【考案の詳細な説明】［産業上の利用分野］ 本考案は付加光源を備えたCCDカメラ装置の
改良に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a CCD camera device equipped with an additional light source.
［従来の技術］ CCD素子を用いた従来のCCDカメラ装置にお
いては、第４図に示すように、ある微小輝度I0以
下の入射光に対しては出力信号Ｅが得られない。
一般には、撮像対象を照明してI0以上の入射光を
CCD素子に与えるようにするが、かかる照明を
使用できない場合も多い。このために、被写体か
らの光以外に別の光路でCCDにI0以上の付加光を
与える方法が知られている。[Prior Art] In a conventional CCD camera device using a CCD element, as shown in FIG. 4, an output signal E cannot be obtained for incident light having a certain minute brightness I0 or less.
Generally, the object to be imaged is illuminated with incident light of I0 or more.
However, in many cases, such illumination is not available. For this purpose, a method is known in which additional light of I0 or more is provided to the CCD through a separate optical path in addition to the light from the subject.
第５図は単にCCD素子に付加光源を設けた例
を示し、図中、１は入射光、２はレンズ、３は保
護ガラス、４はCCD素子、５は増幅器、６は付
加光源を表わす。被写体からの入射光１はレンズ
２及び保護ガラス３を経てCCD素子４の撮像部
に入射する。付加光源６からの付加光は直接
CCD素子４に入射し、増幅器５で出力信号とな
る。第６図はCCD素子の面上の光分布（付加光
による）と対応する暗部シエイデイングの波形を
示す。同図ａはI0以上の光の分布が均一でないこ
とを示しており、走査による出力信号もｂのよう
に均一にならず、シエイデイングが発生する。 FIG. 5 simply shows an example in which a CCD element is provided with an additional light source. In the figure, 1 represents incident light, 2 a lens, 3 a protective glass, 4 a CCD element, 5 an amplifier, and 6 an additional light source. Incident light 1 from a subject passes through a lens 2 and a protective glass 3 and enters an imaging section of a CCD element 4 . Additional light from additional light source 6 is directly
The signal enters the CCD element 4 and becomes an output signal at the amplifier 5. FIG. 6 shows the light distribution (due to additional light) on the surface of the CCD element and the corresponding dark area shading waveform. Figure a shows that the distribution of light above I0 is not uniform, and the output signal due to scanning is also not uniform as in Figure b, causing shading.
［考案が解決しようとする課題］ このように、CCD素子へ入射する付加光の分
布が一様でないとCCD素子の出力の暗部信号の
分布が一様でなくなり、ある部分では丁度I0の光
が加わつて、暗部信号も零となるが、他の部分で
はI0よりも大きな光が加わり、暗部信号が零より
大きくなり、画像に対して暗部のシエイデイング
現象が発生し、画質を損なうことになる。[Problem to be solved by the invention] In this way, if the distribution of the additional light incident on the CCD element is not uniform, the distribution of the dark signal of the output of the CCD element will not be uniform, and in some parts, the light of exactly I0 will be , the dark area signal also becomes zero, but in other areas, light greater than I0 is added, the dark area signal becomes greater than zero, and a shading phenomenon occurs in the dark area of the image, resulting in a loss of image quality. Become.
本考案の目的は、CCD素子に付加光を加えて
等価的に高感度化を図り、しかも付加光の不均一
分布によつても暗部シエイデイングが生じない
CCDカメラ装置を提供することである。 The purpose of this invention is to add additional light to the CCD element to equivalently increase the sensitivity, and to avoid dark area shading due to uneven distribution of the additional light.
Our purpose is to provide CCD camera equipment.
［課題を解決するための手段］ 上記目的を達成するため、本考案のCCDカメ
ラ装置は、入射光と共に付加光をCCD素子部に
照光するCCDカメラ装置において、上記入射光
の３色成分のうち２色成分を抽出して前記CCD
素子部に入射せしめる色成分抽出手段と、前記
CCD素子部から出力される前記入射光と前記付
加光とに対応する成分を有する映像信号より輝度
成分信号と所定の色成分信号とを生成して出力す
る輝度・色成分出力手段と、上記輝度成分信号と
色成分信号との差成分信号を生成し出力する差成
分信号出力手段と、を備えたことを特徴とする。[Means for Solving the Problems] In order to achieve the above object, the CCD camera device of the present invention illuminates the CCD element portion with additional light along with the incident light. The two color components are extracted and the CCD
a color component extracting means for causing the color component to be incident on the element section;
a luminance/color component output means for generating and outputting a luminance component signal and a predetermined color component signal from a video signal having components corresponding to the incident light and the additional light outputted from the CCD element section; It is characterized by comprising a difference component signal output means for generating and outputting a difference component signal between the component signal and the color component signal.
