High Dynamic Range Camera using Reflective Liquid Crystal

Mannami, Hidetoshi; Sagawa, Ryusuke; Mukaigawa, Yasuhiro; Echigo, Tomio; Yagi, Yasushi

doi:10.1109/iccv.2007.4408992

Cited by 21 publications

(17 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…8b and an HDR image derived from the existing method [6] in Fig. 8c. a b [6] Note that the existing method was implemented by using the same VET camera shown in Fig. 6a.…”

Section: Resultsmentioning

confidence: 99%

“…In order to obtain HDR images from a single image, new imaging methods were proposed recently [6][7][8]. In these methods, the image exposure is controlled pixel by pixel.…”

Section: Introductionmentioning

confidence: 99%

“…By *Correspondence: sakaue@nitech.ac.jp Department of Computer Science and Engineering, Nagoya Institute of Technology, Gokiso, Showa, Nagoya, 466-8555 Japan using this method, we can obtain appropriate images even if the dynamic range of input scenes is very large. In order to achieve it, Mannami et al [6] combined a liquid crystal on silicon (LCoS) device and an imaging sensor, in which each pixel of LCoS corresponds to each pixel of image sensor and exposure parameter of each pixel can be changed by controlling the transparency of LCoS pixels. Although this method is useful for obtaining HDR images, motion blur of input images cannot be suppressed completely when a dynamic scene has fast motion.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Variable exposure time imaging for obtaining unblurred HDR images

Uda

Sakaue

Sato

2016

IPSJ T Comput Vis Appl

View full text Add to dashboard Cite

In this paper, we propose a new camera and a new imaging technique for obtaining unblurred high-dynamic-range (HDR) images. In this camera, we achieve pixelwise control of exposure parameters by using a liquid crystal on silicon. In particular, we can control not only the amount of exposure but also the exposure time pixel by pixel. We call the imaging as variable exposure time imaging. By using the variable exposure time imaging, we can suppress motion blur of bright regions. In addition, we propose a motion blur recovering method from variable exposure time images for obtaining more distinct images including darker regions. Experimental results show our method can take a clear HDR image even if the target object moves in HDR scene.

show abstract

“…8b and an HDR image derived from the existing method [6] in Fig. 8c. a b [6] Note that the existing method was implemented by using the same VET camera shown in Fig. 6a.…”

Section: Resultsmentioning

confidence: 99%

“…In order to obtain HDR images from a single image, new imaging methods were proposed recently [6][7][8]. In these methods, the image exposure is controlled pixel by pixel.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Variable exposure time imaging for obtaining unblurred HDR images

Uda

Sakaue

Sato

2016

IPSJ T Comput Vis Appl

View full text Add to dashboard Cite

show abstract

“…In this paper, we propose to use a reflective liquid crystal on silicon (LCoS) device [19], which has much higher light efficiency and suffers less from diffraction. LCoS has been used before in computer vision for high dynamic range imaging [20]. Another similar device that could be used to modulate apertures is the digital micro-mirror device (DMD).…”

Section: Related Workmentioning

confidence: 99%

Programmable Aperture Camera Using LCoS

Nagahara

Zhou

Watanabe

et al. 2012

IPSJ Transactions on Computer Vision and Applications

View full text Add to dashboard Cite

Abstract. Since 1960s, aperture patterns have been studied extensively and a variety of coded apertures have been proposed for various applications, including extended depth of field, defocus deblurring, depth from defocus, light field acquisition, etc. Researches have shown that optimal aperture patterns can be quite different due to different applications, imaging conditions, or scene contents. In addition, many coded aperture techniques require aperture patterns to be temporally changed during capturing. As a result, it is often necessary to have a programmable aperture camera whose aperture pattern can be dynamically changed as needed in order to capture more useful information. In this paper, we propose a programmable aperture camera using a Liquid Crystal on Silicon (LCoS) device. This design affords a high brightness contrast and high resolution aperture with a relatively low light loss, and enables one change the pattern at a reasonably high frame rate. We build a prototype camera and evaluate its features and drawbacks comprehensively by experiments. We also demonstrate two coded aperture applications in light field acquisition and defocus deblurring.

show abstract

“…Optical attenuator based high dynamic range camera have increased size and has limitations in respect to scenes with very rapid motions [8]. In order to combat this problem, a technique of multiple iris based CCD system is being looked upon, which can alter the amount of light falling on the pixels depending upon the light intensity.…”

Section: Literature Surveymentioning

confidence: 99%

Template Matching to Enhance HUD Colour Images

Poddar¹,

Das²,

Karar³

2012

IJCA

View full text Add to dashboard Cite

Head up Display (HUD) is a means of presenting information to the pilot key flight instrument data onto a set of glasses regarded as "beam combiner" positioned just in front of the pilot"s line of sight looking ahead out of the aircraft helping him in key tasks like take off, navigation and landing. It also improves the situational awareness greatly by displaying flight, sensor and instrument data in the pilot"s forward field of view. HUD employs a CCD camera mounted right in front of the pilot, that is, between the beam combiner and the pilot for recording the view comprising of the outside world and the HUD symbology as seen by the pilot. This recorded video is sent directly through telemetry to the flight analysis ground station for real time flight data analysis as seen by the pilot as well as to guide the pilot. The recorded video is also used for post flight analysis as well as video source for HUD repeater display used by the pilot occupying rear cockpit seat in case of trainer aircrafts. The inconsistent and improper lighting conditions prevailing during weather conditions such as rain, snow, fog, bright sunny daylight and against the white clouds causes either insufficient or excessive light intensity at different spatial locations falling on the CCD camera sensor head resulting in degraded image quality with very low contrast. The work presented in this paper attempts to tackle this problem through theoretical study and experimental analysis. A customized template matching technique is also presented here for enhancement of the video captured by HUD camera. Added to this, hardware based methods are also suggested which can be employed for real time video enhancement.

show abstract

High Dynamic Range Camera using Reflective Liquid Crystal

Cited by 21 publications

References 10 publications

Variable exposure time imaging for obtaining unblurred HDR images

Variable exposure time imaging for obtaining unblurred HDR images

Programmable Aperture Camera Using LCoS

Template Matching to Enhance HUD Colour Images

Contact Info

Product

Resources

About