Carles Mitjà | Universitat Politecnica de Catalunya (original) (raw)

Papers by Carles Mitjà

Research paper thumbnail of Medida de la calidad en la digitalización de colecciones fotográficas

Docuimagen 2005 Ponencias De Las Jornadas Online 13 Al 19 De Diciembre De 2005 2005, 2005

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Research paper thumbnail of <title>Measuring image quality performance on image versions saved with different file format and compression ratio</title>

Optics, Photonics, and Digital Technologies for Multimedia Applications II, 2012

ABSTRACT

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Research paper thumbnail of Optimization of digitization procedures in cultural heritage preservation

8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 2013

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Research paper thumbnail of <title>Relationships between lens performance and different sensor sizes in professional photographic still SLR cameras</title>

Current Developments in Lens Design and Optical Engineering X, 2009

Current photographic still cameras, in the professional SLR step, are available in two basic sens... more Current photographic still cameras, in the professional SLR step, are available in two basic sensor sizes, 16x24mm and 24x36mm and both of them can be used with the same or similar range of focal length lenses. Lens aperture determines resolving power and diffraction effects and indeed, MTF function. In order to preserve an acceptable image quality level, it must be

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Research paper thumbnail of <title>LCD displays performance comparison by MTF measurement using the white noise stimulus method</title>

Image Quality and System Performance VIII, 2011

The amount of images produced to be viewed as soft copies on output displays are significantly in... more The amount of images produced to be viewed as soft copies on output displays are significantly increasing. This growing occurs at the expense of the images targeted to hard copy versions on paper or any other physical support. Even in the case of high quality hard copy production, people working in professional imaging uses different displays in selecting, editing, processing

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Research paper thumbnail of Measuring image quality in overlapping areas of panoramic composed images

SPIE Proceedings, 2012

... Author(s): Carles Mitjà; Toni Bover; Jaume Escofet. Date: 30 April 2012. GOOD NEWS! ... 8436.... more ... Author(s): Carles Mitjà; Toni Bover; Jaume Escofet. Date: 30 April 2012. GOOD NEWS! ... 8436. Optics, Photonics, and Digital Technologies for Multimedia Applications II, Peter Schelkens; Touradj Ebrahimi; Gabriel Cristóbal; Frédéric Truchetet; Pasi Saarikko, Editors, 843605. ...

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Research paper thumbnail of Image Improvement in Pinhole Digital Photography by Means of Inverse and Wienner Filtering

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Research paper thumbnail of Matching rendered and real world images by digital image processing

Optics, Photonics, and Digital Technologies for Multimedia Applications, 2010

... s): Carles Mitjà; Toni Bover; Miquel Bigas; Jaume Escofet. PDF: Member: 18.00,Non−member:18.00, Non-member: 18.00,Non−member:... more ... s): Carles Mitjà; Toni Bover; Miquel Bigas; Jaume Escofet. PDF: Member: 18.00,Non−member:18.00, Non-member: 18.00,Non−member:18.00 Hard Copy: Member: 24.00,Non−member:24.00, Non-member: 24.00,Non−member:24.00, Proceedings Vol. 7723. Optics, Photonics, and Digital Technologies for Multimedia Applications, Peter Schelkens; Touradj ...

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Research paper thumbnail of View-through characterization of translucent fabrics based on opto-digital image analysis

Proceedings of SPIE, 2012

... Author(s): Jaume Escofet; Carles Mitjà; Miquel Ralló; Maria S. Millán. Date: 1 May 2012. ... ... more ... Author(s): Jaume Escofet; Carles Mitjà; Miquel Ralló; Maria S. Millán. Date: 1 May 2012. ... 8436. Optics, Photonics, and Digital Technologies for Multimedia Applications II, Peter Schelkens; Touradj Ebrahimi; Gabriel Cristóbal; Frédéric Truchetet; Pasi Saarikko, Editors, 843616. ...

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Research paper thumbnail of Digital image quality measurements by objective and subjective methods from series of parametrically degraded images

8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 2013

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Research paper thumbnail of Digital image quality measurements by objective and subjective methods from series of parametrically degraded images

8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 2013

ABSTRACT Many digital image applications like digitization of cultural heritage for preservation ... more ABSTRACT Many digital image applications like digitization of cultural heritage for preservation purposes operate with compressed files in one or more image observing steps. For this kind of applications JPEG compression is one of the most widely used. Compression level, final file size and quality loss are parameters that must be managed optimally. Although this loss can be monitored by means of objective image quality measurements, the real challenge is to know how it can be related with the perceived image quality by observers. A pictorial image has been degraded by two different procedures. The first, applying different levels of low pass filtering by convolving the image with progressively broad Gauss kernels. The second, saving the original file to a series of JPEG compression levels. In both cases, the objective image quality measurement is done by analysis of the image power spectrum. In order to obtain a measure of the perceived image quality, both series of degraded images are displayed on a computer screen organized in random pairs. The observers are compelled to choose the best image of each pair. Finally, a ranking is established applying Thurstone scaling method. Results obtained by both measurements are compared between them and with other objective measurement method as the Slanted Edge Test.

