Image pickup apparatus and image processing method
First Claim
Patent Images
1. An image combination method, comprising the steps of:
- image-combining high output and low output image data by an image combining unit to form combined image data;
multiplying the combined data of the high output image data and the low output image data by a total gain that depends on a scene;
wherein the total gain is multiplied on the combined data of the high output image data and the low output image data in a range that the high output image data exceeds a certain value; and
wherein the range that the high output image data exceeds a certain value is range that p>
α
−
k×
(H/th), where p denotes the total gain, α
denotes an arbitrary numeral, k denotes a coefficient, H denotes the high output image data after a gamma correction, and th denotes the threshold value.
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Abstract
An image combined high sensitivity image and low sensitivity image is provided with well-adjusted white balance and broad dynamic range. The image is obtained by multiplying the combined data by total gain that depends on scene. A white balance is adjusted with gain value calculated from of high output image data. Lv value representing luminance is calculated and compared with a threshold to decide whether or not the high sensitivity image and the low sensitivity image should be combined. First gamma correction unit performs gamma-correction for the image signal derived from the high sensitivity signal with first gamma character, second gamma correction unit performs gamma-correction for the image signal derived from the low sensitivity signal with second gamma character that is different from the first gamma character, and addition unit combines the image signal from the first gamma correction unit and the image signal from the second gamma correction unit.
40 Citations
18 Claims
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1. An image combination method, comprising the steps of:
- image-combining high output and low output image data by an image combining unit to form combined image data;
multiplying the combined data of the high output image data and the low output image data by a total gain that depends on a scene;
wherein the total gain is multiplied on the combined data of the high output image data and the low output image data in a range that the high output image data exceeds a certain value; and
wherein the range that the high output image data exceeds a certain value is range that p>
α
−
k×
(H/th), where p denotes the total gain, α
denotes an arbitrary numeral, k denotes a coefficient, H denotes the high output image data after a gamma correction, and th denotes the threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- image-combining high output and low output image data by an image combining unit to form combined image data;
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9. An image pickup apparatus, comprising:
- an image-combining unit that image-combines high output image data and low output image data to form combined data; and
a multiplying means that multiplies the combined data of the high output image data and the low output image data by a total gain that depends on a scene;
wherein the multiplying means multiplies the combined data of the high output image data and the low output image data by the total gain in a range that the high output image data exceeds a certain value; and
wherein the range that the high output image data exceeds a certain value is range that p>
α
−
k×
(H/th), wherein p denotes the total gain, α
denotes an arbitrary numeral, k denotes a coefficient, H denotes the high output image data after a gamma correction, and th denotes the threshold value. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
- an image-combining unit that image-combines high output image data and low output image data to form combined data; and
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17. An image combination method comprising:
- combining high output image data and low output image data using an image combining unit by the following formula to form combined image data
d=[H+MIN(H/th,1)×
L]×
MAX[(−
k×
H/th)+α
,p]where d denotes the combined image data, p denotes the total gain, a denotes an arbitrary numeral, k denotes a coefficient, H denotes the high output image data after gamma correction, and L denotes the low output image data after gamma correction, th denotes a threshold value, wherein the total gain for controlling a dynamic range is experimentally determined for each scene in advance.
- combining high output image data and low output image data using an image combining unit by the following formula to form combined image data
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18. An image pickup apparatus comprising:
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an image combining unit that combines high output image data and low output image data by the following formula to form combined image data
d=[H+MIN(H/th,1)×
L]×
MAX[(−
k×
H/th)+α
, p]where d denotes the combined image data, p denotes the total gain, α
denotes an arbitrary numeral,k denotes a coefficient, H denotes the high output image data after gamma correction, and L denotes the low output image data after gamma correction, th denotes a threshold value, wherein the total gain for controlling a dynamic range is experimentally determined for each scene in advance.
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Specification
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Current AssigneeFujifilm Corporation (Fujifilm Holdings Corporation)
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Original AssigneeFujifilm Corporation (Fujifilm Holdings Corporation)
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InventorsKobayashi, Hirokazu, Hyodo, Manabu, Sugimoto, Masahiko, Ichikawa, Koji, Tamaru, Masaya, Sakamoto, Koichi, Takemura, Kazuhiko
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Primary Examiner(s)Tran; Sinh N
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Assistant Examiner(s)Daniels; Anthony J
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Application NumberUS10/601,654Publication NumberTime in Patent Office2,100 DaysField of Search348/229.1, 348/255, 348/362, 348/222.1US Class Current348/229.1CPC Class CodesH04N 23/70 Circuitry for compensating ...H04N 23/741 by increasing the dynamic r...H04N 23/88 for colour balance, e.g. wh...H04N 5/202 Gamma control circuits for ...H04N 9/69 for modifying the colour si...
