JPS5898611U - Optical low pass filter for color signals - Google Patents
Optical low pass filter for color signalsInfo
- Publication number
- JPS5898611U JPS5898611U JP1981197746U JP19774681U JPS5898611U JP S5898611 U JPS5898611 U JP S5898611U JP 1981197746 U JP1981197746 U JP 1981197746U JP 19774681 U JP19774681 U JP 19774681U JP S5898611 U JPS5898611 U JP S5898611U
- Authority
- JP
- Japan
- Prior art keywords
- optical
- color
- transparent material
- pass filter
- color signal
- 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.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims description 17
- 238000005070 sampling Methods 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims 5
- 239000012780 transparent material Substances 0.000 claims 4
- 238000003384 imaging method Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
Landscapes
- Color Television Image Signal Generators (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第1図は、偽信号の発生のようすを示す図で、第2図は
、光学ローパスフィルター及び撮像素子の光電変換部に
おける空間周波数に対するレスポンス特性を示し、第3
図は、光学ローパスフィルター素子の減衰極周波数及び
素子数を変えた時の偽信号を示す図で、第4図は、一本
考案の一実施例による光学ローパスフィルタの構造を示
す図で、第5図は第4図に示す光学ローパスフィルター
及びこれと組合せる撮像素子の空間周波数に対する
−レスポンスを示す図で、第6図はその組合せによ
って生する偽信号を示す図である。
図面において、11は撮像素子の光電変換部における空
間周波数に対するレスポンス特性、12゜13は折り返
りによって生じる偽信号特性、21 。
は減衰極周波数3.58MH2の単一光学フィルター素
子の特性、22は撮像素子の光電変換部の特性、23は
減衰極用波数3.56MHzの光学ロー −パスフィ
ルター素子を2素子用いた時の特性、31゛は減衰極3
.58 MHzの単一光学くし形フィルター素子時の偽
信号、32は減衰極3,58ME(zの光学フィルター
素子を2素子用いた蒔の偽信号、33は減衰極を3.5
8 MHZ±0.25MHzとし2′素子用いた時の偽
信号、34は減衰極3.58MH2−±0.5MHzと
3.58MHzとの3素子を用いた時の一偽信号、41
.43,45,47はλ/4位相板、42,44は基本
減衰極3.58 MHZの光学くし形フィルター素子、
46,48は基本減衰極7.16 MHzの光学くし形
フィルタ素子、51は第4図の構造の光学ローパスフィ
ルターの特性、52は前記光学ローパスフィルターと組
合せる撮像素子の特性、61は色信号空間す゛ ン
プリング周波付近の成分による偽信号特性、62は色信
号空間サンプリング周波数の2倍付近の成分による偽信
号、63は色信号空間サンプリング周波数の3倍付近の
成分による偽信号を示す。FIG. 1 is a diagram showing how false signals are generated, FIG. 2 is a diagram showing response characteristics to spatial frequencies in the optical low-pass filter and the photoelectric conversion section of the image sensor, and FIG.
The figure shows a false signal when the attenuation pole frequency and the number of elements of an optical low-pass filter element are changed. Figure 5 shows the spatial frequency of the optical low-pass filter shown in Figure 4 and the image sensor combined with it.
- A diagram showing the response, and FIG. 6 is a diagram showing the false signal generated by the combination. In the drawings, reference numeral 11 indicates a response characteristic to a spatial frequency in the photoelectric conversion section of the image sensor, 12 and 13 indicate a false signal characteristic caused by aliasing, and 21. is the characteristic of a single optical filter element with an attenuation pole frequency of 3.58 MHz, 22 is the characteristic of the photoelectric conversion part of the image sensor, and 23 is the characteristic when two optical low-pass filter elements with an attenuation pole frequency of 3.56 MHz are used. Characteristics, 31゛ is attenuation pole 3
.. 58 MHz single optical comb filter element, 32 is a false signal with attenuation pole of 3, 58 ME (z) is a false signal using two optical filter elements, 33 is an attenuation pole of 3.5
8 False signal when using 2' element with MHz ± 0.25 MHz, 34 is one false signal when using three elements with attenuation pole 3.58 MH2 - ± 0.5 MHz and 3.58 MHz, 41
.. 43, 45, 47 are λ/4 phase plates, 42, 44 are optical comb filter elements with a basic attenuation pole of 3.58 MHZ,
46 and 48 are optical comb filter elements with a basic attenuation pole of 7.16 MHz, 51 is the characteristic of the optical low-pass filter having the structure shown in FIG. 4, 52 is the characteristic of the image pickup device to be combined with the optical low-pass filter, and 61 is the color signal. A false signal characteristic due to a component near the spatial sampling frequency, 62 indicates a false signal due to a component near twice the color signal spatial sampling frequency, and 63 indicates a false signal due to a component near three times the color signal spatial sampling frequency.