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Research paper thumbnail of <title>Matching rendered and real world images by digital image processing</title>

Optics, Photonics, and Digital Technologies for Multimedia Applications, 2010

Recent advances in computer-generated images (CGI) have been used in commercial and industrial ph... more Recent advances in computer-generated images (CGI) have been used in commercial and industrial photography providing a broad scope in product advertising. Mixing real world images with those rendered from virtual space software shows a more or less visible mismatching between corresponding image quality performance. Rendered images are produced by software which quality performance is only limited by the resolution output.

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Research paper thumbnail of <title>LCD displays performance comparison by MTF measurement using the white noise stimulus method</title>

Image Quality and System Performance VIII, 2011

The amount of images produced to be viewed as soft copies on output displays are significantly in... more The amount of images produced to be viewed as soft copies on output displays are significantly increasing. This growing occurs at the expense of the images targeted to hard copy versions on paper or any other physical support. Even in the case of high quality hard copy production, people working in professional imaging uses different displays in selecting, editing, processing

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Research paper thumbnail of IMAGE IMPROVEMENT IN PINHOLE DIGITAL PHOTOGRAPHY BY MEANS OF INVERSE AND WIENNER FILTERING

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Research paper thumbnail of <title>Relationships between lens performance and different sensor sizes in professional photographic still SLR cameras</title>

Current Developments in Lens Design and Optical Engineering X, 2009

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Research paper thumbnail of Optimization of digitization procedures in cultural heritage preservation

8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 2013

ABSTRACT

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Research paper thumbnail of Measuring image quality performance on image versions saved with different file format and compression ratio

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Measuring image quality in overlapping areas of panoramic composed images

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Research paper thumbnail of Medida de la calidad de imagen en versiones guardadas con diferente formato de archivo y relación de compresión

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Research paper thumbnail of Calibrado de Estereotest Mediante Correlación de Imágenes Digitales (Poster)

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Research paper thumbnail of Medida de la calidad en la digitalización de colecciones fotográficas

Docuimagen 2005 Ponencias De Las Jornadas Online 13 Al 19 De Diciembre De 2005 2005, 2005

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Research paper thumbnail of <title>Measuring image quality performance on image versions saved with different file format and compression ratio</title>

Optics, Photonics, and Digital Technologies for Multimedia Applications II, 2012

ABSTRACT

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Research paper thumbnail of Optimization of digitization procedures in cultural heritage preservation

8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 2013

Bookmarks Related papers MentionsView impact

Research paper thumbnail of <title>Relationships between lens performance and different sensor sizes in professional photographic still SLR cameras</title>

Current Developments in Lens Design and Optical Engineering X, 2009

Current photographic still cameras, in the professional SLR step, are available in two basic sens... more Current photographic still cameras, in the professional SLR step, are available in two basic sensor sizes, 16x24mm and 24x36mm and both of them can be used with the same or similar range of focal length lenses. Lens aperture determines resolving power and diffraction effects and indeed, MTF function. In order to preserve an acceptable image quality level, it must be

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Research paper thumbnail of <title>LCD displays performance comparison by MTF measurement using the white noise stimulus method</title>

Image Quality and System Performance VIII, 2011

The amount of images produced to be viewed as soft copies on output displays are significantly in... more The amount of images produced to be viewed as soft copies on output displays are significantly increasing. This growing occurs at the expense of the images targeted to hard copy versions on paper or any other physical support. Even in the case of high quality hard copy production, people working in professional imaging uses different displays in selecting, editing, processing

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Research paper thumbnail of Measuring image quality in overlapping areas of panoramic composed images

SPIE Proceedings, 2012

... Author(s): Carles Mitjà; Toni Bover; Jaume Escofet. Date: 30 April 2012. GOOD NEWS! ... 8436.... more ... Author(s): Carles Mitjà; Toni Bover; Jaume Escofet. Date: 30 April 2012. GOOD NEWS! ... 8436. Optics, Photonics, and Digital Technologies for Multimedia Applications II, Peter Schelkens; Touradj Ebrahimi; Gabriel Cristóbal; Frédéric Truchetet; Pasi Saarikko, Editors, 843605. ...