［作用］ 本考案の装置において、CCD素子部には、付
加光と入射光から抽出された２色成分が入射され
る。これに対応してCCD素子部から出力される
映像信号より輝度成分信号と所定の色成分信号と
が生成されると共に両信号の差成分信号が出力さ
れる。[Operation] In the device of the present invention, two color components extracted from the additional light and the incident light are incident on the CCD element section. Correspondingly, a luminance component signal and a predetermined color component signal are generated from the video signal output from the CCD element section, and a difference component signal between the two signals is output.
従つて、付加光を設けることでCCD素子を照
明が弱い暗条件で使用しても、付加光の不均一照
明により発生する暗部シエイデイングがCCD素
子の出力から前記差成分信号をとることによつて
消去される。 Therefore, by providing additional light, even if the CCD element is used in a dark condition with weak illumination, dark area shading caused by non-uniform illumination of the additional light can be prevented by taking the difference component signal from the output of the CCD element. will be deleted.
［実施例］ 以下図面に示す本考案の実施例を説明する。第
１図は本考案によるCCDカメラ装置の一実施例
で、第５図と共通する引用番号は第５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
し、７はカラーフイルタ、８は利得制御部、９は
差動増幅器、１０は出力信号を表わす。説明の便
宜上、CCD素子４はＲ，Ｇ，Ｂの絵素構造を持
つものとする。また、第２図ａにカラーフイルタ
７の構成の一例を示すが、特にストライプ型の必
要はない。第１図のカラーフイルタ７は、入射光
からCCD素子４のカラー画像の２種に対応する
２色成分のみを抽出する分光特性のカラーフイル
タとする。ここではカラーフイルタ７として黄の
フイルタを用い、従つて、入射光から抽出された
２色成分がCCD素子４のカラー画像のＲとＧの
部分に入射し、Ｂの部分には入射しないものとす
る。付加光源６から来る付加光は白の光源色とす
る。CCD素子４は入射される光のＲ，Ｇ，Ｂの
各色成分に対応する成分信号、ER，EG，EBの出
力端子を持つている。これらの端子からの出力信
号をNTSC信号に変換して出力している場合もあ
る。[Examples] Examples of the present invention shown in the drawings will be described below. FIG. 1 shows an embodiment of a CCD camera device according to the present invention, in which the reference numbers common to FIG. 5 represent the same or corresponding parts as in FIG. 5, 7 is a color filter, 8 is a gain. In the control section, 9 is a differential amplifier, and 10 is an output signal. For convenience of explanation, it is assumed that the CCD element 4 has an R, G, B picture element structure. Further, although an example of the configuration of the color filter 7 is shown in FIG. 2a, it does not particularly need to be of a stripe type. The color filter 7 in FIG. 1 is a color filter with spectral characteristics that extracts only two color components corresponding to two types of color images of the CCD element 4 from the incident light. Here, a yellow filter is used as the color filter 7, and therefore, the two color components extracted from the incident light are assumed to be incident on the R and G parts of the color image of the CCD element 4, but not on the B part. do. The additional light coming from the additional light source 6 has a white light source color. The CCD element 4 has output terminals for component signals ER, EG, andEB corresponding to theR ,G , and B color components of the incident light. In some cases, the output signals from these terminals are converted to NTSC signals and output.
従つて、CCD素子４の出力信号は、第２図ｂ
に示すように、ER，EG，EBの時系列信号となる。 Therefore, the output signal of the CCD element 4 is as shown in FIG.
As shown in the figure, it becomes a time series signal of ER , EG , and EB .
EY＝ER＋EG ……(1)であるから、輝度信号EYはＲとＧに対応する出
力ER，EGを加算することにより得られる。 Since EY =ER +EG (1), the luminance signal EY is obtained by adding the outputs ER and EG corresponding to R and G.
このため前記実施例において、前記増幅器５
は、例えば、第３図に示す如く、少なくとも
CCD素子４のER出力１１とEG出力１２とを加算
する加算回路１４を含み、EY出力１５とEB出力
１３とを発生するように構成される。 Therefore, in the embodiment, the amplifier 5
For example, as shown in Figure 3, at least
It includes an adder circuit 14 that adds the ER output 11 and the EG output 12 of the CCD element 4, and is configured to generate an EY output 15 and an EB output 13.
