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    • 4. 发明授权
    • Contour mitigation using parallel blue noise dithering system
    • 使用平行蓝噪声抖动系统的轮廓减轻
    • US06774916B2
    • 2004-08-10
    • US09795403
    • 2001-02-26
    • Gregory S. PettittBradley W. WalkerMatthew John Fritz
    • Gregory S. PettittBradley W. WalkerMatthew John Fritz
    • G09G334
    • G09G3/2022G09G3/20G09G3/2051G09G3/346
    • A method and system for displaying fractional bit data in order to increase the bit depth of a PWM display without requiring the use of an excessive number of bit planes. One embodiment of the present invention combines the outputs of two random number generators (702) with the outputs of a row counter (704) and column counter (706) to yield row and column indexes into two 32×32 cell blue noise masks. The row and column indexes select a blue noise mask threshold for a given pixel. The threshold from the first blue noise mask (708) is applied to a comparator (710) where it is compared to the fractional bit portion of the pixel data. A first blue noise bit, BN(1), is generated based on this comparison. Typically, BN(1) is a “1” when the fractional portion of the pixel data exceeds the threshold value from the mask. The same threshold data is also processed by inverter (712) to produce the threshold that would be shored in an inverted form of Mask A. Inverter (712) prevents the circuitry from having to store four separate blue noise masks. The output of the inverter (712) is also compared to the fractional pixel data to produce a second blue noise bit, BN(2). In the same manner, the second blue noise mask (714) is used to generate two additional blue noise bits. The four blue noise bits are then used alternately in the quad-frame display of FIG. 5 with the integer portion of the pixel data.
    • 一种用于显示分数位数据的方法和系统,以便增加PWM显示的位深度,而不需要使用过多数量的位平面。 本发明的一个实施例将两个随机数发生器(702)的输出与行计数器(704)和列计数器(706)的输出组合,以将行和列索引合并成两个32×32单元蓝噪声掩码。 行和列索引为给定像素选择蓝色噪声屏蔽阈值。 来自第一蓝色噪声掩码(708)的阈值被施加到比较器(710),在比较器(710)中将其与像素数据的分数位部分进行比较。 基于该比较生成第一蓝噪声比特(BN)(1)。 通常,当像素数据的分数部分从掩模超过阈值时,BN(1)为“1”。 相同的阈值数据也由逆变器(712)处理,以产生将以掩模A的反向形式被触发的阈值。逆变器(712)防止电路必须存储四个分开的蓝色噪声掩模。 反相器(712)的输出也与分数像素数据进行比较,以产生第二蓝色噪声比特(BN)(2)。 以相同的方式,第二蓝色噪声掩码(714)用于产生两个附加的蓝色噪声比特。 然后四个蓝色噪声比特在图4的四帧显示中交替使用。 5与像素数据的整数部分。
    • 6. 发明授权
    • Enhanced color correction
    • 增强色彩校正
    • US06594387B1
    • 2003-07-15
    • US09561160
    • 2000-04-28
    • Gregory S. PettittBradley W. Walker
    • Gregory S. PettittBradley W. Walker
    • G06K900
    • H04N1/60H04N1/6016H04N9/68
    • A method and apparatus for correcting the color of an image signal. Data in a first color space such as RGB is converted (502) to primary/secondary/neutral color space by setting neutral color word equal to the minimum of the input values, the primary color word equal to the maximum of the input values minus the neutral color word, and the secondary color word equal to the median of the input values minus the neutral color word. A set of three coefficients is selected (506) for each of the primary color word, the secondary color word, and the neutral color word. The primary, secondary, and neutral color words are then multiplied by the coefficients by a matrix multiplier (504) to yield color-corrected data in the first color space.
    • 一种用于校正图像信号的颜色的方法和装置。 将诸如RGB的第一颜色空间中的数据通过设置等于输入值的最小值的中性色彩字来转换(502)到主/次/中性色空间,原色字等于输入值的最大值减去 中性色彩字,次要色字等于输入值的中值减去中性色彩字。 对于原色字,次色字和中性色字中的每一个选择一组三个系数(506)。 然后,通过矩阵乘法器(504)将主要,次要和中性色彩字乘以系数,以产生第一颜色空间中的色彩校正数据。