JP2016039614A5 - - Google Patents
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- JP2016039614A5 JP2016039614A5 JP2014163929A JP2014163929A JP2016039614A5 JP 2016039614 A5 JP2016039614 A5 JP 2016039614A5 JP 2014163929 A JP2014163929 A JP 2014163929A JP 2014163929 A JP2014163929 A JP 2014163929A JP 2016039614 A5 JP2016039614 A5 JP 2016039614A5
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Description
上記目的を達成するために、本発明の画像処理装置は、入力した画像を、予め決められた条件に従って複数の被写体領域に分割する分割手段と、前記分割した各被写体領域の輝度の分布に基づいて、前記画像の輝度を複数の輝度領域に分割し、前記複数の被写体領域のうち、前記分割した各輝度領域に対応する１つの被写体領域の代表輝度値に基づいて、前記輝度領域ごとに第１のゲインを算出する算出手段と、前記複数の被写体領域のうち、前記輝度領域ごとに、対応する前記１つの被写体領域の輝度の分布と、当該輝度領域以外の少なくとも１つの輝度領域に対応する少なくとも１つの別の被写体領域の輝度の分布とに基づいて、前記第１のゲインを補正して、前記輝度領域ごとに第２のゲインを求める補正手段と、前記第２のゲインを用いて、前記画像の輝度を変換する変換手段とを有する。 In order to achieve the above object, an image processing apparatus according to the present invention is based on a dividing unit that divides an input image into a plurality of subject areas according to a predetermined condition, and a luminance distribution of each of the divided subject areas. Then, the luminance of the image is divided into a plurality of luminance areas, and each of the luminance areas is determined based on a representative luminance value of one subject area corresponding to each of the divided luminance areas. calculating means for calculating a first gain, among the plurality of object regions, each front Kiteru level area, the distribution of the luminance of the corresponding one of the subject region, at least one luminance area other than the luminance area Correction means for correcting the first gain based on the corresponding luminance distribution of at least one other subject area to obtain a second gain for each of the luminance areas; and There are, and a converting means for converting the luminance of the image.
Claims (14)
前記分割した各被写体領域の輝度の分布に基づいて、前記画像の輝度を複数の輝度領域に分割し、前記複数の被写体領域のうち、前記分割した各輝度領域に対応する１つの被写体領域の代表輝度値に基づいて、前記輝度領域ごとに第１のゲインを算出する算出手段と、
前記複数の被写体領域のうち、前記輝度領域ごとに、対応する前記１つの被写体領域の輝度の分布と、当該輝度領域以外の少なくとも１つの輝度領域に対応する少なくとも１つの別の被写体領域の輝度の分布とに基づいて、前記第１のゲインを補正して、前記輝度領域ごとに第２のゲインを求める補正手段と、
前記第２のゲインを用いて、前記画像の輝度を変換する変換手段と
を有することを特徴とする画像処理装置。 Dividing means for dividing the input image into a plurality of subject areas according to a predetermined condition;
Based on the luminance distribution of each of the divided subject areas, the luminance of the image is divided into a plurality of luminance areas, and a representative of one subject area corresponding to each of the divided luminance areas among the plurality of subject areas. Calculating means for calculating a first gain for each of the luminance regions based on a luminance value;
Among the plurality of object regions, before each Kiteru level area, the distribution of the luminance of the corresponding one of the subject region, at least one further object area corresponding to at least one luminance area other than the luminance area Correction means for correcting the first gain based on the luminance distribution and obtaining a second gain for each of the luminance regions;
An image processing apparatus comprising: conversion means for converting the luminance of the image using the second gain.
前記補正手段は、前記別の被写体領域に含まれる画像信号のうち、前記低輝度領域の輝度を有する画像信号の割合に基づいて、前記第１のゲインを補正し、
前記割合が予め決められた閾値よりも高い場合に、該閾値以下の場合よりも前記第１のゲインを小さくすることを特徴とする請求項１または２に記載の画像処理装置。 The plurality of luminance regions include a low luminance region corresponding to a subject region having the lowest representative luminance value among the plurality of subject regions,
The correction means corrects the first gain based on a ratio of an image signal having a luminance of the low luminance region among image signals included in the different subject region,
The image processing apparatus according to claim 1, wherein when the ratio is higher than a predetermined threshold, the first gain is made smaller than when the ratio is equal to or lower than the threshold.
前記差が予め決められた閾値よりも大きい場合に、該閾値以下の場合よりも、前記第２のゲインの下限を小さくすることをすることを特徴とする請求項３に記載の画像処理装置。 The correction means further corrects the first gain based on a difference between a luminance of the one subject region corresponding to the low luminance region and a luminance of the other subject region,
The image processing apparatus according to claim 3, wherein when the difference is larger than a predetermined threshold value, the lower limit of the second gain is made smaller than when the difference is equal to or smaller than the threshold value.
前記補正手段は、前記別の被写体領域に含まれる画像信号のうち、前記高輝度領域の輝度を有する画像信号の割合に基づいて、前記第１のゲインを補正し、
前記割合が予め決められた閾値よりも高い場合に、該閾値以下の場合よりも前記第１のゲインを大きくすることを特徴とする請求項１乃至４のいずれか１項に記載の画像処理装置。 The plurality of luminance regions include a high luminance region corresponding to a subject region having the highest representative luminance value among the plurality of subject regions,
The correction means corrects the first gain based on a ratio of an image signal having the luminance of the high-luminance region among image signals included in the different subject region,
5. The image processing apparatus according to claim 1, wherein when the ratio is higher than a predetermined threshold value, the first gain is made larger than when the ratio is equal to or lower than the threshold value. .
