JP2004295361A5 - - Google Patents
Download PDFInfo
- Publication number
- JP2004295361A5 JP2004295361A5 JP2003085372A JP2003085372A JP2004295361A5 JP 2004295361 A5 JP2004295361 A5 JP 2004295361A5 JP 2003085372 A JP2003085372 A JP 2003085372A JP 2003085372 A JP2003085372 A JP 2003085372A JP 2004295361 A5 JP2004295361 A5 JP 2004295361A5
- Authority
- JP
- Japan
- Prior art keywords
- value
- image processing
- processing method
- replacement data
- pixel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Claims (25)
前記縮小画像より入力画素の位置に対応する所定サイズのウインドウ内の画素を抽出する工程と、
抽出したウインドウ内の画素に基づき、前記入力画素の値を置換する置換データを生成する工程と、
前記置換データと前記入力画素の値との差分値を求める工程と、
前記差分値を第１の閾値と比較する工程と、
前記差分値が前記第１の閾値未満の場合に前記入力画素の値を前記置換データで置換する工程とを有することを特徴とする画像処理方法。Reducing the input image at a predetermined magnification to obtain a reduced image;
Extracting a pixel in a window of a predetermined size corresponding to the position of the input pixel from the reduced image;
Generating replacement data that replaces the value of the input pixel based on the extracted pixels in the window;
Obtaining a difference value between the replacement data and the value of the input pixel;
Comparing the difference value with a first threshold;
And a step of replacing the value of the input pixel with the replacement data when the difference value is less than the first threshold value.
前記ウインドウ内の平均値を求める工程と、
前記入力画素が２つの領域の何れの領域かを判定する工程と、
判定された領域毎に代表値を求める工程と、
前記ウインドウ内の平均値及び２つの代表値と前記入力画素の値との差分値を各々求める工程とを有し、
求めた３つの差分値の内、差分値が最小となる差分値を選択して置換データとすることを特徴とする請求項１記載の画像処理方法。The step of generating the replacement data includes:
Obtaining an average value in the window;
Determining which of the two regions the input pixel is;
Obtaining a representative value for each determined area;
Each of obtaining an average value in the window and a difference value between two representative values and the value of the input pixel,
The image processing method according to claim 1, wherein, from among the obtained three difference values, a difference value that minimizes the difference value is selected as replacement data.
前記ウインドウ内の平均値を求める工程と、
前記ウインドウ内の各画素が２つの領域の何れの領域かを判定する工程と、
判定された領域毎に代表値を求める工程と、
求めた２つの領域代表値の差分を求める工程と、
前記２つの領域代表値の差分を第２の閾値と比較する工程とを有し、
前記２つの領域代表値の差分が前記第２の閾値以下の場合に前記ウインドウ内の平均値を置換データとすることを特徴とする請求項１記載の画像処理方法。The step of generating the replacement data includes:
Obtaining an average value in the window;
Determining which of the two regions each pixel in the window is;
Obtaining a representative value for each determined area;
Obtaining a difference between the obtained two region representative values;
Comparing the difference between the two region representative values with a second threshold,
2. The image processing method according to claim 1, wherein when the difference between the two area representative values is equal to or smaller than the second threshold value, an average value in the window is used as replacement data.
前記２つの領域代表値の平均と前記入力画素の値とを比較する工程と、
前記入力画素の値が前記２つの領域代表値の平均未満の場合に小さい方の領域代表値を選択し、前記入力画素の値が前記２つの領域代表値の平均以上の場合に大きい方の領域代表値を選択する工程とを更に有し、
前記２つの領域代表値の差分が前記第２の閾値を超える場合に前記選択された代表値を置換データとすることを特徴とする請求項３記載の画像処理方法。Obtaining an average of the two region representative values;
Comparing the average of the two region representative values with the value of the input pixel;
A smaller region representative value is selected when the value of the input pixel is less than the average of the two region representative values, and a larger region is selected when the value of the input pixel is greater than or equal to the average of the two region representative values. And selecting a representative value,
4. The image processing method according to claim 3, wherein when the difference between the two region representative values exceeds the second threshold, the selected representative value is used as replacement data.
前記ウインドウ内の各画素が２つの領域の何れの領域かを判定する工程と、
判定された領域毎に代表値を求める工程と、
乱数を生成する工程と、
前記乱数により２つの領域代表値の何れか１つを選択する工程とを有し、
選択した領域代表値を置換データとすることを特徴とする請求項１記載の画像処理方法。The step of generating the replacement data includes:
Determining which of the two regions each pixel in the window is;
Obtaining a representative value for each determined area;
Generating a random number;
Selecting any one of two region representative values by the random number,
2. The image processing method according to claim 1, wherein the selected region representative value is used as replacement data.
乱数を生成する工程と、
前記乱数により前記ウインドウ内の画素の１つを選択する工程と、
選択された画素の値を置換データとすることを特徴とする請求項１記載の画像処理方法。The step of generating the replacement data includes:
Generating a random number;
Selecting one of the pixels in the window by the random number;
2. The image processing method according to claim 1, wherein the value of the selected pixel is used as replacement data.
