<span class="Apple-style-span" style="font-size: 13px; "><div style="border-collapse: collapse; font-family: arial, sans-serif; ">Hi, all</div><div style="border-collapse: collapse; font-family: arial, sans-serif; "><br></div>
<div style="border-collapse: collapse; font-family: arial, sans-serif; ">I am working on astronomical image processing plug-in for Opticks.</div><div style="border-collapse: collapse; font-family: arial, sans-serif; "><br>
</div><div style="border-collapse: collapse; font-family: arial, sans-serif; ">This week I <span class="Apple-style-span" style="font-family: Helvetica, Arial, sans-serif; line-height: 17px; border-collapse: separate; ">finish the implementation of Gaussian histogram shaping function for image enhancement.</span></div>
<div style="border-collapse: collapse; font-family: arial, sans-serif; "><br></div><div style="border-collapse: collapse; font-family: arial, sans-serif; "><span class="Apple-style-span" style="font-family: Helvetica, Arial, sans-serif; line-height: 17px; border-collapse: separate; "><p style="font-size: 10pt; line-height: 13pt; color: rgb(0, 0, 0); font-weight: normal; margin-top: 10px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">
I modify the original code to set the maximum gray scale value according to the image encoding type. And I add the function to calculate the peak value (the peak of Gaussian function) according to the histogram of the image. The gray scale value that has the most number of pixels is considered the peak of Gaussian function. Also I fixed some bugs in array index of the original code</p>
</span><span class="Apple-style-span" style="font-family: Helvetica, Arial, sans-serif; line-height: 17px; border-collapse: separate; ">I add a dialog for user to modify the peak value and sigma spread that are the basic parameters of the Gaussian function. The user can modify the peak value so as to change the gray scale value of the entire image. For example, increase the peak value usually let the background of the deep sky becomes brighter. The user can also modify the sigma spread value. The larger the value, the smother the histogram function which means the contrast of the objects and the background would becomes larger.</span> </div>
<div style="border-collapse: collapse; font-family: arial, sans-serif; "><span lang="EN-US" style="font-size: 10pt; font-family: Helvetica; color: black; "><br></span></div><div style="border-collapse: collapse; font-family: arial, sans-serif; ">
The details of the report can be found at: <span class="Apple-style-span" style="font-family: arial; font-size: small; border-collapse: separate; "><a href="http://opticks.org/confluence/display/~yiwei/Status+Report+for+Week+4%2C+GSoC+2011">http://opticks.org/confluence/display/~yiwei/Status+Report+for+Week+4%2C+GSoC+2011</a></span></div>
<div style="border-collapse: collapse; font-family: arial, sans-serif; "><br></div><div style="border-collapse: collapse; font-family: arial, sans-serif; ">Next week I will b<span class="Apple-style-span" style="font-family: Helvetica, Arial, sans-serif; line-height: 17px; border-collapse: separate; ">egin to implement the local adaptive sharpening method for image enhancement</span></div>
</span>