Abstract: A light field display apparatus and a method for calibrating a display image thereof are provided. The method for calibrating a display image includes: dividing a display image to generate a plurality of block images; displaying the block images by a display, and passing the block images through a light field device to generate a combination image; providing an image capturer to capture the combination image, and comparing the display image and the combination image to generate error information; receiving user parameters; and adjusting at least one of the block images in the display image according to the user parameters and the error information. Without providing a mechanical adjustment device, the light field display apparatus of the invention can compensate for display errors that may be caused by the device-internal parameters and the user parameters, which not only enhances display quality, but also enhances convenience in use.

Abstract: An image processing method adapted to be executed by an image capturing apparatus. The image capturing apparatus comprises a processing circuit and a light field camera. The image processing method includes: obtaining by using the light field camera a first image and a second image each including a plurality of sub-regions; performing a local brightness redistribution process on at least one of the sub-regions of the second image according to a brightness distribution of at least one of the sub-regions of the first image; performing an image rendering process on the first image and the second image to obtain a third image; and performing a global brightness redistribution process on the third image to obtain a fourth image.

Abstract: The invention discloses a near-eye display device including a display panel, a liquid crystal layer, and a lens element. The display panel is configured to provide an image light beam. The liquid crystal layer is disposed adjacent to the display panel, and the image light beam passes through the liquid crystal layer. The liquid crystal layer is disposed between the display panel and the lens element. Phase modulation occurs to at least a portion of the liquid crystal layer to modulate the image light beam.

Abstract: A projection apparatus, adapted to project a virtual image to a projection target, and comprising a light source module, a light modulator, an optical lens and an optical film is provided. The light source module provides a light beam. The light modulator adjusts a transmission direction of the light beam. The light modulator modulates the light beam according to an input signal to generate the virtual image. The optical lens has a front view direction on a reference plane. The projection target receives an environment beam in the front view direction to form an environment image. The optical film projects the virtual image to the projection target along a projection direction. The front view direction and the projection direction have an included angle on the reference plane. Moreover, an image projection method is also provided.

Abstract: An image processing method adapted to be executed by an image capturing apparatus. The image capturing apparatus comprises a processing circuit and a light field camera. The image processing method includes: obtaining by using the light field camera a first image and a second image each including a plurality of sub-regions; performing a local brightness redistribution process on at least one of the sub-regions of the second image according to a brightness distribution of at least one of the sub-regions of the first image; performing an image rendering process on the first image and the second image to obtain a third image; and performing a global brightness redistribution process on the third image to obtain a fourth image.

Abstract: An image capturing device adapted to capture a plurality of images of an object and an image capturing method are provided. The image capturing device includes an image sensing element, a first lens element, a second lens element and a variable focal length lens element. The image sensing element includes a plurality of image sensing pixels. The first lens element focuses a beam coming from the object to a focus position in a range of depth of focus. The variable focal length lens element is disposed between the first lens element and the second lens element or inside the first lens element, and is configured to adjust a focus object distance of the image capturing device. The beam has an image width on an image plane of the range of depth of focus. The image width is smaller than a first pixel width.

Abstract: An image pickup device including an imaging lens, an image sensor, and a multiple aperture optical element is provided. The multiple aperture optical element is disposed on a light path between the imaging lens and the image sensor, and includes aperture elements arranged in an array. A ratio of an image side f-number of the imaging lens to an object side f-number of the imaging lens is within a range of 0.25 to 2. A light field image pickup lens is also provided.

Abstract: An image pickup device including an imaging lens, an image sensor, and a multiple aperture optical element is provided. The multiple aperture optical element is disposed on a light path between the imaging lens and the image sensor, and includes aperture elements arranged in an array. The image pickup device satisfies: 0.7 ? L < D × b P - a < 1.06 ? L , where L is a pitch of the aperture elements, D is a diameter of an exit pupil of the imaging lens, P is a distance between the exit pupil of the imaging lens and an image plane of the imaging lens, a is a distance value from the image plane of the imaging lens to a front principal plane of the multiple aperture optical element, and b is a distance between a back principal plane of the multiple aperture optical element and the image plane of the image sensor. A light field image pickup lens is also provided.

Abstract: A method and a system for measuring a distance from a reference point to an object are provided. The method comprises the following steps. At least one image of an object is captured through a lens comprising a phase mask composed of a parallel plate and a wedge prism. At least two corresponding regions of interest (ROI) are obtained from the images. The regions of interest correspond to identical portions of the object. The relative coordinates between corresponding locations within the corresponding regions of interest is measured. The distance is calculated according to the relative coordinates.

Abstract: A ranging apparatus including an image sensor, an imaging lens, and a processor is provided. The imaging lens is configured to image an object on the image sensor to produce an image signal having at least one image parameter, wherein the at least one image parameter changes with a change of an object distance of the object. The processor is configured to determine the change of the object distance according to a change of the at least one image parameter. A ranging method and an interactive display system are also provided.

