JP2516367B2 - Imaging / display method - Google Patents
Imaging / display methodInfo
- Publication number
- JP2516367B2 JP2516367B2 JP62141990A JP14199087A JP2516367B2 JP 2516367 B2 JP2516367 B2 JP 2516367B2 JP 62141990 A JP62141990 A JP 62141990A JP 14199087 A JP14199087 A JP 14199087A JP 2516367 B2 JP2516367 B2 JP 2516367B2
- Authority
- JP
- Japan
- Prior art keywords
- display
- frequency
- image pickup
- image
- sampling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000003384 imaging method Methods 0.000 title claims description 9
- 238000000034 method Methods 0.000 title claims description 4
- 238000005070 sampling Methods 0.000 claims description 19
- 238000010586 diagram Methods 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 6
- 238000001444 catalytic combustion detection Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 3
- 238000003491 array Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000012952 Resampling Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Landscapes
- Transforming Light Signals Into Electric Signals (AREA)
- Television Systems (AREA)
Description
【発明の詳細な説明】 A.産業上の利用分野 本発明は、CCDのような撮像素子における撮像／表示
方式に関する。The present invention relates to an image pickup / display system in an image pickup device such as a CCD.
B.発明の概要 撮像素子と表示素子が絵素構造を持つ場合に、両者の
絵素配列（絵素の空間周波数、カラー素子配列）を等し
くして、同一周期の駆動信号で撮像素子および表示素子
を駆動し、撮像出力に設けられる低域フィルタを除いて
再現画像の空間解像度の低下を防ぐ。B. Outline of the invention When the image sensor and the display element have a pixel structure, the pixel arrays (spatial frequency of the pixels and color element array) of both are made equal, and the image sensor and the display are driven by the drive signal of the same cycle. The element is driven, and the spatial resolution of the reproduced image is prevented from lowering except for the low-pass filter provided in the imaging output.
C.従来の技術 近年撮像素子には、例えばCCDのように、撮像面が絵
素配列のものが多くなってきている。一方、表示系も、
液晶（LCD）を主体に、個体表示素子の多くは絵素配列
となっている。C. Conventional Technology In recent years, many image pickup devices, such as CCDs, have an image pickup surface with a pixel array. On the other hand, the display system also
Mainly liquid crystal (LCD), most of the individual display elements are arranged in pixels.
絵素配列は空間的なサンプリングと同義である。した
がって、撮像素子で連続した入力情報を空間サンプリン
グし、その信号を走査機構に基づいて時系列のPAM信号
として、撮像素子出力とする。多くの場合、時間的な低
域フィルタを通して、撮像素子出力の持つサンプリング
性を排除して表示系に再生する。もし、この低域フィル
タが十分に高周波成分を低減してないと、表示素子の空
間サンプリングである絵素構成により偽信号（画像）を
発生することになる。Pixel array is synonymous with spatial sampling. Therefore, continuous input information is spatially sampled by the image sensor, and the signal is output as an image sensor as a time-series PAM signal based on the scanning mechanism. In many cases, the sampling property of the output of the image pickup device is eliminated through a temporal low-pass filter to reproduce the image on the display system. If this low-pass filter does not sufficiently reduce high-frequency components, a false signal (image) will be generated due to the pixel configuration that is spatial sampling of the display element.
