Digital photographing apparatus and control method for evaluating validity of an auto-focus operation
AssigneeSamsung Electronics Co., Ltd.
InventorsKazuhiko Sugimoto, Jong-hoon Won
Life of this patent
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Abstract
A digital photographing apparatus includes an AF region setting unit for setting an AF region, a luminance detection area setting unit for setting a luminance detection area, a luminance calculation unit for calculating luminance values of the AF region and the luminance detection area, and a determination unit for calculating a luminance difference value that is a difference value between the luminance value of the AF region and the luminance value of the luminance detection area, and determining validity of an AF evaluation value with respect to the AF region according to the luminance difference value.
Claims25
A digital photographing apparatus comprising:
- an auto-focus (AF) region setting unit configured to set an AF region of a digital image;
- a luminance detection area setting unit configured to set a luminance detection area of the digital image, wherein the luminance detection area is separate from the AF region;
- a luminance calculation unit configured to calculate luminance values of a high frequency signal corresponding to the AF region and corresponding to the luminance detection area;
- and
- a determination unit configured to calculate a luminance difference value that is a difference between the luminance value of the AF region and the luminance value of the luminance detection area, and configured to determine validity of an AF evaluation value with respect to the AF region according to the luminance difference value.
A digital photographing apparatus for controlling a position of a focus lens according to a contrast peak value of an auto-focus (AF) region of a digital image, the digital photographing apparatus comprising:
- a luminance detection area setting unit configured to set a luminance detection area around the AF region, wherein the luminance detection area is separate from the AF region;
- a luminance calculation unit configured to calculate luminance values of a high frequency signal corresponding to the AF region and corresponding to the luminance detection area;
- and
- a determination unit configured to compare a first critical value with a luminance difference value between the luminance value of the AF region and the luminance value of the luminance detection area, and to set different critical values according to a result of the comparison, and to determine validity of the contrast peak value based on the set critical values.
A method of controlling a digital photographing apparatus, the method comprising:
- setting an AF region and a luminance detection area of a digital image, wherein the luminance detection area is separate from the AF region;
- calculating luminance values of a high frequency signal corresponding to the AF region and corresponding to the luminance detection area;
- calculating a luminance difference value that is a difference between the luminance value of the AF region and the luminance value of the luminance detection area;
- and
- determining validity of an AF evaluation value with respect to the AF region according to the luminance difference value.
Dependencies are inferred from the claim text.