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1. WO1996042167 - FOCUS CONTROLLING METHOD AND VIDEO CAMERA DEVICE

Publication Number WO/1996/042167
Publication Date 27.12.1996
International Application No. PCT/JP1996/001524
International Filing Date 05.06.1996
IPC
H04N 5/232 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
222Studio circuitry; Studio devices; Studio equipment
225Television cameras
232Devices for controlling television cameras, e.g. remote control
CPC
H04N 5/23212
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
222Studio circuitry; Studio devices; Studio equipment ; ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, TV cameras, video cameras, camcorders, webcams, camera modules for embedding in other devices, e.g. mobile phones, computers or vehicles
225Television cameras ; ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, camcorders, webcams, camera modules specially adapted for being embedded in other devices, e.g. mobile phones, computers or vehicles
232Devices for controlling television cameras, e.g. remote control ; ; Control of cameras comprising an electronic image sensor;
23212Focusing based on image signals provided by the electronic image sensor
H04N 5/232123
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
222Studio circuitry; Studio devices; Studio equipment ; ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, TV cameras, video cameras, camcorders, webcams, camera modules for embedding in other devices, e.g. mobile phones, computers or vehicles
225Television cameras ; ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, camcorders, webcams, camera modules specially adapted for being embedded in other devices, e.g. mobile phones, computers or vehicles
232Devices for controlling television cameras, e.g. remote control ; ; Control of cameras comprising an electronic image sensor;
23212Focusing based on image signals provided by the electronic image sensor
232123based on contrast or high frequency components of image signals, e.g. hill climbing method
Applicants
  • SONY CORPORATION [JP]/[JP] (AllExceptUS)
  • ITO, Yujiro [JP]/[JP] (UsOnly)
Inventors
  • ITO, Yujiro
Agents
  • MATSUKUMA, Hidemori
Priority Data
7/14156908.06.1995JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) FOCUS CONTROLLING METHOD AND VIDEO CAMERA DEVICE
(FR) PROCEDE DE MISE AU POINT OPTIQUE ET DISPOSITIF DE CAMERA VIDEO
Abstract
(EN)
A focus control circuit (34) which controls the focus of a video camera is provided with a horizontal-direction evaluation value generating circuit (62) which generates a plurality of evaluation values for the horizontal direction, a vertical-direction evaluation value generating circuit (63) which generates a plurality of evaluation values for the vertical direction, and a microcomputer (64) which performs a prescribed operation upon receiving the evaluation values for the horizontal and vertical directions. The circuit (62) generates the evaluation values corresponding to preset evaluation windows of different sizes. The microcomputer (64) selects evaluation values corresponding to an appropriate evaluation window for judging the contrast of an object out of the supplied evaluation values and controls the focus of the video camera based on the selected evaluation values. Therefore, appropriate evaluation values of the object can be obtained.
(FR)
La présente invention concerne un circuit (34) de commande de mise au point optique qui met en ÷uvre, d'une part un mesureur (62) de distances horizontales fournissant plusieurs mesures horizontales, d'autre part un mesureur (63) de distances verticales fournissant plusieurs mesures verticales, et enfin un micro-ordinateur (64) exécutant des opérations prédéfinies, dès réception des mesures verticales et horizontales. Le mesureur horizontal (62) fournit des mesures correspondant à des fenêtres de référence de différentes tailles. Le micro-ordinateur (64) sélectionne les mesures correspondant à une fenêtre de référence, pour évaluer le contraste d'un objet à partir des mesures fournies, puis commande la mise au point optique de la caméra vidéo en prenant pour base les mesures sélectionnées. Ce principe permet d'obtenir des mesures convenables concernant l'objet.
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