Image pickup apparatus having an interpolation function

Details Image pickup apparatus having an interpolation function Image pickup apparatus having an interpolation function

1997-11-13

2001-09-25

Ho, Tuan (Department: 2612)

Television

Camera, system and detail

Combined image signal generator and general image signal...

C348S273000

Reexamination Certificate

active

06295087

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
Present invention relates to a signal processing apparatus for increasing a resolution of a pickup image data by way of interpolation.
2. Description of the Related Art
Conventionally, there is known a single-plate type video camera using a single color CCD, However, as shown in
FIG. 1
, aliasing is caused in the CCD output of the G-checker R/B line sequential method.
There are also known two-plate type and three-plate type video cameras using two and three CCD. However, use of a plurality of CCD costs much and requires a complicated configuration of the apparatus.
There is also known a technique to obtain a high resolution by wobbling the CCD position by a bimorph or the like so as to combine a plurality of frame images obtained at different positions. However, this method also has a problem that the method is too much complicated.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a signal processing apparatus enabling to obtain an image of a high resolution by way of interpolation of an image data picked-up.
The present invention provides an image pickup apparatus comprising: an image pickup element having a plurality of pixels arranged in a matrix state, each pixel outputting a sample information according to a light received; correlation value detecting means based on sample information from a plurality of pixels positioned in the vicinity of a reference sample within a frame composed by the sample information outputted from the respective pixels of the image pickup element, for detecting a correlation value of a plurality of sample information in a horizontal direction, a correlation value of a plurality of sample information in a vertical direction, and a correlation value of a plurality of sample information in a diagonal direction; and interpolation means based on the sample information of the pixels positioned in the direction having the greatest correlation value detected by the correlation value detecting means, for executing an interpolation for the reference sample position.
According to another aspect of the present invention, there is also provided a signal processing apparatus for executing an interpolation based on a reference sample position within a frame composed by sample information outputted from a plurality of pixels arranged in a matrix state and provided in an image pickup element which outputs sample information according to a light quantity received by each of the pixels, the interpolation being executed according to sample information of pixels around the reference sample position, the apparatus comprising: correlation value detecting means for detecting a correlation value of a plurality of sample information in the vertical direction, a correlation value of a plurality of sample information in the horizontal direction, and a correlation value of a plurality of sample information in the diagonal directions according to sample information of a plurality of pixels position in the vicinity of the reference sample position; and interpolation means for executing an interpolation for the reference sample position according to sample information of pixels positioned in a direction having the greatest correlation value detected by the correlation value detecting means.
According to still another aspect of the present invention there is provided an interpolation method for executing an interpolation according to sample information from a plurality of pixels positioned in the vicinity of a reference sample position within a frame composed by sample information outputted from an image pickup element having a plurality of pixels arranged in a matrix state, each pixel outputting a sample information according a received light quantity, wherein
by detecting for the reference sample position a correlation value of a plurality of sample information in a vertical direction, a correlation value of a plurality of sample information in a horizontal direction, and a correlation value of a plurality of sample information in a diagonal direction, according to sample information from a plurality of pixels positioned in the vicinity of the reference sample position,
the interpolation is executed for the reference sample position according to a sample information of pixels positioned in a direction having the greatest correlation value detected.


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