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1. 发明专利

JPH06245139A IMAGE PICKUP DEVICE 失效
公开(公告)号：JPH06245139A
公开(公告)日：1994-09-02
申请号：JP2565993
申请日：1993-02-15
申请人： HITACHI LTD , HITACHI VIDEO & INF SYST
发明人： KURASHIGE TOMOYUKI , TARUMI HIROYUKI , IMAIDE TAKUYA , TSUGI YASUSHI , KAMI HIROAKI , TAKASE SATOSHI
IPC分类号： H04N5/235
摘要： PURPOSE:To always reproduce contrast against the change in an object. CONSTITUTION:A microcomputer 5 fetches a video signal A from a signal processing circuit 4 to discriminate whether an absolute illuminance of an object 1 is changed or an irregular reflectance is changed, and accordingly an aperture of an iris 2, a shutter speed of an image pickup element 3 and a gain of a signal processing circuit 4 are controlled. The discrimination as above is made by a change in a level distribution of video signals A, and when it is discriminated that the absolute illuminance is changed through a change of a light source, proper exposure control is executed so that the signal level is constant, and when it is discriminated that an object 1 is changed due to movement of the object or change in camera work or the like resulting in causing a change in its irregular reflectance, the exposure control is made unchanged. The picture is always reproduced with fidelity against the change in the irregular reflectance of the object by executing the exposure control depending on the absolute illuminance or the irregular reflectance of the object.

2. 发明专利

JPH06350903A EXPOSURE CONTROLLER FOR VIDEO CAMERA 失效
公开(公告)号：JPH06350903A
公开(公告)日：1994-12-22
申请号：JP14065393
申请日：1993-06-11
申请人： HITACHI LTD , HITACHI VIDEO & INF SYST
发明人： TARUMI HIROYUKI , KURASHIGE TOMOYUKI , KAMI HIROAKI , IMAIDE TAKUYA , TSUGI YASUSHI
IPC分类号： H04N5/232 , H04N5/235
摘要： PURPOSE:To attain exposure control by which the effect of a direct incidence light source is eliminated and an object is displayed brightness in response to an irregular reflectance of the object. CONSTITUTION:Luminance information A of a luminance versus frequency distribution is generated by detecting frequency distribution for each luminance level and for each unit time from a luminance signal generated by a signal processing circuit 4. A microcomputer 5 converts each luminance level into an illuminance of an object image by using aperture information B, electronic shutter speed information C and signal gain information D to obtain an illuminance versus frequency distribution. Since a direct incidence light source in existence in an object contributes a very high illuminance in the illuminance versus frequency distribution, only the illuminance of an irregular reflecting body is an object for the illuminance versus frequency distribution by excluding the direct incidence light source. A maximum illuminance is obtained from the illuminance versus frequency distribution. The aperture information B, electronic shutter speed information C and signal gain information D are set so that the part with the maximum illuminance gives an optimum luminance signal level.

3. 发明专利

JPH07107364A EXPOSURE CONTROLLER AND EXPOSURE CONTROLLING METHOD OF VIDEO CAMERA 失效
公开(公告)号：JPH07107364A
公开(公告)日：1995-04-21
申请号：JP24470593
申请日：1993-09-30
申请人： HITACHI LTD , HITACHI VIDEO & INF SYST
发明人： TARUMI HIROYUKI , KURASHIGE TOMOYUKI , KAMI HIROAKI , IMAIDE TAKUYA
IPC分类号： H04N5/232
摘要： PURPOSE:To improve the S/N in a photographing condition where an exposure target is smaller than the amplitude output of a rated signal by performing a control so as to widely use the amplitude of the output voltage of an image pickup element within a dynamic range. CONSTITUTION:A signal processing circuit 4 outputs the luminance information 102 of an object image to a microcomputer 5. The microcomputer 5 determines the amplitude of the output signal of an image pickup element 3 in the control state of signal gain 105 from the luminance information 102 of the object image when the output 101 of a signal processing circuit 4 is made a desired output level and the control state of signal gain 105. Next, at least one of a diaphragm 103 and electronic shutter speed 104 is made a new control state so as to widely use the amplitude of the output voltage of the image pickup element 3 within the dynamic range of the image pickup element 3. Further, in the control state of this new diaphragm value 103 and the electronic shutter speed 104, signal gain 105 is made a new control state so as to make the output 101 of the signal processing circuit 4 the desired output level.

