Unlock instant, AI-driven research and patent intelligence for your innovation.

Image sensing apparatus having autofocus control function

A technology of automatic focusing and sensing equipment, which is applied in the direction of focusing devices, image communication, static cameras, etc., and can solve the problems that users miss pressing the shutter and it takes a long time

Inactive Publication Date: 2006-01-18
CASIO COMPUTER CO LTD
View PDF0 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, it takes a long time to complete the AF operation based on contrast detection, and the user may miss the opportunity to press the shutter

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Image sensing apparatus having autofocus control function
  • Image sensing apparatus having autofocus control function
  • Image sensing apparatus having autofocus control function

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0038] figure 1 is a block diagram showing a schematic arrangement of the digital camera 1 . The digital camera 1 has an AF function based on contrast detection. A digital camera 1 includes a focus lens 2, a zoom lens 3, a CCD 4, a unit circuit 5, a TG (timing generator) 6, a DRAM 7, a ROM 8, a CPU 9, an image display 10, a RAM 11, a card interface 12, and a motor drive block 14 and key input unit 15 . The memory card 13 is freely detachably inserted into a card slot (not shown) of the camera body, and connected to the card interface 12 .

[0039] Each of the focus lens 2 and the zoom lens 3 includes a plurality of lenses (not shown). Although not shown, the motor drive block 14 is formed by a focus motor and a zoom motor that drive the focus lens and the zoom lens along the optical axis, and a motor driver that drives the focus lens respectively according to a control signal sent by the CPU 9. motor and zoom motor.

[0040] The CCD 4 photoelectrically converts an object ...

no. 2 example

[0138] A second embodiment of the present invention is described below.

[0139] The digital camera according to the second embodiment searches for an in-focus lens position by moving the focus lens 2 within a narrow range when a still image AF process is specified while displaying a direct image. More specifically, a moving image AF process is performed during direct image display. When the shutter button is pressed halfway during direct image display, the special still image AF search for interruption described in the first embodiment is performed.

[0140] The second embodiment also uses the same figure 1 A digital camera of the same configuration as shown in , but the function of each constituent part is different.

[0141] When the user half-presses the shutter button of the key input unit 15, the CPU 9 designates the still image AF operation to start.

[0142] The CPU 9 determines whether the still image pickup AF operation in the state (direct image display state) in...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

When still picture AF operation designated during moving picture pick-up / recording starts, the current position of an AF lens is acquired (S42), and the AF lens is moved by X addresses from the lens position (S43). The AF lens is moved to the Yth address in an opposite direction from the lens position to which the AF lens has been moved by X addresses, and an AF evaluation value is detected for each address (S44). Whether the peak value of the AF evaluation value has been detected is determined (S45). If so, whether the peak value is larger than the threshold is determined (S46). If the peak value is determined larger, the AF lens is moved to a lens position at which the peak value has been obtained (S48). Hence, still picture AF operation can be performed within a short time during moving picture pick-up / recording.

Description

field of invention [0001] The present invention relates to an image sensing device and its automatic focus control method, more particularly, the present invention relates to an image sensing device with still image pickup function and moving image pickup function and its automatic focus control method. technical background [0002] A typical conventional autofocus (hereinafter referred to as AF) control method for a digital camera as a kind of image sensing device is contrast detection. In contrast detection, the magnitude of a contrast component (high frequency component) in an image signal periodically output from an image sensing element such as a CCD is evaluated when a focus lens is moved. The focus lens is moved to the lens position where the evaluation value is the largest, thereby bringing the lens into focus. [0003] In general, conventional digital cameras temporarily move the focus lens to one lens end and then move it to the other lens end in response to a hal...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H04N5/232G03B13/36G02B7/28G02B7/36G06F13/00H04N5/235H04N101/00
CPCH04N5/23212H04N5/23245H04N23/673H04N23/667H04N23/63G03B13/36H04N23/67
Inventor 是木卓
Owner CASIO COMPUTER CO LTD