JPH0415362U - - Google Patents
Info
- Publication number
- JPH0415362U JPH0415362U JP5633790U JP5633790U JPH0415362U JP H0415362 U JPH0415362 U JP H0415362U JP 5633790 U JP5633790 U JP 5633790U JP 5633790 U JP5633790 U JP 5633790U JP H0415362 U JPH0415362 U JP H0415362U
- Authority
- JP
- Japan
- Prior art keywords
- level
- circuit
- black
- detection circuit
- blackest
- 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
- 238000001514 detection method Methods 0.000 claims description 11
- 238000010586 diagram Methods 0.000 description 10
Landscapes
- Picture Signal Circuits (AREA)
Description
第１図は本考案の黒レベル補正回路の一実施例
の構成を示すブロツク図、第２図は第１図におけ
る黒面積検出回路の一実施例の構成を示す回路図
、第３図は第１図の黒面積検出回路の入出力特性
図、第４図は、本考案の黒レベル補正回路の他の
実施例の構成を示すブロツク図、第５図および第
１１図は従来の黒レベル補正回路の一例の構成を
示すブロツク図、第６図は第１図、第４図、第５
図、第１１図における最黒レベル検出回路の一実
施例の構成を示すブロツク図、第７図は最黒レベ
ル検出回路の入出力特性図、第８図は黒レベル変
化回路の制御特性図、第９図および第１０図は黒
レベル変化回路の入出力特性図、第１２図乃至第
１４図は第５図の例の動作を説明する図である。
２……クランプ回路、３……最黒レベル検出回
路、４……基準電圧発生回路、５……黒レベル変
化回路、２１……補償回路、２２……黒面積検出
回路、４１……ハイパスフイルタ、４４……ロー
パスフイルタ。
FIG. 1 is a block diagram showing the configuration of one embodiment of the black level correction circuit of the present invention, FIG. 2 is a circuit diagram showing the configuration of one embodiment of the black area detection circuit in FIG. Figure 1 is an input/output characteristic diagram of the black area detection circuit, Figure 4 is a block diagram showing the configuration of another embodiment of the black level correction circuit of the present invention, and Figures 5 and 11 are conventional black level correction circuits. A block diagram showing the configuration of an example of the circuit, Figure 6 is similar to Figures 1, 4, and 5.
11 is a block diagram showing the configuration of an embodiment of the blackest level detection circuit, FIG. 7 is an input/output characteristic diagram of the blackest level detection circuit, FIG. 8 is a control characteristic diagram of the black level changing circuit, 9 and 10 are input/output characteristic diagrams of the black level changing circuit, and FIGS. 12 to 14 are diagrams for explaining the operation of the example shown in FIG. 5. 2... Clamp circuit, 3... Blackest level detection circuit, 4... Reference voltage generation circuit, 5... Black level change circuit, 21... Compensation circuit, 22... Black area detection circuit, 41... High pass filter , 44...Low pass filter.
Claims (1)
生する黒レベル検出回路と、 前記最黒レベル検出回路が出力する制御信号に
対応して、前記輝度信号の黒レベルを変化させる
黒レベル変化回路と、 前記輝度信号の黒レベルの面積を検出する黒面
積検出回路と、 前記黒面積検出回路の出力に対応して、前記最
黒レベル検出回路が出力する制御信号を補償する
補償回路とを備えることを特徴とする黒レベル補
正回路。[Claims for Utility Model Registration] A black level detection circuit that detects the blackest level of a luminance signal and generates a control signal; and a black level detection circuit that detects the blackest level of the luminance signal and generates a control signal; a black level change circuit that changes the level; a black area detection circuit that detects the area of the black level of the luminance signal; and a control signal that the blackest level detection circuit outputs in response to the output of the black area detection circuit. A black level correction circuit comprising: a compensation circuit for compensating for
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5633790U JPH0415362U (en) | 1990-05-28 | 1990-05-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5633790U JPH0415362U (en) | 1990-05-28 | 1990-05-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0415362U true JPH0415362U (en) | 1992-02-07 |
Family
ID=31580071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5633790U Pending JPH0415362U (en) | 1990-05-28 | 1990-05-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0415362U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS567575A (en) * | 1979-06-29 | 1981-01-26 | Mitsubishi Electric Corp | Color television receiver |
-
1990
- 1990-05-28 JP JP5633790U patent/JPH0415362U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS567575A (en) * | 1979-06-29 | 1981-01-26 | Mitsubishi Electric Corp | Color television receiver |
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