Claims (1)
いて、少なくとも青、赤の2信号を1つの色信号用撮影
素子より取り出し、他の1つ以上の撮影素子から広帯域
な緑信号あるいは輝度信号を取り出すようになされたカ
ラーカメラにおける伝信号用撮像素子の入射光路に挿入
する色信号用−光学ローパスフィルターにおいて、光学
的−軸性複屈折特性を備えた透明物質によって構成され
、かつその複屈折による常光と異常光の分離方向が水平
走査方向であり、さらに常光と異常光の分離干渉によっ
て生じる空間周波数の基本減衰極が前記色信号用撮像素
子の色信号空間サンプリング周波数の±0.5MHz以
内である光学くし形フィルタ素子を光学的−軸性複屈折
特性を備えた透明物質によるλム位相板を介して複数設
けるとともに、光学的−軸性複屈折特性を備えた透明物
質によって構成され、かつその複屈折による常光、異常
光の分離方向が水平走査方向であり、さらに常光、異常
光の分離干渉によって生じる空間周波数の基本減衰極が
前記色信号撮像素子の色信号空間サンプリング周波数の
2倍の周波数の±0.5MHz以内である光学(し形フ
ィルター素子を光学的−軸性複屈折を備えた透明物質に
よるλ/4位相板を介して一素子以上設けたことを特徴
とする色信号用、 光学ローパスフィルター。Using striped or dot-shaped color separation filters, at least two signals, blue and red, are extracted from one color signal imaging element, and a broadband green signal or luminance signal is extracted from one or more other imaging elements. An optical low-pass filter for color signals inserted into the incident optical path of an image sensor for transmitting signals in a color camera is made of a transparent material with an optical-axial birefringence property, and is made of a transparent material with optical and axial birefringence characteristics, and is capable of separating ordinary light and ordinary light due to its birefringence. An optical system in which the separation direction of the extraordinary light is the horizontal scanning direction, and further, the basic attenuation pole of the spatial frequency caused by separation interference between the ordinary light and the extraordinary light is within ±0.5 MHz of the color signal spatial sampling frequency of the color signal image sensor. A plurality of comb-shaped filter elements are provided via a lambda phase plate made of a transparent material with optical-axial birefringence characteristics, and a plurality of comb-shaped filter elements are provided with a The separation direction of the ordinary light and extraordinary light due to refraction is the horizontal scanning direction, and furthermore, the basic attenuation pole of the spatial frequency caused by the separation interference of the ordinary light and the extraordinary light is at a frequency twice the color signal spatial sampling frequency of the color signal image sensor. Optical for color signals within ±0.5 MHz (characterized in that one or more diamond-shaped filter elements are provided through a λ/4 phase plate made of a transparent material with optical-axial birefringence); low pass filter.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1981197746U JPS5898611U (en) | 1981-12-25 | 1981-12-25 | Optical low pass filter for color signals |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1981197746U JPS5898611U (en) | 1981-12-25 | 1981-12-25 | Optical low pass filter for color signals |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5898611U true JPS5898611U (en) | 1983-07-05 |
Family
ID=30110958
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1981197746U Pending JPS5898611U (en) | 1981-12-25 | 1981-12-25 | Optical low pass filter for color signals |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5898611U (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5445152A (en) * | 1977-09-17 | 1979-04-10 | Victor Co Of Japan Ltd | Optical comb type filter |
JPS55105221A (en) * | 1979-02-05 | 1980-08-12 | Victor Co Of Japan Ltd | Optical comb type filter |
-
1981
- 1981-12-25 JP JP1981197746U patent/JPS5898611U/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5445152A (en) * | 1977-09-17 | 1979-04-10 | Victor Co Of Japan Ltd | Optical comb type filter |
JPS55105221A (en) * | 1979-02-05 | 1980-08-12 | Victor Co Of Japan Ltd | Optical comb type filter |
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