Electronic device for compressing image based on compression loss data related to compression of multiple blocks, which are segments of the image, and method for operating the same

Patent metadata

Field	Value
Publication number	US-11032577-B2
Application number	US-201916282707-A
Country	US
Kind code	B2
Filing date	Feb 22, 2019
Priority date	Feb 23, 2018
Publication date	Jun 8, 2021
Grant date	Jun 8, 2021

Abstract

According to an embodiment, a method may include segmenting a first image into a first block and a second block, generating first compression loss data corresponding to the first block and second compression loss data corresponding to the second block, identifying a first compression property, segmenting a second image into a third block and a fourth block and compressing the second image, wherein the compressing includes compressing the third block according to the first compression property, generating third compression loss data corresponding to the third block, when a difference between the first compression loss data and the third compression loss data meets a first predetermined condition, compressing the fourth block according to the first compression property, and when the difference meets a second predetermined condition, compressing the fourth block according to a second compression property. Other various embodiments are possible as well.

First claim

What is claimed is:

1. An electronic device, comprising:
a processor;
an image sensor; and
a control circuit operatively connected with the image sensor and connected with the processor via a designated interface, the control circuit configured to:
obtain a first image and a second image subsequent to the first image using the image sensor,
segment the first image into a plurality of blocks including a first block and a second block and compress the first image, wherein in compressing the first image, the control circuit is further configured to generate first compression loss data corresponding to the first block and second compression loss data corresponding to the second block,
provide compressed data of the first image corresponding to the first block and the second block to the processor via the designated interface,
identify a first compression property based on the first compression loss data and the second compression loss data,
segment the second image into a plurality of blocks including a third block and a fourth block that respectively correspond to the first block and the second block and compress the second image, wherein in compressing the second image, the control circuit is further configured to:
compress the third block according to the first compression property,
generate third compression loss data corresponding to the third block,
when a difference between the first compression loss data and the third compression loss data meets a first predetermined condition, compress the fourth block according to the first compression property, and
when the difference between the first compression loss data and the third compression loss data meets a second predetermined condition, compress the fourth block according to a second compression property different from the first compression property, and

provide compressed data of the second image corresponding to the third block and the fourth block to the processor via the designated interface.

2. The electronic device of claim 1 , wherein the first compression property includes information on bits allocated to compress the first image and a compression loss data size ratio corresponding to the plurality of blocks of the first image, and wherein the control circuit is further configured to, as part of compressing the third block according to the first compression property, compress the third block according to bits allocated in proportion to the first compression loss data, and as part of compressing the fourth block according to the first compression property, compress the fourth block according to bits allocated in proportion to the second compression loss data.

3. The electronic device of claim 1 , wherein the second compression property includes information on bits evenly allocated to each of the plurality of blocks of the first image from bits allocated to compress the first image, and wherein the control circuit is further configured to, as part of compressing the fourth block according to the second compression property, compress the fourth block according to the bits evenly allocated.

4. The electronic device of claim 3 , wherein the second compression property includes bit count information resulting from adjusting the bits even allocated based on a compression loss data size ratio corresponding to the plurality of blocks of the first image, and wherein the control circuit is further configured to, as part of compressing the fourth block according to the second compression property, compress the fourth block according to the adjusted bits.

5. The electronic device of claim 1 , wherein the control circuit is further configured to:
receive sensing information related to the second image from the image sensor; and
as part of compressing the third block:
identify a difference between the first image and the second image based on the sensing information,
select one of the first compression property or the second compression property based on the difference meeting the first predetermined condition or the second predetermined condition, and
compress the third block according to the selected one of the first compression property or the second compression property.

6. The electronic device of claim 5 , wherein the sensing information includes at least one of a sensitivity (ISO) of the image sensor, an exposure time, a shutter speed, a motion, or image capture-related information.

7. The electronic device of claim 1 , wherein the control circuit is further configured to generate at least one of brightness information of the first block or edge information regarding edges included in the first block while compressing the first block, and wherein the first compression property reflects at least one of the brightness information of the first block or the edge information included in the first block.

8. The electronic device of claim 7 , wherein the first compression property includes information about bits allocated to compress the first image and bits allocated according to a brightness corresponding to each of the plurality of blocks of the first image.

9. The electronic device of claim 7 , wherein the first compression property includes information about bits allocated to compress the first image and bits allocated according to an edge count in each of the plurality of blocks of the first image.

10. A method for operating an electronic device, the method comprising:
obtaining a first image and a second image subsequent to the first image using an image sensor;
segmenting the first image into a plurality of blocks including a first block and a second block and compressing the first image, wherein the compressing of the first image includes generating first compression loss data corresponding to the first block and generating second compression loss data corresponding to the second block;
providing compressed data of the first image corresponding to the first block and the second block to a processor via a designated interface;
identifying a first compression property based on the first compression loss data and the second compression loss data;
segmenting the second image into a plurality of blocks including a third block and a fourth block that respectively correspond to the first block and the second block and compressing the second image, wherein the compressing of the second image includes:
compressing the third block according to the first compression property,
generating third compression loss data corresponding to the third block,
when a difference between the first compression loss data and the third compression loss data meets a first predetermined condition, compressing the fourth block according to the first compression property, and
when the difference between the first compression loss data and the third compression loss data meets a second predetermined condition, compressing the fourth block according to a second compression property different from the first compression property; and

providing compressed data of the second image corresponding to the third block and the fourth block to the processor via the designated interface.

11. The method of claim 10 , wherein the first compression property includes information on bits allocated to compress the first image and a compression loss data size ratio corresponding to the plurality of blocks of the first image, and wherein the method further comprises, as part of compressing the third block according to the first compression property, compressing the third block according to bits allocated in proportion to the first compression loss data, and as part of compressing the fourth block according to the first compression property, compressing the fourth bloc

Assignees

• Samsung Electronics Co Ltd

Inventors

• Chun Hyungju
• Kim Sungoh
• Kim Youngjo
• Park Hyunhee
• Lee Arang
• Choi Jongbum
• Han Changsu
• Park Hajoong
• Yeom Donghyun

Classifications

• H04N23/71

  Circuitry for evaluating the brightness variation · CPC title

• H04N19/136

  Incoming video signal characteristics or properties · CPC title

• H04N19/115 Primary

  Selection of the code volume for a coding unit prior to coding · CPC title

• H04N5/917 Primary

  for bandwidth reduction · CPC title

• H04N1/415

  in which the picture-elements are subdivided or grouped into fixed one-dimensional [1D] or two-dimensional [2D] blocks · CPC title