[photo] The Camera Menu Functions To Improve Picture Quality
Capt. Calvin Shum production center in Wuhan, Guangzhou China Office Assistant engineer equipment
Currently, many TV stations have basically completed the digital transformation of the equipment. As with the digital camera image acquisition, with its excellent performance and high image quality has been widely recognized, however, most photographers use the camera, the general environment will not be different according to the shooting, the camera’s menus appropriate settings, multi-state shooting at the factory set to a large extent limited the potential performance of the play to the camera. Especially in the outdoor light or indoor light uneven environment, the captured image in the level of performance, transparency and color saturation is not very satisfactory. To this end, we Panasonic AJ-D910 and the JVC camera DY-90 as an example, the camera menu on the adjustment to improve the image of the reduction.
Levels and improve the image brightness
1, blanking level settings Now digital cameras are increasingly high sensitivity, such as Panasonic AJ-D910 in 2000Lwx, 3200K reached F11. Meanwhile, as more emphasis on broadcast camera images under low illumination level of performance. Therefore, if according to the factory default menu settings to capture gray card, from the waveform monitor, the Department will find the dark signal level will be relatively high. So, if the light is very strong in the shooting environment, the signal is pushed up, feeling the bottom level, the performance comparison of subjective image signal ash, layering.
The AJ-D910 User Menu “ROP” sub-menu, “MASTERPED” adjustments are set to blanking level for the size, we can “MASTERPED” appropriate to reduce the main blanking level, the factory settings +2 when reduced to -10 or so, to reduce the shadow level, so black hair black instead of gray, black and white to enhance the image contrast. From the visual point of view, to improve the image of the level and clarity.
Parameter settings in the project, the original factory settings more numerical decline, mainly taking into account the back “GAMMA” gamma parameters adjusted level of image enhancement. Because the Department adjusted the brightness at the expense of the dark, so at night, low light theater scene, etc., do not allow the case of light hit, or use the factory default value of the project better. Or it can be increased through the appropriate camera gain to improve the image level, the proposed gain control in 6dB less than the best, otherwise the image to the noise will be relatively large.
JVC digital video camera DY-90 in the MAIN menu “MASTERBLACK” black base parameters of the function and Panasonic AJ-910 in the “MASTERPED” parameters the same. In addition to the menu addition, DY-90 while providing a dark part of the image transformation gain switch “BLACK” Black Extension / black compression switch, which has third gear “BLACKSTRETCH” to enhance the black parts of the gain to improve the contrast of black, usually darker in the image when use. “BLACKCOMPRESS” When the images are relatively light, a low contrast, you can compress the dark part of the gain to increase the image contrast. During use, the situation can be set according to the image “MASTERBLACK” parameter, which has 21 stalls changes from +10 ~ -10 step by step, the factory set to +4 can be reduced to -6 or so. The “BLACK” switches are used for some specific environment, the brighter the image when the switch on the “BLACKCOMPRESS”, the whole image darker, you can put “BLACK STRETCH”.
2, the main gamma adjustment (MASTER GAMMA)
TV and monitor, the CRT electron beam occurs and the resulting image brightness CRT with the input voltage is not linear. Compared with the input voltage electron flow is in accordance with the exponential curve, the input voltage is greater than the index index of the electron beam tubes. This shows that the tube on the images obtained showed dark areas darker signal than the actual situation, while the bright area of the signal will be more bright. Therefore, to reproduce the camera’s screen, TV and monitors must be the appropriate compensation, we called the gamma correction of such compensation. This gamma correction can only be achieved by the TV and monitor can also be accomplished by the camera. Our compensation for the entire television system gamma purpose is to make the camera tube according to the brightness of the incident light intensity and symmetry and a corresponding output signal, so should the image signal into a corresponding non-linear distortion, or with the TV system gamma Mary curve corresponds to the camera gamma curve, its value should be 1 / r, we call gamma camera. TV system gamma value of approximately 2.2, so the camera television system gamma value of 0.45 nonlinear compensation.
Gamma value of 2.8 the color picture tube, it’s the image signal correction index should be 1/2.8 = 0.35, but because of the impact of stray light tube inside and outside, to reproduce the image contrast and saturation decreased, so now color camera gamma value of 0.45 still use more. In practice, the actual situation we can be adjusted in a range of gamma values, in order to get the best picture results. As the gamma correction of color plays an important role reduction, gamma correction curve is a very complex non-linear curve, it requires very precise gamma correction. Now digital cameras are adjusted to provide full digital processing circuitry to accomplish this task.
Panasonic AJ-D910 to adjust the gamma curve can range from 0.35 ~ 0.75, with smaller values, the higher the curvature curve, the more value the greater curvature of straight curve. In the AJ-D910 of the “ROP” menu, “MASTERGAMMA” main factory set gamma value is set to “0.45.” Use the camera found in the background brightness of the same case, the relative level of people on the face dark. This will be “MASTERGAMMA” value to 0.42, and make the appropriate color level to improve, to improve the image of the color effects. Taking into account the lower part of the attendant increase in level, we can first of a “MASTERPED” have been duly compensated.
Main gamma adjustment Camera in JVC DY-90 in the gamma value in the pre-menu “GAMMA” set, GAMMA parameter adjustment range from +7 to -7 total of 18 stalls, in view of the above mentioned reasons, may be the is reduced 1 to 2 files.
Blanking level and gamma adjustment as the two parameters on the image brightness level have great impact, it is recommended in actual use, according to Sunny, Cloudy, Indoor, Night Portrait, studio, etc. in different environments , combined with style of the program to adjust accordingly.
Improve the image of the soft degrees
All cameras use image enhancement technology
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