このことを第３図から第５図までに示す。第３図は従
来の撮像／表示とも絵素構造を持つ際の伝送系の図式図
で、図中、１は光入力、２は撮像素子においてサンプリ
ングによって映像周波数fs′を持つ撮像絵素構造とする
ことを表わす表示、３は遮断周波数fc1の低域フィル
タ、４は表示素子においてfs″の周波数で再サンプリン
グして表示絵素構造とすることを表わす表示、５は表示
装置、６は観視者を表わす。第４図は第３図に示す系の
いろいろな部分における信号波形を示す図で、（ａ）は
光入力、（ｂ）はサンプリング後の信号、（ｃ）は低域
フィルタ後の信号、（ｄ）は再サンプリング後の信号を
示す。第５図は撮像素子（ａ）および表示素子（ｂ）に
おける絵素構造を示す。撮像素子の空間サンプリング周
波数fsは走査により映像周波数fs′となる。したがっ
て、サンプリング定理により低域フィルタの遮断周波数
fc1は、 ならば、後でfs″の周波数で再サンプリングしても、偽
信号を生じない。一般に撮像素子の映像周波数に換算し
たサンプリング周波数fs″は等しくない。This is shown in FIGS. 3 to 5. FIG. 3 is a schematic diagram of a transmission system in which a conventional image pickup / display has a pixel structure. In the figure, 1 is an optical input, and 2 is an image pickup pixel structure having a video frequency fs' by sampling in an image sensor. 3 is a low-pass filter having a cutoff frequency fc 1 , 4 is a display indicating that a display element is resampled at a frequency of fs ″ to form a display pixel structure, 5 is a display device, and 6 is a display device. Fig. 4 shows a signal waveform in various portions of the system shown in Fig. 3, (a) is an optical input, (b) is a sampled signal, and (c) is a low-pass filter. 5 shows the signal after the resampling, Fig. 5 shows the pixel structure in the image pickup device (a) and the display device (b), and the spatial sampling frequency fs of the image pickup device is the image frequency by scanning. fs'. Therefore, Sampling The cut-off frequency of the low-pass filter by the theorem
fc 1 is In that case, a false signal will not be generated even if re-sampling is performed at a frequency of fs ″ later. Generally, the sampling frequencies fs ″ converted into the image frequency of the image sensor are not equal.
fs′≠fs″ このため、撮像素子出力の低域フィルタの遮断周波数
はfc1≒1/3fs′程度にする。このことは表示系の解像度
を低下させ、画質が十分にならない欠点となる。fs ′ ≠ fs ″ Therefore, the cut-off frequency of the low-pass filter of the image sensor output is set to about fc 1 ≅1 / 3 fs', which lowers the resolution of the display system and causes a drawback of insufficient image quality.
D.発明が解決しようとする問題点 本発明の目的は、撮像／表示とも絵素構造を持つ系の
再現画像の空間解像力を向上することを可能にする撮像
／表示方式を提供することである。D. Problems to be Solved by the Invention It is an object of the present invention to provide an imaging / display system that enables to improve the spatial resolution of a reproduced image of a system having a pixel structure for both imaging / display. .
E.問題点を解決するための手段 上記目的を達成するために、本発明による撮像／表示
方式は絵素構造の撮像手段において、所定の周波数で絵
素のサンプリングを行ない、絵素構造の表示手段におい
て、上記撮像手段と同一の周波数で絵素のサンプリング
を行なうことを要旨とする。E. Means for Solving the Problems In order to achieve the above object, the image pickup / display system according to the present invention displays the pixel structure by sampling the pixel at a predetermined frequency in the image pickup structure of the pixel structure. In the means, the gist is to perform sampling of picture elements at the same frequency as the image pickup means.
F.作用 本発明による方式の原理的概念図を第１図に示す。撮
像側の絵素のサンプリング周期と表示側の絵素のサンプ
リング周期を等しくして、第３図で用いた遮断周波数fc
1の低域フィルタを除去し、再現像の空間分解能の向上
を図る。F. Action The principle conceptual diagram of the method according to the present invention is shown in FIG. The sampling frequency of the picture element on the imaging side and the sampling cycle of the picture element on the display side are made equal, and the cutoff frequency fc used in FIG.
The low pass filter of 1 is removed to improve the spatial resolution of redevelopment.
G.実施例 以下に、図面を参照しながら、実施例を用いて本発明
を一層詳細に説明するが、それらは例示に過ぎず、本発
明の枠を越えることなしにいろいろな変形や改良があり
得ることは勿論である。G. Examples Hereinafter, the present invention will be described in more detail with reference to the drawings with reference to the Examples, but these are merely examples, and various modifications and improvements can be made without departing from the scope of the present invention. Of course it is possible.
第１図は本発明による撮像／表示方式を図式的に示す
図で、図中、第３図と共通する引用番号は第３図におけ
るものと同じか、またはそれに対応する部分を表わす。
図示のように、撮像側の絵素のサンプリング周期と表示
側の絵素のサンプリング周期が等しいので、遮断周波数
fc1の低減フィルタが必要ではなく、再現像の空間分解
能の向上を図ることができる。FIG. 1 is a diagram schematically showing an image pickup / display system according to the present invention. In the figure, reference numerals common to FIG. 3 indicate the same or corresponding portions as those in FIG.