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Research paper thumbnail of Image Improvement in Pinhole Digital Photography by Means of Inverse and Wienner Filtering

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Matching rendered and real world images by digital image processing

Optics, Photonics, and Digital Technologies for Multimedia Applications, 2010

... s): Carles Mitjà; Toni Bover; Miquel Bigas; Jaume Escofet. PDF: Member: 18.00,Non−member:18.00, Non-member: 18.00,Non−member:... more ... s): Carles Mitjà; Toni Bover; Miquel Bigas; Jaume Escofet. PDF: Member: 18.00,Non−member:18.00, Non-member: 18.00,Non−member:18.00 Hard Copy: Member: 24.00,Non−member:24.00, Non-member: 24.00,Non−member:24.00, Proceedings Vol. 7723. Optics, Photonics, and Digital Technologies for Multimedia Applications, Peter Schelkens; Touradj ...

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Research paper thumbnail of View-through characterization of translucent fabrics based on opto-digital image analysis

Proceedings of SPIE, 2012

... Author(s): Jaume Escofet; Carles Mitjà; Miquel Ralló; Maria S. Millán. Date: 1 May 2012. ... ... more ... Author(s): Jaume Escofet; Carles Mitjà; Miquel Ralló; Maria S. Millán. Date: 1 May 2012. ... 8436. Optics, Photonics, and Digital Technologies for Multimedia Applications II, Peter Schelkens; Touradj Ebrahimi; Gabriel Cristóbal; Frédéric Truchetet; Pasi Saarikko, Editors, 843616. ...

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Research paper thumbnail of Digital image quality measurements by objective and subjective methods from series of parametrically degraded images

8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 2013

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Digital image quality measurements by objective and subjective methods from series of parametrically degraded images

8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 2013

ABSTRACT Many digital image applications like digitization of cultural heritage for preservation ... more ABSTRACT Many digital image applications like digitization of cultural heritage for preservation purposes operate with compressed files in one or more image observing steps. For this kind of applications JPEG compression is one of the most widely used. Compression level, final file size and quality loss are parameters that must be managed optimally. Although this loss can be monitored by means of objective image quality measurements, the real challenge is to know how it can be related with the perceived image quality by observers. A pictorial image has been degraded by two different procedures. The first, applying different levels of low pass filtering by convolving the image with progressively broad Gauss kernels. The second, saving the original file to a series of JPEG compression levels. In both cases, the objective image quality measurement is done by analysis of the image power spectrum. In order to obtain a measure of the perceived image quality, both series of degraded images are displayed on a computer screen organized in random pairs. The observers are compelled to choose the best image of each pair. Finally, a ranking is established applying Thurstone scaling method. Results obtained by both measurements are compared between them and with other objective measurement method as the Slanted Edge Test.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of <title>Matching rendered and real world images by digital image processing</title>

Optics, Photonics, and Digital Technologies for Multimedia Applications, 2010

Recent advances in computer-generated images (CGI) have been used in commercial and industrial ph... more Recent advances in computer-generated images (CGI) have been used in commercial and industrial photography providing a broad scope in product advertising. Mixing real world images with those rendered from virtual space software shows a more or less visible mismatching between corresponding image quality performance. Rendered images are produced by software which quality performance is only limited by the resolution output.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of <title>LCD displays performance comparison by MTF measurement using the white noise stimulus method</title>

Image Quality and System Performance VIII, 2011

The amount of images produced to be viewed as soft copies on output displays are significantly in... more The amount of images produced to be viewed as soft copies on output displays are significantly increasing. This growing occurs at the expense of the images targeted to hard copy versions on paper or any other physical support. Even in the case of high quality hard copy production, people working in professional imaging uses different displays in selecting, editing, processing

Bookmarks Related papers MentionsView impact

Research paper thumbnail of IMAGE IMPROVEMENT IN PINHOLE DIGITAL PHOTOGRAPHY BY MEANS OF INVERSE AND WIENNER FILTERING

Bookmarks Related papers MentionsView impact

Research paper thumbnail of <title>Relationships between lens performance and different sensor sizes in professional photographic still SLR cameras</title>

Current Developments in Lens Design and Optical Engineering X, 2009

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Optimization of digitization procedures in cultural heritage preservation

8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 2013

ABSTRACT

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Measuring image quality performance on image versions saved with different file format and compression ratio

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Measuring image quality in overlapping areas of panoramic composed images

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Medida de la calidad de imagen en versiones guardadas con diferente formato de archivo y relación de compresión

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Calibrado de Estereotest Mediante Correlación de Imágenes Digitales (Poster)

Bookmarks Related papers MentionsView impact