PRIOR IMAGE JPEG-COMPRESSION DETECTION
The paper presents two methods of prior JPEG-compression detection.In the first method the histogram of chrominance is analysed. In JPEG-compressed images the histogram contains significantly more local maxima than in uncompressed files. The second method is based on neighbouring pixel O value diff...
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| Format: | Article |
| Language: | English |
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Polish Association for Knowledge Promotion
2016-09-01
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| Series: | Applied Computer Science |
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| Online Access: | http://acs.pollub.pl/pdf/v12n3/2.pdf |
| Summary: | The paper presents two methods of prior JPEG-compression detection.In the first method the histogram of chrominance is analysed. In JPEG-compressed images the histogram contains significantly more local maxima than in uncompressed files. The second method is based on neighbouring pixel O value difference. In JPEG-compressed image the distribution of these values is different than the distribution counted on the edges of compression 8x8 blocks. These differences are summed up to create a classifier that allows to assess if the image was compressed. |
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| ISSN: | 1895-3735 2353-6977 |