Method, apparatus and storage medium for estimating the data volume of a digital book

Patent metadata

Field	Value
Publication number	US-2017339293-A1
Application number	US-201715446217-A
Country	US
Kind code	A1
Filing date	Mar 1, 2017
Priority date	May 20, 2016
Publication date	Nov 23, 2017
Grant date	—

Abstract

A processor randomly selects a page image group corresponding to a predetermined number of pages, such as five pages, from scan images of all the pages of a book, and clips a predetermined area (evaluation area) from each of the selected page images. Subsequently, the processor performs, on each clipped image, color correction and compression at a compression rate in accordance with an image quality specified via a user interface, and derives the data volume of each clipped image subjected to the processing. In addition, based on the data volumes of the clipped images subjected to the processing, the processor derives estimated one page data volumes Then, by using the estimated one page data volumes, the processor derives an estimated data volume of a digital book corresponding to the total pages of the book.

First claim

What is claimed is:

1 . A method for estimating a data volume of a digital book, comprising:
clipping an evaluation image from a page image; performing book digitization on the evaluation image; and estimating a data volume of a digital book corresponding to the page image, based on a data volume of the evaluation image subjected to the book digitization.

2 . The method according to claim 1 further comprising:
selecting a predetermined number of page images from a plurality of page images;
deriving a data volume per page image from data volumes of evaluation images respectively clipped from the predetermined number of page images and then subjected to book digitization; and
estimating a data volume of a digital book corresponding to the plurality of page images based on the data volume per page image.

3 . The method according to claim 1 , wherein the evaluation image is an image clipped from a center area of the page image.

4 . The method according to claim 1 , wherein the evaluation image has a size determined based on a difference between an estimated data volume of a digital book acquired in past and an actual data volume of the digital book.

5 . The method according to claim 1 , wherein the evaluation image has a size determined based on an area ratio between a character area and a background area constituting the page image.

6 . The method according to claim 1 , wherein the evaluation image has an area equal to 10 to 40 percent of the page image.

7 . The method according to claim 1 , wherein the book digitization includes:
performing image conversion on a target image based on a conversion parameter; and compressing the converted image at a predetermined compression ratio.

8 . The method according to claim 7 , wherein the conversion parameter is a color correction parameter set on the page image in advance.

9 . The method according to claim 7 , wherein the compression ratio is specified via a user interface.

10 . The method according to claim 1 , wherein the estimation of the data volume of the digital book corresponding to the page image is performed based on an image size of the digital book corresponding to the page image and a data volume per pixel of the evaluation image subjected to the book digitization.

11 . The method according to claim 10 , wherein the image size is specified via a user interface.

12 . An apparatus for estimating a data volume of a digital book, comprising:
a clipper which clips an evaluation image from a page image; a book digitizer which performs book digitization on the evaluation image clipped by the clipper; and an estimator which estimates a data volume of a digital book corresponding to the page image, based on a data volume of the evaluation image subjected to the book digitization by the book digitizer.

13 . The apparatus according to claim 12 , comprising:
a processor which functions as the clipper, the book digitizer, and the estimator.

14 . A non-transitory computer-readable storage medium having stored thereon a program that is executable by a computer to actualize functions comprising:
clipping an evaluation image from a page image; performing book digitization on the evaluation image; and estimating a data volume of a digital book corresponding to the page image, based on a data volume of the evaluation image subjected to the book digitization.

Assignees

• Casio Computer Co Ltd

Inventors

• Nimura Ryo

Classifications

• G06F18/2193 Primary

  based on specific statistical tests · CPC title

• G06V10/22

  by selection of a specific region containing or referencing a pattern; Locating or processing of specific regions to guide the detection or recognition · CPC title

• G06V30/40

  Document-oriented image-based pattern recognition · CPC title

• H04N1/00726

  Other properties of the sheet, e.g. curvature or reflectivity · CPC title

• H04N1/0044

  for image preview or review, e.g. to help the user position a sheet · CPC title