Συνεχίζω εδω μια ωραια κουβέντα που ειχαμε αρχίσει στο AvForum.
Με την ελευση των νεων 1080 προβολέων οι οποίοι εχουν διπλάσια ποσότητα πιξελ απο τους προβολείς 720 (1920Χ1080=2,073,600 pixels εναντι 1280Χ720=921,600 pixels ) άραγε παιρνουμε την διπλασια ανάλυση?
Για να δουμε καταρχην εναν ορισμο της αναλυσης απο το widescreen review:
Επισης, απο το Widescreen Review, οι ακολουθοι ορισμοι της Αναλυσης:
Resolution
The density of lines or dots for a given area that make up an image. Resolution determines the detail and quality in the image. A measure of the ability of a camera or video system to reproduce detail. A measure of the amount of detail that can be seen in an image. Often incorrectly expressed as a number of pixels (picture elements); more correctly it is the bandwidth. We say that a sharp, clear picture has high resolution.
The fineness of detail that can be distinguished in an image, as on a video display. 1) Horizontal. The amount of detail in a horizontal direction in a video image. It is expressed as the number of distinct vertical lines, alternately black and white, that can be seen in the width of the picture. This information is usually derived from observation of the vertical wedge of the test pattern. Horizontal resolution depends on the high-frequency amplitude and phase response of the pick-up equipment, as well as the transmission medium and the monitor itself. 2) Vertical. The amount of resolvable detail in a vertical direction in a video image. It is expressed as the number of distinct horizontal lines, alternately black and white, that can be seen in a test pattern. Vertical resolution is primarily fixed by the number of horizontal scanning lines in a frame.
Ας διαβασουμε τι λεει και ο γνωστος Greg Rogers επι του θεματος:
"Resolution is a measure of the ability to differentiate spatial detail in images. But I normally try not to use the term resolution when describing image quality because it seems to confuse some people. Thanks to the computer industry, some people see the term resolution and immediately equate that to the native pixel format of the display. They seem to think that all 1920 x 1080 pixel displays have the same image resolution. But if resolution specifies the ability to perceive detail, then fixed-pixel or CRT projectors that display the same pixel format (i.e. 1920 x 1080 pixels) will likely have different resolutions. To make this more clear ... the resolution of two CRT projectors will likely be different, even if both projectors produce the same size images, using the same (1080p) scan rates. The resolution of two fixed-pixel projectors will likely be different, even though both have 1920 x 1080 pixel imaging devices.
The ability to perceive detail (resolution) gradually decreases as the size of the detail (increasing horizontal or vertical spatial frequency) is reduced. Therefore, we can best describe the ability to perceive spatial detail with a modulation transfer function (MTF), which measures contrast as spatial frequency is increased (rather like reducing the separation between a series of alternating black and white lines). The shape of the MTF curve (contrast vs frequency) is very different for CRT projectors than fixed-pixel projectors, because it usually depends more on CRT spot size and shape than lens quality. The MTF curve for fixed-pixel projectors is more dependent on lens quality and is ultimately limited by the native pixel format of the projector. The same physical factors that determine sharpness also determine resolution, but the perception of sharpness is mostly a function of the shape of the MTF curve, while resolution is normally defined as the frequency at which the contrast falls to some arbitrary level. For instance, the MTF curve for a CRT projector may start to fall off at a lower frequency but extend to a higher frequency than a fixed-pixel projector. As a consequence, the CRT projector may produce a higher ultimate resolution (finer detail) while producing less sharpness than fixed-pixel projector. In addition, larger detail may be much more visible on the fixed-pixel projector than the CRT projector because the slope of the MTF curves are very different. The same type of effects can occur between different fixed-pixel projectors because their MTF curves also vary depending on their optics and imaging devices."
Ποια ειναι η αποψή σας?
Με την ελευση των νεων 1080 προβολέων οι οποίοι εχουν διπλάσια ποσότητα πιξελ απο τους προβολείς 720 (1920Χ1080=2,073,600 pixels εναντι 1280Χ720=921,600 pixels ) άραγε παιρνουμε την διπλασια ανάλυση?
Για να δουμε καταρχην εναν ορισμο της αναλυσης απο το widescreen review:
Επισης, απο το Widescreen Review, οι ακολουθοι ορισμοι της Αναλυσης:
Resolution
The density of lines or dots for a given area that make up an image. Resolution determines the detail and quality in the image. A measure of the ability of a camera or video system to reproduce detail. A measure of the amount of detail that can be seen in an image. Often incorrectly expressed as a number of pixels (picture elements); more correctly it is the bandwidth. We say that a sharp, clear picture has high resolution.
The fineness of detail that can be distinguished in an image, as on a video display. 1) Horizontal. The amount of detail in a horizontal direction in a video image. It is expressed as the number of distinct vertical lines, alternately black and white, that can be seen in the width of the picture. This information is usually derived from observation of the vertical wedge of the test pattern. Horizontal resolution depends on the high-frequency amplitude and phase response of the pick-up equipment, as well as the transmission medium and the monitor itself. 2) Vertical. The amount of resolvable detail in a vertical direction in a video image. It is expressed as the number of distinct horizontal lines, alternately black and white, that can be seen in a test pattern. Vertical resolution is primarily fixed by the number of horizontal scanning lines in a frame.
Ας διαβασουμε τι λεει και ο γνωστος Greg Rogers επι του θεματος:
"Resolution is a measure of the ability to differentiate spatial detail in images. But I normally try not to use the term resolution when describing image quality because it seems to confuse some people. Thanks to the computer industry, some people see the term resolution and immediately equate that to the native pixel format of the display. They seem to think that all 1920 x 1080 pixel displays have the same image resolution. But if resolution specifies the ability to perceive detail, then fixed-pixel or CRT projectors that display the same pixel format (i.e. 1920 x 1080 pixels) will likely have different resolutions. To make this more clear ... the resolution of two CRT projectors will likely be different, even if both projectors produce the same size images, using the same (1080p) scan rates. The resolution of two fixed-pixel projectors will likely be different, even though both have 1920 x 1080 pixel imaging devices.
The ability to perceive detail (resolution) gradually decreases as the size of the detail (increasing horizontal or vertical spatial frequency) is reduced. Therefore, we can best describe the ability to perceive spatial detail with a modulation transfer function (MTF), which measures contrast as spatial frequency is increased (rather like reducing the separation between a series of alternating black and white lines). The shape of the MTF curve (contrast vs frequency) is very different for CRT projectors than fixed-pixel projectors, because it usually depends more on CRT spot size and shape than lens quality. The MTF curve for fixed-pixel projectors is more dependent on lens quality and is ultimately limited by the native pixel format of the projector. The same physical factors that determine sharpness also determine resolution, but the perception of sharpness is mostly a function of the shape of the MTF curve, while resolution is normally defined as the frequency at which the contrast falls to some arbitrary level. For instance, the MTF curve for a CRT projector may start to fall off at a lower frequency but extend to a higher frequency than a fixed-pixel projector. As a consequence, the CRT projector may produce a higher ultimate resolution (finer detail) while producing less sharpness than fixed-pixel projector. In addition, larger detail may be much more visible on the fixed-pixel projector than the CRT projector because the slope of the MTF curves are very different. The same type of effects can occur between different fixed-pixel projectors because their MTF curves also vary depending on their optics and imaging devices."
Ποια ειναι η αποψή σας?