that a pseudo luminance signal is calculated by left-right addition of signals, and a pseudo color difference signal is calculated by a diagonal subtraction of positive and negative with the order direction of the digitally converted pixel signals.