前記差が予め決められた閾値よりも大きい場合に、該閾値以下の場合よりも、前記第２のゲインの上限を大きくすることをすることを特徴とする請求項５に記載の画像処理装置。 The correction means further corrects the first gain based on a difference between a luminance of the one subject region corresponding to the high luminance region and a luminance of the another subject region,
The image processing apparatus according to claim 5, wherein when the difference is larger than a predetermined threshold, the upper limit of the second gain is set larger than when the difference is equal to or smaller than the threshold.
前記被写体領域ごとに、該被写体領域の明るさを所定の明るさに変換する第１のゲインを算出する算出手段と、
前記分割した各被写体領域の輝度の分布に基づいて、前記画像の輝度を複数の輝度領域に分割し、前記複数の輝度領域それぞれと前記複数の被写体領域のいずれかを対応づけ、前記輝度領域ごとに、対応づけられた前記被写体領域の前記第１のゲインを、該被写体領域の輝度の分布と、当該輝度領域以外の少なくとも１つの輝度領域に対応づけられた前記被写体領域の輝度の分布とに基づいて補正し、前記輝度領域ごとに第２のゲインを求める補正手段と、
前記第２のゲインを用いて、前記画像の輝度を変換する変換手段と
を有することを特徴とする画像処理装置。 Dividing means for dividing the input image into a plurality of subject areas according to a predetermined condition;
Calculating means for calculating a first gain for converting the brightness of the subject area to a predetermined brightness for each subject area;
Based on the distribution of luminance of each subject area that the divided, the divided image brightness into a plurality of luminance areas, correspondence to one of said plurality of luminance areas and each of the plurality of object regions, before Kiteru degree for each region, the first gain in correspondence was the object region, the distribution of the brightness of the subject region, the distribution of the brightness of the subject region associated with the at least one luminance area other than the luminance area Correction means for correcting the second gain for each of the luminance regions;
An image processing apparatus comprising: conversion means for converting the luminance of the image using the second gain.
算出手段が、前記分割した各被写体領域の輝度の分布に基づいて、前記画像の輝度を複数の輝度領域に分割する分割工程と、
前記算出手段が、前記複数の被写体領域のうち、前記分割した各輝度領域に対応する１つの被写体領域の代表輝度値に基づいて、前記輝度領域ごとに第１のゲインを算出する算出工程と、
補正手段が、前記複数の被写体領域のうち、前記輝度領域ごとに、対応する前記１つの被写体領域の輝度の分布と、当該輝度領域以外の少なくとも１つの輝度領域に対応する少なくとも１つの別の被写体領域の輝度の分布とに基づいて、前記第１のゲインを補正して、前記輝度領域ごとに第２のゲインを求める補正工程と、
変換手段が、前記第２のゲインを用いて、前記画像の輝度を変換する変換工程と
を有することを特徴とする画像処理方法。 A dividing step in which the dividing means divides the input image into a plurality of subject areas according to a predetermined condition;
A dividing step of dividing the luminance of the image into a plurality of luminance areas based on a luminance distribution of each of the divided subject areas;
A calculating step in which the calculation means calculates a first gain for each of the luminance regions based on a representative luminance value of one subject region corresponding to each of the divided luminance regions among the plurality of subject regions;
Correcting means, among the plurality of object regions, before each Kiteru level area, the distribution of the luminance of the corresponding one of the subject region, at least one further corresponding to at least one luminance area other than the luminance area A correction step of correcting the first gain based on the luminance distribution of the subject area and obtaining a second gain for each of the luminance areas;
An image processing method, comprising: a conversion step in which conversion means converts the luminance of the image using the second gain.
算出手段が、前記被写体領域ごとに、該被写体領域の明るさを所定の明るさに変換する第１のゲインを算出する算出工程と、
補正手段が、前記分割した各被写体領域の輝度の分布に基づいて、前記画像の輝度を複数の輝度領域に分割する分割工程と、
前記補正手段が、前記複数の輝度領域それぞれと前記複数の被写体領域のいずれかを対応づける対応づけ工程と、
前記補正手段が、前記輝度領域ごとに、対応づけられた前記被写体領域の前記第１のゲインを、該被写体領域の輝度の分布と、当該輝度領域以外の少なくとも１つの輝度領域に対応づけられた前記被写体領域の輝度の分布とに基づいて補正し、前記輝度領域ごとに第２のゲインを求める補正工程と、
変換手段が、前記第２のゲインを用いて、前記画像の輝度を変換する変換工程と
を有することを特徴とする画像処理方法。 A dividing step in which the dividing means divides the input image into a plurality of subject areas according to a predetermined condition;
A calculating step for calculating, for each subject area, a first gain for converting the brightness of the subject area to a predetermined brightness;
A dividing step in which the correcting unit divides the luminance of the image into a plurality of luminance regions based on the luminance distribution of each of the divided subject regions;
An association step in which the correcting means associates each of the plurality of luminance regions with any of the plurality of subject regions;
Said correction means, before each Kiteru level area, correspondence to the first gain of the correspondence was the object region, the distribution of the brightness of the subject region, at least one luminance area other than the luminance area Correcting based on the luminance distribution of the subject area obtained, and obtaining a second gain for each luminance area;
An image processing method, comprising: a conversion step in which conversion means converts the luminance of the image using the second gain.
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| JP2014163929A JP6397261B2 (en) | 2014-08-11 | 2014-08-11 | Image processing apparatus and method |
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| JP2014163929A JP6397261B2 (en) | 2014-08-11 | 2014-08-11 | Image processing apparatus and method |
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| JP2016039614A JP2016039614A (en) | 2016-03-22 |
| JP2016039614A5 true JP2016039614A5 (en) | 2017-09-21 |
| JP6397261B2 JP6397261B2 (en) | 2018-09-26 |
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