公开(公告)号：US20190020885A1

公开(公告)日：2019-01-17

申请号：US16034888

申请日：2018-07-13

申请人： Hanwha Techwin Co., Ltd.

发明人： Young Seo PARK ,  Sang Won LEE ,  Yun Seok KWON

IPC分类号： H04N19/42 ,  H04N19/146 ,  H04N19/176

摘要： A method of adjusting a bitrate of an image based includes: identifying magnitudes of one or more frequency components in the image; determining a frequency filter based on a difference between a current bitrate and a target bitrate of the image such that the greater is the difference between the current bitrate and the target bitrate, magnitudes of the more high frequency components are reduced by the frequency filter; and applying the determined frequency filter to the magnitudes of the one or more frequency components.

公开(公告)号：US20180365816A1

公开(公告)日：2018-12-20

申请号：US16009133

申请日：2018-06-14

申请人： HANWHA TECHWIN CO., LTD.

发明人： Young Seo PARK ,  Sang Won LEE

IPC分类号： G06T5/00 ,  G06T5/50 ,  H04N19/124 ,  H04N5/235

CPC分类号： G06T5/007 ,  G06T5/50 ,  G06T2207/30232 ,  H04N5/23206 ,  H04N5/2351 ,  H04N5/243 ,  H04N19/124 ,  H04N19/14 ,  H04N19/146 ,  H04N19/172 ,  H04N19/85

摘要： A method of adjusting an output bitrate of an image by contrast adjustment includes: determining a maximum subtraction rate of a contrast of the image in response to a brightness of the image; comparing a current output bitrate of the image with a target bitrate while reducing the contrast of the image up to the determined maximum subtraction rate of the contrast of the image; and determining the contrast of the image to be the reduced contrast in response to determining that the reduced contrast of the image corresponds to the target bitrate.