以下、上記実施例の動作を説明する。 The operation of the above embodiment will be explained below.
第２図ｂはカラーフイルタ７を通したCCD素
子４への入射光を示し、Ｒ，Ｇの素子部にのみ入
射し、Ｂ素子部への入射光は零である。同図ｃは
付加光の分布を示す。いずれもCCD素子の閾値
であるI0以上の入射光となつているが、場所によ
り光分布にむらがある。結局、第２図のｂ＋ｃが
CCD素子４の入射光となるので、対応するCCD
素子の出力信号は第２図ｄとなる。増幅器５から
は前述したように、輝度信号EY１５とEB信号１
３が出力される。EB信号１３は利得制御部８で
振幅を調節してから、EY信号１５と共に差動増
幅器９に加えて差成分信号（EY−EB）１０を得
る。 FIG. 2b shows the incident light on the CCD element 4 through the color filter 7, which is incident only on the R and G element parts, and the incident light on the B element part is zero. Figure c shows the distribution of additional light. In both cases, the incident light is above I0 , which is the threshold value of the CCD element, but the light distribution is uneven depending on the location. In the end, b+c in Figure 2
Since it becomes the incident light of CCD element 4, the corresponding CCD
The output signal of the element is shown in FIG. 2d. As mentioned above, the amplifier 5 outputs the luminance signal EY 15 and the EB signal 1.
3 is output. After the amplitude of the EB signal 13 is adjusted by a gain control unit 8, the E B signal 13 is sent to a differential amplifier 9 together with an EY signal 15 to obtain a difference component signal (EY −EB ) 10.
第２図ｄのＲとＧに対応するER，EGの平均が
EYとなるので、これから付加光によるEBの分を
差し引くと、第２図ｅのように、ｂの入射光分布
に忠実に対応した出力信号が得られる。 The average of ER and EG corresponding to R and G in Figure 2 d is
Since EY is obtained, by subtracting EB due to the additional light from this, an output signal that faithfully corresponds to the incident light distribution of b is obtained, as shown in Fig. 2 e.
［考案の効果］ 以上説明した通り、本考案によれば、付加光よ
りCCD素子を照明が弱い暗条件で使用する場合
でも、暗部シエイデイングのない、画質のよい画
像を得ることができるという利点が得られる。[Effects of the invention] As explained above, the invention has the advantage that even when using the CCD element in a dark condition where the illumination is weaker than that of the additional light, it is possible to obtain a high-quality image without dark area shading. can get.
第１図は本考案によるCCDカメラ装置の一実
施例の構成を示すブロツク図、第２図はCCD素
子における光量の微細分布と出力信号の関係を示
す図、第３図はCCD素子出力の説明図、第４図
はCCD素子の入射光−出力信号特性図、第５図
はCCD素子に付加光を加える場合の原理図、第
６図は付加光によるシエイデイングを説明する図
である。 １……入射光、２……レンズ、３……保護ガラ
ス、４……CCD素子、５……増幅器、６……付
加光源、７……カラーフイルタ、８……利得制御
部、９……差動増幅器、１０……出力信号。 Fig. 1 is a block diagram showing the configuration of an embodiment of the CCD camera device according to the present invention, Fig. 2 is a diagram showing the relationship between the fine distribution of light amount in the CCD element and the output signal, and Fig. 3 is an explanation of the output of the CCD element. 4 is an incident light-output signal characteristic diagram of a CCD element, FIG. 5 is a principle diagram when adding additional light to the CCD element, and FIG. 6 is a diagram explaining shading due to additional light. 1... Incident light, 2... Lens, 3... Protective glass, 4... CCD element, 5... Amplifier, 6... Additional light source, 7... Color filter, 8... Gain control section, 9... Differential amplifier, 10...output signal.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988012852UJPH0546389Y2 (en) | 1988-02-02 | 1988-02-02 |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988012852UJPH0546389Y2 (en) | 1988-02-02 | 1988-02-02 |
| Publication Number | Publication Date |
|---|---|
| JPH01117187U JPH01117187U (en) | 1989-08-08 |
| JPH0546389Y2true JPH0546389Y2 (en) | 1993-12-03 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988012852UExpired - LifetimeJPH0546389Y2 (en) | 1988-02-02 | 1988-02-02 |
| Country | Link |
|---|---|
| JP (1) | JPH0546389Y2 (en) |
| Publication number | Publication date |
|---|---|
| JPH01117187U (en) | 1989-08-08 |
| Publication | Publication Date | Title |
|---|---|---|
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