4. 发明专利

JP2001008212A IMAGE TRANSMISSION METHOD 失效
公开(公告)号：JP2001008212A
公开(公告)日：2001-01-12
申请号：JP17294199
申请日：1999-06-18
申请人： HITACHI LTD , HITACHI VIDEO & INF SYST
发明人： KAMI HIROAKI , KURASHIGE TOMOYUKI , KINUGASA TOSHIRO , KOMATSU KEIICHI
IPC分类号： H04N19/50 , H04N19/12 , H04N19/136 , H04N19/156 , H04N19/164 , H04N19/503 , H04N19/587 , H04N19/59 , H04N7/32
摘要： PROBLEM TO BE SOLVED: To attain optimum picture transmission, in matching with a decoding capability of an MPEG decoding processing section. SOLUTION: A transmission terminal 2 receives a picture signal from a picture input device 1, encodes the picture signal into MPEG picture data, and transmits the data to a reception terminal 3 via a network 4. The reception terminal 3 decodes the MPEG picture data and gives the decoded data to a monitor 5. There is a reception terminal 3 that adds a copy picture to interleaved MPEG picture data resulting interleaving a B picture from the original MPEG picture data, to decode the data into picture signals having a correct frame interval and the other reception terminal 3 that can not correctly decode the interleaved MPEG picture data but can correctly decode the complete MPEG picture data only. Prior to the transmission of data to the reception terminal 3 that has made a transmission request, the transmission terminal 2 detects the decoding capability of the reception terminal 3 of the destination and transmits the interleaved MPEG picture data or the complete MPEG picture data, depending on the decoding capability to the terminal 3.

5. 发明专利

JPH0799601A IMAGE PICKUP DEVICE 失效
公开(公告)号：JPH0799601A
公开(公告)日：1995-04-11
申请号：JP24107793
申请日：1993-09-28
申请人： HITACHI LTD , HITACHI VIDEO & INF SYST
发明人： KAMI HIROAKI , KURASHIGE TOMOYUKI , TARUMI HIROYUKI , IMAIDE TAKUYA , HOJO KEN
IPC分类号： G03B15/03 , H04N5/235 , H04N5/238 , H04N9/04
摘要： PURPOSE:To always obtain proper exposure by using the object illuminance estimated from the control conditions of an image pickup device to control an aperture as normal and automatically lighting/extinguishing a light in accordance with the object illuminance. CONSTITUTION:The illuminance of the object is calculated and estimated by signal volume information 103 and respective control states (control commands) of an aperture value 100, an electronic shutter speed 101, and a signal gain 102. Since a light control signal 104 is generated in accordance with the illuminance of the object to control the turning-on/off state of a light 8, the image pickup device is realized which automatically lights the light 8 in the case of the deficient illuminance of the object and automatically extinguishes the light in the case of the sufficient illuminance to obtain the proper exposure. Hunting that lighting/extinction of the light 8 is periodically repeated is prevented because the value to be compared with the illuminance of the object is changed dependently upon whether the light 8 is already lit or not.

6. 发明专利

JP2001024707A MULTIMEDIA PACKET COMMUNICATION TERMINAL AND MULTIMEDIA PACKET COMMUNICATION NETWORK 失效
公开(公告)号：JP2001024707A
公开(公告)日：2001-01-26
申请号：JP19622199
申请日：1999-07-09
申请人： HITACHI LTD , HITACHI VIDEO & INF SYST
发明人： KURASHIGE TOMOYUKI , KAMI HIROAKI , AZUMA MASAYUKI , KINUGASA TOSHIRO
IPC分类号： H04L12/28 , H04L12/70 , H04L12/56
摘要： PROBLEM TO BE SOLVED: To efficiently transmit different kinds of use information to a reception terminal through a communication network having a limited capacity. SOLUTION: When a document packet and audio and video packets are approximately simultaneously transmitted from transmission terminals 1a and 1b, respectively, through a multimedia packet communication network 6, the transmission order is determined in a base station 7b, which receives them approximately simultaneously according to transmission characteristics described in these packets. These transmission characteristics are determined for each use information to be transmitted (document information, audio and video information, etc.), by transmission terminals 1a and 1b and are comprised of delay characteristics (indicating whether transmission delay should be allowed or not) and reachability (indicating whether complete transmission of information is necessary or not), which are determined according to classifications or properties of use information (whether real-time reproduction is necessary, whether complete transmission of information is necessary, etc.), and priority levels are set to these transmission characteristics, thereby determining the transmission order in the communication network 6.

7. 发明专利

JPH0522653A EXPOSURE CONTROL METHOD FOR IMAGE PICKUP DEVICE 失效
公开(公告)号：JPH0522653A
公开(公告)日：1993-01-29
申请号：JP19363291
申请日：1991-07-09
申请人： HITACHI LTD , HITACHI VIDEO & INF SYST
发明人： KAMI HIROAKI , TARUMI HIROYUKI , KURASHIGE TOMOYUKI , IMAIDE TAKUYA
IPC分类号： G03B7/28 , H04N5/235 , H04N5/238
摘要： PURPOSE:To obtain a proper exposure for an target object at all times by continuously changing the weighting of an average value of a luminance signal and the weighting of the maximum value at the time of generating an exposure control signal according to the luminance distribution of the detected picture. CONSTITUTION:The device is provided with a D/A converter 111, first coefficient circuit 112, second coefficient circuit 113, first comparison circuit 114, peak reference value setting circuit 115, correction amount calculation circuit (K-times circuit) 116, adder circuit 117, second comparison circuit 118, third comparison circuit 119, and luminance distribution decision circuit 120. According to the luminance distribution in the screen, the weighting of an average value Av of a luminance signal and the weighting of the maximum value P at the time of generating an exposure control signal are changed, and the weighting of the maximum value P is increased when an target object part is bright compared with the background. On the contrary, when it is dark compared with the background, the weighting of the average value Av shall be increased. Therefore, even when the contrast between the target object and the background is remarkably different, the proper exposure can be obtained for the target object.

