JPS60109986A - Solid-state color television image pickup device - Google Patents

Abstract

PURPOSE:To improve the horizontal and vertical resolution by obtaining a required 3-color signal in the unit of two picture elements consecutive to two rows of a solid-state image pickup element. CONSTITUTION:An output signal read sequentially from each row of a picture element group corresponding to a GB row 41 of a color filter 32 and obtained by the image pickup scanning of a solid-state image pickup element 31 read sequentially from each row of the picture element group corresponding to an RG row 42 of the color filter 32 is led to a field delay device 33 and the correlation is taken in the units of consecutive two-picture elements in the horizontal direction by a chrominance signal processing circuit 34 by using the signal before one field and the output signal of the solid-state image pickup element 31. Thus, the chrominance signal having the required three-color component is introduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a solid-state color television imaging device, and particularly to a method for obtaining a required color television (Ii) input signal from the imaging signal output of one solid-state imaging device. The present invention relates to a plate-type solid-state color television imaging device.

[Technical background of the invention]

As a popular solid-state color television imaging device for home use, a single-panel type is used, which has a simple configuration and can be realized at low cost. In this single-chip imaging device, a color filter disposed (for example, by pasting) on the imaging light input surface of the solid-state image sensor (solid-state image sensor) is
Conventionally, a stripe array type as shown in FIG. 1 or a payer array type as shown in FIG. 2 has been used. That is, in the striped array type color filter shown in FIG.
A detection area, a green (G) detection area, and a blue (B) detection area, where R detection area 1 is lined up in the same row as R row and G detection area 2.
A row G in which the detection regions 3 are arranged in the same row and a row B in which the B detection regions 3 are arranged in the same row are arranged repeatedly in order. In imaging scanning of a solid-state image sensor in a color television imaging device using such a striped color filter, output signals from, for example, pixels in odd-numbered rows are read out in the first field, and output signals from the remaining pixels are read out in the second field. Output signals from pixels in even-numbered rows are read out, and one screen is obtained from the output signals of these two fields. In this case, signals of the same color component are read out for every three pixel signals.

However, in the payer array color filter shown in FIG.
Detection area 3 and G detection 41' detection area 2 are aligned alternately? The FBG rows are arranged alternately in two-row units.

In imaging scanning when such a Payer array type color filter is used, the first filter is the first filter.

In reading the second field and the second field, the output signal of the GR row and the output signal of the BG row are obtained alternately.

[Problems with background technology]

However, in the color television imaging device using the striped array type color filter shown in FIG. , had the disadvantage of low horizontal resolution.

Furthermore, in the color television imaging device using the Bayer array color filter shown in FIG. ) in units of 4 pixels every 2 columns (
Since the required three-color signals are obtained using the three-color signal (indicated by a dotted line in FIG. 2), there is a drawback that the vertical resolution is lower than the horizontal resolution. The present invention has been developed in view of the above circumstances, and provides a single-panel solid state color television imaging device capable of obtaining color signals with both high horizontal and vertical resolution.

[Summary of the invention]

That is, the solid-state color television imaging device of the present invention has a single image sensor in which imaging pixels are arranged in a matrix, and signal charges from these pixels are read by repeating a first field scan and a second field scan. a solid-state imaging device, and a first row and a red sensing region provided on the imaging light input surface of the solid-state imaging device, in which green sensing regions and blue sensing regions are arranged alternately in the row direction corresponding to each pixel. and a color filter in which green detection areas are arranged alternately in the row direction and a second row repeats alternately in the column direction; 1, a field delay for guiding the output signal of the solid-state image sensor and delaying it by one field scanning period; a color signal processing circuit that performs correlation processing between the output signal of the solid-state image sensor and the output signal of the field delay device to derive required three color signals in units of two consecutive pixels in the row direction of the solid-state image sensor; It is characterized by comprising the following.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 3, 31 is a solid-state image sensor, 32 is a color filter, and 33 is an imaging scan (first image sensor) of the solid-state image sensor 3.
A field delay device 34 connects the output signal of the solid-state image pickup device 31 and the field delay device to delay the output signal by one field period. As will be described later, the correlation between the signal output from the device 33 and the previous field is calculated in units of two consecutive pixels in the horizontal direction.
This is a color signal processing circuit that obtains color signals of required three color components.

The color filter 32 is disposed on the imaging light input surface of the solid-state imaging device 31, and a portion thereof is shown in FIG. That is, green (9) detection area 2 or blue (9) detection areas 2 or blue (
B) Detection region 3 or red (R) detection region 1 is formed. In this case, G detection area 2 and B
GBBi 12 in which detection areas 3 are arranged alternately, 1'LG rows 42 in which R detection areas 1 and G detection areas 2 are arranged in alternation, etc. are arranged in an alternating manner, and if you look at this arrangement in the column direction, G detection area 2 and R detection area 1 are arranged alternately
The R row and the R0 row in which the B detection area 3 and the G detection area 2 are alternately arranged are repeated alternately.

In addition, in order to express the relative positional relationship of the detection areas of each color of the color filter 3 years old in an easy-to-understand manner, the number in the row direction of the matrix arrangement is expressed as Xl (i = 1.2 - . . . m)
, the number in the column direction is yj (j=1.2...n), and the position of each detection area is expressed as (xjv yj).

