IDW 07 Correlation Analysis between Motion Blur Widths and Human Perception Keita Hirai, Norimichi Tsumura, Toshiya Nakaguchi and Yoichi Miyake Abstra

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1 IDW 07 Correlation Analysis between Motion Blur Widths and Human Perception Keita Hirai, Norimichi Tsumura, Toshiya Nakaguchi and Yoichi Miyake Abstract We examined the validity of perceived blur edge width (PBEW by analyzing the correlation between observer rating values and physical properties that were extended blur edge width (EBEW and PBEW. We also examined the correlation with changing contrast sensitivity function (CSF models in the calculation of PBEW. In our results, PBEW correlated more with the observer s rating values than EBEW. It was also shown that Spatio-Velocity CSF model is significant for calculating PBEW. Extended Blur Edge Width Perceived Blur Edge Width 1. (CRT (LCD (PDP (FPD LCD CRT?? LCD???? Moving Picture Response Time(MPRT??? MPRT VESA(Video Electronics Standard Association? LCD IDW TEL TEL Graduate School of Advanced Integrated Science, Chiba University (1-33, Yayoi-cho, Inage-ku, Chiba , Japan Research Center for Frontier Medical Engineering, Chiba University (1-33, Yayoi-cho, Inage-ku, Chiba , Japan? MTF (Modulation Transfer Function (Contrast Sensitivity Function CSF?? Oka MPRT CSF Perceived Blur Edge Width(PBEW?? PBEW MPRT Extended Blur Edge Width (EBEW PBEW EBEW PBEW PBEW EBEW PBEW PBEW PBEW Vol. xx, No. xx, pp. 1? (20xx ( 1 1

2 PBEW CSF PBEW 2. EBEW PBEW 2. 1 MPRT EBEW MPRT CCD ( 1 Final Gray Y6 Y5 Y4 Y3 Y2 Y1 Y0 CCD 1 MPRT Overview of MPRT measurement method. Y6 Initial Gray Y5 Y4 Y3 Y2 Y1 2 MPRT Combination of gray levels for measurement patterns. Y0 MPRT 7 42 ( 2 Initial Gray Final Gray Y n Y 6 Y 0 (1 L0=903.3 Y 0/Y 6 for Y 0/Y 6 < = ( 3 (L0 + (100 L0 n/ Y n =Y n {0, 1, 2, 3, 4, 5, 6} (1 ( 3 Initial Gray Final Gray 10% 90% 2 x i x f (2 EBEW EBEW= x f x i (2 v p [pixels/frame] 1 t f [msec/frame] (3 EBEW EBET MPRT 42 EBET EBET=EBEW tf v p ( EBEW PBEW EBEW 10%-90% LCD EBEW ( 4 EBEW? EBEW 90% 90% 10% x i x f 10% x ( 3 EBEW Definition of EBEW. ( 4 EBEW Example of same EBEW values in different luminance profiles. 2 ( 2 Vol. xx, No. xx (20xx

3 FFT PBEW IFFT CSF ( 5 PBEW Calculation of PBEW. Oka (CSF PBEW?? PBEW 5 PBEW EBEW CSF PBEW 3. Perceived Blur Edge Width PBEW EBEW PBEW EBEW PBEW PBEW 3. 2 Sano MPRT? 7 CCD SONY DFW-X710MITSUBISHI MELFA mm CCD EBEW PBEW EBEW PBEW EBEW 5-95% 10-90% 15-85% 20-80% 25-75% 5 PBEW EBEW PBEW 10% 90% 8 PBEW 0-100% ( 5-95% 10-90% EBEW CCD MPRT CSF filter PBEW 6 Schematic diagram of our experiment. 7 ( Pursuit camera system developed for measuring MPRT (The measurement was done in a dark room. ( 3 3