As shown in the figure, the sampling frequency of the picture element on the imaging side is the same as the sampling cycle of the picture element on the display side.
No reduction filter for fc 1 is required, and the spatial resolution of redevelopment can be improved.
第２図は画像の水平方向の走査についての映像信号の
帯域の変化を示す。撮像側では周波数fs′でサンプリン
グしているので、撮像素子出力信号には０〜fs′/2の周
波数成分（斜線を施されている部分）が含まれている。
一般には、伝送して、再サンプリングする際の偽信号を
生じないようにするために、低減フィルタ（遮断周波数
fc1）を用いる。fc1≒1/3fs′が現実的な特性であり、
第２図の一点鎖線で示す理想的なフィルタの場合に較べ
て伝送成分が消失する。本発明では、撮像素子の空間サ
ンプリング周波数と表示素子の空間サンプリング周波数
を一致させることにより、遮断周波数fc1の低域フィル
タを除外して撮像側でのサンプリング（周波数fs′）に
よる伝送成分０〜fs′/2を全て表示素子に再現する。FIG. 2 shows the change of the band of the video signal in the horizontal scanning of the image. Since the image is sampled at the frequency fs ', the image sensor output signal includes frequency components 0 to fs' / 2 (hatched portions).
Generally, a reduction filter (cutoff frequency) is used to prevent spurious signals from being transmitted and resampled.
fc 1 ) is used. fc 1 ≈ 1 / 3fs ′ is a realistic characteristic,
Compared to the case of the ideal filter shown by the one-dot chain line in FIG. 2, the transmission component disappears. In the present invention, by matching the spatial sampling frequency of the image sensor and the spatial sampling frequency of the display element, the transmission components 0 to 0 by sampling (frequency fs') on the imaging side are excluded by excluding the low-pass filter of the cutoff frequency fc 1. All fs' / 2 are reproduced on the display device.
このために撮像素子としてCCDを用いる場合のクロッ
ク周波数（CCDの電荷転送の周波数）と表示素子としてL
CDを用いる場合のクロック周波数を等しくすればよい。Therefore, when the CCD is used as the image sensor, the clock frequency (frequency of charge transfer of CCD) and L as the display element are used.
The clock frequency when using a CD may be equal.
勿論、水平方向のみでなくて垂直方向に対しても撮像
素子と表示素子の絵素数を等しくする。Of course, the number of picture elements of the image pickup device and the display device is made equal not only in the horizontal direction but also in the vertical direction.
さらに、カラー撮像とカラー表示の場合には、カラー
の絵素配列を等しくすることにより忠実な色再現が可能
となる。特に、カラー撮像素子の出力をNTSCのように多
重化する場合に較べて著しく色信号の解像力が向上す
る。たゞし、撮像素子と表示素子を結ぶ伝送線は広帯域
を必要とし、短距離の伝送、例えば、車輌のバックアイ
カメラシステムに適している。Further, in the case of color image pickup and color display, it is possible to reproduce colors faithfully by making the color pixel arrays the same. In particular, the resolution of color signals is significantly improved as compared with the case where the output of the color image pickup device is multiplexed like NTSC. However, the transmission line connecting the image pickup device and the display device requires a wide band and is suitable for short-distance transmission, for example, a vehicle back-eye camera system.
H.発明の効果 以上説明した通り、本発明によれば、モノクロームで
は、撮像素子出力の低域フィルタを除くことで表示系の
再現像の水平および垂直の空間撮像度を高めて鮮鋭な画
像が得られ、カラーでは、多重化を行なわないので、NT
SCのような色度信号の帯域制限による解像度劣化がない
という利点が得られる。H. Effects of the Invention As described above, according to the present invention, in monochrome, a sharp image can be obtained by increasing the horizontal and vertical spatial image pickup degree of redevelopment of the display system by removing the low pass filter of the image pickup device output. It is obtained, and NT does not perform multiplexing in color, so NT
The advantage is that there is no degradation of resolution due to band limitation of chromaticity signals like SC.