前記削減画像より入力画素の位置に対応する所定サイズのウインドウ内の画素を抽出する工程と、
抽出したウインドウ内の画素に基づき、前記入力画素の値を置換する複数の置換データを生成する工程と、
前記入力画素を複数のカテゴリに分類する工程と、
各カテゴリに従って前記複数の置換データの中から１つを選択する工程と、
選択された置換データと前記入力画素の値との差分値を求める工程と、
前記差分値を第１の閾値と比較する工程と、
前記差分値が前記第１の閾値未満の場合に前記入力画素の値を前記選択された置換データで置換する工程とを有することを特徴とする画像処理方法。Reducing the input image to a predetermined magnification to obtain a reduced image;
Extracting a pixel in a window of a predetermined size corresponding to the position of the input pixel from the reduced image;
Generating a plurality of replacement data for replacing values of the input pixels based on the extracted pixels in the window;
Classifying the input pixels into a plurality of categories;
Selecting one of the plurality of replacement data according to each category;
Obtaining a difference value between the selected replacement data and the value of the input pixel;
Comparing the difference value with a first threshold;
And a step of replacing the value of the input pixel with the selected replacement data when the difference value is less than the first threshold value.
前記縮小画像より入力画素の位置に対応する所定サイズのウインドウ内の画素を抽出する手段と、
抽出したウインドウ内の画素に基づき、前記入力画素の値を置換する置換データを生成する手段と、
前記置換データと前記入力画素の値との差分値を求める手段と、
前記差分値を第１の閾値と比較する手段と、
前記差分値が前記第１の閾値未満の場合に前記入力画素の値を前記置換データで置換する手段とを有することを特徴とする画像処理装置。Means for reducing the input image at a predetermined magnification to obtain a reduced image;
Means for extracting pixels in a window of a predetermined size corresponding to the position of the input pixel from the reduced image;
Means for generating replacement data for replacing the value of the input pixel based on the extracted pixels in the window;
Means for obtaining a difference value between the replacement data and the value of the input pixel;
Means for comparing the difference value with a first threshold;
An image processing apparatus comprising: means for replacing the value of the input pixel with the replacement data when the difference value is less than the first threshold value.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003085372A JP4040512B2 (en) | 2003-03-26 | 2003-03-26 | Image processing method and image processing apparatus |
| US10/809,526 US7432985B2 (en) | 2003-03-26 | 2004-03-26 | Image processing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003085372A JP4040512B2 (en) | 2003-03-26 | 2003-03-26 | Image processing method and image processing apparatus |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2004295361A JP2004295361A (en) | 2004-10-21 |
| JP2004295361A5 true JP2004295361A5 (en) | 2005-10-20 |
| JP4040512B2 JP4040512B2 (en) | 2008-01-30 |
Family
ID=33400311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003085372A Expired - Fee Related JP4040512B2 (en) | 2003-03-26 | 2003-03-26 | Image processing method and image processing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4040512B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4500521B2 (en) * | 2003-08-29 | 2010-07-14 | キヤノン株式会社 | Image processing apparatus, image processing method, computer program, and computer-readable recording medium |
| JP5493760B2 (en) * | 2009-01-19 | 2014-05-14 | 株式会社ニコン | Image processing apparatus and digital camera |
| US9619915B2 (en) | 2011-01-19 | 2017-04-11 | Adobe Systems Incorporated | Method and apparatus for converting an animated sequence of images into a document page |
| JP6822093B2 (en) * | 2016-11-21 | 2021-01-27 | 株式会社リコー | Image processing equipment, image processing system, image processing method, and image processing program |
| CN107424182B (en) * | 2017-05-03 | 2024-04-12 | 北京海顿中科技术有限公司 | Thermal imaging field monitoring device and method |
-
2003
- 2003-03-26 JP JP2003085372A patent/JP4040512B2/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zhang et al. | Rethinking noise synthesis and modeling in raw denoising | |
| Wang et al. | Image tampering detection based on stationary distribution of Markov chain | |
| CN102388402B (en) | Image processing apparatus and image processing method | |
| CN108921764B (en) | Image steganography method and system based on generation countermeasure network | |
| JP2004126648A5 (en) | ||
| US20180232888A1 (en) | Removal of background information from digital images | |
| US10021405B2 (en) | Encoding device, decoding device, and image processing device | |
| Hashim et al. | An extensive analysis and conduct comparative based on statistical attach of LSB substitution and LSB matching | |
| US9710722B1 (en) | System and method for adaptive pixel filtering | |
| CN114821449B (en) | License plate image processing method based on attention mechanism | |
| JP2010056690A5 (en) | ||
| EP3035209A1 (en) | Method and apparatus for deriving a perceptual hash value from an image | |
| JP2004295361A5 (en) | ||
| JP4687900B2 (en) | Image processing apparatus and program. | |
| JP2010056691A5 (en) | ||
| CN116977336A (en) | Camera defect detection method, device, computer equipment and storage medium | |
| JP2012222453A5 (en) | ||
| JP2013200298A (en) | Dispersion property evaluation method of island part in resin composition, and dispersion property evaluation device of island part in resin composition | |
| CN108021815B (en) | Image encryption method and device and electronic equipment | |
| JP5737387B2 (en) | Image processing device | |
| JP2007034719A (en) | Image processor and image processing method | |
| CN109886276B (en) | Half-word judging method for dial rolling digital character | |
| CN109389546B (en) | Multi-block reversible watermark embedding method and device and watermark extracting method and device | |
| CN109727232B (en) | Method and apparatus for detecting dot area ratio of printing plate | |
| JP2005184404A5 (en) |