4 PBEW 90% Contrast Sensitivity 10% ( 8 PBEW Calculation of PBEW using threshold set. 9 Spatial Frequency (cpd Barten CSF Barten s CSF model. 3 PBEW PBEW Oka? Barten? CSF PBEW Berten CSF Spatio-Velocity CSF? ( CSFBarten CSFHirai 9 10 PBEW CSFBarten CSFHirai 9 CSFBarten 5[cyc/deg] Spatio-Velocity CSF [deg/sec] CSFHirai ( 10(a CSFBarten 5[cyc/deg] 12.5[deg/sec] CSFHirai ( 10(b PBEW ( [cpd/sec] CSFBarten 11 EBEW PBEW EBEW=5.6 PBEW(CSFBarten=8.3 PBEW(CSFHirai=19.4( [pixels] CSFHirai CSFBarten 11(c CSFBarten CSFHirai ?? Contrast Sensitivity Contrast Sensitivity Spatial Frequency (cpd (a Spatial Frequency (cpd (b Velocity (dps (aspatio-velocity CSF (bvelocity=12.5deg/sec Spatio-Velocity CSF (aspatio-velocity CSF model, (bsectional view of Spatio-Velocity CSF model at velocity=12.5deg/sec. ( EBEW PBEW PBEW LCD n (x i x(y i ȳ i=1 = n i=1 (xi x2 ( n i=1 (yi ȳ2 (4 x i y i x ȳ x = (x 1,, x n y = (y 1,, y n 4 ( 4 Vol. xx, No. xx (20xx

5 LCD LCD( (a 12 (a LCD( (b ( ( (a (b Subjective experimental setup(the experiments were done in a dark room. (adifferent test patterns displayed on an LCD, (bsame test patterns displayed on an LCD pair. (b PBEW (CSF( CSF Hirai [mm] 10 [pixels/frame] (12.5[deg/sec] LCD 200[cd/m 2 ] PBEW (CSF( CSF Barten (c EBEW PBEW (a (b (c CSF Example of Profiles (acaptured Image, (bluminance profile obtained from captured image (cprofiles obtained from CSF-filtered luminance profile. 2.1 Y 0 Y 2 Y 4 Y 6 Initial Gray Final Gray 12 66( 12 C LCD( LCD1-1 LCD LCD 10 Y 0 Y 2 Y 4 Y 6 Initial Gray Final Gray EBEW( 10-90% PBEW( 0-100% ( 0( 100( EBEW LCD % LCD % 2.2 EBEW (10-90% PBEW 0-100%( PBEW Oka 0-100% LCD1-1 PBEW EBEW LCD1-2 EBEW( 20-80% ( 5 5

6 1 LCD1-1 Correlation coefficients between blur edge widths and observer rating values with LCD1-1. (aebew 5-95% 10-90% 15-85% 20-80% 25-75% (bpbew(csfbarten 0-100% 5-95% 10-90% (bpbew(csfhirai 0-100% 5-95% 10-90% LCD1-2 Correlation coefficients between blur edge widths and observer rating values with LCD1-2. (aebew 5-95% 10-90% 15-85% 20-80% 25-75% (bpbew(csfbarten 0-100% 5-95% 10-90% (bpbew(csfhirai 0-100% 5-95% 10-90% EBEW ( 10-90% PBEW( 0-100% EBEW 0-100% PBEW PBEW CSF LCD1-1 LCD1-2 CSFBarten CSFHirai PBEW PBEW(CSFHirai PBEW(CSFBarten 3 ( Final Gray-Initial Gray Correlation coefficients with five LCDs. Edge pattern : Final Gray-Initial Gray. (aebew EBEW PBEW(CSFBarten PBEW(CSFHirai Y 0-Y Y 0-Y Y 0-Y Y 2-Y Y 2-Y Y 4-Y Y 2-Y Y 4-Y Y 6-Y Y 4-Y Y 6-Y Y 6-Y ( 0.8 Results of correlation coefficients over 0.8 in table. 3. EBEW PBEW(CSFBarten PBEW(CSFHirai Y 0-Y Y 2-Y Y 6-Y Y 6-Y EBEW PBEW (CSF Hirai PBEW (CSF Barten LCD1-1 EBEW( 10-90% PBEW( 0-100% Relationship between edge blur widths and observer rating values with LCD PBEW (CSF Hirai EBEW PBEW (CSF Barten LCD1-2 EBEW( 10-90% PBEW( 0-100% Relationship between edge blur widths and observer rating values with LCD EBEW 10-90% PBEW 0-100% 15 Y0-Y4(Final Gray-Initial Gray EBEW PBEW 6 ( 6 Vol. xx, No. xx (20xx