In the color television imaging device having the above configuration, it is assumed that the output signal of the first field scan of the solid-state image sensor 31 is sequentially read out from each row of the pixel group corresponding to, for example, the GB row 41 of the color filter 32,
It is assumed that the output signal of the 27th yield scan is sequentially read out from each row of the pixel group corresponding to the RG row 42 of the color filter 32. Now, when the signal from the pixel corresponding to the G11 detection area 2 at the (7N # yl) position of the color filter 32 is being read out from the solid-state image sensor 31 in the first field scanning, the field delay device 33 reads out the A signal read out from the pixel corresponding to the R21 detection area 1 at the (X2 y yl) position of the color filter 32 in the second field scan before the field is output. Next, (xl *
yl) When the signal from the pixel corresponding to the B12 detection area 3 at the position is being read out, the field delay device R
1 field before color filter 33 (X2
#72) Image corresponding to G22 detection area 2 at position
The signal read from the element is output. Then, the color signal processing circuit 34 processes the color fill 32 ((
Xl w yl ) + (X2 y )'i ,)
e (Xl r 3'2) + (x2 m 72)
Correlation is established between read signals from pixels adjacent in the row and column directions corresponding to each detection area of the position. As a result, three color components are derived as color signals of two pixels corresponding to the (xltyl) (xl + yl) position, and in this way, three color components are derived as color signals of two pixels each in the first field scan. be led out. Also, in the second field scan, three color components are derived as color signals for each two pixels in the same manner as in the first field scan. In this case, when a signal from a pixel corresponding to, for example, row number x2 of the color filter 32 is being read out in the second field scan, the field delay device M33 outputs a signal from the pixel of the color filter 32 in the first field scan one field before. The signal from the pixel corresponding to row number x3 is read out.

According to the above-mentioned color television imaging device, the required three-color signals are obtained in units of two consecutive pixels in the row direction of two consecutive rows (one row in each field) of the solid-state image sensor. , high resolution both horizontally and vertically. In other words,
Compared to the case of using the striped array type color filter shown in Figure 1 mentioned above, the vertical resolution is improved, and the horizontal resolution is improved in comparison to the case of using the payer array type color filter of Figure 2 mentioned above. The vertical resolution has been improved while the horizontal resolution remains the same.

Note that, as the field delay device 33, for example, a fifth
As shown in the figure, a CCD analog memory using a charge-coupled device (COD) type charge transfer section can be used. That is, 5 is an input circuit, and the output signal 75 of the solid-state image sensor 31! It is led from the input terminal 5θ and performs voltage/charge conversion of this signal. Reference numeral 52 denotes an input-side C0D-shift register, which transfers charges from the input circuit 51 at high speed in the row direction to perform serial-to-parallel conversion.

53 are column-direction COD shift registers, which receive data for each row of striking bells in parallel from the input-side CCD shift register 52, and sequentially transfer the charges of each row in the column direction. 54 is an output side COD shift register, and the column direction CCD shift register 53...
・Receive charges for each row one by one from υ, transfer charges for each row at high speed and perform parallel-to-serial conversion. Reference numeral 55 denotes an output circuit which converts the charge transferred by the output side CCD Kuftrenostar 54 into a voltage signal and outputs the voltage signal.

According to such a CCD analog memory, column direction CC
By appropriately selecting the number of charge transfer stages of the D shift registers 53, a delay amount of one field period can be obtained as a whole. In addition, the above-mentioned CCD analog memory, like the interline transfer type solid-state image sensor,
Charge transfer driving in the column direction is performed in the i-straight pre-travel period, and charge transfer driving in the row direction is performed in the horizontal scanning period in the transfer layer/period 4 for one row in the column direction. Therefore, by using an interline transfer type as the solid-state image sensor, the field r
When the above CCD analog memory is used as a delay device,
There is an advantage that the same bolts and bolts can be used for these drives.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to provide a single-panel solid state color television imaging device capable of obtaining color signals with both high horizontal and vertical resolution.

[Brief explanation of drawings]

FIGS. 1 and 2 are diagrams showing a part of the arrangement of color detection areas of a color filter used in a conventional single-panel solid-state color television imaging device, respectively, and FIG. 40 is a diagram showing a part of the arrangement of color detection areas of the color filter shown in FIG. 3; FIG. 5 is an example of the field delay device shown in FIG. 3; FIG. FIG. 1...Red detection area, 2...Green detection area, 3...
- Blue detection area, 31... solid-state image sensor, 32...
Color filter, 33...Field delay device, 34
...Color signal processing circuit, 41...GB row (first row)
, 42...RG row (second row). Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2

Claims (2)

[Claims] (1) One solid-state image sensor in which imaging pixels are arranged in a matrix and signal charges from these pixels are read by repeating first field scanning and second field scanning, and the imaging of this solid-state image sensor A first row provided on the light input surface and having green detection areas and blue detection areas arranged alternately in the row direction corresponding to each pixel, and a first row in which red detection areas and green detection areas are arranged alternately in the row direction. a color filter whose second rows are alternately repeated in the column direction; a field delay device to which the output signal of the solid-state image sensor is guided and which delays it by one field scanning period; Correlation processing with the output signal of the delay device is performed to generate two consecutive images in the row direction of the solid-state image sensor.
1. A solid-state color television imaging device comprising: a color signal processing circuit that derives required three color signals on a pixel-by-pixel basis. (2) The field delay device is a charge coupled device type 1
1. A solid-state color television imaging device as set forth in Patent No. 1, which is a CCD analog memory that can be transferred using a load transfer section.