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

Image sensing apparatus and image sensing method

A technology of imaging equipment and imaging elements, which is applied in image communication, television, focusing devices, etc., can solve problems such as difficult and high-precision focusing positions, AF evaluation value deviation, etc., and achieve high-speed and high-precision automatic focusing to prevent false focusing The effect of the function

Inactive Publication Date: 2009-01-07
RICOH KK
View PDF1 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the case of the above-mentioned conventional method, it is difficult to determine the in-focus position accurately, with high precision, and at high speed due to the deviation of the AF evaluation value caused by the noise contained in the video signal.

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 and image sensing method
  • Image sensing apparatus and image sensing method
  • Image sensing apparatus and image sensing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] An example of an imaging method using the imaging apparatus of the present invention will be described. The AF processing in the imaging method of the present invention includes: acquiring an AF evaluation value at a predetermined timing position of the moving focus lens 7-2a; performing a smoothing differential operation using the acquired AF evaluation value; using the result of the smoothing differential operation ( smooth differential value) to perform in-focus state judgment and in-focus position determination. First, the smoothing differential calculation processing of the AF evaluation value will be described.

[0060] Let the AF evaluation value acquired based on the subject image data acquired from the moving focus lens 7-2a at predetermined timing be X[0], and the AF evaluation value acquired a distance before X[0] be X[0]. X[-a], let the AF evaluation value acquired after a number of X[0] be X[a], and let the weight coefficients for each AF evaluation value ...

Embodiment 2

[0075] Next, another embodiment of the imaging method using the imaging apparatus of the present invention will be described. Since the driving method of the focus lens 7-2a and the calculation method of the smoothing differential value in this embodiment are the same as those in Embodiment 1, different processes will be explained emphatically.

[0076] Figure 12 It is a flowchart showing the flow of AF processing in the second embodiment. Each operation step is marked in the form of S121, S122.... First, signal waiting processing is performed until the falling edge of the VD signal is detected (S121), and the falling edge of the VD signal is detected as a trigger to drive the focus motor 7-2b corresponding to a predetermined pulse amount to move the focus lens 7-2a (S122). After the focus lens 7-2a is moved, an exposure process is performed to acquire a video signal, and an AF evaluation value is calculated based on the video signal based on the video signal (S123). It i...

Embodiment 3

[0083] Next, another embodiment of the imaging method using the imaging device of the present invention will be described. In this embodiment, the smoothing differential processing is made variable according to the shooting mode designated by the mode dial SW2. The description of the parts overlapping with the above-mentioned Embodiments 1 and 2 will be omitted, and the different parts will be explained emphatically.

[0084] First, use Figure 15 The AF processing of this embodiment will be described with respect to the flowchart of FIG. Each operation step is marked in the form of S150, S151.... First, a process of setting a smooth differential range is performed according to the shooting mode at that time ( S150 ). After setting the smooth differential range, waiting processing is performed until the falling edge of the VD signal is detected (S151). After the falling edge of the VD signal is detected, the focus motor 7-2b is driven corresponding to the predetermined num...

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

The invention relates to am image picking-up apparatus with automatic focusing function and an image picking-up method, the automatic focusing function can focus with high-accuracy even for objects in low-brightness, low-contrast surroundings. The image picking-up apparatus comprises: an image picking-up element for receiving light from the objects across image picking-up lens; a lens moving apparatus for moving the image picking-up lens; an automatic focus tester for determining focal point according to image data acquired from the image picking-up element; wherein the automatic focus tester gains smooth differential operation result based on AF value calculated by using image data to determine the focal point position.

Description

technical field [0001] The present invention relates to an imaging device with an automatic focusing function for an object to be automatically focused and an imaging method thereof, and more particularly relates to an imaging device capable of maintaining high focus even for an object in a low brightness and low contrast environment. An imaging device and an imaging method for achieving precise focus. Background technique [0002] A typical imaging device such as a digital still camera is equipped with an auto focus (hereinafter referred to as AF) device for automatically focusing on a subject. As an example of an AF control method employed by an AF device, a mountain-climbing AF control method is known (for example, refer to Patent Document 1). The mountain-climbing AF control method adopts the method of calculating the integral value of the brightness difference between adjacent pixels from the image signal output from the imaging element, and using the integral value as...

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
Patent Type & Authority Applications(China)
IPC IPC(8): G03B13/36H04N5/225H04N5/232
Inventor 伊藤圭
Owner RICOH KK