第１図は本発明による撮像／表示とも絵素構造を持つ際
の伝送方式を図示的に示す図、第２図は画像の水平方向
の走査についての映像信号の帯域の変化を示す図、第３
図は従来の撮像／表示系の図式図、第４図は第３図に示
す系のいろいろな部分における信号波形を示す図、第５
図は撮像素子および表示素子における絵素構造を示す図
である。 １……光入力、２……撮像素子においてサンプリングに
よって映像周波数fs′を持つ撮像絵素構造とすることを
表わす表示、３……遮断周波数fc1の低域フィルタ、４
……表示素子においてfs″の周波数で再サンプリングし
て表示絵素構造とすることを表わす表示、５……表示装
置、６……観視者。FIG. 1 is a diagram schematically showing a transmission method when a picture element structure is provided for both image pickup / display according to the present invention, and FIG. 2 is a diagram showing a change in a band of a video signal for horizontal scanning of an image Three
FIG. 4 is a schematic diagram of a conventional imaging / display system, FIG. 4 is a diagram showing signal waveforms in various parts of the system shown in FIG. 3, and FIG.
The figure is a diagram showing a pixel structure in an image sensor and a display element. 1 ... Optical input, 2 ... Display indicating that an image pickup pixel structure having a video frequency fs' is obtained by sampling in the image pickup element, 3 ... Low-pass filter with cutoff frequency fc 1
... Display indicating that the display element is resampled at a frequency of fs "to form a display pixel structure, 5 ... Display device, 6 ... Viewer.
Claims (1)
の周波数で絵素のサンプリングを行ない、 （ｂ）絵素構造の表示手段において、上記撮像手段と同
一の周波数で絵素のサンプリングを行なう ことを特徴とする撮像／表示方式。1. An image pickup device having a picture element structure (a) performs sampling of a picture element at a predetermined frequency, and (b) a display means having a picture element structure samples a picture element at the same frequency as the image pickup means. An imaging / display method characterized by performing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62141990A JP2516367B2 (en) | 1987-06-05 | 1987-06-05 | Imaging / display method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62141990A JP2516367B2 (en) | 1987-06-05 | 1987-06-05 | Imaging / display method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63305687A JPS63305687A (en) | 1988-12-13 |
| JP2516367B2 true JP2516367B2 (en) | 1996-07-24 |
Family
ID=15304830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62141990A Expired - Lifetime JP2516367B2 (en) | 1987-06-05 | 1987-06-05 | Imaging / display method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2516367B2 (en) |
-
1987
- 1987-06-05 JP JP62141990A patent/JP2516367B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63305687A (en) | 1988-12-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100666290B1 (en) | Image pick up device and image pick up method | |
| US4633303A (en) | Two-dimensional bandwidth compensating circuit for an endoscope using a solid state image pick-up device | |
| JP2936760B2 (en) | Color television camera device | |
| EP0101600B1 (en) | Video signal recording apparatus | |
| US4595954A (en) | Image signal reproduction circuit for solid-state image sensor | |
| JPH08172635A (en) | Image pickup device | |
| JPH11338425A (en) | Liquid crystal display device and electronic camera | |
| JPH0640665B2 (en) | Output signal reproduction circuit of solid-state imaging device | |
| JP2516367B2 (en) | Imaging / display method | |
| US7405759B2 (en) | Imaging with spectrally dispersive element for aliasing reducing | |
| JP2615572B2 (en) | Electronic still camera | |
| JP2666260B2 (en) | Electronic still camera | |
| JP3728075B2 (en) | Imaging method and imaging apparatus | |
| JP3600638B2 (en) | Electronic endoscope device | |
| JPH05328205A (en) | Video signal processing unit | |
| JPH11146256A (en) | Image pickup device | |
| JP2803101B2 (en) | Television camera | |
| KR100272338B1 (en) | Device for cahanging an output signal of interline transfer ccd | |
| JPH03129978A (en) | Solid-state image pickup device | |
| JP2785211B2 (en) | Color television camera device | |
| JPS63123281A (en) | Image pickup device | |
| JPH06178181A (en) | High definition image pickup device, high definition image recording and reproducing device | |
| JPS6339293A (en) | Video signal forming device | |
| JPH0990238A (en) | Electronic endoscope device | |
| JPH07288825A (en) | Solid-state image pickup device |