8. 发明专利

JPH0955876A IMAGE PICKUP DEVICE 失效
公开(公告)号：JPH0955876A
公开(公告)日：1997-02-25
申请号：JP20422695
申请日：1995-08-10
申请人： HITACHI LTD , HITACHI VIDEO IND INF SYST INC
发明人： KAMI HIROAKI , NISHIZAWA AKIHITO , KURASHIGE TOMOYUKI , YORIFUJI MASATO
IPC分类号： H04N5/225 , G06T11/60 , G06T11/80 , H04N7/24 , H04N19/00
摘要： PROBLEM TO BE SOLVED: To transmit video and sound information by a bit rate and a compression method which are adapted to a connected personal computer or application software. SOLUTION: A compression/expansion processing circuit 7 and interfaces 9 and 10 for communication are provided in an image pickup device 24. When this device is connected to an external device 21 and is used, a system control microcomputer 14 controls the compression/expansion processing circuit in accordance with information related to the compression method and the compression ratio transmitted from the external device 2.

9. 发明专利

JPH0865570A METHOD FOR CONTROLLING EXPOSURE OF IMAGE PICKUP DEVICE 失效
公开(公告)号：JPH0865570A
公开(公告)日：1996-03-08
申请号：JP19319494
申请日：1994-08-17
申请人： HITACHI LTD , HITACHI VIDEO IND INF SYST INC
发明人： TODAKA YOSHIHIRO , KAMI HIROAKI , YAMAMOTO NAOKI , IURA NORIYUKI , KURASHIGE TOMOYUKI , IMAIDE TAKUYA
IPC分类号： H04N5/238 , H04N5/335 , H04N5/353 , H04N5/369 , H04N5/3728 , H04N5/376
摘要： PURPOSE: To make it possible to pick up both a moving image and a still image by a simple exposure system by controlling exposure by an electronic shutter while holding a stop on a slightly opened position at the time of exposure control for a moving image, and after receiving a still image pick-up instruction, updating the shutter speed while interlocking with the stop. CONSTITUTION: In exposure control for a moving image, a microcomputer 9 drives a stop drive circuit 5 to hold the stop 2 on a slightly opened position and exposure is controlled by an electronic shutter control circuit 6. After receiving a still image pickup instruction, the shutter speed of the electronic shutter is updated in accordance with an output from a stop detection circuit 51 while closing the stop 2 to control the circuit 6. Since a still image can be picked up within a short exposure time, a still picture with suppressed deterioration of resolution can be photographed and picture quality of a proper level reduced at its exposure error can be maintained.

10. 发明专利

JP2003309808A Video signal reproducing apparatus 审中-公开
标题翻译：视频信号再现设备
公开(公告)号：JP2003309808A
公开(公告)日：2003-10-31
申请号：JP2003113235
申请日：2003-04-17
申请人： Hitachi Advanced Digital Inc , Hitachi Ltd , 株式会社日立アドバンストデジタル , 株式会社日立製作所
发明人： KITADE TAKESHI , YAMAMOTO NAOKI , KAMI HIROAKI
IPC分类号： H04N5/225 , H04N5/91 , H04N5/92
摘要： PROBLEM TO BE SOLVED: To provide a video signal reproducing apparatus capable of recording a still picture during recording of a moving picture.
SOLUTION: A moving picture video signal outputted from a CCD video sensor 3 is converted into a digital moving picture video signal by an analog/ digital converter 5, encoded by an MPEG CODEC 11 or a JPEG CODEC under the control of a microcontroller 9, and recorded in a recording circuit 10. When a shutter trigger is received from an input terminal 15 by a user's shutter operation, the microcontroller 9 forms still picture instruction information and attaches the information to an image (frame) encoded by the MPEG CODEC 11 or the JPEG CODEC as user data. In the case of reproducing a still picture from the recording circuit 10, the user data are searched to extract the encoded image to which the still picture instruction information is attached, and the MPEG CODEC 11 or the JPEG CODEC decoded the encoded image to reproduce the still picture.
COPYRIGHT: (C)2004,JPO
摘要翻译：要解决的问题：提供一种能够在记录运动图像期间记录静止图像的视频信号再现装置。解决方案：由CCD视频传感器3输出的运动图像视频信号由模拟/数字转换器5转换成数字运动图像视频信号，由MPEG编解码器11或JPEG编解码器编码，在微控制器的控制下记录在记录电路10中。当通过用户快门操作从输入端子15接收到快门触发时，微控制器9形成静止图像指令信息，并将该信息附加到由MPEG编解码器编码的图像（帧） 11或JPEG CODEC作为用户数据。在从记录电路10重放静止图像的情况下，搜索用户数据以提取附加有静止图像指示信息的编码图像，并且MPEG CODEC 11或JPEG编解码器解码编码图像，以再现静态图片。版权所有（C）2004，JPO

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