7 PBEW (CSF Hirai PBEW (CSF Barten EBEW 15 Y0-Y4(Final Gray-Initial Gray ( 10-90% PBEW( 0-100% Relationship between edge blur widths and observer rating values with five LCDs(Final Gray-Initial Gray :Y0- Y4. ( 3 EBEW PBEW(CSFBarten PBEW(CSFHirai EBEW PBEW(CSFBarten EBEW PBEW CSF PBEW Barten Spatio-Velocity CSF PBEW 5. EBEW PBEW EBEW PBEW PBEW 0-100%( PBEW CSF Barten Spatio-Velocity CSF PBEW EBEW PBEW MPRT PBEW MPRT PBEW PBEW 1 T. Kurita, A. Saito, and I. Yuyama: Consideration on Perceived MTF of Hold Type Display for Moving Images, Proc. of IDW 98, pp ( J Miseli: Motion artifacts, SID Symposium Digest of Technical Papers, 35, 1, pp.86-89( M. A. Klompenhouwer: Comparison of LCD Motion Blur Reduction Methods using Temporal Impulse Response and MPRT, SID Symposium Digest of Technical Papers, 37, 1, pp ( T. W. Su, J. J. Su, T. J. Chang, P. L. Chen, K. Y. Lin, and C. T. Liu: Moving-image simulation for high-quality LCD TVs, J. Soc. Inf. Display, 15, 1, pp.71-78( M. Baba, G. Itoh, and H. Okumura: Software-processed edgeand level-adaptive overdrive (SELAO method for high-quality motion pictures, J. Soc. Inf. Display, 15, 3, pp ( J. Someya and N. Okuda : Motion adaptive CODEC Feedforward Driving for LCD overdrives, J. Soc. Inf. Display, 13, 6, pp ( K. Oka, and Y. Enami: Moving Picture Response Time (MPRT Measurement System, SID Symposium Digest of Technical Papers, 35, 1, pp ( Y. Igarashi, T. Yamamoto, Y. Tanaka, J. Someya, Y. Nakakura, M. Yamakawa, Y. Nishida, and T. Kurita: Summary of Moving Picture Response Time (MPRT and Futures, SID Symposium Digest of Technical Papers, 35, 1, pp ( I. Kawahara, M. Kasahara, and T. Shinoda: Measurement and Evaluation of Moving Picture Resolution: From Milliseconds to TV-Lines, Proc. of IDW 07, pp ( VESA FPDM2: Video Electronics Standards Association, Flat Panel Display Measurements Standard, Version 2.0, May( J. Someya, and H. Sugiura: Evaluation of liquid-crystal-display motion blur with moving-picture response time and human perception, J. Soc. Inf. Display, 15, 1, pp.79-86( :, ( :,, 62, 3, pp ( K. Oka, and Y. Enami: Image Quality Degradation of Moving Pictures: Perceived blur edge width, Proc. of IDW 05, pp ( K. Oka, Y. Enami, J. Lee, and T. Jun: Edge Blur Width Analysis Using a Contrast Sensitivity Function, SID Symposium Digest of Technical Papers, 37, 1, pp.10-13( S. Sano, T. Nakaguchi, N. Tsumura, and Y. Miyake: Measuring motion blur of displays for the motions on various direction, The Second International Workshop on Image Media Quality and its Applications, pp ( P. G. J. Barten: Formula for the contrast sensitivity of the human eye, Proc. of SPIE/IS&T Electronic Imaging, 5294, pp ( K. Hirai, N. Tsumura, T. Nakaguchi, and Y. Miyake: Measurement and Modeling of Viewing-Condition- Dependent Spatio- Velocity Contrast Sensitivity Function, Proc. of IS&T/SID 15th Color Imaging Conference, pp ( L. L. Thurstone: The Measurement of Values, Univ. of Chicago Press( :,, pp.48-64(1982 ( 7 7

8 ( ( 8 Vol. xx, No. xx (20xx

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