Abstract: A method and a system for measuring a distance from a reference point to an object are provided. The method comprises the following steps. At least one image of an object is captured through a lens comprising a phase mask composed of a parallel plate and a wedge prism. At least two corresponding regions of interest (ROI) are obtained from the images. The regions of interest correspond to identical portions of the object. The relative coordinates between corresponding locations within the corresponding regions of interest is measured. The distance is calculated according to the relative coordinates.

Abstract: An image refocusing method for use in an image processing apparatus is provided. The image processing apparatus has an image capturing unit and an image processing unit. The method has the following steps of: receiving lights of a scene via the image capturing unit to output a raw image having information of different views; rearranging the raw image from the image sensor to obtain multiple different view sub-images; performing a refocusing process to at least one specific view sub-image of the different view sub-images corresponding to a specific view to generate multiple refocused view images, wherein a first focusing position of the refocused view images is different from a second focusing position of the at least one specific view sub-image; and outputting the refocused view images to a stereoscopic display device.

Abstract: An ultrasound imaging system and methods thereof are provided. A method includes transmitting a plurality of energy signals coded by a first asymmetric phase element toward an object to be imaged, receiving a plurality of echo signals from the object to be imaged, respectively coding the received signals with a second asymmetric phase element, and reconstructing an image data set with an extended depth of field by decoding the received signals. The ultrasound imaging system includes a transmitter transmitting energy signals coded by a first asymmetric phase element toward an object to be imaged, and a receiver receiving echo signals from the object to be imaged, respectively coding the received signals with a second asymmetric phase element, and reconstructing an image data set with an extended depth of field by decoding the received signals.

Abstract: A method and optical apparatus are utilized not only to increase the degree of the similarity of the point spread functions of different fields of view, but also to maintain the degree of the difference of point spread functions which are along the optical axis of the optical apparatus. Using the degree of the difference of on-axis point spread functions, the depth information of scenery can be extracted.

Abstract: An optical interference apparatus of detecting an object is provided. The optical interference apparatus includes a light source capable of emitting a light beam, an optical coupler, a reflector, a first lens set and a light sensing unit. The optical coupler is capable of dividing the light beam into a measuring sub-light beam and a reference sub-light beam. The reflector reflects the reference sub-light beam. The first lens set includes a first lens. The measuring sub-light beam is transmitted to the object. The object reflects or scatters a part of the measuring sub-light beam back to the first lens. The first lens is capable of extending a depth of field of the first lens set. The light sensing unit is adapted to detect an interference signal formed by the reference sub-light beam and the measuring sub-light beam.

Abstract: A method and an apparatus for designing an image restoration filter and a method and an apparatus for restoring an image by using the image restoration filter are provided. A test image is captured by an imaging system to obtain image information of the test image. The image restoration filter is then calculated according to original image information of the test image and the image information obtained by the imaging system through a numerical method, such that the obtained image information after being processed by the image restoration filter has a better similarity to the original image information. Thereafter, an image captured by the imaging system is processed by using the image restoration filter as a kernel, so as to resolve the problems of image blur and distortion caused by the optical path and the imaging system.

Abstract: An apparatus for evaluating a volume of an object and a method thereof are provided. The provided apparatus and the method can precisely evaluate the volume of the object with a single camera, and the required evaluation time is short. Accordingly, shipping companies can utilize the most appropriate container or cargo space for each object to deliver, thereby reducing operation costs and optimizing the transportation fleet.

Abstract: A projection system comprises an image input element and an optical imaging element. The image input element is configured to input an original image or a processed image. The optical imaging element, an optical system with axisymmetrical structure and specific spherical aberration, is configured to generate an image with extended depth of field on an image projection surface in accordance with the original image or the processed image.

Abstract: A distance evaluation method for evaluating distances from an observation point to objects within an arbitrary detectable range in a scene is disclosed. The method includes the following steps. First, a focus distance is set to correspond to a lower or higher limit of a chosen detection range. Next, an image is then captured with an image acquisition system, wherein transfer function of the image acquisition system depends on the focus distance. The captured image of the scene is segmented. A blur metric is computed for each image segment of the captured image. The blur metric is associated with the distance of the objects from the observation point in each image segment.

Abstract: A barcode reading apparatus adapted to detect a barcode is provided. The barcode reading apparatus includes an imaging lens, an image sensor, and a barcode decoder. The imaging lens has a spherical aberration to extend a depth of field of the imaging lens. The imaging lens is configured to image the barcode onto the image sensor. The image sensor converts an image of the barcode into a barcode signal. The barcode decoder is configured to decode the barcode signal to obtain information represented by the barcode. A barcode reading method is also provided.